java程序基于POI导出数据并存入excel中详细教程（基于SSM框架）

0)poi简单介绍
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。
HSSF － 提供读写Microsoft Excel格式档案的功能。
XSSF － 提供读写Microsoft Excel OOXML格式档案的功能。
HWPF － 提供读写Microsoft Word格式档案的功能。
HSLF － 提供读写Microsoft PowerPoint格式档案的功能。
HDGF － 提供读写Microsoft Visio格式档案的功能。
1）导入依赖

<dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>4.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>4.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml-schemas</artifactId>
            <version>4.0.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.5.6</version>
        </dependency>

2）实体类

package com.example.bean;

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

import java.io.Serializable;

/**
 * @ClassName ExcelBean
 * @Description TODO
 * @Author 胡泽
 * @Date 2019/8/31 9:33
 * @Version 1.0
 */
public class ExcelBean implements Serializable {
    private String headTextName; // 列头（标题）名
    private String propertyName; // 对应字段名
    private Integer cols; // 合并单元格数
    private XSSFCellStyle cellStyle;

    public ExcelBean() {
    }

    public ExcelBean(String headTextName, String propertyName) {
        this.headTextName = headTextName;
        this.propertyName = propertyName;
    }

    public ExcelBean(String headTextName, String propertyName, Integer cols) {
        super();
        this.headTextName = headTextName;
        this.propertyName = propertyName;
        this.cols = cols;
    }

    public String getHeadTextName() {
        return headTextName;
    }

    public void setHeadTextName(String headTextName) {
        this.headTextName = headTextName;
    }

    public String getPropertyName() {
        return propertyName;
    }

    public void setPropertyName(String propertyName) {
        this.propertyName = propertyName;
    }

    public Integer getCols() {
        return cols;
    }

    public void setCols(Integer cols) {
        this.cols = cols;
    }

    public XSSFCellStyle getCellStyle() {
        return cellStyle;
    }

    public void setCellStyle(XSSFCellStyle cellStyle) {
        this.cellStyle = cellStyle;
    }

}

3）controller类

@RequestMapping(value = "export", method = RequestMethod.POST)
    @ResponseBody
    public void exportUser(HttpServletRequest request, HttpServletResponse response) throws IOException, Exception {
        response.reset(); // 清除buffer缓存
        // 指定下载的文件名，浏览器都会使用本地编码，即GBK，浏览器收到这个文件名后，用ISO-8859-1来解码，然后用GBK来显示
        // 所以我们用GBK解码，ISO-8859-1来编码，在浏览器那边会反过来执行。

       String name=  new String("用户一览.xlsx".getBytes("GBK"));
        response.setHeader("Content-Disposition",
                "attachment;filename="+name);

        response.setContentType("application/vnd.ms-excel;charset=UTF-8");
        response.setHeader("Pragma", "no-cache");
        response.setHeader("Cache-Control", "no-cache");
        response.setDateHeader("Expires", 0);
        UserInfoExample example = new UserInfoExample();
        List<UserInfo> userList = userInfoService.selectByExample(example);
        // 导出Excel对象
        OutputStream output;
        List<ExcelBean> excel = new ArrayList<>();
        Map<Integer, List<ExcelBean>> map = new LinkedHashMap<>();
        //设置标题栏
        excel.add(new ExcelBean("编号", "id", 0));
        excel.add(new ExcelBean("姓名", "loginname", 0));
        excel.add(new ExcelBean("密码", "password", 0));
        excel.add(new ExcelBean("状态", "status", 0));
        excel.add(new ExcelBean("加入时间", "createdate", 0));
        excel.add(new ExcelBean("登录名", "username", 0));
        map.put(0, excel);
        String sheetName = "用户一览";
        //调用ExcelUtil的方法
        XSSFWorkbook workbook = ExcelUtil.createExcelFile(UserInfo.class, userList, map, sheetName);
        try {
            output = response.getOutputStream();
            BufferedOutputStream bufferedOutPut = new BufferedOutputStream(output);
            bufferedOutPut.flush();
            workbook.write(bufferedOutPut);
            bufferedOutPut.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

4）效果图

导出成功哈哈，大家有不懂的可以私聊我哈！！！！