struts2文件上传实例：
1.upload.jsp
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>文件上传</title>
</head>
<body>
<s:form action="upload" method="post" enctype="multipart/form-data">
<s:file name="file"></s:file>
<s:submit value="submit"></s:submit>
</s:form>
</body>
</html>
2.uploadSuccess.jsp
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>文件下载成功页面</title>
</head>
<body>
file upload Success!
</body>
</html>
3.UploadAction.java
package com.hitsoft.action;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import com.opensymphony.xwork2.ActionSupport;
public class UploadAction extends ActionSupport {
private File file;//对应真正上传的文件
private String fileFileName;//对应上传的文件名
public File getFile() {
return file;
}
public void setFile(File file) {
this.file = file;
}
public String getFileFileName() {
return fileFileName;
}
public void setFileFileName(String fileFileName) {
this.fileFileName = fileFileName;
}
public String execute() throws Exception{
InputStream is = new FileInputStream(file);
OutputStream os = new FileOutputStream("c:\\" +fileFileName);
byte[] buffer = new byte[1024];
int length = 0;
while((length=is.read(buffer))!=-1){
os.write(buffer, 0, length);
}
os.close();
is.close();
return SUCCESS;
}
}
4.struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="struts2" extends="struts-default">
<!-- 文件上传：需要commons-io.2.0.1.jar-->
<action name="upload" class="com.hitsoft.action.UploadAction">
<result name="success">/uploadSuccess.jsp</result>
</action>
</package>
</struts>
5.lib目录中的jar包:
commons-fileupload-1.2.1.jar
commons-logging.jar
freemarker-2.3.15.jar
ognl-2.7.3.jar
struts2-core-2.1.8.1.jar
xwork-core-2.1.6.jar
commons-io.2.0.1.jar
6.访问地址：
http://localhost:8080/struts2/upload.jsp
选择本机文件，点击上传，然后去本机C盘下查看文件是否下载成功。
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