SpringBoot实现数据库的读取导出到Excel表格（数据库查询Mybatis实现）

Controller层

package com.southgis.imap.maintain.controller;

import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import javax.servlet.http.HttpServletResponse;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.southgis.imap.maintain.service.sendMessage;

@RestController
public class ExcelController{

	@Autowired
	private sendMessage sendmessage;
	
	@RequestMapping("/Excel")
	public Object excelFind(HttpServletResponse response) {
		 XSSFWorkbook wb =this.sendmessage.show();
         String fileName = "Goods报表.xlsx";
         OutputStream outputStream =null;
         try {
             fileName = URLEncoder.encode(fileName,"UTF-8");
             //设置ContentType请求信息格式
             response.setContentType("application/vnd.ms-excel");
             response.setHeader("Content-disposition", "attachment;filename=" + fileName);
             outputStream = response.getOutputStream();
             wb.write(outputStream);
             outputStream.flush();
             outputStream.close();
         } catch (UnsupportedEncodingException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }
         return "success";
	}
}

Service层
（1）接口（sendMessage.java）

package com.southgis.imap.maintain.service;

import org.apache.poi.xssf.usermodel.XSSFWorkbook;

public interface sendMessage {
	
	XSSFWorkbook show();
}

（2）实现类（SendMessageImpl.java）

package com.southgis.imap.maintain.service.impl;

import java.util.Calendar;
import java.util.Date;
import java.util.List;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import com.southgis.imap.maintain.entity.SendMessage;
import com.southgis.imap.maintain.mapper.SendMessageMapper;
import com.southgis.imap.maintain.service.sendMessage;

@Service
@Transactional
public class SendMessageImpl implements sendMessage {

	@Autowired
	private SendMessageMapper sendMessageMapper;

	@Override
	public XSSFWorkbook show() {
		// 查出数据库数据（这里用Mybatis实现）
		List list = sendMessageMapper.findAll();// 查出数据库数据
		XSSFWorkbook wb = new XSSFWorkbook();
		Sheet sheet = wb.createSheet("Goods");// 创建一张表
		Row titleRow = sheet.createRow(0);// 创建第一行，起始为0
		titleRow.createCell(0).setCellValue("smid");// 第一列
		titleRow.createCell(1).setCellValue("company");
		titleRow.createCell(2).setCellValue("org");
		titleRow.createCell(3).setCellValue("dest");
		titleRow.createCell(4).setCellValue("senddata");
		int cell = 1;
		for (SendMessage goods : list) {
			Row row = sheet.createRow(cell);// 从第二行开始保存数据
			row.createCell(0).setCellValue(goods.getSmid());
			row.createCell(1).setCellValue(goods.getCompany());// 将数据库的数据遍历出来
			row.createCell(2).setCellValue(goods.getOrg());
			row.createCell(3).setCellValue(goods.getDest());
			row.createCell(4).setCellValue(goods.getSenddata());
			cell++;
		}
		return wb;
	}
}

数据库数据读取（Mybatis实现）
（1）接口（SendMessageMapper.java）

package com.southgis.imap.maintain.mapper;

import java.util.Date;
import java.util.List;

import com.southgis.imap.maintain.entity.SendMessage;

public interface SendMessageMapper {	
	//查询数据库所有字段
	List findAll();
}

（2）Mybatis（SendMessageMapper.xml）

	
		select * from SendMessage
	

对应实体类（SendMessage.java）

package com.southgis.imap.maintain.entity;


import java.util.Date;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

import org.hibernate.annotations.GenericGenerator;
import org.springframework.format.annotation.DateTimeFormat;

import com.fasterxml.jackson.annotation.JsonFormat;

import lombok.Data;
@Data
@Entity(name="sendmessage")
public class SendMessage {
	
	//主键
	@Id
	@GeneratedValue(generator="id")
	@GenericGenerator(name="id",strategy="native")
	private Integer id;
	
	private String smid;
	
	//所属公司
	private String company;
	
	private String org;
	//是否发送成功
	private String dest;
	
	private String senddata;
	
	//创建时间
	@DateTimeFormat(pattern="yyyy-MM-dd")
	@JsonFormat(timezone = "GMT+8", pattern = "yyyy-MM-dd")
	private Date insertDate;
	
	//是否发送成功?success or fail
	private Integer status;
	
	private String msgGroup;
	
	private String reportStatus;
	
	private String errorCode;
	
	@DateTimeFormat(pattern="yyyy-MM-dd")
	private Date receiveDate;
	
	@DateTimeFormat(pattern="yyyy-MM-dd")
	private Date sendDate;
}

主类（Application.java）

package com.southgis.imap.maintain;

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

@SpringBootApplication
@MapperScan("com.southgis.imap.maintain.mapper")
public class Application {
	public static void main(String[] args) {
		SpringApplication.run(Application.class, args);
		System.out.println("(♥◠‿◠)ﾉﾞ  SouthProject启动成功   ლ(´ڡ`ლ)ﾞ  \\n");
	}
}

相应pom依赖（pom.xml）

	4.0.0
	southtechnogy
	imap-southtechnogy2
	0.0.1-SNAPSHOT
	
		org.springframework.boot
		spring-boot-starter-parent
		2.0.0.RELEASE
	


	
		
			
				org.springframework.boot
				spring-boot-maven-plugin
				
					true
					true
				
			
			
				org.apache.maven.plugins
				maven-surefire-plugin
				
					true
					false
				
			

			
				org.apache.maven.plugins
				maven-compiler-plugin
				
					1.8
					1.8
				
			

			
			
				maven-resources-plugin
				
					
						copy-yml
						validate
						
							copy-resources
						
						
							${project.build.directory}
							
								
									src/main/resources
									application.yml
								
							
						
					
				
			
		
	


	
	
	 
            org.apache.poi
            poi
            3.15
        
        
            org.apache.poi
            poi-ooxml-schemas
            3.15
        
        
            org.apache.poi
            poi-ooxml
            3.15
        
	
	        com.alibaba
	        fastjson
	        1.2.7
	    
	     
	        net.sourceforge.jexcelapi
	        jxl
	        2.6.10
	    
		
			junit
			junit
			4.12
		
		
			org.springframework.boot
			spring-boot-starter-test
			test
			2.0.2.RELEASE
		
		
			org.springframework
			spring-beans
			5.0.5.RELEASE
			compile
		

		
			org.springframework.boot
			spring-boot-starter-web
		
		
			org.springframework.boot
			spring-boot-starter-thymeleaf
		
		
			org.springframework.boot
			spring-boot-starter-data-jpa
		

		
		

		
		
			org.springframework.boot
			spring-boot-starter-cache
		

		
			net.sf.ehcache
			ehcache
		

		
		
			org.springframework.boot
			spring-boot-starter-data-jpa
		
		
		
			com.alibaba
			druid
			1.0.9
		

		
		
			mysql
			mysql-connector-java
		

		
			org.mybatis.spring.boot
			mybatis-spring-boot-starter
			1.1.1
		

		
			org.springframework.boot
			spring-boot-starter-thymeleaf
		

		
			javax.servlet
			jstl
		

		
			org.apache.tomcat.embed
			tomcat-embed-jasper
			provided
		
		
		
		
			org.apache.commons
			commons-lang3
		

		
		
			org.projectlombok
			lombok
			provided
		

		
		
			com.alibaba
			fastjson
			1.2.32
		

		
		
			com.google.guava
			guava
		

		
		
			org.springframework.boot
			spring-boot-starter-aop
		

			 -->
		
		
			org.springframework.boot
			spring-boot-starter-web
			
				
					org.springframework.boot
					spring-boot-starter-tomcat
				
			
		

		
			org.apache.tomcat.embed
			tomcat-embed-jasper
			provided
		

		
		
			com.h2database
			h2
			test
		
		
		
		
	

	
	
		
			
				org.springframework.cloud
				spring-cloud-dependencies
				Finchley.M9 
				pom
				import
			
		
	

	
		
			spring-milestones
			Spring Milestones
			https://repo.spring.io/libs-milestone
			
				false
			
		
	
	
		
			releases
			infra realease
			http://172.16.50.180:8085/nexus/content/repositories/releases/
		
		
			snapshots
			infra snapshotRepository
			http://112.94.224.249:8085/nexus/content/repositories/snapshots/
		
	

相关配置文件（application.yml）

spring:
  datasource:
      driver-class-name: com.mysql.jdbc.Driver
      url: jdbc:mysql://localhost:3306/build?useUnicode=true&characterEncoding=UTF-8&useSSL=false
      username: root
      password: 112233
      initialize: true
  init-db: true
mybatis:
  type-aliases-package: com.southgis.imap.maintain.entity
  configuration:
    map-underscore-to-camel-case: true