struts2学习笔记十四（第14讲.Struts2的文件上传和下载续二）

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JSP Struts Java OS Apache

Struts2的文件上传和下载续二
说明：使用struts2的框架来实现文件的上传下载。
把之前在web.xml中注释掉的关于filter的代码恢复。
一、在WebRoot根目录下创建一个upload.jsp页面，这个页面是用struts2来实现的：

<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="GB18030"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!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>

<s:form action="upload" theme="simple">
    
    	<table align="center" width="40%" border="1">
    		<tr>
    			<td>username
    			</td>
    			<td>
    				<s:textfield name="username" ></s:textfield>
    			</td>
    		</tr>
    		<tr><td>password</td>
    			<td>
    				<s:password name="password" ></s:password>
    			</td>
    		</tr>	
    		
    		<tr><td>file</td>
    			<td>
    				<s:file name="file"></s:file>
    			</td>
    		</tr>
    		
    		<tr><td><s:submit value=" submit "></s:submit></td>
    			<td>
    				<s:reset value=" reset "></s:reset>
    			</td>
    		</tr>
    	</table>	
    </s:form>

</body>

</html>

二、在struts2.xml中配置上传文件的Action，并且注视掉全部关于拦截器的配置，以便不会造成干扰：

<?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>
	
	<constant name="struts.custom.i18n.resources" value="message">
	
	</constant>
	
	<package name="struts2" extends="struts-default">
		
		<!-- 
		<interceptors>
			<interceptor name="myInterceptor" class="com.test.interceptor.MyInterceptor">
				<param name="hello">world</param>
			</interceptor>
			
			<interceptor name="myInterceptor2" class="com.test.interceptor.MyInterceptor2">
			</interceptor>
			
			<interceptor name="myInterceptor3" class="com.test.interceptor.MyInterceptor3">
			</interceptor>
			
			<interceptor name="auth" class="com.test.interceptor.AuthInterceptor">
			</interceptor>
			
			<interceptor-stack name="myStack">
			
			
				<interceptor-ref name="myInterceptor"></interceptor-ref>
				<interceptor-ref name="myInterceptor2"></interceptor-ref> 
			
				
				<interceptor-ref name="defaultStack"></interceptor-ref>
			</interceptor-stack>
		</interceptors>
	
		<default-interceptor-ref name="myStack"></default-interceptor-ref>
		-->
		
		<global-results>
			<result name="login" type="redirect">/login2.jsp</result>
		</global-results>
		
		<action name="login" class="com.test.action.LoginAction">
			<result name="input">/login2.jsp</result>
			<result name="success">/register2.jsp</result>
			<result name="failer">login2.jsp</result>
		</action>
		
		<action name="pointConverter" class="com.test.action.PointAction">
			<result name="success">/output.jsp</result>
		</action>
		
		<action name="register" class="com.test.action.RegisterAction" method="test">
			<result name="success">/success.jsp</result>
			<result name="input">/register2.jsp</result>
			
			<!-- 
			<interceptor-ref name="auth"></interceptor-ref>
			<interceptor-ref name="defaultStack"></interceptor-ref>
			
			
			<interceptor-ref name="myInterceptor3">
				<param name="excludeMethods">test,execute</param>
				<param name="includeMethods">test</param>
			</interceptor-ref>
			<interceptor-ref name="defaultStack"></interceptor-ref>
			 -->
		</action>
		
		<action name="upload" class="com.test.action.UploadAction">
			<result name="success">/uploadResult.jsp</result>		
		</action>
		
		
	</package>
	
</struts>

三、在WebRoot根目录下创建一个显示信息的页面uploadResult.jsp：

<%@ page language="java" contentType="text/html; charset=GB18030"
    pageEncoding="GB18030"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
    
<!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>

username: <s:property value="username"/><br>

password: <s:property value="password"/><br>

file: <s:property value="fileFileName"/>

</body>
</html>

说明：用struts2实现上传功能已经完成，但是当表单中输入汉字的时候会出现乱码现象，如下图：

解决的方法实在struts添加constant属性：<constant name="struts.i18n.encoding" value="gbk">
</constant>
<constant name="struts.multipart.saveDir" value="c:\"></constant>。修改之后如图：

功能：实现多个文件的上传，使用的是List列表来实现。
四、修改UploadAction.java文件：

package com.test.action;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport {

	private String username;
	
	private String password; 
	
	private List<File> file;
	
	private List<String> fileFileName;
	
	private List<String> fileContentType;

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	public List<File> getFile() {
		return file;
	}

	public void setFile(List<File> file) {
		this.file = file;
	}

	public List<String> getFileFileName() {
		return fileFileName;
	}

	public void setFileFileName(List<String> fileFileName) {
		this.fileFileName = fileFileName;
	}

	public List<String> getFileContentType() {
		return fileContentType;
	}

	public void setFileContentType(List<String> fileContentType) {
		this.fileContentType = fileContentType;
	}

	@Override
	public String execute() throws Exception {
		
		for(int i = 0 ; i < file.size() ; ++i){
			
			InputStream is = new FileInputStream(file.get(i));
			
			String root = ServletActionContext.getRequest().getRealPath("/upload");
			
			File destFile = new File(root,this.getFileFileName().get(i));
			
			OutputStream os = new FileOutputStream(destFile);
			
			byte[] buffer = new byte[400];
			
			int length = 0;
			
			while((length = is.read(buffer)) > 0){
				
				os.write(buffer,0,length);
			}
			
			is.close();
			
			os.close();
		}
		return SUCCESS;
	}
}

五、修改一下文件上传的页面upload.jsp，再添加两个上传的控件：

<body>

<s:form action="upload" theme="simple" enctype="multipart/form-data" method="post">
    
    	<table align="center" width="40%" border="1">
    		<tr>
    			<td>username
    			</td>
    			<td>
    				<s:textfield name="username" ></s:textfield>
    			</td>
    		</tr>
    		<tr><td>password</td>
    			<td>
    				<s:password name="password" ></s:password>
    			</td>
    		</tr>	
    		
    		<tr><td>file1</td>
    			<td>
    				<s:file name="file"></s:file>
    			</td>
    		</tr>
    		<tr><td>file2</td>
    			<td>
    				<s:file name="file"></s:file>
    			</td>
    		</tr>
    		<tr><td>file3</td>
    			<td>
    				<s:file name="file"></s:file>
    			</td>
    		</tr>
    		
    		<tr><td><s:submit value=" submit "></s:submit></td>
    			<td>
    				<s:reset value=" reset "></s:reset>
    			</td>
    		</tr>
    	</table>	
    </s:form>

</body>

显示效果如图：