layui实现（学生）数据的增删改查-Toy模板网

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创建的数据库/表:

layui实现（学生）数据的增删改查

运行效果展示：

查询

layui实现（学生）数据的增删改查

添加：

点击添加按钮：
layui实现（学生）数据的增删改查

layui实现（学生）数据的增删改查

layui实现（学生）数据的增删改查
添加成功！

修改：

点击编辑按钮：
layui实现（学生）数据的增删改查
修改信息数据，点击提交：

修改数据成功！

删除：

点击删除按钮：
layui实现（学生）数据的增删改查
点击确定，删除成功！

分页：

layui实现（学生）数据的增删改查

由于数据有限，选择5条/页，进行分页：
layui实现（学生）数据的增删改查

批量删除：

首先勾选想要删除的行，点击批量删除：
layui实现（学生）数据的增删改查
删除成功：

控制台输出：

layui实现（学生）数据的增删改查

操作后的数据库/表：

layui实现（学生）数据的增删改查

项目代码整体布局：

layui实现（学生）数据的增删改查

补充：（展开查看assers目录的layui-v2.6.8）
文章来源地址https://www.toymoban.com/news/detail-408708.html

代码部分：

创建数据库：

#创建数据库
create database 70806_db
default character set utf8mb4 #设置字符集
default collate utf8mb4_general_ci #设置排序规则

创建数据表：

#创建班级表
create table classInfo
(
	classId int primary key auto_increment,
	className varchar(20)
);

select * from classInfo;

insert into classInfo
(className)
values
('AAA01'),
('AAA02');

#创建学生表
create table studentInfo
(
	studentId int primary key auto_increment,
	name varchar(20) not null,
	sex char(1) not null,
	birthday date,
	province varchar(20) default '河南',
	classId int,
	foreign key (classId)
	references classInfo(classId)
);

select * from studentInfo;

insert into studentInfo
(name,sex,birthday,province,classId)
values
('张三','男','2002-01-01','湖北',1),
('李四','女','2003-01-05','河南',2),
('王五','男','2010-03-01','湖北',1),
('赵六','男','2009-01-08','河南',2),
('孙琪','女','2001-09-01','湖北',1);

util：

BaseDAO:

package com.util;

import java.sql.*;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class BaseDAO {

	//四大金刚
	//驱动类
	private static final String DRIVER="com.mysql.cj.jdbc.Driver";
	//连接地址
	private static final String URL="jdbc:mysql://localhost:3306/70806_db?useSSL=false&characterEncoding=utf8&serverTimezone=Asia/Shanghai";
	//用户名
	private static final String USER="root";
	//密码
	private static final String PASSWORD="123456";



	//获取连接
	public static Connection getConnection(){

		Connection con = null;

		try{
			//加载驱动类
			Class.forName(DRIVER);
			//获取连接
			con = DriverManager.getConnection(URL,USER,PASSWORD);
			
		}catch(Exception ex){
			ex.printStackTrace();
		}

		return con;
	}

	//关闭数据库对象
	public static void closeAll(Connection con,Statement st,ResultSet rs){
		
		if(rs!=null){
			try{
				rs.close();
			}catch(Exception ex){
				ex.printStackTrace();
			}
			
		}

		if(st!=null){

			try{
				st.close();
			}catch(Exception ex){
				ex.printStackTrace();
			}
			
		}

		if(con!=null){
			try{
				con.close();
			}catch(Exception ex){
				ex.printStackTrace();
			}
			
		}

	}


	//通用设置参数方法
	public static void setParams(PreparedStatement pst,Object[] params){

		if(params==null){
			return;
		}

		for(int i=0;i<params.length;i++){
			try{
				pst.setObject(i+1,params[i]);
			}catch(Exception ex){
				ex.printStackTrace();
			}
		}
	}


	//通用增删改
	public static int executeUpdate(String sql,Object[] params){

		Connection con = null;
		PreparedStatement pst = null;
		
		int res = -1;
		
		try{

			//获取连接
			con = getConnection();
			//创建预编译命令执行对象
			pst = con.prepareStatement(sql);
			//设置参数
			setParams(pst,params);
			//执行
			System.out.println(pst);
			res = pst.executeUpdate();

		}catch(Exception ex){
			ex.printStackTrace();
		}finally{
			closeAll(con,pst,null);
		}
		
		return res;
	}

	//获取总记录数的查询:select count(*) from ..
	public static int getTotal(String sql,Object[] params){
		int total = 0;

		Connection con = null;
		PreparedStatement pst = null;
		ResultSet rs = null;

		try{

			con = getConnection();
			pst = con.prepareStatement(sql);
			setParams(pst,params);
			rs = pst.executeQuery();
			//判断是否查询除了一个记录
			if(rs.next()){
				total = rs.getInt(1);
			}

		}catch (Exception ex){
			ex.printStackTrace();
		}finally {
			closeAll(con,pst,rs);
		}

		return total;
	}


	//通用查询
	public static List<Map<String,Object>> executeQuery(String sql,Object[] params) {

		List<Map<String,Object>> rows = new ArrayList<>();

		Connection con = null;
		PreparedStatement pst = null;
		ResultSet rs = null;

		try{
			//获取连接	
			con = getConnection();			
			//获取命令对象
			pst = con.prepareStatement(sql);
			//设置参数
			setParams(pst,params);
			//执行查询
			rs = pst.executeQuery();

			//通过rs获取结果集的结构信息
			ResultSetMetaData rsmd =  rs.getMetaData();
			//获取结果集的列数
			int colCount = rsmd.getColumnCount();

			//遍历查询结果，并封装到List<Map>中
			while(rs.next()){
				//用Map存储当前行的各个列数据
				Map<String,Object> map = new HashMap<>();
				//循环获取每一列的信息
				for(int i=1;i<=colCount;i++){
					//获取列名(使用rsmd)
					String colName = rsmd.getColumnLabel(i);
					//获取列值(使用rs)
					Object colVal = rs.getObject(i);
					//将当前列存储到map中
					map.put(colName,colVal);								
				}
				
				//将遍历的当前行的数据存储到List中
				rows.add(map);
							
			}


		}catch(Exception ex){
			ex.printStackTrace();
		}finally{
			closeAll(con,pst,rs);
		}
		
		return rows;

	}

}

entity：

Student :

package com.entity;

import java.util.Date;

public class Student {
    private Integer studentId;
    private String name;
    private String sex;
    private Date birthday;
    private String province;
    private Integer classId;

    public Student() {
    }

    public Student(Integer studentId, String name, String sex, Date birthday, String province, Integer classId) {
        this.studentId = studentId;
        this.name = name;
        this.sex = sex;
        this.birthday = birthday;
        this.province = province;
        this.classId = classId;
    }

    public Student(String name, String sex, Date birthday, String province, Integer classId) {
        this.name = name;
        this.sex = sex;
        this.birthday = birthday;
        this.province = province;
        this.classId = classId;
    }

    public Integer getStudentId() {
        return studentId;
    }

    public void setStudentId(Integer studentId) {
        this.studentId = studentId;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public String getProvince() {
        return province;
    }

    public void setProvince(String province) {
        this.province = province;
    }

    public Integer getClassId() {
        return classId;
    }

    public void setClassId(Integer classId) {
        this.classId = classId;
    }

    @Override
    public String toString() {
        return "Student{" +
                "studentId=" + studentId +
                ", name='" + name + '\'' +
                ", sex='" + sex + '\'' +
                ", birthday=" + birthday +
                ", province='" + province + '\'' +
                ", classId=" + classId +
                '}';
    }
}

ClassInfo:

package com.entity;

public class ClassInfo {
    private Integer classId;
    private String className;

    public ClassInfo() {
    }

    public ClassInfo(String className) {
        this.className = className;
    }

    public ClassInfo(Integer classId, String className) {
        this.classId = classId;
        this.className = className;
    }

    public Integer getClassId() {
        return classId;
    }

    public void setClassId(Integer classId) {
        this.classId = classId;
    }

    public String getClassName() {
        return className;
    }

    public void setClassName(String className) {
        this.className = className;
    }

    @Override
    public String toString() {
        return "ClassInfo{" +
                "classId=" + classId +
                ", className='" + className + '\'' +
                '}';
    }
}

PageData:

package com.entity;

public class PageData {
    //当前页码
    private Integer pageNo;
    //每页记录数
    private Integer pageSize;
    //总记录数
    private Integer totalCount;
    //总页数
    private Integer totalPage;
    //当前页记录
    private Object data;

    public PageData() {
    }

    public Integer getPageNo() {
        return pageNo;
    }

    public void setPageNo(Integer pageNo) {
        this.pageNo = pageNo;
    }

    public Integer getPageSize() {
        return pageSize;
    }

    public void setPageSize(Integer pageSize) {
        this.pageSize = pageSize;
    }

    public Integer getTotalCount() {
        return totalCount;
    }

    public void setTotalCount(Integer totalCount) {
        this.totalCount = totalCount;
    }

    public Integer getTotalPage() {
        return totalPage;
    }

    public void setTotalPage(Integer totalPage) {
        this.totalPage = totalPage;
    }

    public Object getData() {
        return data;
    }

    public void setData(Object data) {
        this.data = data;
    }

    @Override
    public String toString() {
        return "PageData{" +
                "pageNo=" + pageNo +
                ", pageSize=" + pageSize +
                ", totalCount=" + totalCount +
                ", totalPage=" + totalPage +
                ", data=" + data +
                '}';
    }
}

CommonResult:

package com.entity;

public class CommonResult {
    //编码:0成功，1失败
    private Integer code;
    //提示消息
    private String msg;
    //记录数
    private Integer count;
    //记录数据
    private Object data;

    public CommonResult() {
    }

    public CommonResult(Integer code, String msg, Integer count, Object data) {
        this.code = code;
        this.msg = msg;
        this.count = count;
        this.data = data;
    }

    //返回查询结果的成功信息:
    public static CommonResult success(Integer count,Object data){
        return new CommonResult(0,"success",count,data);
    }

    //返回增删改的成功信息
    public static CommonResult success(){
        return new CommonResult(0,"success",null,null);
    }

    //返回失败信息
    public static CommonResult fail(){
        return new CommonResult(1,"fail",null,null);
    }


    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public Integer getCount() {
        return count;
    }

    public void setCount(Integer count) {
        this.count = count;
    }

    public Object getData() {
        return data;
    }

    public void setData(Object data) {
        this.data = data;
    }

    @Override
    public String toString() {
        return "CommonResult{" +
                "code=" + code +
                ", msg='" + msg + '\'' +
                ", count=" + count +
                ", data=" + data +
                '}';
    }
}

dao：

impl:

StudentDAOImpl:

package com.dao.impl;

import com.dao.IStudentDAO;
import com.entity.PageData;
import com.entity.Student;
import com.util.BaseDAO;

import java.util.List;
import java.util.Map;

public class StudentDAOImpl implements IStudentDAO {
    @Override
    public int delete(String ids) {
        System.out.println("=======StudentDAOImpl delete===============");
        String sql = "delete from studentInfo where studentId in ("+ids +") ";
        return BaseDAO.executeUpdate(sql,null);
    }

    @Override
    public List<Map<String, Object>> listAll() {
        System.out.println("=======StudentDAOImpl listAll===============");
        String sql = "select s.studentId,s.name,s.sex,s.birthday,s.province," +
                "     c.classId,c.className " +
                "     from studentInfo s " +
                "     join classInfo c " +
                "     on s.classId = c.classId ";
        System.out.println(sql);
        return BaseDAO.executeQuery(sql,null);
    }

    @Override
    public int insert(Student student) {
        String sql="insert into studentInfo "+
                "   (name,sex,birthday,province,classId)"+
                "   values"+
                "   (?,?,?,?,?)";
        Object[] params={
                student.getName(),
                student.getSex(),
                student.getBirthday(),
                student.getProvince(),
                student.getClassId()
        };
        return BaseDAO.executeUpdate(sql,params);
    }

    @Override
    public int update(Student student) {
        String sql = "update studentInfo" +
                "     set name = ?," +
                "         sex = ?," +
                "         birthday = ?," +
                "         province  = ?," +
                "         classId = ? " +
                "     where studentId = ? ";
        Object[] params = {
                student.getName(),
                student.getSex(),
                student.getBirthday(),
                student.getProvince(),
                student.getClassId(),
                student.getStudentId()
        };
        return BaseDAO.executeUpdate(sql,params);
    }

    @Override
    public PageData queryByPage(Integer pageNo, Integer pageSize) {
        //获取总记录数
        String totalSql = "select count(*) from studentInfo ";
        //总记录数
        Integer totalCount = BaseDAO.getTotal(totalSql,null);
        //总页数
        Integer totalPage = totalCount%pageSize==0?totalCount/pageSize:totalCount/pageSize+1;

        //分页查询
        String pageSql = "select s.studentId,s.name,s.sex,s.birthday,s.province," +
                "     c.classId,c.className " +
                "     from studentInfo s " +
                "     join classInfo c " +
                "     on s.classId = c.classId " +
                "     order by s.studentId " +
                "     limit ?,? ";
        int start = (pageNo-1)*pageSize;
        Object[] params = {start,pageSize};
        List<Map<String,Object>> rows = BaseDAO.executeQuery(pageSql,params);

        //封装分页数据对象
        PageData pd = new PageData();
        pd.setPageNo(pageNo);
        pd.setPageSize(pageSize);
        pd.setTotalPage(totalPage);
        pd.setTotalCount(totalCount);
        pd.setData(rows);

        return pd;
    }

}

ClassInfoDAOImpl:

package com.dao.impl;

import com.dao.IClassInfoDAO;
import com.util.BaseDAO;

import java.util.List;
import java.util.Map;

public class ClassInfoDAOImpl implements IClassInfoDAO {
    @Override
    public List<Map<String, Object>> listAll() {
        String sql="select classId,className from classInfo";
        return BaseDAO.executeQuery(sql,null);
    }
}

IStudentDAO:

package com.dao;

import com.entity.PageData;
import com.entity.Student;

import java.util.List;
import java.util.Map;

public interface IStudentDAO {
    List<Map<String,Object>> listAll();
    //插入方法
    int insert(Student student);
    //修改
    int update(Student student);

    PageData queryByPage(Integer pageNo, Integer pageSize);

    //删除:1     2,3,4 delete from student where studentId in ()
    int delete(String ids);
}

IClassInfoDAO:

package com.dao;

import java.util.List;
import java.util.Map;

public interface IClassInfoDAO {
    List<Map<String ,Object>> listAll();
}

service：

impl:

StudentServiceImpl:

package com.service.impl;

import com.dao.IStudentDAO;
import com.dao.impl.StudentDAOImpl;
import com.entity.PageData;
import com.entity.Student;
import com.service.IStudentService;
import com.util.BaseDAO;

import java.util.List;
import java.util.Map;

public class StudentServiceImpl implements IStudentService {
    @Override
    public int delete(String ids) {
        return studentDAO.delete(ids);
    }

    private IStudentDAO studentDAO=new StudentDAOImpl();

    @Override
    public int update(Student student) {
        return studentDAO.update(student);
    }

    @Override
    public PageData queryByPage(Integer pageNo, Integer pageSize) {
        return studentDAO.queryByPage(pageNo,pageSize);
    }

    @Override
    public int add(Student student) {
        return studentDAO.insert(student);
    }

    @Override
    public List<Map<String, Object>> listAll() {
        return studentDAO.listAll();
    }

}

ClassInfoServiceImpl:

package com.service.impl;

import com.dao.IClassInfoDAO;
import com.dao.impl.ClassInfoDAOImpl;
import com.service.IClassInfoService;

import java.util.List;
import java.util.Map;

public class ClassInfoServiceImpl implements IClassInfoService {
    private IClassInfoDAO classInfoDAO=new ClassInfoDAOImpl();
    @Override
    public List<Map<String, Object>> listAll() {
        return classInfoDAO.listAll();
    }
}

IStudentService:

package com.service;

import com.entity.PageData;
import com.entity.Student;

import java.util.List;
import java.util.Map;

public interface IStudentService {
    List<Map<String,Object>> listAll();

    //添加学生
    int add(Student student);

    int update(Student student);

    PageData queryByPage(Integer pageNo, Integer pageSize);

    //删除:单个删除和批量删除
    int delete(String ids);
}

IClassInfoService:

package com.service;

import java.util.List;
import java.util.Map;

public interface IClassInfoService {
    List<Map<String,Object>> listAll();
}

servlet：

StudentServlet:

package com.servlet;

import com.alibaba.fastjson.JSONObject;
import com.entity.CommonResult;
import com.entity.PageData;
import com.entity.Student;
import com.mysql.cj.util.StringUtils;
import com.service.IStudentService;
import com.service.impl.StudentServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

@WebServlet(urlPatterns = "/StudentServlet/*")
public class StudentServlet extends HttpServlet {
    private IStudentService studentService = new StudentServiceImpl();

    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //获取请求方法
        String uri = req.getRequestURI();
        String process = uri.substring(uri.lastIndexOf("/")+1);

        System.out.println("proccess:"+process);

//        //设置响应编码
//        resp.setContentType("text/html;charset=utf-8");

        //定义处理之后返回的数据对象
        Object data = null;

        switch (process){
            case "query":
                data = this.query(req,resp);
                break;
            case "queryByPage":
                data = this.queryByPage(req,resp);
                break;
            case "queryForLayUI":
                data = this.queryForLayUI(req,resp);
                break;
            case "add":
                data=this.add(req,resp);
                break;
            case "update":
                data = this.update(req,resp);
                break;
            case "del":
                data = this.del(req,resp);
                break;
        }

        System.out.println("data:"+data);
        //将数据转为json字符串
        String jsonStr = JSONObject.toJSONStringWithDateFormat(data,"yyyy-MM-dd");
        System.out.println(jsonStr);
        PrintWriter out = resp.getWriter(); //获取输出流对象
        out.println(jsonStr); //输出json字符串给浏览器
        out.flush(); //清空缓存
        out.close();//关闭流对象
    }

    //根据id删除
    private Object del(HttpServletRequest req, HttpServletResponse resp) {
        String ids = req.getParameter("ids");
        int count = studentService.delete(ids);
        if (count>0){
            return CommonResult.success();
        }else{
            return CommonResult.fail();
        }
    }


    private Object queryForLayUI(HttpServletRequest req, HttpServletResponse resp) {
        //获取前端传入的分页参数
        String pageNo = req.getParameter("page");
        String pageSize = req.getParameter("limit");
        //判断参数是否有效
        Integer pn = StringUtils.isNullOrEmpty(pageNo)?1:Integer.parseInt(pageNo);
        Integer ps = StringUtils.isNullOrEmpty(pageSize)?3:Integer.parseInt(pageSize);

        PageData pd =  studentService.queryByPage(pn,ps);

        return new CommonResult(0,"success",pd.getTotalCount(),pd.getData());
    }

    private Object queryByPage(HttpServletRequest req, HttpServletResponse resp) {
        //获取前端传入的分页参数
        String pageNo = req.getParameter("pageNo");
        String pageSize = req.getParameter("pageSize");
        //判断参数是否有效
        Integer pn = StringUtils.isNullOrEmpty(pageNo)?1:Integer.parseInt(pageNo);
        Integer ps = StringUtils.isNullOrEmpty(pageSize)?3:Integer.parseInt(pageSize);

        return studentService.queryByPage(pn,ps);
    }

    private Object update(HttpServletRequest req, HttpServletResponse resp) {
        System.out.println("111");
        //获取传入的数据
        Integer studentId = Integer.parseInt(req.getParameter("studentId"));
        String name = req.getParameter("name");
        String sex = req.getParameter("sex");
        Date birthday = java.sql.Date.valueOf(req.getParameter("birthday"));
        String province = req.getParameter("province");
        Integer classId = Integer.parseInt(req.getParameter("classId"));

        //封装实体对象
        Student student = new Student(
                studentId,name,sex,birthday,province,classId
        );

        //调用业务层保存数据
        int count = studentService.update(student);
        System.out.println("count:"+count);

        //定义结果数据
        Map<String,Object> res = new HashMap<>();
        //添加成功
        if(count==1){
            //code为0说明处理成功
            res.put("code",0);
        }else{
            //code为1处理失败
            res.put("code",1);
        }
        System.out.println("res:"+res);
        return res;
    }

    //添加
    private Object add(HttpServletRequest req, HttpServletResponse resp) {
        //获取传入的数据
        String name=req.getParameter("name");
        String sex=req.getParameter("sex");
        Date birthday=java.sql.Date.valueOf(req.getParameter("birthday"));
        String province=req.getParameter("province");
        Integer classId=Integer.parseInt(req.getParameter("classId"));

        //封装实体对象
        Student student=new Student(
                name,sex,birthday,province,classId
        );

        //调用业务层保存数据
        int count= studentService.add(student);

        //定义数据结果
        Map<String,Object> res=new HashMap<>();
        //添加成功
        if(count==1){
            //code为0说明处理成功
            res.put("code",0);
        }else{
            //code为1处理失败x`
            res.put("code",1);
        }
        return res;

    }

    /**
     * 执行查询
     * @param req
     * @param resp
     * @return
     */
    private Object query(HttpServletRequest req, HttpServletResponse resp) {
        System.out.println("=====StudentServlet query=======");
        return studentService.listAll();
    }
}

ClassInfoServlet:

package com.servlet;

import com.alibaba.fastjson.JSONObject;
import com.entity.CommonResult;
import com.service.IClassInfoService;
import com.service.impl.ClassInfoServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import java.util.Map;

@WebServlet("/ClassInfoServlet/*")
public class ClassInfoServlet extends HttpServlet {
    //业务层对象
    private IClassInfoService classInfoService=new ClassInfoServiceImpl();
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String uri=req.getRequestURI();
        String process=uri.substring(uri.lastIndexOf("/")+1);
        //定义结果对象
        Object date=null;
        switch (process){
            case "query":
                date=query(req,resp);
                break;
        }

        //输出json字符串
        String jsonStr= JSONObject.toJSONString(date);
        PrintWriter out=resp.getWriter();
        out.println(jsonStr);
        out.flush();
        out.close();

    }

    //查询
    private Object query(HttpServletRequest req, HttpServletResponse resp) {
        List<Map<String,Object>> clsList = classInfoService.listAll();
        return CommonResult.success(clsList.size(), clsList);
    }
}

AjaxServlet :

package com.servlet;

import com.alibaba.fastjson.JSONArray;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@WebServlet(urlPatterns = "/AjaxServlet")
public class AjaxServlet extends HttpServlet {
    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String method = req.getMethod();
        System.out.println("method:"+method);
        String name = req.getParameter("name");
        String sex = req.getParameter("sex");
        System.out.println(name+" "+sex);

        //String locaDateTime = LocalDateTime.now().toString();
        Map<String,Object> map1 = new HashMap<String,Object>();
        map1.put("id",1001);
        map1.put("name","张三");
        map1.put("sex","男");

        Map<String,Object> map2 = new HashMap<>();
        map2.put("id",1002);
        map2.put("name","李四");
        map2.put("sex","女");

        List<Map<String,Object>> stuList = new ArrayList<>();
        stuList.add(map1);
        stuList.add(map2);

        //String jsonStr = "{\"name\":\"张三\",\"sex\":\"男\"}";

        //将java对象转为json字符串:jackson,Gson,fastjson
        System.out.println(stuList);
        //将数据转为json字符串
        String jsonStr =  JSONArray.toJSONString(stuList); //实体对象,map
        System.out.println(jsonStr);


        resp.setContentType("text/html;charset=utf-8");
        //获取输出流对象
        PrintWriter out = resp.getWriter();
        out.println(jsonStr);
        out.flush();
        out.close();

    }
}

filter：

CharacterEncodingFilter:

package com.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;

@WebFilter("/*")
public class CharacterEncodingFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        //设置编码
        servletRequest.setCharacterEncoding("utf-8");
        servletResponse.setContentType("text/html;charset=utf-8");
        //向后传递请求
        filterChain.doFilter(servletRequest,servletResponse);
    }
}

web:

lay6.jsp:

<%--
  Created by IntelliJ IDEA.
  User: 33154
  Date: 2022/8/9
  Time: 8:52
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
    <title>开始使用 layui</title>
    <!-- 引入 layui.css -->
    <%--    <link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath}/assets/plugins/layui-v2.6.8/layui/css/layui.css?t=<%=Math.random()%>"/>--%>
    <!-- 引入 layui.css -->
    <link rel="stylesheet" href="//unpkg.com/layui@2.6.8/dist/css/layui.css">
</head>
<body>

<!--要渲染的数据表格-->
<table id="stu" lay-filter="stu"></table>

<!--弹出表单-->
<form class="layui-form" action="" style="display: none;margin:10px" id="stuFrm" lay-filter="stuFrm">
    <!--学生编号，修改的时候，需要传这个值-->
    <input type="hidden" id="studentId" name="studentId"/>
    <!--设置提交的地址-->
    <input type="hidden" id="action" name="action">

    <div class="layui-form-item">
        <label class="layui-form-label">姓名</label>
        <div class="layui-input-block">
            <input type="text" name="name"  lay-verify="required" placeholder="请输入姓名" autocomplete="off" class="layui-input">
        </div>
    </div>
    <div class="layui-form-item">
        <label class="layui-form-label">单选框</label>
        <div class="layui-input-block">
            <input type="radio" name="sex" value="男" title="男">
            <input type="radio" name="sex" value="女" title="女" checked>
        </div>
    </div>
    <div class="layui-form-item">
        <label class="layui-form-label">班级</label>
        <div class="layui-input-block">
            <select name="classId" id="classId" lay-verify="required">
                <option value=""></option>
            </select>
        </div>
    </div>
    <div class="layui-form-item">
        <label class="layui-form-label">省份</label>
        <div class="layui-input-block">
            <select name="province" lay-verify="required">
                <option value="">请选择</option>
                <option value="河南">河南</option>
                <option value="河北">河北</option>
                <option value="山东">山东</option>
                <option value="湖北">湖北</option>
            </select>
        </div>
    </div>
    <div class="layui-form-item">
        <label class="layui-form-label">生日</label>
        <div class="layui-input-block">
            <input type="text" name="birthday" id="birthday"  lay-verify="required" placeholder="请输入生日" autocomplete="off" class="layui-input">
        </div>
    </div>
    <div class="layui-form-item">
        <div class="layui-input-block">
            <button type="button" class="layui-btn" lay-submit lay-filter="stuBtnSubmit">立即提交</button>
            <button type="reset" class="layui-btn layui-btn-primary">重置</button>
        </div>
    </div>
</form>


<!--定义表格工具条-->
<script type="text/html" id="stuBar">
    <div class="layui-btn-container">
        <!--lay-event:用于设置一个按钮的特定事件，事件名字自己定义-->
        <button type="button" class="layui-btn" lay-event="stuAdd">添加</button>
        <button type="button" class="layui-btn layui-btn-danger" lay-event="stuBatchDel">批量删除</button>
    </div>
</script>
<script type="text/html" id="stuRowBar">
    <div  class="layui-btn-container">
        <!--lay-event:用于设置一个按钮的特定事件，事件名字自己定义-->
        <button type="button" class="layui-btn layui-btn-sm" lay-event="stuEdit">编辑</button>
        <button type="button" class="layui-btn layui-btn-sm layui-btn-danger" lay-event="stuDel">删除</button>
    </div>
</script>

<%--<script type="text/javascript" src="${pageContext.request.contextPath}/assets/plugins/layui-v2.6.8/layui/layui.js?t=<%=Math.random()%>"></script>--%>
<!-- 引入 layui.js -->
<script src="//unpkg.com/layui@2.6.8/dist/layui.js"></script>
<script>
    layui.use(['table','layer','laydate','form'], function(){
        var table = layui.table //表格组件
            ,layer=layui.layer  //弹出层
            ,laydate=layui.laydate //日期
            ,form=layui.form //表单
            ,$ = layui.$; //jq

        //渲染日期框
        laydate.render({
            elem: "#birthday"
        })

        //加载班级下拉框
        loadClassInfo();

        //渲染表格数据
        table.render({
            elem: '#stu' //渲染的目标元素
            ,url: '${pageContext.request.contextPath}/StudentServlet/queryForLayUI' //发送请求获取数据
            ,cellMinWidth: 80 //全局定义常规单元格的最小宽度，layui 2.2.1 新增
            ,toolbar:"#stuBar" //设置表格工具条
            ,defaultToolbar: ['filter']
            ,width:1000
            ,page:true //启用分页
            ,limit:20 //每页条数
            ,limits:[5,10,20,30] //可选条数
            ,cols: [[  //表格列的定义
                {title:"全选",type:"checkbox"}
                ,{field:'studentId', width:80, title: '学号', sort: true}
                ,{field:'name', width:80, title: '姓名'}
                ,{field:'sex', width:80, title: '性别', sort: true,templet:function (d){
                        //console.log(d);
                        if(d.sex=="男")
                            return "<font color='blue'>男</font>";
                        else
                            return "<font color='red'>女</font>";
                    }}
                ,{field:'province', width:80, title: '省份'}
                ,{field:'birthday', title: '生日', width: '30%', width: 120} //minWidth：局部定义当前单元格的最小宽度，layui 2.2.1 新增
                ,{field:'classId', title: '班级编号', hide:true}
                ,{field:'className', title: '班级名字',with:80, sort: true}
                ,{title:"操作",fixed:"right",toolbar:"#stuRowBar"}
            ]]
        });

        //通过table组件监听表格头部工具条触发的事件
        //toolbar(stu):表示table组件要监听stu(lay-filter)这个表格的工具条事件
        //obj:当工具条中的按钮，触发事件时，layui会将事件信息封装为对象，传入到这个参数中
        table.on("toolbar(stu)",function (obj){
            console.log(obj);
            //根据触发的事件做特定处理
            switch (obj.event){
                case "stuAdd":
                    //弹出表单
                    $("#action").val("${pageContext.request.contextPath}/StudentServlet/add");
                    showStuFrm();
                    break;
                case "stuBatchDel":
                    //点击批量删除，获取当前选中行的信息
                    var checkStatus = table.checkStatus('stu'); //idTest 即为基础参数 id 对应的值
                    //输出选中行对象属性
                    //console.log(checkStatus);
                    //console.log(checkStatus.data) //获取选中行的数据
                    //console.log(checkStatus.data.length) //获取选中行数量，可作为是否有选中行的条件
                    //console.log(checkStatus.isAll ) //表格是否全选
                    //判断当前是否有选中行
                    if(checkStatus.data.length==0){
                        layer.msg("请先选中一行");
                        return;
                    }
                    var ids = [];
                    for(var i=0;i<checkStatus.data.length;i++){
                        ids.push(checkStatus.data[i].studentId);
                    }
                    //拼接数组中的id: 3,4,5,6
                    ids = ids.join(",");
                    delStu(ids);
                    break;
            }
        })

        //通过table组件，监听行工具条事件
        table.on("tool(stu)",function (obj){
            console.log(obj);
            //判断点击按钮的事件
            switch (obj.event){
                case "stuEdit":
                    //弹出表单
                    $("#action").val("${pageContext.request.contextPath}/StudentServlet/update");
                    showStuFrm();
                    //为表单设值
                    form.val("stuFrm",obj.data);
                    break;
                case "stuDel":
                    layer.confirm("确定要删除么?",function (index){
                        var ids = obj.data.studentId;
                        delStu(ids);
                        //关闭确认框
                        layer.close(index);
                    })
                    break;
            }
        })



        //绑定表单中，提交按钮的提交事件
        form.on("submit(stuBtnSubmit)",function (obj){
            console.log(obj);
            $.ajax({
                url:$("#action").val(),
                type:"post",
                data:obj.field, //表单数据
                dataType:"json",
                success:function (res){
                    if(res.code==0){
                        layer.msg("添加成功",{icon:6});
                        //关闭表单
                        layer.close(stuFrmIndex);
                        //表单重置
                        $("#stuFrm")[0].reset();
                        //刷新表格
                        table.reload('stu', {
                            page: {
                                curr: 1 //重新从第 1 页开始
                            }
                        });
                    }else{
                        layer.msg("添加失败",{icon:5});
                    }
                }
            })
        })

        //删除学生
        function delStu(ids){
            $.ajax({
                url:"${pageContext.request.contextPath}/StudentServlet/del",
                data:{ids:ids},
                type:"post",
                dataType:"json",
                success:function (res){
                    if(res.code==0){
                        layer.msg("删除成功!",{icon:6});
                        //重新加载表格
                        //刷新表格
                        table.reload('stu', {
                            page: {
                                curr: 1 //重新从第 1 页开始
                            }
                        });
                    }else{
                        layer.msg("删除失败!",{icon:5})
                    }
                }
            })
        }

        //加载班级数据
        function loadClassInfo(){
            $.ajax({
                url:"${pageContext.request.contextPath}/ClassInfoServlet/query",
                type: "get",
                dataType:"json",
                success:function (res){
                    console.log(res);
                    //循环数据，将班级添加到下拉框中
                    for(var i=0;i<res.data.length;i++){
                        var cls = res.data[i];
                        $("#classId").append("<option value='"+cls.classId+"'>"+cls.className+"</option>")
                    }

                    //重新渲染下拉框
                    form.render('select')
                }
            })
        }

        var stuFrmIndex;
        //定义函数弹出学生表单
        function  showStuFrm(){
            //页面层
            stuFrmIndex=layer.open({
                type: 1,
                area: ['600px',"400px"],
                content: $('#stuFrm')   //弹出页面元素
            });
        }
    });
</script>
</body>
</html>

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