Servlet 上传文件

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package com.busymonkey;import java.io.File;  import java.io.FileInputStream;import java.io.IOException;  import java.io.OutputStream;import java.net.URI;import java.util.Iterator;  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.FileItemFactory;  import org.apache.commons.fileupload.FileUploadException;  import org.apache.commons.fileupload.disk.DiskFileItemFactory;  import org.apache.commons.fileupload.servlet.ServletFileUpload;  import org.apache.hadoop.fs.*;import org.apache.hadoop.conf.Configuration;import org.apache.hadoop.io.IOUtils;  public class HadoopDownload extends HttpServlet {      /** *  */private static final long serialVersionUID = 1L;protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {          req.setCharacterEncoding("UTF-8");          fileControl(req, resp);      }        /**       * 上传文件的处理       */     private void fileControl(HttpServletRequest req, HttpServletResponse resp) throws ServletException {            // 在解析请求之前先判断请求类型是否为文件上传类型          boolean isMultipart = ServletFileUpload.isMultipartContent(req);            // 文件上传处理工厂          FileItemFactory factory = new DiskFileItemFactory();            // 创建文件上传处理器          ServletFileUpload upload = new ServletFileUpload(factory);            // 开始解析请求信息          List items = null;          try {              items = upload.parseRequest(req);          }          catch (FileUploadException e) {              e.printStackTrace();          }            // 对所有请求信息进行判断          Iterator iter = items.iterator();          while (iter.hasNext()) {              FileItem item = (FileItem) iter.next();              // 信息为普通的格式              if (item.isFormField()) {                  String fieldName = item.getFieldName();                  String value = item.getString();  //              String basePath = req.getRealPath("/home/hou/");         req.setAttribute(fieldName, value);              }              // 信息为文件格式              else {                  String fileName = item.getName();                  int index = fileName.lastIndexOf("\\");                  fileName = fileName.substring(index + 1);                  fileName = "123456.txt";                req.setAttribute("realFileName", fileName);                    // 将文件写入  //                String path = req.getContextPath();  //                String directory = "uploadFile";  //                String basePath = "/home/hou/workspace/";   //                String basePath = req.getRealPath("/home/hou/");                 String basePath = "/home/hou/workspace/";                File file = new File(basePath, fileName);                  try {                      item.write(file);                      String target = "hdfs://10.19.155.41:9000/newfile/123.txt";                    FileInputStream fis = new FileInputStream(new File("/home/hou/workspace/123456.txt"));                    Configuration config = new Configuration();                    FileSystem fs = FileSystem.get(URI.create(target), config);                    OutputStream os = fs.create(new Path(target));                    IOUtils.copyBytes(fis, os, 4096, true);                }                  catch (Exception e) {                      e.printStackTrace();                  }              }          }    //        try {  //            req.getRequestDispatcher("/download").forward(req, resp);  //        }  //        catch (IOException e) {  //            e.printStackTrace();  //        }      }  }

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%>     <%   String path = request.getContextPath();   String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";   %><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html>     <head>       <base href="<%=basePath%>">              <title>文件上传</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="download" method="post" enctype="multipart/form-data">              文件别名:<input type="text" name="filename"><br>              选择文件:<input type="file" name="fileupload"><br>              <input type="submit" value="提交">                    </form>     </body>   </html>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>hadoop</groupId>
<artifactId>hadoopDownload</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>hadoopDownload Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>

    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>servlet-api</artifactId>
        <version>2.5</version>
        <scope>provided</scope>
    </dependency>

    <dependency>
        <groupId>org.apache.hadoop</groupId>
        <artifactId>hadoop-common</artifactId>
        <version>2.6.0</version>
    </dependency>
    <dependency>
        <groupId>org.apache.hadoop</groupId>
        <artifactId>hadoop-hdfs</artifactId>
        <version>2.6.0</version>
    </dependency>
    
    <dependency>
        <groupId>jdk.tools</groupId>
        <artifactId>jdk.tools</artifactId>
        <version>1.7</version>
        <scope>system</scope>
        <systemPath>/home/hou/java/jdk1.7.0_79/lib/tools.jar</systemPath>
    </dependency>
</dependencies>
<build>
    <finalName>hadoopDownload</finalName>
</build>
</project>

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:javaee="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  <javaee:display-name>Archetype Created Web Application</javaee:display-name>  <servlet>    <servlet-name>HadoopDownload</servlet-name>    <servlet-class>com.busymonkey.HadoopDownload</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>HadoopDownload</servlet-name>    <url-pattern>/download</url-pattern>  </servlet-mapping></web-app>

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