CommonsMultipartFile---用Spring实现文件上传

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

　　org.springframework.web.multipart.commons.CommonsMultipartFile

方法汇总：

 

byte[]	getBytes()	Return the contents of the file as an array of bytes.
String	getContentType()	Return the content type of the file.
FileItem	getFileItem()	Return the underlying org.apache.commons.fileupload.FileItem instance
InputStream	getInputStream()	Return an InputStream to read the contents of the file from.
String	getName()	Return the name of the parameter in the multipart form.
String	getOriginalFilename()	Return the original filename in the client's filesystem.
long	getSize()	Return the size of the file in bytes.
String	getStorageDescription()	Return a description for the storage location of the multipart content.
protected  boolean	isAvailable()	Determine whether the multipart content is still available.
boolean	isEmpty()	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.
voic	transferTo(File dest)	Transfer the received file to the given destination file.

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();

}