①.首先导入相应的jar包，然后我们建立一个index.jsp页面。
<%@ page language="java" contentType="text/html; charset=GB18030"
pageEncoding="GB18030"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GB18030">
<title>Insert title here</title>
</head>
<body>
<form action="upload.action" method="post" enctype="multipart/form-data">
标题：<input type="text" name="title"><br>
文件:<input type="file" name="myFile"><br>
<input type="submit" value="上传">
</form>
</body>
</html>②然后我们需要一个Action来处理上传，代码如下：
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import com.opensymphony.xwork2.Action;
public class UploadTestAction {
private String title;
//可以得到上传文件的名称
//规则：输入域的名称+固定字符串FileName
private String myFileFileName;
//取得文件数据
//规则：File 输入域的名称
private File myFile;
// //取得内容类型
// //规则：输入域的名称+固定字符串ContentType
private String myFileContentType;
public String getMyFileFileName() {
return myFileFileName;
}
public void setMyFileFileName(String myFileFileName) {
this.myFileFileName = myFileFileName;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public File getMyFile() {
return myFile;
}
public void setMyFile(File myFile) {
this.myFile = myFile;
}
public String getMyFileContentType() {
return myFileContentType;
}
public void setMyFileContentType(String myFileContentType) {
this.myFileContentType = myFileContentType;
}
public String execute() throws Exception {
InputStream is = null;
OutputStream os = null;
try {
is = new BufferedInputStream(
new FileInputStream(myFile));
os = new BufferedOutputStream(
new FileOutputStream("D:\\" + myFileFileName));
byte[] buffer = new byte[1024];
int len = 0;
while ((len = is.read(buffer)) > 0) {
os.write(buffer, 0, len);
}
}finally {
if (is != null) {is.close();}
if (os != null) {os.close();}
}
return Action.SUCCESS;
}
}③Action写完以后再到struts2的配置文件配置一下代码如下：
<?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>
<!-- 当struts.xml配置文件发生修改，会立刻加载，在生产环境下最好不要配置 -->
<constant name="struts.configuration.xml.reload" value="true"/>
<!-- 会提供更加友好的提示信息 -->
<constant name="struts.devMode" value="true"/>
<!-- 需要继承struts-default包，这样就拥有的最基本的功能 -->
<package name="upload-package" extends="struts-default">
<action name="upload" class="com.csu.struts2.UploadTestAction">
<result>/success.jsp</result>
</action>
</package>
</struts>
原文地址：http://blog.csdn.net/dq3wrr/article/details/38679661
