超简洁！利用easyExcel导出，读入Excel

 

 

 

x

 

 

 

 

    深夜，在东莞，7天酒店，打开电脑，访问国内最大的同性交友网站。

 

 

日常开发中，导出导入场景非常多，尤其是对于后台管理更是一个列表一个导出，如果从导出的业务中抽离出复用代码，专注于逻辑开发，对于开发者而言非常重要。前有使用POI，但作者还是更喜EasyExcel的简洁高效不拖沓，所以特意写篇文章记录下。

准备工作

准备工作是看文档了解EasyExcel吗？不，我们直接上手吧！我发现最近的业务里面，最简单的例子已经应付下来了！所以准备工作自然只需导入EasyExcel的jar包，这里我们由于是springboot项目，所以直接使用maven。直接上最新的版本了！pom.xml给它加上：

 

 

 

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<dependency>

            <groupId>com.alibaba</groupId>

            <artifactId>easyexcel</artifactId>

            <version>2.2.5</version>

</dependency>

 

 

导出

准备工作已经完成，导出开始，首先需要一个Bean类，导出的字段和Excel文件的字段一样即可。@Data是用了lombok，@ExcelProperty则包含了Excel首行的名称和字段所在位置，从0开始，不能重复。

 

 

 

​x

 

 

 

 

@Data

public class ExportVo {

  @ExcelProperty(value = "名称", index = 0)

  private String name;

​

  @ExcelProperty(value = "时间", index = 1)

  private Date time;

  @NumberFormat("#.##%")

  @ExcelProperty(value = "完成率", index = 2)

  private Float rate;

}

 

 

接下来是逻辑实现：

 

 

 

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  @PostMapping("/export")

  public void export(@RequestBody ExportDto dto, HttpServletResponse response)

          throws IOException {

    String fileName = "统计表";

    ExcelUtil.download(response, fileName, ExportVo.class,

            getExportVoList());

  }

​

  private List getExportVoList() {

    //  这里主要是获取List<ExportVo>内容，不提供实现了，需要说下注意点。

      1、导出列表应该有时间之类的限制（例如最近一个月），避免导出Excel过大，过大Excel一般采用分sheet导出（尤其xls文件，有65535条数限制）、分文件打包导出，上传文件服务器异步导出，不可突破的最大导出（限死5w条）。

      2、一来考虑数据库查询和内存压力，二来分页插件可能存在最大页数限制，所以较多条数时必须做分页查询，再组合List对象。

      3、一般从数据库直接查出数据不满足导出字段需要，有必要时需要做字段转换。

  }

 

 

导出的处理类：

 

 

 

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public class ExcelUtil {

​

  public static void download(HttpServletResponse response, String fileName,

                              Class cls, List dataList)

          throws IOException {

    response.setContentType("application/vnd.ms-excel");

    response.setCharacterEncoding("utf-8");

    String fname = URLEncoder.encode(fileName, "utf-8");

    response.setHeader("Content-disposition",

            "attachment;filename=" + fname + ExcelTypeEnum.XLSX.getValue());

​

    LongestMatchColumnWidthStyleStrategy longestMatchColumnWidthStyleStrategy =

            new LongestMatchColumnWidthStyleStrategy();

    EasyExcel.write(response.getOutputStream(), cls)

            .sheet("sheet1")

            .registerWriteHandler(longestMatchColumnWidthStyleStrategy)

​

            .doWrite(dataList);

    response.flushBuffer();

  }

 

 

启动程序，使用postman试下，直接点Send的话会返回一堆乱码，选择Send and Download则可导出Excel，不过文件名是URL编码过的，这个文件名编码问题在浏览器则不会存在。

导入

导入是为了减少人工录入大量数据的烦恼，挺好的。

 

 

 

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  @Autowired

  private ImportService importService;

​

  @PostMapping("/import")

  public void import(

          @RequestParam(value = "file") MultipartFile file,

          @Min(1) @RequestParam("type") int type

  ) throws IOException {

    ImportQueryDto dto = new ImportQueryDto();

    dto.setType(type);

    // ImportDto是导入对应类，UploadDataListener是处理类，逻辑处理服务需要以参数形式传入

    EasyExcel.read(file.getInputStream(), ImportDto.class,

            new UploadDataListener(importService)).sheet().doRead();

  }

​

 

 

导入Excel对应类，ExcelProperty对应导入字段的首部。

 

 

 

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@Data

public class ImportDto {

  @ExcelProperty("名称")

  private String name;

  @ExcelProperty("数量")

  private Integer num;

}

 

 

导入处理：

 

 

 

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public class UploadDataListener

        extends AnalysisEventListener<ImportDto> {

  //  一次导入多少便入库，避免大量入库

  private static final int BATCH_COUNT = 50;

  //  存放导入列表

  List<ImportDto> list = new ArrayList<>();

​

  private ImportService importService;

​

  public UploadDataListener(ImportService importService) {

    this.importService = importService;

  }

​

  @Override

  public void invoke(ImportDto importDto, AnalysisContext analysisContext) {

    list.add(importDto);

    if (list.size() >= BATCH_COUNT) {

      saveData();

      list.clear();

    }

  }

​

  @Override

  public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    saveData();

  }

​

  private void saveData() {

    List<ImportModel> importModelList = new ArrayList<>();

    for (ImportDto dto : list) {

      ImportModel model = new ImportModel();

      model.setName(dto.getName());

      model.setNum(dto.getNum())

      importModelList.add(model);

    }

    importService.saveBatch(importModelList);

  }

​

}

​

 

 

实际上，导入文件的内容是需要校验的，数据格式校验等，需要询问产品是否忽略错误的数据，只导入正常的数据，然后怎么友好提示错误的内容，通过返回一个包含错误信息Excel或提示框，更进一步的提示，则是提示到哪一个格子有问题。

睡觉。

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h3:hover a.anchor,
h4:hover a.anchor,
h5:hover a.anchor,
h6:hover a.anchor {
text-decoration: none;
}
h1 tt,
h1 code {
font-size: inherit;
}
h2 tt,
h2 code {
font-size: inherit;
}
h3 tt,
h3 code {
font-size: inherit;
}
h4 tt,
h4 code {
font-size: inherit;
}
h5 tt,
h5 code {
font-size: inherit;
}
h6 tt,
h6 code {
font-size: inherit;
}
h1 {
padding-bottom: .3em;
font-size: 2.25em;
line-height: 1.2;
border-bottom: 1px solid #eee;
}
h2 {
padding-bottom: .3em;
font-size: 1.75em;
line-height: 1.225;
border-bottom: 1px solid #eee;
}
h3 {
font-size: 1.5em;
line-height: 1.43;
}
h4 {
font-size: 1.25em;
}
h5 {
font-size: 1em;
}
h6 {
font-size: 1em;
color: #777;
}
p,
blockquote,
ul,
ol,
dl,
table{
margin: 0.8em 0;
}
li>ol,
li>ul {
margin: 0 0;
}
hr {
height: 2px;
padding: 0;
margin: 16px 0;
background-color: #e7e7e7;
border: 0 none;
overflow: hidden;
box-sizing: content-box;
}

li p.first {
display: inline-block;
}
ul,
ol {
padding-left: 30px;
}
ul:first-child,
ol:first-child {
margin-top: 0;
}
ul:last-child,
ol:last-child {
margin-bottom: 0;
}
blockquote {
border-left: 4px solid #dfe2e5;
padding: 0 15px;
color: #777777;
}
blockquote blockquote {
padding-right: 0;
}
table {
padding: 0;
word-break: initial;
}
table tr {
border-top: 1px solid #dfe2e5;
margin: 0;
padding: 0;
}
table tr:nth-child(2n),
thead {
background-color: #f8f8f8;
}
table tr th {
font-weight: bold;
border: 1px solid #dfe2e5;
border-bottom: 0;
margin: 0;
padding: 6px 13px;
}
table tr td {
border: 1px solid #dfe2e5;
margin: 0;
padding: 6px 13px;
}
table tr th:first-child,
table tr td:first-child {
margin-top: 0;
}
table tr th:last-child,
table tr td:last-child {
margin-bottom: 0;
}

.CodeMirror-lines {
padding-left: 4px;
}

.code-tooltip {
box-shadow: 0 1px 1px 0 rgba(0,28,36,.3);
border-top: 1px solid #eef2f2;
}

.md-fences,
code,
tt {
border: 1px solid #e7eaed;
background-color: #f8f8f8;
border-radius: 3px;
padding: 0;
padding: 2px 4px 0px 4px;
font-size: 0.9em;
}

code {
background-color: #f3f4f4;
padding: 0 2px 0 2px;
}

.md-fences {
margin-bottom: 15px;
margin-top: 15px;
padding-top: 8px;
padding-bottom: 6px;
}

.md-task-list-item > input {
margin-left: -1.3em;
}

@media print {
html {
font-size: 13px;
}
table,
pre {
page-break-inside: avoid;
}
pre {
word-wrap: break-word;
}
}

.md-fences {
background-color: #f8f8f8;
}
#write pre.md-meta-block {
padding: 1rem;
font-size: 85%;
line-height: 1.45;
background-color: #f7f7f7;
border: 0;
border-radius: 3px;
color: #777777;
margin-top: 0 !important;
}

.mathjax-block>.code-tooltip {
bottom: .375rem;
}

.md-mathjax-midline {
background: #fafafa;
}

#write>h3.md-focus:before{
left: -1.5625rem;
top: .375rem;
}
#write>h4.md-focus:before{
left: -1.5625rem;
top: .285714286rem;
}
#write>h5.md-focus:before{
left: -1.5625rem;
top: .285714286rem;
}
#write>h6.md-focus:before{
left: -1.5625rem;
top: .285714286rem;
}
.md-image>.md-meta {
/*border: 1px solid #ddd;*/
border-radius: 3px;
padding: 2px 0px 0px 4px;
font-size: 0.9em;
color: inherit;
}

.md-tag {
color: #a7a7a7;
opacity: 1;
}

.md-toc {
margin-top:20px;
padding-bottom:20px;
}

.sidebar-tabs {
border-bottom: none;
}

#typora-quick-open {
border: 1px solid #ddd;
background-color: #f8f8f8;
}

#typora-quick-open-item {
background-color: #FAFAFA;
border-color: #FEFEFE #e5e5e5 #e5e5e5 #eee;
border-style: solid;
border-width: 1px;
}

/** focus mode */
.on-focus-mode blockquote {
border-left-color: rgba(85, 85, 85, 0.12);
}

header, .context-menu, .megamenu-content, footer{
font-family: "Segoe UI", "Arial", sans-serif;
}

.file-node-content:hover .file-node-icon,
.file-node-content:hover .file-node-open-state{
visibility: visible;
}

.mac-seamless-mode #typora-sidebar {
background-color: #fafafa;
background-color: var(--side-bar-bg-color);
}

.md-lang {
color: #b4654d;
}

.html-for-mac .context-menu {
--item-hover-bg-color: #E6F0FE;
}

#md-notification .btn {
border: 0;
}

.dropdown-menu .divider {
border-color: #e5e5e5;
}

.ty-preferences .window-content {
background-color: #fafafa;
}

.ty-preferences .nav-group-item.active {
color: white;
background: #999;
}
-->