Easyexcel exports excel tables to the browser, and exports excel through postman test [introductory case]

One 、 Preface

Xiaobian recently received an export Excel The needs of , The demand is still very simple , Just export the information displayed in the table to Excel That's all right. , There are no complicated merge columns .

Common exports Excel Technology ：

• hutool
• easyExcel
• poi

hutool and easyExcel All right. poi Encapsulation , More convenient to use ！ Because companies use EasyExcel Export , Xiaobian can't be independent . If you want to see poi and hutool Export can see the article written before Xiaobian ：
Use POI+hutool Import Excel
Use POI Export the queried data table data to Excel in , One watch, one sheet
Don't talk much , Let's go straight to .

Two 、 Import Maven rely on

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

Particular attention ：
The version here should be a little higher , Otherwise, we have the date when exporting jdk8 New characteristics LocalDateTime, Will not support ！
It is used by colleagues before Xiaobian started to use it 2. A few The version does not support the problem , Everybody be careful ！！

3、 ... and 、 Write exported entity classes

@Data
@ColumnWidth(20)
public class Test implements Serializable {
    
    private static final long serialVersionUID = 337361630075002456L;

    @TableId(type= IdType.ASSIGN_ID)
    @ExcelProperty(value = "id",index = 0)
    private long id;

    @ExcelProperty(value = " name ",index = 1)
    private String name;
    
    @ExcelProperty(value = " Gender ",index = 2)
    private String gender;

    @ExcelProperty(value = " data ",index = 3)
    private String data;

    @ExcelProperty(value = " Creation time ",index = 4)
    private LocalDateTime createDate;
	
	@ExcelProperty(value = " Update time ",index = 5)
    private LocalDateTime updateDate;

}

Parameter interpretation ：
@ExcelProperty： Add to the fields to be exported ,value Export the contents displayed in the header , If not, the field name will be used as the header .
After the small editor test ： Exported entity class , It will be exported without this annotation , But the header is the field name ！！

@ColumnWidth(20): Set the length of each header , The loading class is all of this length , The length of a header is added to the field ！

If you need to merge , You need to specify your own policy , Inherit extends AbstractCellWriteHandler rewrite afterCellDispose, That's all right. ; I won't show you here , I will give you a detailed teaching when I have this demand later ！！

Four 、 test

For convenience, Xiaobian directly in controller It's done in , Don't learn , The business is in service It's quite standard ！

@RestController
@RequestMapping("/test")
@Slf4j
@RequiredArgsConstructor
public class TestController {
    

    private final TestService testService;

    @NonNull
    private TestMapper testMapper;

    @SneakyThrows
    @GetMapping("/easyExcel")
    public void easyExcel (HttpServletResponse response){
    
        String fileName = new String(" export excel.xlsx".getBytes(), StandardCharsets.ISO_8859_1);
        response.setContentType("application/vnd.ms-excel");
        response.setCharacterEncoding("utf8");
        response.setHeader("Content-disposition", "attachment;filename=" + fileName );
        List<Test> list = testMapper.selectList(null);
        ServletOutputStream outputStream = response.getOutputStream();
        EasyExcel.write(outputStream, Test.class)
                .sheet("sheet1")
                .doWrite(list);
    }
}

If the @RequiredArgsConstructor If you don't understand, you can take a look at this article ！@RequiredArgsConstructor Instead of @Autowrired

5、 ... and 、 Browser Test

We now visit in the browser , Address ：http://localhost:8089/test/easyExcel

6、 ... and 、Postman test

remind ： Usually, when we develop at the enterprise level , All require login verification , At this time, we cannot access the test through the browser , We need to use Postman To test , At the beginning, what I compiled and exported were all random codes , Later, my friend told me , Export cannot be done directly Send, To click... Below Send And Download. Now let me show you ：

7、 ... and 、 View the export file

We can see that there is no random code ！

8、 ... and 、 summary

So we finished the test , Successfully exported Excel. This article is just a simple export test , Maybe your needs should be beautified , Please refer to the official website for details ：easyExcel Official website

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