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   源码介绍

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服务器端代码：

package com.easyway.fileupload;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.List;

import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
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;
/**
 * 文件上传的Serlvet类
 * 
 * Servlet implementation class FileImageUploadServlet
 * 
 *    此处的文件上传比较简单没有处理各种验证，文件处理的错误等。
 * 如果需要处理，请修改源代码即可。
 * @Title: 
 * @Description: 实现TODO
 * @Copyright:Copyright (c) 2011
 * @Company:易程科技股份有限公司
 * @Date:2012-7-22
 * @author  longgangbai
 * @version 1.0
 */
public class FileImageUploadServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
	private ServletFileUpload upload;
	private final long MAXSize = 4194304*2L;//4*2MB
	private String filedir=null;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public FileImageUploadServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * 设置文件上传的初始化信息
	 * @see Servlet#init(ServletConfig)
	 */
	public void init(ServletConfig config) throws ServletException {
		FileItemFactory factory = new DiskFileItemFactory();// Create a factory for disk-based file items
		this.upload = new ServletFileUpload(factory);// Create a new file upload handler
		this.upload.setSizeMax(this.MAXSize);// Set overall request size constraint 4194304
		filedir=config.getServletContext().getRealPath("images");
		System.out.println("filedir=" filedir);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	@SuppressWarnings("unchecked")
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		PrintWriter out=response.getWriter();
		try {
			List<FileItem> items = this.upload.parseRequest(request);
			if(items!=null	&& !items.isEmpty()){
				for (FileItem fileItem : items) {
					String filename=fileItem.getName();
					String filepath=filedir File.separator filename;
					System.out.println("文件保存路径为:" filepath);
					File file=new File(filepath);
					InputStream inputSteam=fileItem.getInputStream();
					BufferedInputStream fis=new BufferedInputStream(inputSteam);
				    FileOutputStream fos=new FileOutputStream(file);
				    int f;
				    while((f=fis.read())!=-1)
				    {
				       fos.write(f);
				    }
				    fos.flush();
				    fos.close();
				    fis.close();
					inputSteam.close();
					System.out.println("文件：" filename "上传成功!");
				}
			}
			System.out.println("上传文件成功!");
			out.write("上传文件成功!");
		} catch (FileUploadException e) {
			e.printStackTrace();
			out.write("上传文件失败:" e.getMessage());
		}
	}

}

android端代码：

public static String uploadFile(File file,String RequestURL)
{
String  BOUNDARY =  UUID.randomUUID().toString();  //边界标识   随机生成
String PREFIX = "--" , LINE_END = "\r\n"; 
String CONTENT_TYPE = "multipart/form-data";   //内容类型

try {
URL url = new URL(RequestURL);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(TIME_OUT);
conn.setConnectTimeout(TIME_OUT);
conn.setDoInput(true);  //允许输入流
conn.setDoOutput(true); //允许输出流
conn.setUseCaches(false);  //不允许使用缓存
conn.setRequestMethod("POST");  //请求方式
conn.setRequestProperty("Charset", CHARSET);  //设置编码
conn.setRequestProperty("connection", "keep-alive");   
conn.setRequestProperty("Content-Type", CONTENT_TYPE ";boundary=" BOUNDARY); 
if(file!=null)
{
/**
* 当文件不为空，把文件包装并且上传
*/
OutputStream outputSteam=conn.getOutputStream();

DataOutputStream dos = new DataOutputStream(outputSteam);
StringBuffer sb = new StringBuffer();
sb.append(PREFIX);
sb.append(BOUNDARY);
sb.append(LINE_END);
/**
* 这里重点注意：
* name里面的值为服务器端需要key   只有这个key 才可以得到对应的文件
* filename是文件的名字，包含后缀名的   比如:abc.png  
*/

sb.append("Content-Disposition: form-data; name=\"img\"; filename=\"" file.getName() "\"" LINE_END); 
sb.append("Content-Type: application/octet-stream; charset=" CHARSET LINE_END);
sb.append(LINE_END);
dos.write(sb.toString().getBytes());
InputStream is = new FileInputStream(file);
byte[] bytes = new byte[1024];
int len = 0;
while((len=is.read(bytes))!=-1)
{
dos.write(bytes, 0, len);
}
is.close();
dos.write(LINE_END.getBytes());
byte[] end_data = (PREFIX BOUNDARY PREFIX LINE_END).getBytes();
dos.write(end_data);
dos.flush();
/**
* 获取响应码  200=成功
* 当响应成功，获取响应的流  
*/
int res = conn.getResponseCode();  
Log.e(TAG, "response code:" res);
if(res==200)
{
    return SUCCESS;
}
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}