springboot + mybatis + poi实现报表导出

话不多说，直接上代码

数据库表如下

代码结构如下

controller

 

package com.yuanyuan.smp.controller;

import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.yuanyuan.smp.entity.User;
import com.yuanyuan.smp.service.IUserService;
import com.yuanyuan.smp.utils.FileUtil;

@RestController
public class UserController {
	
	@Autowired
	private IUserService userService;
	
	@RequestMapping("/")
	public String hello() {
		return "hello";
	}
	
	@RequestMapping("/exportExcel")
	public void exportExcel(HttpServletRequest request, HttpServletResponse response) {
		List userList = userService.selectAll();
		// 创建工作簿
		HSSFWorkbook workbook = new HSSFWorkbook();
		// 创建表
		HSSFSheet sheet = workbook.createSheet("用户信息");
		// 创建行
		HSSFRow row = sheet.createRow(0);
		// 创建单元格样式
		HSSFCellStyle cellStyle = workbook.createCellStyle();
		// 表头
		String[] head = {"姓名", "年龄"};
		HSSFCell cell;
		// 设置表头
		for(int iHead=0; iHead

实体类

package com.yuanyuan.smp.entity;

import java.io.Serializable;

public class User implements Serializable{
    /**
	 * 
	 */
	private static final long serialVersionUID = 2895782870082326368L;

	private Integer userId;

    private String name;
    
    private Integer age;

    public Integer getUserId() {
        return userId;
    }

    public void setUserId(Integer userId) {
        this.userId = userId;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name == null ? null : name.trim();
    }

	public Integer getAge() {
		return age;
	}

	public void setAge(Integer age) {
		this.age = age;
	}
    
}

mapper

package com.yuanyuan.smp.mapper;

import java.util.List;

import com.yuanyuan.smp.entity.User;

public interface UserMapper {

    List selectAll();

}

mapper.xml

  
    
    
    
  
  
    user_id, name, age
  
  
    select 
    
    from user
  

Service

package com.yuanyuan.smp.service;

import java.util.List;

import com.yuanyuan.smp.entity.User;

public interface IUserService {
	
	List selectAll();

}

package com.yuanyuan.smp.service;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.yuanyuan.smp.entity.User;
import com.yuanyuan.smp.mapper.UserMapper;

@Service
public class UserService implements IUserService {
	
	@Autowired
	private UserMapper userMapper;

	@Override
	public List selectAll() {
		return userMapper.selectAll();
	}

}

utils

package com.yuanyuan.smp.utils;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;

import org.apache.poi.hssf.usermodel.HSSFWorkbook;

public class FileUtil {
	public static void createFile(HttpServletResponse response, HSSFWorkbook workbook) {
		// 设置文件名
	    String fileName ="用户信息";
	    try {
	    	// 捕获内存缓冲区的数据，转换成字节数组
	    	ByteArrayOutputStream out = new ByteArrayOutputStream();
	    	workbook.write(out);
	    	// 获取内存缓冲中的数据
	    	byte[] content = out.toByteArray();
	    	// 将字节数组转化为输入流
	    	InputStream in = new ByteArrayInputStream(content);
	    	//通过调用reset（）方法可以重新定位。         	
	    	response.reset();
	        // 如果文件名是英文名不需要加编码格式，如果是中文名需要添加"iso-8859-1"防止乱码
	        response.setHeader("Content-Disposition", "attachment; filename=" + new String((fileName + ".xls").getBytes(), "iso-8859-1"));
	        response.addHeader("Content-Length", "" + content.length);
	        response.setContentType("application/vnd.ms-excel;charset=UTF-8");       	
	        ServletOutputStream outputStream = response.getOutputStream();
	        BufferedInputStream bis = new BufferedInputStream(in);
	        BufferedOutputStream bos = new BufferedOutputStream(outputStream);    
	        byte[] buff = new byte[8192];
	        int bytesRead;
	        while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
	            bos.write(buff, 0, bytesRead);
	        }
	        bis.close();
	        bos.close();
	        outputStream.flush();
	        outputStream.close();
	    } catch (IOException e) {
	    	e.printStackTrace();
	    }
	}

}

启动类

package com.yuanyuan.smp;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan(basePackages= {"com.yuanyuan.smp.mapper"})
public class SmpApplication {
	
	public static void main(String[] args) {
		SpringApplication.run(SmpApplication.class, args);
	}

}

application.yml

server:
    port: 8088
    context-path: /
    tomcat:
        uri-encoding: UTF-8
spring:
    datasource:
        type: com.alibaba.druid.pool.DruidDataSource
        driverClassName: com.mysql.jdbc.Driver
        url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true
        username: root
        password: root
mybatis:
    mapper-locations: com.yuanyuan.smp.mapper/*.xml

pom.xml

  4.0.0
  com.yuanyuan.smp
  springboot-mybaits-poi
  0.0.1-SNAPSHOT
  
  
    org.springframework.boot
    spring-boot-starter-parent
    1.5.2.RELEASE
    
  

  
    UTF-8
    UTF-8
    1.8
  
  
  
        
        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
            1.3.0
        
        
         
            org.springframework.boot
            spring-boot-starter-jdbc
        
        
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
        
        
            mysql
            mysql-connector-java
        
        
            com.alibaba
            druid
            1.0.29
        
        
          com.alibaba
          fastjson
          1.2.32
        
        
            org.apache.poi
            poi
            3.15
        
        
            org.apache.poi
               poi-ooxml
               3.15
        
    
    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

运行main方法，访问接口http://localhost:8088/exportExcel，结果如下