用Struts2实现单文件上传我们先来看下如何配置吧！
先配置一下web.xml
[html]
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="www.w3.org/2001/XMLSchema-instance"
xmlns="java.sun.com/xml/ns/javaee" xmlns:web="java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="java.sun.com/xml/ns/javaee java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
<init-param>
<param-name>config</param-name>
<param-value>struts-default.xml,struts-plugin.xml,/struts.xml</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="www.w3.org/2001/XMLSchema-instance"
xmlns="java.sun.com/xml/ns/javaee" xmlns:web="java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="java.sun.com/xml/ns/javaee java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
<init-param>
<param-name>config</param-name>
<param-value>struts-default.xml,struts-plugin.xml,/struts.xml</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
新建一个上传页面：upload.jsp
[html
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title></title>
</head>
<body>
<form action="upload.action" method="post" enctype="multipart/form-data">
file:<input type="file" name="file" /><br>
<input type="submit" value="submit"/>
</form>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title></title>
</head>
<body>
<form action="upload.action" method="post" enctype="multipart/form-data">
file:<input type="file" name="file" /><br>
<input type="submit" value="submit"/>
</form>
</body>
</html>
UploadAction.java:
[java]
package com.struts2.action;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class UploadAction extends ActionSupport {
private static final long serialVersionUID = 1L;
/** 文件 */
private File file;
/** 文件名 */
private String fileFileName;
/** 文件类型 */
private String fileContentType;
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 getFileContentType（） {
return fileContentType;
}
public void setFileContentType（String fileContentType） {
this.fileContentType = fileContentType;
}
@Override
public String execute（） throws Exception {
String uploadPath = ServletActionContext.getServletContext（）
.getRealPath（"/upload"）；
InputStream is = new FileInputStream（file）；
OutputStream os = new FileOutputStream（new File（uploadPath,
this.fileFileName））；
int length = 0;
byte[] buffer = new byte[1024];
while （-1 != （length = is.read（buffer））） {
os.write（buffer, 0, length）；
}
is.close（）；
os.close（）；
return SUCCESS;
}
}
package com.struts2.action;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class UploadAction extends ActionSupport {
private static final long serialVersionUID = 1L;
/** 文件 */
private File file;
/** 文件名 */
private String fileFileName;
/** 文件类型 */
private String fileContentType;
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 getFileContentType（） {
return fileContentType;
}
public void setFileContentType（String fileContentType） {
this.fileContentType = fileContentType;
}
@Override
public String execute（） throws Exception {
String uploadPath = ServletActionContext.getServletContext（）
.getRealPath（"/upload"）；
InputStream is = new FileInputStream（file）；
OutputStream os = new FileOutputStream（new File（uploadPath,
this.fileFileName））；
int length = 0;
byte[] buffer = new byte[1024];
while （-1 != （length = is.read（buffer））） {
os.write（buffer, 0, length）；
}
is.close（）；
os.close（）；
return SUCCESS;
}
}
上传成功后的页面uploadResult.jsp:
[html]
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title></title>
</head>
<body>
upload successfully!
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title></title>
</head>
<body>
upload successfully!
</body>
</html>
最后配置一下struts.xml
[html]
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<constant name="struts.i18n.encoding" value="UTF-8" />
<constant name="struts.multipart.maxSize" value="104857600" />
<package name="struts2" extends="struts-default">
<!-- 单文件上传 -->
<action name="upload" class="com.struts2.action.UploadAction">
<result name="success">/uploadResult.jsp</result>
</action>
</package>
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<constant name="struts.i18n.encoding" value="UTF-8" />
<constant name="struts.multipart.maxSize" value="104857600" />
<package name="struts2" extends="struts-default">
<!-- 单文件上传 -->
<action name="upload" class="com.struts2.action.UploadAction">
<result name="success">/uploadResult.jsp</result>
</action>
</package>
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