CommonsMultipartFile---用Spring实现文件上传

我不是女神ヾ 2022-05-23 11:53 224阅读 0赞

CommonsMultipartFile

Spring提供的读取文件的类，使用方便，依赖spring-web-3.1.2.RELEASE.jar

包路径：

java.lang.Object

![extended by][]org.springframework.web.multipart.commons.CommonsMultipartFile

方法汇总：

<table style="margin:0px;padding:0px;border:1px solid #C0C0C0;"> 
 <tbody style="margin:0px;padding:0px;"> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">byte[]</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;"><code style="margin:0px;padding:0px;"><span style="margin:0px;padding:0px;">getBytes</span>()</code>&nbsp;</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">Return the contents of the file as an array of bytes.</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;"><code style="margin:0px;padding:0px;">String</code></td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;"><code style="margin:0px;padding:0px;"><span style="margin:0px;padding:0px;">getContentType</span>()</code></td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">&nbsp;Return the content type of the file.</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">FileItem</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;"><code style="margin:0px;padding:0px;"><span style="margin:0px;padding:0px;">getFileItem</span>()</code></td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">Return the underlying&nbsp;<code style="margin:0px;padding:0px;">org.apache.commons.fileupload.FileItem</code>&nbsp;instance</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">InputStream</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;"><code style="margin:0px;padding:0px;"><span style="margin:0px;padding:0px;">getInputStream</span>()</code></td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">Return an InputStream to read the contents of the file from.</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">String</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;"><code style="margin:0px;padding:0px;"><span style="margin:0px;padding:0px;">getName</span>()</code></td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">Return the name of the parameter in the multipart form.</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">String</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;"><code style="margin:0px;padding:0px;"><span style="margin:0px;padding:0px;">getOriginalFilename</span>()</code></td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">&nbsp;&nbsp;Return the original filename in the client's filesystem.</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">long</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;"><code style="margin:0px;padding:0px;"><span style="margin:0px;padding:0px;">getSize</span>()</code></td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">Return the size of the file in bytes.</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">String</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;"><code style="margin:0px;padding:0px;"><span style="margin:0px;padding:0px;">getStorageDescription</span>()</code></td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">&nbsp;Return a description for the storage location of the multipart content.</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;"><code style="margin:0px;padding:0px;">protected &nbsp;boolean</code></td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;"><code style="margin:0px;padding:0px;"><span style="margin:0px;padding:0px;">isAvailable</span>()</code></td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">Determine whether the multipart content is still available.</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">boolean</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;"><code style="margin:0px;padding:0px;"><span style="margin:0px;padding:0px;">isEmpty</span>()</code>&nbsp;&nbsp;</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">Return whether the uploaded file is empty, that is, either no file has been chosen in the multipart form or the chosen file has no content.</td> 
  </tr> 
  <tr style="margin:0px;padding:0px;"> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">voic</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;"><code style="margin:0px;padding:0px;"><span style="margin:0px;padding:0px;">transferTo</span>(File&nbsp;dest)</code>&nbsp;&nbsp;</td> 
   <td style="margin:0px;padding:3px;border-color:#C0C0C0;border-collapse:collapse;">&nbsp;Transfer the received file to the given destination file.</td> 
  </tr> 
 </tbody> 
</table>

使用方法：

1.spring配置文件配置文件上传解析器     <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">         <property name="defaultEncoding" value="utf-8"></property>         <property name="maxUploadSize" value="90000000" />         <property name="uploadTempDir" value="uploadFiles"></property>     </bean> 2.html写法注意两点     a.input类型为file：<input  type="file" name="sealPfxFile"  id="sealPfxFile" size="24" />     b.form中增加参数 enctype="multipart/form-data"：        <form id="addSeal" name="addSeal" action="$\{root\}/seal/o\_add.do" enctype="multipart/form-data" method="post">   3.Service的写法 （注意与html中定义的名称相同即可通过get方法取得需要的内容） public String doAction( @RequestParam("sealPfxFile") CommonsMultipartFile sealPfxFile, Seal seal, ModelMap modelMap, HttpServletRequest request) throws Exception \{        //上传文件名       String fileName = sealPfxFile.getFileItem().getName(); 　　//上传文件流       InputStream is = sealPfxFile.getInputStream(); \}

[extended by]: /images/20220523/93d0dcdae3134517b4a14947f747bd87.png