springboot+easyExcel快速上手指南

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.0</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo1</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo1</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
      <!--引入easyExcel的依赖-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>2.2.10</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
​
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
​
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
​
</project>
​

package com.example.demo.dao;
​
/**
 * @Author:asher
 * @Date:2021/5/22 06:44
 * @Description:com.example.demo.dao
 * @Version:1.0
 */
public class User {
    private int id;
    private String name;
​
    public User(int id, String name) {
        this.id = id;
        this.name = name;
    }
​
    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                '}';
    }
​
    public int getId() {
        return id;
    }
​
    public void setId(int id) {
        this.id = id;
    }
​
    public String getName() {
        return name;
    }
​
    public void setName(String name) {
        this.name = name;
    }
}
​

package com.example.demo.util;
​
import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.write.metadata.WriteSheet;
import com.example.demo.dao.User;
​
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;
​
/**
 * @Author:asher
 * @Date:2021/5/22 06:53
 * @Description:com.example.demo.util
 * @Version:1.0
 */
public class ExcelUtil {
    public static void generateExcel(HttpServletResponse response, List<User> list) throws IOException {
//        创建ExcelWriter对象
        ExcelWriter excelWriter = EasyExcel.write(response.getOutputStream()).build();
//        创建工作簿
        WriteSheet writeSheet = EasyExcel.writerSheet(0, "sheet1").head(User.class).build();
//        向Excel中写入数据
        excelWriter.write(list, writeSheet);
//        关闭输出流
        excelWriter.finish();
    }
}

package com.example.demo.controller;
​
import com.example.demo.dao.User;
import com.example.demo.util.ExcelUtil;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
​
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
​
/**
 * @Author:asher
 * @Date:2021/5/22 06:46
 * @Description:com.example.demo.controller
 * @Version:1.0
 */
@Controller
public class UserController {
​
    @RequestMapping("/test")
    @ResponseBody
    public void test(HttpServletResponse response) throws IOException {
        List<User> userList = new ArrayList<>();
        userList.add(new User(1, "小红"));
        userList.add(new User(2, "花花"));
        response.setContentType("application/vnd.ms-excel");
        response.setHeader("Content-Disposition", "attachment; filename=" + "test.xlsx");
        ExcelUtil.generateExcel(response, userList);
    }
}

package com.example.demo;
​
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
​
@SpringBootApplication
public class Demo1Application {
​
    public static void main(String[] args) {
        SpringApplication.run(Demo1Application.class, args);
    }
}