#因为项目中需要导入一些信息,但是这些信息比较不常见,且在项目字典数据中维护有这些数据,所以在导出模板的时候,把这些数据一并导出,可以减少用户的编写,避免在导入的时候因为数据错误,发生一些业务问题
直接开始
一、首先引入依赖 easyexcel依赖
<!--easyexcel依赖-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>easyexcel</artifactId>
<version>2.2.10</version>
</dependency>
二、创建自定义注解
import java.lang.annotation.*;
/**
* 标注导出的列为下拉框类型,并为下拉框设置内容
*/
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.FIELD)
public @interface ExcelSelected {
/**
* 固定下拉内容
*/
String[] source() default {};
/**
* 动态下拉内容
*/
Class<? extends ExcelDynamicSelect>[] sourceClass() default {};
/**
* 设置下拉框的起始行,默认为第二行
*/
int firstRow() default 1;
/**
* 设置下拉框的结束行,默认为最后一行
*/
int lastRow() default 0x10000;
}
三、解析自定义注解接口
public interface ExcelDynamicSelect {
/**
* 获取动态生成的下拉框可选数据
* @return 动态生成的下拉框可选数据
*/
String[] getSource();
}
四、创建一个实体类,(这边以我项目内的演示)
import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.annotation.write.style.ColumnWidth;
import com.alibaba.excel.annotation.write.style.ContentRowHeight;
import com.alibaba.excel.annotation.write.style.HeadRowHeight;
import lombok.Data;
import org.springblade.basicdata.service.impl.DeptTemplateServiceImpl;
import org.springblade.basicdata.service.impl.SchoolTemplateServiceImpl;
import org.springblade.basicdata.service.impl.StationlateServiceImpl;
import org.springblade.basicdata.service.impl.ZgTypeslateServiceImpl;
import java.io.Serializable;
@Data
@HeadRowHeight(20)
@ContentRowHeight(18)
public class TeacherExcel implements Serializable {
private static final long serialVersionUID = 1L;
/**
* 职工编号
*/
@ExcelProperty(index = 0, value = "职工编号")
@ColumnWidth(20)
private String no;
/**
* 姓名
*/
@ExcelProperty(index = 1, value = "姓名")
@ColumnWidth(30)
private String name;
/**
* 身份证
*/
@ExcelProperty(index = 2, value = "身份证号")
@ColumnWidth(25)
private String idCard;
/**
* 电话
*/
@ExcelProperty(index = 3, value = "联系电话")
@ColumnWidth(15)
private String phone;
/**
* 学校id
*/
//需要自定义实现 SchoolTemplateServiceImpl,下面有具体的实现方式
@ExcelSelected(sourceClass = SchoolTemplateServiceImpl.class)
@ExcelProperty(index = 4, value = "校区")
@ColumnWidth(45)
private String schoolName;
/**
* 部门
*/
//需要自定义实现 DeptTemplateServiceImpl,下面有具体的实现方式
@ExcelSelected(sourceClass = DeptTemplateServiceImpl.class)
@ExcelProperty(index = 5, value = "部门")
@ColumnWidth(45)
private String bumenName;
/**
* 岗位类别
*/
//需要自定义实现 StationlateServiceImpl,下面有具体的实现方式
@ExcelSelected(sourceClass = StationlateServiceImpl.class)
@ExcelProperty(index = 6, value = "岗位类别")
@ColumnWidth(15)
private String station;
/**
* 职工类型
*/
//需要自定义实现 ZgTypeslateServiceImpl,下面有具体的实现方式
@ExcelSelected(sourceClass = ZgTypeslateServiceImpl.class)
@ExcelProperty(index = 7, value = "职工类型")
@ColumnWidth(15)
private String zhigongleibie;
/**
* 备注
*/
@ExcelProperty(index = 8, value = "备注")
@ColumnWidth(15)
private String remarks;
}
五、重点是以下的代码
1、以岗位类型为例,展示数据的实现方式
创建StationlateServiceImpl实现类,实现方法 为我自己的业务需求,你们可以根据你们的情况去修改,这边返回给注解的是一个字符串的数组,也就是需要导出的下拉选数据
import java.util.List;
import java.util.stream.Collectors;
/**
* 岗位类别下拉选数据实现类
*/
public class StationlateServiceImpl implements ExcelDynamicSelect {
private static IDictClient dictClient;
static {
dictClient = SpringUtil.getBean(IDictClient.class);
}
@Override
public String[] getSource() {
R<List<Dict>> dictClientList =
dictClient.getList(DictEnum.POST_TYPE.getName());
if(Func.isNotEmpty(dictClientList) && dictClientList.getCode() == 200){
if(Func.isNotEmpty(dictClientList.getData())){
return Func.toStrArray(dictClientList.getData().stream().map(Dict::getDictValue).collect(Collectors.joining(",")));
}
}
return new String[0];
}
}
Func.toStrArray方法就是讲给定的逗号拼接的字符串转为字符串数组,这个百度一下,一大堆文章来源:https://www.toymoban.com/news/detail-774185.html
六、EasyExcelUtil工具类
import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.write.metadata.WriteSheet;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
@Slf4j
public class EasyExcelUtil {
/**
* 创建即将导出的sheet页(sheet页中含有带下拉框的列)
* @param head 导出的表头信息和配置
* @param sheetNo sheet索引
* @param sheetName sheet名称
* @param <T> 泛型
* @return sheet页
*/
public static <T> WriteSheet writeSelectedSheet(Class<T> head, Integer sheetNo, String sheetName) {
Map<Integer, ExcelSelectedResolve> selectedMap = resolveSelectedAnnotation(head);
return EasyExcel.writerSheet(sheetNo, sheetName)
.head(head)
.registerWriteHandler(new SelectedSheetWriteHandler(selectedMap))
.build();
}
/**
* 解析表头类中的下拉注解
* @param head 表头类
* @param <T> 泛型
* @return Map<下拉框列索引, 下拉框内容> map
*/
private static <T> Map<Integer, ExcelSelectedResolve> resolveSelectedAnnotation(Class<T> head) {
Map<Integer, ExcelSelectedResolve> selectedMap = new HashMap<>();
// getDeclaredFields(): 返回全部声明的属性;getFields(): 返回public类型的属性
Field[] fields = head.getDeclaredFields();
for (int i = 0; i < fields.length; i++){
Field field = fields[i];
// 解析注解信息
ExcelSelected selected = field.getAnnotation(ExcelSelected.class);
ExcelProperty property = field.getAnnotation(ExcelProperty.class);
if (selected != null) {
ExcelSelectedResolve excelSelectedResolve = new ExcelSelectedResolve();
String[] source = excelSelectedResolve.resolveSelectedSource(selected);
if (source != null && source.length > 0){
excelSelectedResolve.setSource(source);
excelSelectedResolve.setFirstRow(selected.firstRow());
excelSelectedResolve.setLastRow(selected.lastRow());
if (property != null && property.index() >= 0){
selectedMap.put(property.index(), excelSelectedResolve);
} else {
selectedMap.put(i, excelSelectedResolve);
}
}
}
}
return selectedMap;
}
public static boolean isIDNumber(String IDNumber) {
if (IDNumber == null || "".equals(IDNumber)) {
return false;
}
// 定义判别用户身份证号的正则表达式(15位或者18位,最后一位可以为字母)
String regularExpression = "(^[1-9]\\d{5}(18|19|20)\\d{2}((0[1-9])|(10|11|12))(([0-2][1-9])|10|20|30|31)\\d{3}[0-9Xx]$)|" +
"(^[1-9]\\d{5}\\d{2}((0[1-9])|(10|11|12))(([0-2][1-9])|10|20|30|31)\\d{3}$)";
//假设18位身份证号码:41000119910101123X 410001 19910101 123X
//^开头
//[1-9] 第一位1-9中的一个 4
//\\d{5} 五位数字 10001(前六位省市县地区)
//(18|19|20) 19(现阶段可能取值范围18xx-20xx年)
//\\d{2} 91(年份)
//((0[1-9])|(10|11|12)) 01(月份)
//(([0-2][1-9])|10|20|30|31)01(日期)
//\\d{3} 三位数字 123(第十七位奇数代表男,偶数代表女)
//[0-9Xx] 0123456789Xx其中的一个 X(第十八位为校验值)
//$结尾
//假设15位身份证号码:410001910101123 410001 910101 123
//^开头
//[1-9] 第一位1-9中的一个 4
//\\d{5} 五位数字 10001(前六位省市县地区)
//\\d{2} 91(年份)
//((0[1-9])|(10|11|12)) 01(月份)
//(([0-2][1-9])|10|20|30|31)01(日期)
//\\d{3} 三位数字 123(第十五位奇数代表男,偶数代表女),15位身份证不含X
//$结尾
boolean matches = IDNumber.matches(regularExpression);
//判断第18位校验值
if (matches) {
if (IDNumber.length() == 18) {
try {
char[] charArray = IDNumber.toCharArray();
//前十七位加权因子
int[] idCardWi = {7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2};
//这是除以11后,可能产生的11位余数对应的验证码
String[] idCardY = {"1", "0", "X", "9", "8", "7", "6", "5", "4", "3", "2"};
int sum = 0;
for (int i = 0; i < idCardWi.length; i++) {
int current = Integer.parseInt(String.valueOf(charArray[i]));
int count = current * idCardWi[i];
sum += count;
}
char idCardLast = charArray[17];
int idCardMod = sum % 11;
if (idCardY[idCardMod].toUpperCase().equals(String.valueOf(idCardLast).toUpperCase())) {
return true;
} else {
return false;
}
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
return false;
}
return matches;
}
public static boolean isMobile(String phone){
Pattern p = null;
Matcher m = null;
boolean b = false;
// 验证手机号
String s2="^[1](([3|5|6|7|8|9][\\d])|([4][4,5,6,7,8,9])|([6][2,5,6,7])|([7][^9])|([9][1,8,9]))[\\d]{8}$";
if(StringUtils.isNotBlank(phone)){
p = Pattern.compile(s2);
m = p.matcher(phone);
b = m.matches();
}
return b;
}
}
七、SelectedSheetWriteHandler
import com.alibaba.excel.write.handler.SheetWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteWorkbookHolder;
import lombok.AllArgsConstructor;
import lombok.Data;
import org.apache.poi.ss.usermodel.DataValidation;
import org.apache.poi.ss.usermodel.DataValidationConstraint;
import org.apache.poi.ss.usermodel.DataValidationHelper;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.util.CellRangeAddressList;
import java.util.Map;
@Data
@AllArgsConstructor
public class SelectedSheetWriteHandler implements SheetWriteHandler {
private final Map<Integer, ExcelSelectedResolve> selectedMap;
/**
* 设置阈值,避免生成的导入模板下拉值获取不到,可自行设置数量大小
*/
private static final Integer LIMIT_NUMBER = 25;
/**
* Called before create the sheet
*/
@Override
public void beforeSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {
}
/**
* Called after the sheet is created
*/
@Override
public void afterSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {
// 这里可以对cell进行任何操作
Sheet sheet = writeSheetHolder.getSheet();
DataValidationHelper helper = sheet.getDataValidationHelper();
selectedMap.forEach((k, v) -> {
// 设置下拉列表的行: 首行,末行,首列,末列
CellRangeAddressList rangeList = new CellRangeAddressList(v.getFirstRow(), v.getLastRow(), k, k);
// 如果下拉值总数大于25,则使用一个新sheet存储,避免生成的导入模板下拉值获取不到
if (v.getSource().length > LIMIT_NUMBER) {
//定义sheet的名称
//1.创建一个隐藏的sheet 名称为 hidden + k
String sheetName = "hidden" + k;
Workbook workbook = writeWorkbookHolder.getWorkbook();
Sheet hiddenSheet = workbook.createSheet(sheetName);
for (int i = 0, length = v.getSource().length; i < length; i++) {
// 开始的行数i,列数k
hiddenSheet.createRow(i).createCell(k).setCellValue(v.getSource()[i]);
}
Name category1Name = workbook.createName();
category1Name.setNameName(sheetName);
String excelLine = getExcelLine(k);
// =hidden!$H:$1:$H$50 sheet为hidden的 H1列开始H50行数据获取下拉数组
String refers = "=" + sheetName + "!$" + excelLine + "$1:$" + excelLine + "$" + (v.getSource().length + 1);
// 将刚才设置的sheet引用到你的下拉列表中
DataValidationConstraint constraint = helper.createFormulaListConstraint(refers);
DataValidation dataValidation = helper.createValidation(constraint, rangeList);
writeSheetHolder.getSheet().addValidationData(dataValidation);
// 设置存储下拉列值得sheet为隐藏
int hiddenIndex = workbook.getSheetIndex(sheetName);
if (!workbook.isSheetHidden(hiddenIndex)) {
workbook.setSheetHidden(hiddenIndex, true);
}
}
// 设置下拉列表的值
DataValidationConstraint constraint = helper.createExplicitListConstraint(v.getSource());
// 设置约束
DataValidation validation = helper.createValidation(constraint, rangeList);
// 阻止输入非下拉选项的值
validation.setErrorStyle(DataValidation.ErrorStyle.STOP);
validation.setShowErrorBox(true);
// validation.setSuppressDropDownArrow(true);
validation.createErrorBox("提示", "请输入下拉选项中的内容");
sheet.addValidationData(validation);
});
}
/**
* 返回excel列标A-Z-AA-ZZ
*
* @param num 列数
* @return java.lang.String
*/
private String getExcelLine(int num) {
String line = "";
int first = num / 26;
int second = num % 26;
if (first > 0) {
line = (char) ('A' + first - 1) + "";
}
line += (char) ('A' + second) + "";
return line;
}
}
八、ExcelDynamicSelect
public interface ExcelDynamicSelect {
/**
* 获取动态生成的下拉框可选数据
* @return 动态生成的下拉框可选数据
*/
String[] getSource();
}
九、ExcelSelectedResolve
@Data
@Slf4j
public class ExcelSelectedResolve {
/**
* 下拉内容
*/
private String[] source;
/**
* 设置下拉框的起始行,默认为第二行
*/
private int firstRow;
/**
* 设置下拉框的结束行,默认为最后一行
*/
private int lastRow;
public String[] resolveSelectedSource(ExcelSelected excelSelected) {
if (excelSelected == null) {
return null;
}
// 获取固定下拉框的内容
String[] source = excelSelected.source();
if (source.length > 0) {
return source;
}
// 获取动态下拉框的内容
Class<? extends ExcelDynamicSelect>[] classes = excelSelected.sourceClass();
if (classes.length > 0) {
try {
ExcelDynamicSelect excelDynamicSelect = classes[0].newInstance();
String[] dynamicSelectSource = excelDynamicSelect.getSource();
if (dynamicSelectSource != null && dynamicSelectSource.length > 0) {
return dynamicSelectSource;
}
} catch (InstantiationException | IllegalAccessException e) {
log.error("解析动态下拉框数据异常", e);
}
}
return null;
}
}
十、导出接口
/** 教师入职Excel模板导出 */
@ApiLog("教师入职Excel模板导出")
@GetMapping("export-template")
@ApiOperationSupport(order = 7)
@ApiOperation(value = "教师入职Excel模板导出")
public void exportTeacher(HttpServletResponse response, HttpServletRequest request) {
String filename = "教师入职信息导入模板";
try {
String userAgent = request.getHeader("User-Agent");
if (userAgent.contains("MSIE") || userAgent.contains("Trident")) {
// 针对IE或者以IE为内核的浏览器:
filename = java.net.URLEncoder.encode(filename, "UTF-8");
} else {
// 非IE浏览器的处理:
filename = new String(filename.getBytes(StandardCharsets.UTF_8), StandardCharsets.ISO_8859_1);
}
response.setContentType("application/vnd.ms-excel");
response.setHeader("Content-disposition", String.format("attachment; filename=\"%s\"", filename + Func.formatDateTime(new Date()) + ".xlsx"));
response.setHeader("Cache-Control", "no-cache");
response.setHeader("Pragma", "no-cache");
response.setDateHeader("Expires", -1);
response.setCharacterEncoding("UTF-8");
ExcelWriter excelWriter = EasyExcel.write(response.getOutputStream()).build();
WriteSheet writeSheet = EasyExcelUtil.writeSelectedSheet(TeacherExcel.class, 0, "教师入职信息数据表");
excelWriter.write(new ArrayList<String>(), writeSheet);
excelWriter.finish();
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
十一、导出效果图
文章来源地址https://www.toymoban.com/news/detail-774185.html
完结,有问题欢迎指正,QQ 781999475
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