使用Apache.POI中HSSFWorkbook导出到Excel，具体内容如下所示：

1.引入Poi依赖（3.12）

依赖如下：

<dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>3.12</version></dependency>

2.创建实体类（User.java）

package com.kd.nm.entity.pojo;/** * 实体类（User） * * author 小辰哥哥 */public class User { // 用户编号 private String userNo; // 用户名称 private String userName; // 年龄 private String age; // 无参构造 public User() { } // 有参构造 public User(String userNo, String userName, String age) { this.userNo = userNo; this.userName = userName; this.age = age; } // get与set方法进行封装 public String getUserNo() { return userNo; } public void setUserNo(String userNo) { this.userNo = userNo; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public String getAge() { return age; } public void setAge(String age) { this.age = age; } // 重新toString方法 @Override public String toString() { return "User{" + "userNo='" + userNo + '\'' + ", userName='" + userName + '\'' + ", age='" + age + '\'' + '}'; }}

3.Excel相关工具类（ExcelUtil、ReflectUtil）

package com.kd.nm.util;import java.util.ArrayList;import java.util.List;import java.util.Map;import org.apache.poi.hssf.usermodel.*;/** * Description : Excel相关工具类 * * @author: 小辰哥哥 * */public class ExcelUtil { /** * 生成excel表格 * @param heads 表头内容 * @param data 数据内容 * @return */ public static HSSFWorkbook creatExcel(Map<String, String> heads, List data) { // 声明一个工作薄 HSSFWorkbook workbook = new HSSFWorkbook(); // 生成一个表格 HSSFSheet sheet = workbook.createSheet(); // 生成标题行样式 HSSFCellStyle headStyle = creatStyle(workbook, (short) 14); // 生成表格内容样式 HSSFCellStyle bodyStyle = creatStyle(workbook, (short) 10); // 标题元素 List<String> keys = new ArrayList<String>(heads.keySet()); // 像素单位 short px = 1000; // 设置列宽 for (int columnIndex = 0; columnIndex < keys.size(); columnIndex++) { sheet.setColumnWidth(columnIndex, 6 * px); } // 生成表格 for (int rowNum = 0; rowNum <= data.size(); rowNum++) { // 创建行 HSSFRow row = sheet.createRow(rowNum); for (int cellNum = 0; cellNum < keys.size(); cellNum++) { // 创建列 HSSFCell cell = row.createCell(cellNum); // 标题 if (rowNum == 0) { cell.setCellStyle(headStyle); cell.setCellValue(heads.get(keys.get(cellNum))); } else { // 内容 cell.setCellStyle(bodyStyle); // 通过反射获取 cell.setCellValue(ReflectUtil.getValue(keys.get(cellNum), data.get(rowNum - 1))); } } } return workbook; } /** * 生成样式 * @param workbook * @param size * @return */ public static HSSFCellStyle creatStyle(HSSFWorkbook workbook, short size) { HSSFCellStyle style = workbook.createCellStyle(); style.setAlignment((HSSFCellStyle.ALIGN_CENTER)); style.setVerticalAlignment((HSSFCellStyle.VERTICAL_CENTER)); HSSFFont font = workbook.createFont(); font.setFontHeightInPoints(size); font.setFontName("微软雅黑"); style.setFont(font); style.setBorderBottom(HSSFCellStyle.BORDER_THIN); style.setBorderTop(HSSFCellStyle.BORDER_THIN); style.setBorderRight(HSSFCellStyle.BORDER_THIN); style.setBorderLeft(HSSFCellStyle.BORDER_THIN); return style; }}package com.kd.nm.util;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.util.ReflectionUtils;import java.beans.PropertyDescriptor;import java.lang.reflect.Method;/** * 反射工具包 * * @author: 小辰哥哥 */public class ReflectUtil { private static final Logger logger = LoggerFactory.getLogger(ReflectUtil.class); public static String getValue(String key, Object obj) { String value = ""; try { // 获取当前属性 PropertyDescriptor pd = new PropertyDescriptor(key, obj.getClass()); // 获取get方法 Method getMd = pd.getReadMethod(); value = getMd.invoke(obj).toString(); } catch (Exception e) { logger.error("获取内容失败！"); e.printStackTrace(); } return value; } public static void setValue(String key, String value, Object obj) { try { // 获取当前属性 PropertyDescriptor pd = new PropertyDescriptor(key, obj.getClass()); // 获取set方法 Method writeMd = pd.getWriteMethod(); writeMd.invoke(obj, value); } catch (Exception e) { logger.error("设置内容失败！"); e.printStackTrace(); } }}

4.后端控制器代码

@RequestMapping(value = "/exportExcel",method = RequestMethod.GET,produces = "application/json") public void exportExcel(HttpServletResponse httpServletResponse) throws IOException { // 表头内容（可在前端设置，通过参数传递进来） Key是实体类的属性值，value是表头的lable Map<String,String> head = new HashMap<>(); head.put("userNo","用户编号"); head.put("userName","用户名称"); head.put("age","年龄"); // 表格数据内容,模拟数据库查询出来的数据 List<User> data = new ArrayList<>(); data.add(new User("1","小辰哥哥","18")); data.add(new User("2","小猪妹妹","18")); data.add(new User("3","大猪哥哥","18")); // 生成工作薄 HSSFWorkbook hssfWorkbook = ExcelUtil.creatExcel(head, data); // 定义文件名 String fileName = "导出Excel表格"; httpServletResponse.setHeader("Cache-Control", "max-age=0"); httpServletResponse.setContentType("application/vnd.ms-excel"); httpServletResponse.addHeader("Content-disposition", "attachment;filename=" + new String(fileName.getBytes("gb2312"), "ISO-8859-1") + ".xls"); OutputStream outputStream = httpServletResponse.getOutputStream(); hssfWorkbook.write(outputStream); outputStream.flush(); outputStream.close(); }

5.访问映射地址

接口访问：

http://localhost:9090/FaultTreatment/api/standard/exportExcel

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