jsp\struts1.2\struts2 中文件上傳

剛剛做了三個文件上傳的Demo
a.在jsp中簡單利用Commons-fileupload組件實現
b.在struts1.2中實現
c.在sturts2中實現
現在把Code與大家分享一下..
注:此爲三個簡單Demo,僅供練習用,並沒有做太多上傳限制
如有興趣可以自行查看相關文檔說明

一.[b]在JSP環境中利用Commons-fileupload組件實現文件上傳[/b]
1.頁面upload.jsp清單如下:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>The FileUpload Demo</title>
  </head>

  <body>
    <form action="UploadFile" method="post" enctype="multipart/form-data">
    	<p><input type="text" name="fileinfo" value="">文件介紹</p>
    	<p><input type="file" name="myfile" value="瀏覽文件"></p>
    	<p><input type="submit" value="上 傳"></p>
    </form>
  </body>
</html>

注意:在上傳表單中,既有普通文本域也有文件上傳域

2.FileUplaodServlet.java清單如下:

package org.chris.fileupload;

import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.*;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class FileUplaodServlet extends HttpServlet {

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doPost(request, response);
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		request.setCharacterEncoding("UTF-8");

		//文件的上傳部分
		boolean isMultipart = ServletFileUpload.isMultipartContent(request);

		if(isMultipart)
		{
			try {
				FileItemFactory factory = new DiskFileItemFactory();
				ServletFileUpload fileload = new ServletFileUpload(factory);

//				 設置最大文件尺寸，這裏是4MB    
				fileload.setSizeMax(4194304);
				List<FileItem> files = fileload.parseRequest(request);
				Iterator<FileItem> iterator = files.iterator();	
				while(iterator.hasNext())
				{
					FileItem item = iterator.next();
					if(item.isFormField())
					{
						String name = item.getFieldName();
						String value = item.getString();
						System.out.println("表單域名爲: " + name + "值爲: " + value);
					}else
					{
						//獲得獲得文件名，此文件名包括路徑
						String filename = item.getName();
						if(filename != null)
						{
							File file = new File(filename);
							//如果此文件存在
							if(file.exists()){
								File filetoserver = new File("d:\\upload\\",file.getName());
								item.write(filetoserver);
								System.out.println("文件 " + filetoserver.getName() + " 上傳成功!!");
							}
						}
					}
				}
			} catch (Exception e) {
				System.out.println(e.getStackTrace());
			}
		}
	}
}

3.web.xml清單如下:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" 
	xmlns="http://java.sun.com/xml/ns/j2ee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
	http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

	<servlet>
		<servlet-name>UploadFileServlet</servlet-name>
		<servlet-class>
			org.chris.fileupload.FileUplaodServlet
		</servlet-class>
	</servlet>

	<servlet-mapping>
		<servlet-name>UploadFileServlet</servlet-name>
		<url-pattern>/UploadFile</url-pattern>
	</servlet-mapping>

	<welcome-file-list>
		<welcome-file>/Index.jsp</welcome-file>
	</welcome-file-list>

</web-app>

二.在strut1.2中實現
1.上傳頁面file.jsp 清單如下:

<%@ page language="java" pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-bean" prefix="bean"%> 
<%@ taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html"%>

<html> 
	<head>
		<title>JSP for FileForm form</title>
	</head>
	<body>
		<html:form action="/file" enctype="multipart/form-data">
		<html:file property="file1"></html:file>
			<html:submit/><html:cancel/>
		</html:form>
	</body>
</html>

2.FileAtion.java的清單如下:

/*
 * Generated by MyEclipse Struts
 * Template path: templates/java/JavaClass.vtl
 */
package action;

import java.io.*;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.upload.FormFile;

import form.FileForm;

/** 
 * @author Chris
 * Creation date: 6-27-2008
 * 
 * XDoclet definition:
 * @struts.action path="/file" name="fileForm" input="/file.jsp"
 */
public class FileAction extends Action {
	/*
	 * Generated Methods
	 */

	/** 
	 * Method execute
	 * @param mapping
	 * @param form
	 * @param request
	 * @param response
	 * @return ActionForward
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		FileForm fileForm = (FileForm) form;
		FormFile file1=fileForm.getFile1();
		if(file1!=null){
			//上傳路徑
			String dir=request.getSession(true).getServletContext().getRealPath("/upload");
			OutputStream fos=null;
			try {
				fos=new FileOutputStream(dir+"/"+file1.getFileName());
				fos.write(file1.getFileData(),0,file1.getFileSize());
				fos.flush();
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}finally{
				try{
				fos.close();
				}catch(Exception e){}
			}
		}
		//頁面跳轉
		return mapping.findForward("success");
	}
}

3.FileForm.java的清單如下:

package form;

import javax.servlet.http.HttpServletRequest;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.upload.FormFile;

/** 
 * @author Chris
 * Creation date: 6-27-2008
 * 
 * XDoclet definition:
 * @struts.form name="fileForm"
 */
public class FileForm extends ActionForm {
	/*
	 * Generated Methods
	 */
	private FormFile file1;
	/** 
	 * Method validate
	 * @param mapping
	 * @param request
	 * @return ActionErrors
	 */
	public ActionErrors validate(ActionMapping mapping,
			HttpServletRequest request) {
		// TODO Auto-generated method stub
		return null;
	}

	/** 
	 * Method reset
	 * @param mapping
	 * @param request
	 */
	public void reset(ActionMapping mapping, HttpServletRequest request) {
		// TODO Auto-generated method stub
	}

	public FormFile getFile1() {
		return file1;
	}

	public void setFile1(FormFile file1) {
		this.file1 = file1;
	}
}

4.struts-config.xml的清單如下:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd">

<struts-config>
  <data-sources />
  <form-beans >
    <form-bean name="fileForm" type="form.FileForm" />

  </form-beans>

  <global-exceptions />
  <global-forwards />
  <action-mappings >
    <action
      attribute="fileForm"
      input="/file.jsp"
      name="fileForm"
      path="/file"
      type="action.FileAction"
      validate="false">
       <forward name="success" path="/file.jsp"></forward>
      </action>

  </action-mappings>

  <message-resources parameter="ApplicationResources" />
</struts-config>

5.web.xml代碼清單如下:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.4" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee   http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
  <servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
    <init-param>
      <param-name>config</param-name>
      <param-value>/WEB-INF/struts-config.xml</param-value>
    </init-param>
    <init-param>
      <param-name>debug</param-name>
      <param-value>3</param-value>
    </init-param>
    <init-param>
      <param-name>detail</param-name>
      <param-value>3</param-value>
    </init-param>
    <load-on-startup>0</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>action</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>
</web-app>

三.在struts2中實現(以圖片上傳爲例)
1.FileUpload.jsp代碼清單如下:

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
  <head>
  	<title>The FileUplaodDemo In Struts2</title>
  </head>

  <body>
    <s:form action="fileUpload.action" method="POST" enctype="multipart/form-data">
    	<s:file name="myFile" label="MyFile" ></s:file>
    	<s:textfield name="caption" label="Caption"></s:textfield>
    	<s:submit label="提交"></s:submit>
    </s:form>
  </body>
</html>

2.ShowUpload.jsp的功能清單如下:

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
  <head>
    <title>ShowUpload</title>
  </head>

  <body>
    <div style ="padding: 3px; border: solid 1px #cccccc; text-align: center" > 
        <img src ='UploadImages/<s:property value ="imageFileName"/> '/>
        <br /> 
        <s:property value ="caption"/> 
    </div > 
  </body>
</html>

3.FileUploadAction.java的代碼清單如下 :

package com.chris;

import java.io.*;
import java.util.Date;

import org.apache.struts2.ServletActionContext;


import com.opensymphony.xwork2.ActionSupport;

public class FileUploadAction extends ActionSupport{

	 private static final long serialVersionUID = 572146812454l ;
     private static final int BUFFER_SIZE = 16 * 1024 ;

     //注意，文件上傳時<s:file/>同時與myFile，myFileContentType,myFileFileName綁定
     //所以同時要提供myFileContentType,myFileFileName的set方法

     private File myFile;	//上傳文件
     private String contentType;//上傳文件類型
     private String fileName;	//上傳文件名
     private String imageFileName;
     private String caption;//文件說明，與頁面屬性綁定

     public void setMyFileContentType(String contentType)  {
    	 System.out.println("contentType : " + contentType);
         this .contentType = contentType;
    } 

     public void setMyFileFileName(String fileName)  {
    	 System.out.println("FileName : " + fileName);
         this .fileName = fileName;
    } 

     public void setMyFile(File myFile)  {
         this .myFile = myFile;
    } 

     public String getImageFileName()  {
         return imageFileName;
    } 

     public String getCaption()  {
         return caption;
    } 

      public void setCaption(String caption)  {
         this .caption = caption;
    } 

     private static void copy(File src, File dst)  {
         try  {
            InputStream in = null ;
            OutputStream out = null ;
             try  {                
                in = new BufferedInputStream( new FileInputStream(src), BUFFER_SIZE);
                out = new BufferedOutputStream( new FileOutputStream(dst), BUFFER_SIZE);
                 byte [] buffer = new byte [BUFFER_SIZE];
                 while (in.read(buffer) > 0 )  {
                    out.write(buffer);
                } 
             } finally  {
                 if ( null != in)  {
                    in.close();
                } 
                  if ( null != out)  {
                    out.close();
                } 
            } 
         } catch (Exception e)  {
            e.printStackTrace();
        } 
    } 

     private static String getExtention(String fileName)  {
         int pos = fileName.lastIndexOf(".");
         return fileName.substring(pos);
    } 

    @Override
     public String execute()      {        
        imageFileName = new Date().getTime() + getExtention(fileName);
        File imageFile = new File(ServletActionContext.getServletContext().getRealPath("/UploadImages" ) + "/" + imageFileName);
        copy(myFile, imageFile);
         return SUCCESS;
    }
}

注:此時僅爲方便實現Action所以繼承ActionSupport,並Overrider execute()方法
在struts2中任何一個POJO都可以作爲Action

4.struts.xml清單如下:

<?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>
	<package name="example" namespace="/" extends="struts-default">
		<action name="fileUpload" class="com.chris.FileUploadAction">
		<interceptor-ref name="fileUploadStack"/>
		<result>/ShowUpload.jsp</result>
		</action>
	</package>
</struts>

5.web.xml清單如下:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" 
	xmlns="http://java.sun.com/xml/ns/j2ee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
	http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
	<filter > 
        <filter-name > struts-cleanup </filter-name > 
        <filter-class > 
            org.apache.struts2.dispatcher.ActionContextCleanUp
        </filter-class > 
    </filter > 
     <filter-mapping > 
        <filter-name > struts-cleanup </filter-name > 
        <url-pattern > /* </url-pattern > 
    </filter-mapping >

	<filter>
		<filter-name>struts2</filter-name>
		<filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>struts2</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
  <welcome-file-list>
    <welcome-file>Index.jsp</welcome-file>
  </welcome-file-list>

</web-app>

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