实战SpringMVC之CRUD

目录

一、前期准备

1.1 编写页面跳转控制类

二、实现CRUD

2.1 相关依赖

2.2 配置文件

2.3 逆向生成

2.4 后台代码完善

2.4.1 编写切面类

2.4.2 编写工具类

2.4.3 编写biz层

2.4.4 配置mapper.xml

2.4.5 编写相应接口类（MusicMapper）

2.4.6 处理controller层发送到biz的请求(配置spring-mvc.xml)

2.4.7 编写tag助手标签类

2.4.8 引入tld标签库

2.4.9 编写controller类

2.5 前台代码

2.5.1 主页面编写

2.5.2 修改界面编写

三、展示效果

四、实战SpringMVC增删改查的收获

一、前期准备

1.1 编写页面跳转控制类

通过@PathVariable方式实现公共页面跳转。代码如下：

package com.Kissship.web;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * @author Kissship
 * @site www.Kissship.com
 * @company xxx公司
 * @create 2023-09-07-15:01
 *
 * 用来处理页面跳转
 */
@Controller
public class PageController {

    //<a href="order/preSave">新增</a>   新增界面
    @RequestMapping("/page/{page}")
    public String toPage(@PathVariable("page") String page){
        return page;
    }

    @RequestMapping("/page/{dir}{page}")
    public String toDirPage(@PathVariable("dir") String dir,
                         @PathVariable("page") String page){
        return dir + "/" + page;
    }

}

二、实现CRUD

2.1 相关依赖

pom.xml：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>org.example</groupId>
  <artifactId>kissshipssm</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

  <name>kissshipssm Maven Webapp</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <maven.compiler.plugin.version>3.7.0</maven.compiler.plugin.version>

    <!--添加jar包依赖-->
    <!--1.spring 5.0.2.RELEASE相关-->
    <spring.version>5.0.2.RELEASE</spring.version>
    <!--2.mybatis相关-->
    <mybatis.version>3.4.5</mybatis.version>
    <!--mysql-->
    <mysql.version>5.1.44</mysql.version>
    <!--pagehelper分页jar依赖-->
    <pagehelper.version>5.1.2</pagehelper.version>
    <!--mybatis与spring集成jar依赖-->
    <mybatis.spring.version>1.3.1</mybatis.spring.version>
    <!--3.dbcp2连接池相关 druid-->
    <commons.dbcp2.version>2.1.1</commons.dbcp2.version>
    <commons.pool2.version>2.4.3</commons.pool2.version>
    <!--4.log日志相关-->
    <log4j2.version>2.9.1</log4j2.version>
    <log4j2.disruptor.version>3.2.0</log4j2.disruptor.version>
    <slf4j.version>1.7.13</slf4j.version>
    <!--5.其他-->
    <junit.version>4.12</junit.version>
    <servlet.version>4.0.0</servlet.version>
    <lombok.version>1.18.2</lombok.version>

    <mybatis.ehcache.version>1.1.0</mybatis.ehcache.version>
    <ehcache.version>2.10.0</ehcache.version>

    <redis.version>2.9.0</redis.version>
    <redis.spring.version>1.7.1.RELEASE</redis.spring.version>
    <jackson.version>2.9.3</jackson.version>
    <jstl.version>1.2</jstl.version>
    <standard.version>1.1.2</standard.version>
    <tomcat-jsp-api.version>8.0.47</tomcat-jsp-api.version>
    <commons-fileupload.version>1.3.3</commons-fileupload.version>
    <hibernate-validator.version>5.0.2.Final</hibernate-validator.version>

    <shiro.version>1.3.2</shiro.version>
  </properties>

  <dependencies>
    <!--1.spring相关-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-orm</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aspects</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>${spring.version}</version>
    </dependency>


    <!--2.mybatis相关-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>${mybatis.version}</version>
    </dependency>
    <!--mysql-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>${mysql.version}</version>
    </dependency>
    <!--pagehelper分页插件jar包依赖-->
    <dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>${pagehelper.version}</version>
    </dependency>
    <!--mybatis与spring集成jar包依赖-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>${mybatis.spring.version}</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context-support</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <!--mybatis与ehcache整合-->
    <dependency>
      <groupId>org.mybatis.caches</groupId>
      <artifactId>mybatis-ehcache</artifactId>
      <version>${mybatis.ehcache.version}</version>
    </dependency>
    <!--ehcache依赖-->
    <dependency>
      <groupId>net.sf.ehcache</groupId>
      <artifactId>ehcache</artifactId>
      <version>${ehcache.version}</version>
    </dependency>

    <dependency>
      <groupId>redis.clients</groupId>
      <artifactId>jedis</artifactId>
      <version>${redis.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework.data</groupId>
      <artifactId>spring-data-redis</artifactId>
      <version>${redis.spring.version}</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>${jackson.version}</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>${jackson.version}</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
      <version>${jackson.version}</version>
    </dependency>

    <!--3.dbcp2连接池相关-->
    <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-dbcp2</artifactId>
      <version>${commons.dbcp2.version}</version>
      <exclusions>
        <exclusion>
          <artifactId>commons-pool2</artifactId>
          <groupId>org.apache.commons</groupId>
        </exclusion>
      </exclusions>
    </dependency>
    <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-pool2</artifactId>
      <version>${commons.pool2.version}</version>
    </dependency>

    <!--springmvc依赖-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <!--4.log日志相关依赖-->

    <!-- log4j2日志相关依赖 -->
    <!-- log配置：Log4j2 + Slf4j -->
    <!-- slf4j核心包-->
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>${slf4j.version}</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>jcl-over-slf4j</artifactId>
      <version>${slf4j.version}</version>
      <scope>runtime</scope>
    </dependency>

    <!--核心log4j2jar包-->
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-api</artifactId>
      <version>${log4j2.version}</version>
    </dependency>
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-core</artifactId>
      <version>${log4j2.version}</version>
    </dependency>
    <!--用于与slf4j保持桥接-->
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-slf4j-impl</artifactId>
      <version>${log4j2.version}</version>
    </dependency>
    <!--web工程需要包含log4j-web，非web工程不需要-->
    <dependency>
      <groupId>org.apache.logging.log4j</groupId>
      <artifactId>log4j-web</artifactId>
      <version>${log4j2.version}</version>
      <scope>runtime</scope>
    </dependency>

    <!--需要使用log4j2的AsyncLogger需要包含disruptor-->
    <dependency>
      <groupId>com.lmax</groupId>
      <artifactId>disruptor</artifactId>
      <version>${log4j2.disruptor.version}</version>
    </dependency>

    <!--5.其他-->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>${junit.version}</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>${servlet.version}</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>${lombok.version}</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>${jstl.version}</version>
    </dependency>
    <dependency>
      <groupId>taglibs</groupId>
      <artifactId>standard</artifactId>
      <version>${standard.version}</version>
    </dependency>
    <dependency>
      <groupId>org.apache.tomcat</groupId>
      <artifactId>tomcat-jsp-api</artifactId>
      <version>${tomcat-jsp-api.version}</version>
    </dependency>
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>${commons-fileupload.version}</version>
    </dependency>

    <dependency>
      <groupId>org.hibernate</groupId>
      <artifactId>hibernate-validator</artifactId>
      <version>${hibernate-validator.version}</version>
    </dependency>

    <!--shiro依赖-->
    <dependency>
      <groupId>org.apache.shiro</groupId>
      <artifactId>shiro-core</artifactId>
      <version>${shiro.version}</version>
    </dependency>
    <dependency>
      <groupId>org.apache.shiro</groupId>
      <artifactId>shiro-web</artifactId>
      <version>${shiro.version}</version>
    </dependency>
    <dependency>
      <groupId>org.apache.shiro</groupId>
      <artifactId>shiro-spring</artifactId>
      <version>${shiro.version}</version>
    </dependency>
      <dependency>
          <groupId>org.example</groupId>
          <artifactId>Spring-mybatis</artifactId>
          <version>1.0-SNAPSHOT</version>
          <scope>compile</scope>
      </dependency>
  </dependencies>


  <build>
    <finalName>kissshipssm</finalName>
    <resources>
      <!--解决mybatis-generator-maven-plugin运行时没有将XxxMapper.xml文件放入target文件夹的问题-->
      <resource>
        <directory>src/main/java</directory>
        <includes>
          <include>**/*.xml</include>
        </includes>
      </resource>
      <!--解决mybatis-generator-maven-plugin运行时没有将jdbc.properites文件放入target文件夹的问题-->
      <resource>
        <directory>src/main/resources</directory>
        <includes>
          <include>*.properties</include>
          <include>*.xml</include>
        </includes>
      </resource>
    </resources>

    <plugins>

      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>${maven.compiler.plugin.version}</version>
        <configuration>
          <source>${maven.compiler.source}</source>
          <target>${maven.compiler.target}</target>
          <encoding>${project.build.sourceEncoding}</encoding>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.mybatis.generator</groupId>
        <artifactId>mybatis-generator-maven-plugin</artifactId>
        <version>1.3.2</version>
        <dependencies>
          <!--使用Mybatis-generator插件不能使用太高版本的mysql驱动 -->
          <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
          </dependency>
        </dependencies>
        <configuration>
          <overwrite>true</overwrite>
        </configuration>
      </plugin>

      <plugin>
        <artifactId>maven-clean-plugin</artifactId>
        <version>3.1.0</version>
      </plugin>
      <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
      <plugin>
        <artifactId>maven-resources-plugin</artifactId>
        <version>3.0.2</version>
      </plugin>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.8.0</version>
      </plugin>
      <plugin>
        <artifactId>maven-surefire-plugin</artifactId>
        <version>2.22.1</version>
      </plugin>
      <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <version>3.2.2</version>
      </plugin>
      <plugin>
        <artifactId>maven-install-plugin</artifactId>
        <version>2.5.2</version>
      </plugin>
      <plugin>
        <artifactId>maven-deploy-plugin</artifactId>
        <version>2.8.2</version>
      </plugin>
    </plugins>
  </build>

</project>

2.2 配置文件

web.xml：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
  <display-name>Archetype Created Web Application</display-name>
  <!-- Spring和web项目集成start -->
  <!-- spring上下文配置文件 -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring-context.xml</param-value>
  </context-param>
  <!-- 读取Spring上下文的监听器 -->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <!-- Spring和web项目集成end -->

  <!-- 中文乱码处理 -->
  <filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <async-supported>true</async-supported>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <!-- Spring MVC servlet -->
  <servlet>
    <servlet-name>SpringMVC</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!--此参数可以不配置，默认值为：/WEB-INF/springmvc-servlet.xml-->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring-mvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
    <!--web.xml 3.0的新特性，是否支持异步-->
    <async-supported>true</async-supported>
  </servlet>
  <servlet-mapping>
    <servlet-name>SpringMVC</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

2.3 逆向生成

生成后的对应目标目录如下：

在生成后的HBookMapper接口中，需要加上@Repository给Spring进行托管。

2.4 后台代码完善

2.4.1 编写切面类

PagerAspect：

package com.Kissship.aspect;

import com.Kissship.utils.PageBean;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;

import java.util.List;

@Aspect
@Component
public class PagerAspect {
    @Around("execution(* *..*Biz.*Pager(..))")
    public Object invoke(ProceedingJoinPoint args) throws Throwable {
        PageBean pageBean=null;
        Object[] ags = args.getArgs();
        for (Object param:ags){
if (param instanceof PageBean){
    pageBean=(PageBean)param;
    break;
}
        }

        if (pageBean!=null&& pageBean.isPagination()){
            PageHelper.startPage(pageBean.getPage(),pageBean.getRows());
        }
        Object lst = args.proceed();
        if(pageBean!=null && pageBean.isPagination()){
            PageInfo pageInfo = new PageInfo((List) lst);
            pageBean.setTotal((int) pageInfo.getTotal());
        }
        return lst;
    }
}

2.4.2 编写工具类

PageBean：

package com.Kissship.utils;

import javax.servlet.http.HttpServletRequest;
import java.io.Serializable;
import java.util.Map;

/**
 * @author Kissship
 * @site www.Kissship.com
 * @company xxx公司
 * @create 2023-08-15-15:42
 */
public class PageBean implements Serializable {

    private static final long serialVersionUID = 2422581023658455731L;

    //页码
    private int page=1;
    //每页显示记录数
    private int rows=10;
    //总记录数
    private int total=0;
    //是否分页
    private boolean isPagination=true;
    //上一次的请求路径
    private String url;
    //获取所有的请求参数
    private Map<String,String[]> map;

    public PageBean() {
        super();
    }

    //设置请求参数
    public void setRequest(HttpServletRequest req) {
        String page=req.getParameter("page");
        String rows=req.getParameter("rows");
        String pagination=req.getParameter("pagination");
        this.setPage(page);
        this.setRows(rows);
        this.setPagination(pagination);
        this.url=req.getContextPath()+req.getServletPath();
        this.map=req.getParameterMap();
    }
    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public Map<String, String[]> getMap() {
        return map;
    }

    public void setMap(Map<String, String[]> map) {
        this.map = map;
    }

    public int getPage() {
        return page;
    }

    public void setPage(int page) {
        this.page = page;
    }

    public void setPage(String page) {
        if(null!=page&&!"".equals(page.trim()))
            this.page = Integer.parseInt(page);
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        this.rows = rows;
    }

    public void setRows(String rows) {
        if(null!=rows&&!"".equals(rows.trim()))
            this.rows = Integer.parseInt(rows);
    }

    public int getTotal() {
        return total;
    }

    public void setTotal(int total) {
        this.total = total;
    }

    public void setTotal(String total) {
        this.total = Integer.parseInt(total);
    }

    public boolean isPagination() {
        return isPagination;
    }

    public void setPagination(boolean isPagination) {
        this.isPagination = isPagination;
    }

    public void setPagination(String isPagination) {
        if(null!=isPagination&&!"".equals(isPagination.trim()))
            this.isPagination = Boolean.parseBoolean(isPagination);
    }

    /**
     * 获取分页起始标记位置
     * @return
     */
    public int getStartIndex() {
        //(当前页码-1)*显示记录数
        return (this.getPage()-1)*this.rows;
    }

    /**
     * 末页
     * @return
     */
    public int getMaxPage() {
        int totalpage=this.total/this.rows;
        if(this.total%this.rows!=0)
            totalpage++;
        return totalpage;
    }

    /**
     * 下一页
     * @return
     */
    public int getNextPage() {
        int nextPage=this.page+1;
        if(this.page>=this.getMaxPage())
            nextPage=this.getMaxPage();
        return nextPage;
    }

    /**
     * 上一页
     * @return
     */
    public int getPreivousPage() {
        int previousPage=this.page-1;
        if(previousPage<1)
            previousPage=1;
        return previousPage;
    }

    @Override
    public String toString() {
        return "PageBean [page=" + page + ", rows=" + rows + ", total=" + total + ", isPagination=" + isPagination
                + "]";
    }
}

2.4.3 编写biz层

package com.Kissship.biz;

import com.Kissship.model.Music;
import com.Kissship.utils.PageBean;

import java.util.List;

public interface MusicBiz {
    int deleteByPrimaryKey(Integer mid);

    int insert(Music record);

    int insertSelective(Music record);

    Music selectByPrimaryKey(Integer mid);

    int updateByPrimaryKeySelective(Music record);

    int updateByPrimaryKey(Music record);

    List<Music> listPager(Music music, PageBean pageBean);
}

注：

这个方法为查询返回列表方法，包含分页，因为切面类对其进行切面，所以在命名时，必须以Pager结尾。

2.4.4 配置mapper.xml

<select id="selectBycon" resultType="com.Kissship.model.Music" parameterType="com.Kissship.model.Music" >
    select
    <include refid="Base_Column_List" />
    from jay_music
    <where>
      <if test="mname != null">
        and mname like concat('%',#{mname},'%')
      </if>
    </where>
  </select>

2.4.5 编写相应接口类（MusicMapper）

在自动生成的代码下添加以下：

List<Music> selectBycon(Music music);

2.4.6 处理controller层发送到biz的请求(配置spring-mvc.xml)

代码如下：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans.xsd
      http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
      http://www.springframework.org/schema/aop
      http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
      http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!--1) 扫描com.Kissship及子子孙孙包下的控制器(扫描范围过大，耗时)-->
    <context:component-scan base-package="com.Kissship"/>

    <!--2) 此标签默认注册DefaultAnnotationHandlerMapping和AnnotationMethodHandlerAdapter -->
    <mvc:annotation-driven />

    <!--3) 创建ViewResolver视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!-- viewClass需要在pom中引入两个包：standard.jar and jstl.jar -->
        <property name="viewClass"
                  value="org.springframework.web.servlet.view.JstlView"></property>
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

    <!--4) 单独处理图片、样式、js等资源 -->
    <!-- <mvc:resources location="/css/" mapping="/css/**"/>
     <mvc:resources location="/js/" mapping="/js/**"/>
     <mvc:resources location="WEB-INF/images/" mapping="/images/**"/>-->
    <mvc:resources location="/static/" mapping="/static/**"/>

<!-- 处理controller层发送请求到biz，会经过切面的拦截处理-->
    <aop:aspectj-autoproxy/>
</beans>

2.4.7 编写tag助手标签类

PageTag：

package com.Kissship.tag;

import com.Kissship.utils.PageBean;

import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.BodyTagSupport;
import java.io.IOException;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;


public class PageTag extends BodyTagSupport{
	private PageBean pageBean;// 包含了所有分页相关的元素
	
	public PageBean getPageBean() {
		return pageBean;
	}

	public void setPageBean(PageBean pageBean) {
		this.pageBean = pageBean;
	}

	@Override
	public int doStartTag() throws JspException {
//		没有标签体，要输出内容
		JspWriter out = pageContext.getOut();
		try {
			out.print(toHTML());
		} catch (IOException e) {
			e.printStackTrace();
		}
		return super.doStartTag();
	}

	private String toHTML() {
		StringBuffer sb = new StringBuffer();
//		隐藏的form表单---这个就是上一次请求下次重新发的奥义所在
//		上一次请求的URL
		sb.append("<form action='"+pageBean.getUrl()+"' id='pageBeanForm' method='post'>");
		sb.append("	<input type='hidden' name='page'>");
//		上一次请求的参数
		Map<String, String[]> paramMap = pageBean.getMap();
		if(paramMap != null && paramMap.size() > 0) {
			Set<Entry<String, String[]>> entrySet = paramMap.entrySet();
			for (Entry<String, String[]> entry : entrySet) {
//				参数名
				String key = entry.getKey();
//				参数值
				for (String value : entry.getValue()) {
//					上一次请求的参数，再一次组装成了新的Form表单
//					注意：page参数每次都会提交，我们需要避免
					if(!"page".equals(key)) {
						sb.append("	<input type='hidden' name='"+key+"' value='"+value+"' >");
					}
				}
			}
		}
		sb.append("</form>");
		
//		分页条
		sb.append("<ul class='pagination justify-content-center'>");
		sb.append("	<li class='page-item "+(pageBean.getPage() == 1 ? "disabled" : "")+"'><a class='page-link'");
		sb.append("	href='javascript:gotoPage(1)'>首页</a></li>");
		sb.append("	<li class='page-item "+(pageBean.getPage() == 1 ? "disabled" : "")+"'><a class='page-link'");
		sb.append("	href='javascript:gotoPage("+pageBean.getPreivousPage()+")'>&lt;</a></li>");// less than 小于号
//		sb.append("	<li class='page-item'><a class='page-link' href='#'>1</a></li>");
//		sb.append("	<li class='page-item'><a class='page-link' href='#'>2</a></li>");
		sb.append("	<li class='page-item active'><a class='page-link' href='#'>"+pageBean.getPage()+"</a></li>");
		sb.append("	<li class='page-item "+(pageBean.getPage() == pageBean.getMaxPage() ? "disabled" : "")+"'><a class='page-link' href='javascript:gotoPage("+pageBean.getNextPage()+")'>&gt;</a></li>");
		sb.append("	<li class='page-item "+(pageBean.getPage() == pageBean.getMaxPage() ? "disabled" : "")+"'><a class='page-link' href='javascript:gotoPage("+pageBean.getMaxPage()+")'>尾页</a></li>");
		sb.append("	<li class='page-item go-input'><b>到第</b><input class='page-link'");
		sb.append("	type='text' id='skipPage' name='' /><b>页</b></li>");
		sb.append("	<li class='page-item go'><a class='page-link'");
		sb.append("	href='javascript:skipPage()'>确定</a></li>");
		sb.append("	<li class='page-item'><b>共"+pageBean.getTotal()+"条</b></li>");
		sb.append("</ul>");
		
//		分页执行的JS代码
		sb.append("<script type='text/javascript'>");
		sb.append("	function gotoPage(page) {");
		sb.append("		document.getElementById('pageBeanForm').page.value = page;");
		sb.append("		document.getElementById('pageBeanForm').submit();");
		sb.append("	}");
		sb.append("	function skipPage() {");
		sb.append("		var page = document.getElementById('skipPage').value;");
		sb.append("		if (!page || isNaN(page) || parseInt(page) < 1 || parseInt(page) > "+pageBean.getMaxPage()+") {");
		sb.append("			alert('请输入1~"+pageBean.getMaxPage()+"的数字');");
		sb.append("			return;");
		sb.append("		}");
		sb.append("		gotoPage(page);");
		sb.append("	}");
		sb.append("</script>");
		
		return sb.toString();
	}
}

2.4.8 引入tld标签库

kissship.tld：

<?xml version="1.0" encoding="UTF-8" ?>

<taglib xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-jsptaglibrary_2_0.xsd"
    version="2.0">
    
  <description>kissship 1.1 core library</description>
  <display-name>kissship core</display-name>
  <tlib-version>1.1</tlib-version>
  <short-name>kissship</short-name>
  <uri>http://jsp.veryedu.cn</uri>
  
  
  <tag>
    <name>page</name>
    <tag-class>com.Kissship.tag.PageTag</tag-class>
    <body-content>JSP</body-content>
    <attribute>
        <name>pageBean</name>
        <required>true</required>
        <rtexprvalue>true</rtexprvalue>
    </attribute>
  </tag>
  
</taglib>

2.4.9 编写controller类

MusicController：

package com.Kissship.web;

import com.Kissship.biz.MusicBiz;
import com.Kissship.model.Music;
import com.Kissship.utils.PageBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletRequest;
import java.util.List;

/**
 * @author Kissship
 * @site www.Kissship.com
 * @company xxx公司
 * @create 2023-09-08-15:15
 */
@Controller
@RequestMapping("/mic")
public class MusicController {
    @Autowired
    private MusicBiz musicBiz;

    // 增
    @RequestMapping("/add")
    public String add(Music music, HttpServletRequest Request) {
        int i = musicBiz.insertSelective(music);
        return "redirect:list";
    }

    // 删
    @RequestMapping("/del/{bid}")
    public String del(@PathVariable("bid")Integer bid) {
        musicBiz.deleteByPrimaryKey(bid);
        return "redirect:/mic/list";
    }

    // 改
    @RequestMapping("/edit")
    public String edit(Music music, HttpServletRequest Request) {
        musicBiz.updateByPrimaryKeySelective(music);
        return "redirect:list";
    }

    // 查
    @RequestMapping("/list")
    public String list(Music music, HttpServletRequest Request) {
        //music是用来接受前台传递后台的参数
        PageBean pageBean = new PageBean();
        pageBean.setRequest(Request);
        List<Music> music1 = musicBiz.listPager(music, pageBean);
        Request.setAttribute("lst", music1);
        Request.setAttribute("pageBean", pageBean);
        //WEB-INF/jsp/mic/list.jsp
        return "mic/list";
    }

    //数据回显
    @RequestMapping("/preSave")
    public String preSave(Music music, Model model) {
        if (music != null && music.getMid() != null && music.getMid() != 0) {
            Music m = musicBiz.selectByPrimaryKey(music.getMid());
            model.addAttribute("c",m);
        }
        return "mic/edit";
    }
}

到此我们的后台代码编写完成了，接下来就是前端代码的编写。 

2.5 前台代码

2.5.1 主页面编写

作用：展示数据进行一系列操作。

list.jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8"%>
<%@ taglib uri="http://jsp.veryedu.cn" prefix="z"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <link
            href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.5.0/css/bootstrap.css"
            rel="stylesheet">
    <script
            src="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.5.0/js/bootstrap.js"></script>
    <title>JayChou歌单列表</title>
    <style type="text/css">
        .page-item input {
            padding: 0;
            width: 40px;
            height: 100%;
            text-align: center;
            margin: 0 6px;
        }

        .page-item input, .page-item b {
            line-height: 38px;
            float: left;
            font-weight: 400;
        }

        .page-item.go-input {
            margin: 0 10px;
        }
    </style>
</head>
<body>
<form class="form-inline"
      action="${pageContext.request.contextPath }/mic/list" method="post">
    <div class="form-group mb-2">
        <input type="text" class="form-control-plaintext" name="mname"
               placeholder="请输入歌曲名称">
        <!-- 			<input name="rows" value="20" type="hidden"> -->
        <!-- 不想分页 -->
<%--        <input name="pagination" value="false" type="hidden">--%>
    </div>
    <button type="submit" class="btn btn-primary mb-2">查询</button>
    <a class="btn btn-primary mb-2" href="${pageContext.request.contextPath }/mic/preSave">新增</a>
</form>

<table class="table table-striped">
    <thead>
    <tr>
        <th scope="col">歌曲编号</th>
        <th scope="col">歌曲名称</th>
        <th scope="col">歌曲专辑</th>
        <th scope="col">歌曲歌词</th>
        <th scope="col">歌曲图片</th>
    </tr>
    </thead>
    <tbody>
    <c:forEach  var="b" items="${lst }">
        <tr>
            <td>${b.mid }</td>
            <td>${b.mname }</td>
            <td>${b.mtype }</td>
            <td>${b.minfo }</td>
            <td>${b.mpic }</td>
            <td>
                <a href="${pageContext.request.contextPath }/mic/preSave?mid=${b.mid}">修改</a>
                <a href="${pageContext.request.contextPath }/mic/del/${b.mid}">删除</a>
            </td>
        </tr>
    </c:forEach>
    </tbody>
</table>
<!-- 这一行代码就相当于前面分页需求前端的几十行了 -->
<z:page pageBean="${pageBean }"></z:page>
${pageBean }
</body>
</html>

 2.5.2 修改界面编写

作用：操作数据。

edit.jsp：

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>编辑歌单界面</title>
</head>
<body>
<form action="${pageContext.request.contextPath }/${empty c ? 'mic/add' : 'mic/edit'}" method="post">
    歌曲编号:<input type="text" name="mid" value="${c.mid }"><br>
    歌曲名称:<input type="text" name="mname" value="${c.mname }"><br>
    歌曲专辑:<input type="text" name="mtype" value="${c.mtype }"><br>
    歌曲歌词:<input type="text" name="minfo" value="${c.minfo }"><br>
    歌曲图片:<input type="text" name="mpic" value="${c.mpic }"><br>
    <input type="submit">
</form>
</body>
</html>

三、展示效果

控制台效果：

 主页增删改查展示效果：

四、实战SpringMVC增删改查的收获

1. 熟悉SpringMVC框架：通过实践，可以更深入地理解SpringMVC框架的工作原理和核心概念，如控制器、视图解析器、数据绑定等。

2. 掌握请求处理和数据交互：实践中的增删改查操作涉及到请求处理和数据库数据交互，可以加深对请求的处理方式和数据库操作的理解。

3. 强化编程技能：实战中需要编写具体的代码实现增删改查功能，可以提高编程能力，尤其是对Java和SpringMVC的理解和熟练度。

4. 学习最佳实践：通过实践，可以学习到SpringMVC增删改查的最佳实践，包括使用合适的设计模式、优化数据库查询性能、错误处理等方面的经验。

5. 增加项目经验：实战增删改查可以让您在实际项目中积累经验，对项目的整体流程和开发周期有更深入的认识。

6. 提升自信心：通过实际操作和实践，可以提高对SpringMVC增删改查功能的自信心，为日后更复杂的项目开发打下基础。

请注意，SpringMVC是一个开源框架，通过参与实战项目可以更好地理解和应用它。同时，实践中也会遇到挑战和问题，但通过解决问题和学习，可以不断进步和成长。

最后实战SpringMVC之CRUD就到这里，祝大家在敲代码的路上一路通畅!

感谢大家的观看 !

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