JavaWeb_文件上传工具_java jsp 文件上传工具-优快云博客

本文介绍了一个使用Java Servlet和commons-fileupload库实现的文件上传系统。该系统通过JSP页面接收文件和描述信息，并利用Servlet处理上传过程，将文件保存到指定目录。

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两个jar包，commons-fileupload.jar和commons-io.jar

jsp：

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

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>My JSP 'upload.jsp' starting page</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">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
    	<form action = "uploadServlet" method="post" enctype="multipart/form-data">
    		File:<input type="file" name="file"/><br>
    		Desc:<input type="text" name="desc" />
    		<input type="submit" value="Submit"/>
    	</form>
  </body>
</html>

servlet：

package com.hcx.servlet;

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

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

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

public class uploadServlet extends HttpServlet {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
	
	//	boolean isMultipart= ServletFileUpload.isMultipartContent(request);
		//1.得到FileItem的集合items
		DiskFileItemFactory factory = new DiskFileItemFactory();
		factory.setSizeThreshold(1024*500);
		File file=new File("d:\\tempD");
		factory.setRepository(file);
		
		ServletFileUpload upload = new ServletFileUpload(factory);
		upload.setSizeMax(1024*1024*5);
		//2.遍历items
		try {
			List<FileItem> items=upload.parseRequest(request);
			//
			for(FileItem item : items){
					if (item.isFormField()) {
						String name=item.getFieldName();
						String value= item.getString();
						System.out.println("name:"+name+"value:"+value);
					}else{
						String fieldName = item.getFieldName();
						String fileName=item.getName();
						fileName=fileName.substring(fileName.lastIndexOf("\\")+1);
						String contentType = item.getContentType();
						boolean isInMemory =item.isInMemory();
						long sizeInBytes = item.getSize();
						
						System.out.println("1:"+fieldName);
						System.out.println("2:"+fileName);
						System.out.println("3:"+contentType);
						System.out.println("4:"+sizeInBytes);
						InputStream in = item.getInputStream();
						
						byte [] buffer= new byte[1024];
						int len = 0;
						
						fileName="d:\\files\\"+fileName;
						System.out.println(fileName);
						OutputStream out = new FileOutputStream(fileName);
						while( (len = in.read(buffer)) != -1){
							out.write(buffer, 0, len);
						}
						out.close();
						in.close();
					}
			}
		} catch (FileUploadException e) {
			e.printStackTrace();
		}
		} 
	}

控制台打印：

1:file
2:jquery-2.1.1.min.js
3:application/octet-stream
4:84245
d:\files\jquery-2.1.1.min.js
name:descvalue:aaaaaaaaaaaaaa