hadoop网盘的最终效果见下面,可以实现简单的文件上传、删除、下载功能,不同用户可以登录到自己的页面进行管理。

一、准备的安装包资源

(1)hadoop1.1.2安装包

(2)bootmetro一个CSS开元框架,用来提高web前端的开发效率

(3)mysql的Jdbc驱动包

(4)上传组件

(5)mysql安装包(我的电脑是x64,x86系统的请下载对应版本即可)

二、搭建hadoop集群环境

教程见(2)虚拟机下hadoop1.1.2集群环境搭建

三、mysql5.6安装和eclipse上的配置

(1)安装教程网上很多,这里就不详细列举,大家到网上搜索即可。

A、安装好后,把mysql安装文件夹下的bin目录的路径添加到PATH环境变量里。

B、然后打开cmd,输入mysqld,开启mysql服务。

C、创建hadoop数据库

打开cmd,输入:mysql  -uroot -hlocalhost -p

然后会提示输入密码:密码默认为空,所以直接回车就可以进入Mysql命令行。

接下来输入:create database hadoop;就创建成功

我们输入:show databases; 来查看

(2)在eclipse上配置mysql

A、首先打开eclipse,创建web工程。

B、把mysql-connector-java-commercial-5.1.25.jar包复制到在WEB-INF/lib下。

C、链接hadoop数据库

在Window菜单栏下打开Open Perspertive,选择 Database Development。

然后再Database Connections文件夹下邮件选择New ..;

然后再URL上填上刚刚创建的hadoop数据库;

点击 Test Connection,测试链接成功。

四、fileupload控件实现文件的上传

(1)首先将commons-fileupload-1.3.1.jar和commons-io-2.4.jar复制到WEB-INF/lib目录下。

(2)在WebContent/下创建inedx.jsp文件用于上传文件。

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!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=UTF-8">
<title>Insert title here</title>
</head>
<body>
	   <form class="form-inline"  method="POST"  enctype="MULTIPART/FORM-DATA"   action="UploadServlet" >
		   <div style="line-height:50px;float:left;">
		  	  <input type="submit" name="submit" value="上传文件"  />
		   </div>  
		   <div style="line-height:50px;float:left;">
		  	  <input type="file" name="file1" size="30"/>
		   </div>  
</form>
</body>
</html>

然后再创建一个UploadServlet处理上传的文件。

package com.controller;

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

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.PageContext;

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

/**
 * Servlet implementation class UploadServlet
 */
public class UploadServlet extends HttpServlet {
 
	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		this.doPost(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		   request.setCharacterEncoding("UTF-8");
		   File file ;
		   int maxFileSize = 50 * 1024 *1024;  //50M
		   int maxMemSize = 50 * 1024 *1024;    //50M
		   ServletContext context = getServletContext();
		   String filePath = context.getInitParameter("file-upload");
			System.out.println("source file path:"+filePath+"");
		   // 验证上传内容了类型
		   String contentType = request.getContentType();
		   if ((contentType.indexOf("multipart/form-data") >= 0)) {

		      DiskFileItemFactory factory = new DiskFileItemFactory();
		      // 设置内存中存储文件的最大值
		      factory.setSizeThreshold(maxMemSize);
		      // 本地存储的数据大于 maxMemSize.
		      factory.setRepository(new File("c:\\temp"));

		      // 创建一个新的文件上传处理程序
		      ServletFileUpload upload = new ServletFileUpload(factory);
		      // 设置最大上传的文件大小
		      upload.setSizeMax( maxFileSize );
		      try{ 
		         // 解析获取的文件
		         List fileItems = upload.parseRequest(request);

		         // 处理上传的文件
		         Iterator i = fileItems.iterator();

		         System.out.println("begin to upload file to tomcat server</p>"); 
		         while ( i.hasNext () ) 
		         {
		            FileItem fi = (FileItem)i.next();
		            if ( !fi.isFormField () )	
		            {
		            // 获取上传文件的参数
		            String fieldName = fi.getFieldName();
		            String fileName = fi.getName();
		            
		            String fn = fileName.substring( fileName.lastIndexOf("\\")+1);
		            System.out.println("<br>"+fn+"<br>");
		            boolean isInMemory = fi.isInMemory();
		            long sizeInBytes = fi.getSize();
		            // 写入文件
		            if( fileName.lastIndexOf("\\") >= 0 ){
		            file = new File( filePath , 
		            fileName.substring( fileName.lastIndexOf("\\"))) ;
		            //out.println("filename"+fileName.substring( fileName.lastIndexOf("\\"))+"||||||");
		            }else{
		            file = new File( filePath ,
		            fileName.substring(fileName.lastIndexOf("\\")+1)) ;
		            }
		            fi.write( file ) ;
		            System.out.println("upload file to tomcat server success!");
		            
		            request.getRequestDispatcher("index.jsp").forward(request, response);
		            
		            }
		         }
		      }catch(Exception ex) {
		         System.out.println(ex);
		      }
		   }else{
		      System.out.println("<p>No file uploaded</p>"); 
		
		   }
	 
	      
		 
	}

}

然后再web.xml下设置上传的路径:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>TestHadoop</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <servlet>
    <description></description>
    <display-name>UploadServlet</display-name>
    <servlet-name>UploadServlet</servlet-name>
    <servlet-class>com.controller.UploadServlet</servlet-class>
  </servlet>
  <context-param>
    <description>Location to store uploaded file</description>
    <param-name>file-upload</param-name>
    <param-value>
         D:\apache-tomcat-6.0.41\webapps\data
     </param-value>
  </context-param>
  <servlet-mapping>
    <servlet-name>UploadServlet</servlet-name>
    <url-pattern>/UploadServlet</url-pattern>
  </servlet-mapping>
</web-app>

我们测试一下是否可以上传,我现在将上传(1)Centos6.5下hadoop1.1.2环境搭建(单机版).docx文件;

我们到

 D:\apache-tomcat-6.0.41\webapps\data

可以看到文件已经上传成功。

 

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