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   源码介绍

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简单的上传实例，适合初学者，一看就懂

package com.test;

import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class Main extends Activity {
	  /* 变量声明
	   * newName：上传后在服务器上的文件名称
	   * uploadFile：要上传的文件路径
	   * actionUrl：服务器上对应的程序路径 */
	  private String newName="image.jpg";
	  private String uploadFile="/data/image.jpg";
	  private String actionUrl="http://l27.0.0.1/upload/upload.jsp";
	  private TextView mText1;
	  private TextView mText2;
	  private Button mButton;

	  @Override
	  public void onCreate(Bundle savedInstanceState)
	  {
	    super.onCreate(savedInstanceState);
	    setContentView(R.layout.main);

	    mText1 = (TextView) findViewById(R.id.myText2);
	    mText1.setText("文件路径：\n" uploadFile);
	    mText2 = (TextView) findViewById(R.id.myText3);
	    mText2.setText("上传网址：\n" actionUrl);
	    /* 设置mButton的onClick事件处理 */    
	    mButton = (Button) findViewById(R.id.myButton);
	    mButton.setOnClickListener(new View.OnClickListener()
	    {
	      public void onClick(View v)
	      {
	        uploadFile();
	      }
	    });
	  }

	  /* 上传文件至Server的方法 */
	  private void uploadFile()
	  {
	    String end = "\r\n";
	    String twoHyphens = "--";
	    String boundary = "*****";
	    try
	    {
	      URL url =new URL(actionUrl);
	      HttpURLConnection con=(HttpURLConnection)url.openConnection();
	      /* 允许Input、Output，不使用Cache */
	      con.setDoInput(true);
	      con.setDoOutput(true);
	      con.setUseCaches(false);
	      /* 设置传送的method=POST */
	      con.setRequestMethod("POST");
	      /* setRequestProperty */
	      con.setRequestProperty("Connection", "Keep-Alive");
	      con.setRequestProperty("Charset", "UTF-8");
	      con.setRequestProperty("Content-Type",
	                         "multipart/form-data;boundary=" boundary);
	      /* 设置DataOutputStream */
	      DataOutputStream ds = 
	        new DataOutputStream(con.getOutputStream());
	      ds.writeBytes(twoHyphens   boundary   end);
	      ds.writeBytes("Content-Disposition: form-data; "  
	                    "name=\"file1\";filename=\""  
	                    newName  "\""   end);
	      ds.writeBytes(end);   

	      /* 取得文件的FileInputStream */
	      FileInputStream fStream = new FileInputStream(uploadFile);
	      /* 设置每次写入1024bytes */
	      int bufferSize = 1024;
	      byte[] buffer = new byte[bufferSize];

	      int length = -1;
	      /* 从文件读取数据至缓冲区 */
	      while((length = fStream.read(buffer)) != -1)
	      {
	        /* 将资料写入DataOutputStream中 */
	        ds.write(buffer, 0, length);
	      }
	      ds.writeBytes(end);
	      ds.writeBytes(twoHyphens   boundary   twoHyphens   end);

	      /* close streams */
	      fStream.close();
	      ds.flush();

	      /* 取得Response内容 */
	      InputStream is = con.getInputStream();
	      int ch;
	      StringBuffer b =new StringBuffer();
	      while( ( ch = is.read() ) != -1 )
	      {
	        b.append( (char)ch );
	      }
	      /* 将Response显示于Dialog */
	      showDialog(b.toString().trim());
	      /* 关闭DataOutputStream */
	      ds.close();
	    }
	    catch(Exception e)
	    {
	      showDialog("" e);
	    }
	  }

	  /* 显示Dialog的method */
	  private void showDialog(String mess)
	  {
	    new AlertDialog.Builder(Main.this).setTitle("Message")
	     .setMessage(mess)
	     .setNegativeButton("确定",new DialogInterface.OnClickListener()
	     {
	       public void onClick(DialogInterface dialog, int which)
	       {          
	       }
	     })
	     .show();
	  }
}