下載檔案類

package com.editxml;import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;public class HttpDownloader { private long downLoadFileSize = 0;
 public int m_DownSign = 0; public byte[] readStream(InputStream inputStream) throws Exception {
  ByteArrayOutputStream bout = new ByteArrayOutputStream();
  StringBuilder sb = new StringBuilder();
  BufferedReader reader = new BufferedReader(new InputStreamReader(
    inputStream, "gbk"), 8192);  String line = null;
  while ((line = reader.readLine()) != null) {
   sb.append(line + "\n");
  }
  reader.close();
  bout.close();
  inputStream.close();  return sb.toString().getBytes();
 } public int downFile(final String strUrl, final String strSavePath,
   final String strFileName) {
  m_DownSign = 0;
  new Thread() {
   public void run() {
    try {
     File fDir = new File(strSavePath);
     if (!fDir.exists()) {
      fDir.mkdir();
     }
     // 下載檔案
     HttpClient client = new DefaultHttpClient();
     HttpGet get = new HttpGet(strUrl + strFileName);
     HttpResponse response;
     response = client.execute(get);
     HttpEntity entity = response.getEntity();
     InputStream is = entity.getContent();
     FileOutputStream fileOutputStream = null;
     if (is != null) {
      File file = new File(strSavePath, strFileName);
      fileOutputStream = new FileOutputStream(file);
 

      byte[] buf = new byte[1024];       int ch = -1;       while ((ch = is.read(buf)) != -1) {        fileOutputStream.write(buf, 0, ch);        downLoadFileSize += ch;       }      }      fileOutputStream.flush();      if (fileOutputStream != null) {       fileOutputStream.close();      }     m_DownSign = 1;     } catch (ClientProtocolException e) {      e.printStackTrace();      m_DownSign = -1;     } catch (IOException e) {      e.printStackTrace();      m_DownSign = -1;     }    }   }.start();   while (m_DownSign == 0) {    try {     Thread.sleep(100);     continue;    } catch (InterruptedException e) {     // TODO Auto-generated catch block     e.printStackTrace();     m_DownSign = -1;     break;    }  }   return m_DownSign;  }}

呼叫

File fDir = Environment.getExternalStorageDirectory();
      if(fDir == null)
      {
       MsgShow("沒有發現儲存卡");
       return;
      }
      HttpDownloader downloader = new HttpDownloader();   
               int iDownSign = downloader.downFile("http://192.168.3.35:80/", fDir + "/DownFile/", "xxxxxx.xml");   
               if(iDownSign == 1)
               {
                MsgShow("下載完成");
               }
               else
               {
                MsgShow("下載失敗");
               }