Java开发过程中文件上传的各种方式全面总结

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Java Struts Servlet Apache JSP

到目前为止：我接触到的有关上传的类型有这么几种
JSP+Servlet的，Struts2的，Struts的，FTP的，ExtJs的,Flex的

最终还是建议看看，后面详细写的Struts2的上传文章最为实用

第一：JSP+Servlet上传
这个最基础的上传示例[其实也可以完全在JSP上进行处理]
我选用的包是Apache commons fileupload.jar
下载地址:http://jakarta.apache.org/commons/fileupload/

JSP页面具体代码

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
  <head>
    <title>JSP+Servlet上传示例</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
  </head>
  <body>
       <form action="upload.do" method="post" enctype="multipart/form-data">
      <input type ="file" name="file1" id="file1" /><br/>
      <input type ="file" name="file2" if="file2"/><br/>
      <input type ="file" name="file3" id="file3"/><br/>
       <input type="submit" value="上传" /> 
       </form>
  </body>
</html>

上面文件中有几个需要注意的地方就是
1. action="UploadServlet" 必须和后面的web.xml配置文件中对servlet映射必须保持一致.
2. method="POST" 这里必须为"POST"方式提交不能是"GET".
3. enctype="multipart/form-data" 这里是要提交的内容格式,表示你要提交的是数据流,而不是普通的表单

文本.
4. file1,file2,file3表示你要3个文件一起上传,你也可以一次只上传一个文件.

Servlet处理类程序

package com.upload.test;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.util.Streams;

public class UploadServlet extends HttpServlet {
	
	File tmpDir = null;//初始化上传文件的临时存放目录
	File saveDir = null;//初始化上传文件后的保存目录
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		this.doPost(request, response);
	}
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("utf-8");
		try{
			if(ServletFileUpload.isMultipartContent(request)){
			DiskFileItemFactory dff = new DiskFileItemFactory();//创建该对象
			dff.setRepository(tmpDir);// 指定上传文件的临时目录
			dff.setSizeThreshold(1024000);//指定在内存中缓存数据大小,单位为byte
			ServletFileUpload sfu = new ServletFileUpload(dff);//创建该对象
			sfu.setFileSizeMax(5000000);// 指定单个上传文件的最大尺寸
			sfu.setSizeMax(10000000);//指定一次上传多个文件的 总尺寸
			FileItemIterator fii = sfu.getItemIterator(request);//解析request 请求,

并返回FileItemIterator集合
			while(fii.hasNext()){
			FileItemStream fis = fii.next();//从集合中获得一个文件流
			if(!fis.isFormField() && fis.getName().length()>0){//过滤掉表单中非文件

域
			String fileName = fis.getName().substring(fis.getName().lastIndexOf

("\\"));//获得上传文件的文件名
			BufferedInputStream in = new BufferedInputStream(fis.openStream());//获

得文件输入流
			BufferedOutputStream out = new BufferedOutputStream(new 

FileOutputStream(new File(saveDir+fileName)));//获得文件输出流
			Streams.copy(in, out, true);//开始把文件写到你指定的上传文件夹
			}
			}
			response.getWriter().println("File upload successfully!!!");//终于成功了

,还不到你的上传文件中看看,你要的东西都到齐了吗
			}
			}catch(Exception e){
			e.printStackTrace();
			}
	}
	@Override
	public void init() throws ServletException {
		super.init();
		/* 对上传文件夹和临时文件夹进行初始化
		*
		*/
		String tmpPath = "c:\\tmpdir";
		String savePath = "c:\\updir";
		tmpDir = new File(tmpPath);
		saveDir = new File(savePath);
		if(!tmpDir.isDirectory())
		tmpDir.mkdir();
		if(!saveDir.isDirectory())
		saveDir.mkdir();

	}
	
}

第二：struts2的上传吧
upload.jsp-----------

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()

+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  </head>  
<body>
 <s:form action="test.action" method="POST" enctype="multipart/form-data">
 <s:file label="选择文件" name="upFile"></s:file>
 <s:submit label="上传" />
 </s:form>
</body>
</html>

UploadAction----------------

package com.upload.test;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport {
	private File   upFile;
	 private String upFileFileName;  //上传的文件名 (1.系统自动注入  2.变量命名有规则: 前台

对象名+"FileName")
	 private String upFileContentType; //文件类型           (1.系统自动注入  2.变量命名有规

则: 前台对象名+"ContentType")
	 private String savePath;
	 
	 
	 @Override
	 public String execute() throws Exception {
	  System.out.println("xxxxxxxxxxxxxxxxxxxxxxxxxxx");
	  String path = "c:/" + upFileFileName;
	  BufferedInputStream bis = null;
	  BufferedOutputStream bos = null;
	  
	  try{
	   bis = new BufferedInputStream(new FileInputStream(upFile));
	   bos = new BufferedOutputStream(new FileOutputStream(path));
	   byte[] buf = new byte[(int)upFile.length()];
	   int len = 0;
	   while(((len=bis.read(buf))!=-1)){
	    bos.write(buf, 0, len);
	   }
	  }catch(Exception e){
	   e.printStackTrace();
	  }finally{
	    try{
	      if(bos!=null){
	       bos.close();
	      }
	      if(bis!=null){
	       bis.close();
	      }
	    }catch(Exception e){
	   bos = null;
	   bis = null;
	    }
	  }
	        
	  return SUCCESS;
	 }

	 
	 public File getUpFile() {
	  return upFile;
	 }

	 public void setUpFile(File upFile) {
	  this.upFile = upFile;
	 }

	 public String getUpFileFileName() {
	  return upFileFileName;
	 }

	 public void setUpFileFileName(String upFileFileName) {
	  this.upFileFileName = upFileFileName;
	 }

	 public String getUpFileContentType() {
	  return upFileContentType;
	 }

	 public void setUpFileContentType(String upFileContentType) {
	  this.upFileContentType = upFileContentType;
	 }

	 public String getSavePath() {
	  return savePath;
	 }

	 public void setSavePath(String savePath) {
	  this.savePath = savePath;
	 }

 
}

struts.xml-------

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" 

"http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
  <!-- 该属性指定Struts 2文件上传中整个请求内容允许的最大字节数 -->
<constant name="struts.multipart.maxSize" value="102400000000000" />
<package name="default" extends="struts-default" >
   <action name="test" class="com.upload.test.TestAction">
   <result >/index.jsp</result>
   </action>
  
 </package>

</struts>

web.xml------

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
	xmlns="http://java.sun.com/xml/ns/javaee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
	http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  <filter>
  	<filter-name>struts2</filter-name>
  	<filter-class>
  		org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
  	</filter-class>
  </filter>
  <filter-mapping>
  	<filter-name>struts2</filter-name>
  	<url-pattern>/*</url-pattern>
  	</filter-mapping>
 </web-app>

特别说明这条的必要性，可以使你上传任意大小文件
<constant name="struts.multipart.maxSize" value="102400000000000" />

关于FLEX的上传在我博客文章：http://javacrazyer.iteye.com/blog/707693
关于EXT的上传在我博客文章：http://javacrazyer.iteye.com/blog/707510
关于FTP的上传在我的博客文章：http://javacrazyer.iteye.com/blog/675440
关于Struts的上传在我的博客文章： http://javacrazyer.iteye.com/blog/619016

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Flex4之DataGrid四个的示例【客户端和服务 ... | Flex4之基于Servlet的文件上传

2010-07-07 17:54
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