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Servlet 上传文件

2015-09-25 21:08 381 查看

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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