Java Excel导出 支持2007 xlsx, 2003 xls 基本用法
1. Maven包
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.10-FINAL</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.10-FINAL</version>
</dependency>
2. 数据库 test 和数据表 user及相关测试数据
CREATE DATABASE `test` DEFAULT CHARSET utf8;
CREATE TABLE `user` (
`id` int(20) NOT NULL AUTO_INCREMENT,
`name` varchar(20) DEFAULT NULL,
`age` int(20) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=0 DEFAULT CHARSET=utf8;
INSERT INTO `user` VALUES (1, '工作人员1', 21);
INSERT INTO `user` VALUES (2, '工作人员2', 22);
INSERT INTO `user` VALUES (3, '工作人员3', 23);
3. User.java(Entity)与 user数据表字段对应
import java.io.Serializable;
public class User implements Serializable {
private static final long serialVersionUID = 8755803182642361875L;
private Long id;
private Long age;
private String name;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public Long getAge() {
return age;
}
public void setAge(Long age) {
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
4. DAO(Data Access Object)数据访问接口 UserDao.java和实现类 UserDaoImpl.java
/**
* User的数据访问接口 UserDao.java
*/
import com.test.web2.entity.User;
import java.util.List;
public interface UserDao {
List<User> getList();
}
/**
* 实现类 UserDaoImpl.java
*/
import com.test.web2.dao.UserDao;
import com.test.web2.entity.User;
import org.apache.ibatis.session.SqlSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository
public class UserDaoImpl implements UserDao {
@Autowired
private SqlSession sqlSession;
static final String MAPPER = "com.test.web2.UserMapper.";
@Override
public List<User> getList() {
return sqlSession.selectList(MAPPER + "getList");
}
}
5. UserMapper.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.test.web2.UserMapper">
<select id="getList" resultType="com.test.web2.entity.User">
SELECT `id`,`age`,`name` FROM `user` ORDER BY `id` ASC
</select>
</mapper>
6. ExcelUtil.java相关工具类
import org.apache.poi.hssf.usermodel.*;
public class ExcelUtil {
public static HSSFWorkbook getHSSFWorkbook(String sheetName, String []title, String [][] values, HSSFWorkbook wb) {
if (wb == null) {
wb = new HSSFWorkbook();
}
HSSFSheet sheet = wb.createSheet(sheetName);
HSSFRow row = sheet.createRow(0);
HSSFCellStyle style = wb.createCellStyle();
HSSFCell cell;
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
int tcount = title.length;
for (int i = 0;i < tcount;i++) {
cell = row.createCell(i);
cell.setCellValue(title[i]);
cell.setCellStyle(style);
}
int vcount1 = values.length;
for (int i = 0;i < vcount1;i++) {
row = sheet.createRow(i + 1);
int vcount2 = values[i].length;
for (int j = 0;j < vcount2;j++) {
row.createCell(j).setCellValue(values[i][j]);
}
}
return wb;
}
}
7. UserController.java(入口)
import com.test.web2.dao.UserDao;
import com.test.web2.entity.User;
import com.test.web2.util.ExcelUtil;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import javax.servlet.http.HttpServletResponse;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.List;
@Controller
public class UserController {
@Autowired
private UserDao userDao;
@RequestMapping("/exportUsers")
public void exportUsers(HttpServletResponse response) {
/**
* 获取用户列表
* */
final List<User> listData = userDao.getList();
/** Excel SheetName名称*/
final String sheetName = "用户明细表";
/** Excel标题*/
final String[] title = {"编号", "称呼", "年龄"};
/** 今天日期(用于文件名)*/
final String date = DateTimeFormatter.ofPattern("yyyy-MM-dd").format(LocalDateTime.now());
/** Excel文件名*/
final String fileName = sheetName + "-" + date + ".xls";
/** 数据行数*/
final Integer dataCount = listData.size();
final String[][] content = new String[dataCount][3];
for (int i = 0; i < dataCount; i++) {
final User user = listData.get(i);
content[i][0] = user.getId().toString();
content[i][1] = user.getName();
content[i][2] = user.getAge().toString();
}
/** 创建HSSFWorkbook*/
final HSSFWorkbook wb = ExcelUtil.getHSSFWorkbook(sheetName, title, content, null);
/** 响应到客户端*/
try {
this.setResponseHeader(fileName, response);
OutputStream os = response.getOutputStream();
wb.write(os);
os.flush();
os.close();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 发送响应流方法
* */
public void setResponseHeader(String fileName, final HttpServletResponse response) {
try {
try {
fileName = new String(fileName.getBytes(),"ISO8859-1");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
response.setContentType("application/octet-stream;charset=ISO8859-1");
response.setHeader("Content-Disposition", "attachment;filename="+ fileName);
response.addHeader("Pargam", "no-cache");
response.addHeader("Cache-Control", "no-cache");
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
调用导出 Excel接口
http://127.0.0.1:8080/exportUsers
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