Android实现上传文件功能的方法

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();  }}