EasyExcel 导入导出

---

一、引入pom

1.引入库

代码如下（示例）：

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>3.0.5</version>
        </dependency>

提示：easyexcel会自带依赖于4.12的poi，所以如果项目其它地方引入了其它版本的poi，就会导致easyExcel导出失败等一系列问题，主要原因是因为poi版本冲突导致的。

   <!--EasyExcel 排除easyExcel中自带的poi依赖-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>3.0.5</version>
            <!-- 排除easyExcel中自带的poi依赖-->
            <exclusions>
                <exclusion>
                    <groupId>javax.servlet</groupId>
                    <artifactId>servlet-api</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.apache.poi</groupId>
                    <artifactId>poi</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.apache.poi</groupId>
                    <artifactId>poi-ooxml</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>org.apache.poi</groupId>
                    <artifactId>poi-ooxml-schemas</artifactId>
                </exclusion>
            </exclusions>
         </dependency>

2.导入导出代码

代码如下（示例）：

 @ApiOperation("EasyExcel导入")
    @PostMapping("import")
    public R importJobs(@RequestParam MultipartFile file, HttpServletRequest request) throws IOException {
        InputStream inputStream = file.getInputStream();

        long start = System.currentTimeMillis();
        EasyExcel.read(inputStream, User.class, new PageReadListener<User>(dataList -> {
            for (User user : dataList) {
                System.out.println(user);
            }
        })).headRowNumber(1).sheet().doRead();
        System.out.println("总耗时:" + (System.currentTimeMillis() - start) / 1000 + " s");


        return R.ok();
    }

    @ApiOperation("EasyExcel导出")
    @PostMapping("export")
    public void export(HttpServletResponse response) {

        String fileName = "用户报名管理.xlsx";
        try {

            List<User> userList = new ArrayList<>();
            User user = new User();
            user.setUserName("lisi");
            user.setId("1");
            user.setAddress("xxx");
            userList.add(user);

            setResponseHeader(response, fileName);
            EasyExcel.write(response.getOutputStream(), User.class).sheet("用户表").doWrite(userList);
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

    public static void setResponseHeader(HttpServletResponse response, String realFileName) {
        String percentEncodedFileName = URLEncodeUtil.encode(realFileName);
        StringBuilder contentDispositionValue = new StringBuilder();
        contentDispositionValue.append("attachment; filename=")
                .append(percentEncodedFileName)
                .append(";")
                .append("filename*=")
                .append("utf-8''")
                .append(percentEncodedFileName);
        response.addHeader("Access-Control-Allow-Origin", "*");
        response.addHeader("Access-Control-Expose-Headers", "Content-Disposition,download-filename");
        response.setHeader("Content-disposition", contentDispositionValue.toString());
        response.setHeader("download-filename", percentEncodedFileName);
    }

实体类（示例）：

ExcelProperty注解标注excel里的字段名称。

@Data
@ToString
public class User {

    @ExcelProperty("id")
    private String id;

    @ExcelProperty("用户名")
    private String userName;

    @ExcelProperty("地址")
    private String address;

}

---

End