CommonsMultipartFile---用Spring实现文件上传

时间：2016-02-16 18:22:08 阅读：315 评论：0 收藏：0 [点我收藏+]

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

　　技术分享 org.springframework.web.multipart.commons.CommonsMultipartFile

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();
}

原文：http://www.cnblogs.com/lin-bear/p/5193096.html

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