java 使用easypoi导出excel表格 自动弹出下载

1.Service接口

public interface ExcelExportService {

    ResponseEntity<byte[]> exportExcel() throws IOException;

}

2.Service接口实现类

package com.test.service.test.impl;

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;


/**
 * 导出
 * @author xxx
 */
@Slf4j
@Validated
@Service(value = ExcelExportServiceImpl.SERVICE_QUALIFIER)
public class ExcelExportServiceImpl
        extends AbstractExampleService<Mapper, Model, ModelExample>
        implements ExcelExportService
{

    public static final String SERVICE_QUALIFIER = "com.test.service.test.impl.ExcelExportServiceImpl";

    @Override
    public ResponseEntity<byte[]> exportExcel() throws IOException{
        
        //获取导出数据
        List<ExportVO> list = getExportList();
        String fileName = "列表-" + System.currentTimeMillis() + ".xlsx";

　　　　 //xlsx格式Excel表格，那么在创建类型为07版的XSSF，并且设置ContentType为07版的格式
        ExportParams exportParams = new ExportParams(null, null, ExcelType.XSSF);
　　　　 //生成workbook
　　　　 Workbook workbook = ExcelExportUtil.exportExcel(exportParams, ExportVO.class, list); HttpHeaders httpHeaders = new HttpHeaders();
        //03版 ContentType
        //httpHeaders.add("content-Type", "application/vnd.ms-excel");
　　　　 //07版 ContentType
　　　　 httpHeaders.add("content-Type", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
        httpHeaders.add("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
        ByteArrayOutputStream output = null;
        InputStream inputStream = null;

        try {
            //获得它的输入流
            output = new ByteArrayOutputStream();
            workbook.write(output);
            inputStream = new ByteArrayInputStream(output.toByteArray());
            output.flush();

            //使用输入流创建指定大小的byte[]数组，并将字节码存入byte[]数组中
            byte[] body = new byte[inputStream.available()];
            inputStream.read(body);
            inputStream.close();

            return new ResponseEntity<>(body, httpHeaders, HttpStatus.OK);

        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

}

ExportVO模型

package com.test.vo;

import cn.afterturn.easypoi.excel.annotation.Excel;

/**
 * @author xxx
 */
public class ExportVO {

    /**
     * name指定导出excel时生成的列名
     * orderNum可指定导出的该属性对应的所在列的位置
     * width设置单元格宽度
     * type设置导出类型  1是文本, 2是图片, 3是函数,10 数字 默认是文本
     */

    /**
     * 姓名
     */
    @Excel(name = "姓名", orderNum = "1", width = 20)
    private String name;
    
    /**
     * 当gender为1时，导出的结果为 男， 当gender为0时，导出的结果为 女
     * mergeVertical设置是否纵向合并列
     */
    @Excel(name = "性别",mergeVertical = true, replace = {"男_1", "女_0"},orderNum = "2", width = 5)
    private Integer gender;


    /**
     * type设置导出类型  1是文本, 2是图片, 3是函数,10 数字 默认是文本
     */
    @Excel(name = "年龄",orderNum = "3", type = 10, width = 5)
    private int age;


    /**
     * 无参构造
     */
    public ExportVO() {
    }

    /**
     * 全参构造
     */
    public ExportVO(String name, Integer gender, int age){
        this.name = name;
        this.gender = gender;
        this.age = age;
    }

    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public Integer getGender() {
        return gender;
    }
 
    public void setGender(Integer gender) {
        this.gender = gender;
    }
 
    public int getAge() {
        return age;
    }
 
    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "ExportVO{name='" + name +
                "', gender='" + gender +
                "', age='" + age +
                "', area='" + area +"'}";
    }

}