Question

springmvc poi 导出word 复选框 怎么用

Answer 1

Apache POI是Apache软件基金会的开放源码函式库，POI提供API给Java程序对Microsoft Office格式档案读和写的功能。

这里的方法支持导出excel至项目所在服务器，或导出至客户端浏览器供用户下载，下面我把两个实例都放出来。

1.下载所需POI的jar包，并导入项目。

2.添加一个User类，用于存放用户实体，类中内容如下：

1 package com.mvc.po;
2
3 public class User {
4 private int id;
5 private String name;
6 private String password;
7 private int age;
8
9 public User() {
10
11 }
12
13 public User(int id, String name, String password, int age) {
14 this.id = id;
15 this.name = name;
16 this.password = password;
17 this.age = age;
18 }
19 public int getId() {
20 return id;
21 }
22 public void setId(int id) {
23 this.id = id;
24 }
25 public String getName() {
26 return name;
27 }
28 public void setName(String name) {
29 this.name = name;
30 }
31 public String getPassword() {
32 return password;
33 }
34 public void setPassword(String password) {
35 this.password = password;
36 }
37 public int getAge() {
38 return age;
39 }
40 public void setAge(int age) {
41 this.age = age;
42 }
43 }

3.添加一个UserController类，类中内容如下：

1 package com.mvc.controller;
2
3 import java.text.SimpleDateFormat;
4 import java.util.Date;
5
6 import javax.servlet.ServletOutputStream;
7 import javax.servlet.http.HttpServletResponse;
8
9 import org.springframework.stereotype.Controller;
10 import org.springframework.beans.factory.annotation.Autowired;
11 import org.springframework.web.bind.annotation.RequestMapping;
12 import org.springframework.web.bind.annotation.ResponseBody;
13
14 import com.mvc.po.User;
15 import com.mvc.service.UserService;
16
17 @Controller
18 public class UserController {
19
20 @Autowired
21 private UserService userService;
22
23 @RequestMapping("/export.do")
24 public @ResponseBody String export(HttpServletResponse response){
25 response.setContentType("application/binary;charset=UTF-8");
26 try{
27 ServletOutputStream out=response.getOutputStream();
28 String fileName=new String(("UserInfo "+ new SimpleDateFormat("yyyy-MM-dd").format(new Date())).getBytes(),"UTF-8");
29 response.setHeader("Content-disposition", "attachment; filename=" + fileName + ".xls");
30 String[] titles = { "用户编号", "用户姓名", "用户密码", "用户年龄" };
31 userService.export(titles, out);
32 return "success";
33 } catch(Exception e){
34 e.printStackTrace();
35 return "导出信息失败";
36 }
37 }
38 }

4.添加一个接口类UserService和实现类UserServiceImpl，类中内容如下：

1 package com.mvc.service;
2
3 import javax.servlet.ServletOutputStream;
4 import com.mvc.po.User;
5
6 public interface UserService {
7 public void export(String[] titles, ServletOutputStream out);
8 }

1 package com.mvc.service.impl;
2
3 import java.text.SimpleDateFormat;
4 import java.util.List;
5
6 import javax.servlet.ServletOutputStream;
7
8 import com.mvc.dao.UserDAO;
9 import com.mvc.po.User;
10 import com.mvc.service.UserService;
11
12 import org.apache.poi.hssf.usermodel.HSSFCell;
13 import org.apache.poi.hssf.usermodel.HSSFCellStyle;
14 import org.apache.poi.hssf.usermodel.HSSFRow;
15 import org.apache.poi.hssf.usermodel.HSSFSheet;
16 import org.apache.poi.hssf.usermodel.HSSFWorkbook;
17 import org.springframework.beans.factory.annotation.Autowired;
18 import org.springframework.stereotype.Service;
19
20 @Service
21 public class UserServiceImpl implements UserService {
22
23 @Autowired
24 private UserDAO userDAO;
25
26 @Override
27 public void export(String[] titles, ServletOutputStream out) {
28 try{
29 // 第一步，创建一个workbook，对应一个Excel文件
30 HSSFWorkbook workbook = new HSSFWorkbook();
31 // 第二步，在webbook中添加一个sheet,对应Excel文件中的sheet
32 HSSFSheet hssfSheet = workbook.createSheet("sheet1");
33 // 第三步，在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制short
34 HSSFRow hssfRow = hssfSheet.createRow(0);
35 // 第四步，创建单元格，并设置值表头 设置表头居中
36 HSSFCellStyle hssfCellStyle = workbook.createCellStyle();
37 //居中样式
38 hssfCellStyle.setAlignment(HSSFCellStyle.ALIGN_CENTER);
39
40 HSSFCell hssfCell = null;
41 for (int i = 0; i < titles.length; i++) {
42 hssfCell = hssfRow.createCell(i);//列索引从0开始
43 hssfCell.setCellValue(titles[i]);//列名1
44 hssfCell.setCellStyle(hssfCellStyle);//列居中显示
45 }
46
47 // 第五步，写入实体数据
48 List users = userDAO.query();
49
50 SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
51 if(users != null && !users.isEmpty()){
52 for (int i = 0; i < users.size(); i++) {
53 hssfRow = hssfSheet.createRow(i+1);
54 User user = users.get(i);
55
56 // 第六步，创建单元格，并设置值
57 int userid = 0;
58 if(user.getId() != 0){
59 userid = user.getId();
60 }
61 hssfRow.createCell(0).setCellValue(userid);
62 String username = "";
63 if(user.getName() != null){
64 username = user.getName();
65 }
66 hssfRow.createCell(1).setCellValue(username);
67 String password = "";
68 if(user.getPassword() != null){
69 password = user.getPassword();
70 }
71 hssfRow.createCell(2).setCellValue(password);
72 int age = 0;
73 if(user.getAge() != 0){
74 age = user.getAge();
75 }
76 hssfRow.createCell(3).setCellValue(age);
77 }
78 }
79
80 // 第七步，将文件输出到客户端浏览器
81 try {
82 workbook.write(out);
83 out.flush();
84 out.close();
85
86 } catch (Exception e) {
87 e.printStackTrace();
88 }
89 }catch(Exception e){
90 e.printStackTrace();
91 throw new Exception("导出信息失败！");
92 }
93 }
94 }

5.添加一个接口类UserDAO和实现类UserDAOImpl，类中内容如下：

1 package com.mvc.dao;
2
3 import java.util.List;
4 import com.mvc.po.User;
5
6 public interface UserDAO {
7 List query();
8 }

1 package com.mvc.dao.impl;
2
3 import java.util.List;
4 import java.sql.ResultSet;
5 import java.sql.SQLException;
6
7 import com.mvc.dao.UserDAO;
8 import com.mvc.po.User;
9
10 import org.springframework.stereotype.Repository;
11 import org.springframework.beans.factory.annotation.Autowired;
12 import org.springframework.jdbc.core.JdbcTemplate;
13 import org.springframework.jdbc.core.RowMapper;
14
15 @Repository
16 public class UserDAOImpl implements UserDAO {
17
18 @Autowired
19 private JdbcTemplate jdbcTemplate;
20
21 public List query() {
22 return this.jdbcTemplate.query("select * from student",
23 new RowMapper() {
24 public User mapRow(ResultSet rs, int arg1)
25 throws SQLException {
26 return new User(rs.getInt("sId"),
27 rs.getString("sName"), rs.getString("sPwd"), rs
28 .getInt("sAge"));
29 }
30 });
31 }
32 }

这样就完成了excel导出至客户端浏览器，当然有时候也会用到导出excel至服务器上。只需要对本文步骤4中的第七步文件输出方式进行修改，如下：

1 // 第七步，将文件存到指定位置
2 try {
3 FileOutputStream fileOutputStream = new FileOutputStream("C:/user.xls");//指定路径与名字和格式
4 workbook.write(fileOutputStream);//讲数据写出去
5 fileOutputStream.close();//关闭输出流
6 } catch (Exception e) {
7 e.printStackTrace();
8 }

然后去除controller类中的out参数设置就ok了。也可以看出其实两种方式只是最终保存方式不同，其他步骤是共通的。