Android文件下载

客户端

package com.example.ygx;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.UUID;

import org.apache.http.HeaderElement;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.NameValuePair;
import org.apache.http.StatusLine;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

import android.R.string;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.preference.PreferenceActivity.Header;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

public class DownloadDemo extends Activity {
    private TextView txtTips;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.download);
        
    
        final EditText txtUrl=(EditText)findViewById(R.id.editText1);
        final Button btnDown=(Button)findViewById(R.id.button1);
        txtTips=(TextView)findViewById(R.id.textView1);
       
        
        btnDown.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                new LoginTask().execute();
            }
        });

    }
    
    class LoginTask extends AsyncTask<String, Integer, Object>{

        private ProgressDialog dialog;
        
        @Override
        protected Object doInBackground(String... params) {
        
                try {
                    // "http://192.168.1.7:7086/account/getUsers";//
                    String httpUrl = "http://192.168.1.7:7086/down/login?username=xxx2&password=bbb";
                    // HttpGet连接对象
                    HttpGet httpRequest = new HttpGet(httpUrl);
                    
                    // 取得HttpClient对象
                    HttpClient httpClient =HttpUtil.create();
                    // 请求HttpClient，取得HttpResponse
                    HttpResponse httpResponse = httpClient.execute(httpRequest);
            
                    // 请求成功
                    if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                        
                        org.apache.http.Header header= httpResponse.getFirstHeader("Set-Cookie");
                        if(header!=null){
                           //获取SessionId
                           for(HeaderElement element : header.getElements()){
                              if("ASP.NET_SessionId".equals(element.getName())){
                                  HttpUtil.setAspnet_sessionId(element.getValue());
                              }
                           }
                        }
                        // 取得返回的字符串
                        String strResult = EntityUtils.toString(httpResponse
                                .getEntity());
                        return strResult;
                    } else {
                        throw new RuntimeException("远程调用错误!");
                    }
                } catch (Exception e) {
                    return new RuntimeException(e);
                }
            
        }
        
        @Override
        protected void onPostExecute(Object result) {
            try{
            if(result instanceof RuntimeException)throw (RuntimeException)result;
            
               for(int i=101;i<105;i++){
                   new DownFileTask().execute("http://192.168.1.7:7086/down/downfile?fid=" + (i +1),"/mnt/sdcard/myd");
                }
            }catch (Exception e) {
                //Toast.makeText(DownloadDemo.this, e.getMessage(), Toast.LENGTH_LONG).show();
                new AlertDialog.Builder(DownloadDemo.this).setTitle("错误").setMessage(e.getMessage()).show();
                
            }finally
            {
                dialog.dismiss();
            }
        }
        
        
        @Override
        protected void onPreExecute() {
    
            
            dialog=ProgressDialog.show(DownloadDemo.this, null,"登陆...");
            super.onPreExecute();
        }
        
    }
    
    
    
    class DownFileTask extends AsyncTask<String, Integer, Object>{

        private ProgressDialog dialog;
        private String savePath;
        private String filename;

        private String getFilename(HttpResponse response){
            
            //有可能Disposition是开头d小写
            org.apache.http.Header header= response.getFirstHeader("Content-Disposition");
            if(header==null)return UUID.randomUUID().toString();
            
            HeaderElement[] elems= header.getElements();
            if(elems.length>0){
               NameValuePair pair=    elems[0].getParameterByName("filename");
               if(pair!=null)
                try {
                    return  URLDecoder.decode(pair.getValue(),"utf-8");
                } catch (UnsupportedEncodingException e) {
                        throw new RuntimeException(e);
                }
            }
            return null;
        }
        
        @Override
        protected Object doInBackground(String... params) {
            try {
                savePath=params[1];
                
                HttpGet request=new HttpGet(params[0]);
                request.setHeader("Cookie", "ASP.NET_SessionId=" + HttpUtil.getAspnet_sessionId());
                
                HttpClient client=HttpUtil.create();
                HttpResponse response= client.execute(request);
                
                if(response.getStatusLine().getStatusCode()!=HttpStatus.SC_OK)
                    throw new RuntimeException("下载错误,"+response.getStatusLine().getStatusCode());
                if(response.getStatusLine().getStatusCode()==HttpStatus.SC_OK){
                    
                  int fileSize=0;
                  int downSize=0;
                  
                  
                  HttpEntity httpEntity=response.getEntity();
                  fileSize=(int)httpEntity.getContentLength();
                  if(fileSize<=0) throw new RuntimeException("文件长度为零!");
                  
                  filename=getFilename(response);
                  File saveFile=new File(savePath);
                  if(!saveFile.isDirectory())saveFile.mkdirs();
                  
                  InputStream iStream=    httpEntity.getContent();
                  FileOutputStream fOut=new FileOutputStream(new File(savePath +"//" + filename));
                  try{
                   byte[] buffer=new byte[1024 * 8];
                   int readLen=-1;
                   while(  (readLen= iStream.read(buffer))!=-1 ){
                       
                       fOut.write(buffer, 0, readLen);
                       downSize +=readLen;
                       //这里添家进度完成通知
                      
                       int percent= Math.round( (downSize * 100 / fileSize));
                       publishProgress(percent);
                   }
                   fOut.flush();
                   publishProgress(100);
                  }finally{
                      iStream.close();
                      
                      fOut.close();
                  }
                   
                }
                
                
            } catch (Exception e) {
                // TODO Auto-generated catch block
                return new RuntimeException(e);
            }
            return null;
        }

        @Override
        protected void onCancelled() {
            // TODO Auto-generated method stub
            super.onCancelled();
        }

        @Override
        protected void onCancelled(Object result) {
            // TODO Auto-generated method stub
            super.onCancelled(result);
        }

        @Override
        protected void onPostExecute(Object result) {
            try{
            if(result instanceof RuntimeException)throw (RuntimeException)result;
            
            txtTips.setText("完鸟!");
            super.onPostExecute(result);
            }catch (Exception e) {
                //Toast.makeText(DownloadDemo.this, e.getMessage(), Toast.LENGTH_LONG).show();
                new AlertDialog.Builder(DownloadDemo.this).setTitle("错误").setMessage(e.getMessage()).show();
                
            }finally
            {
                dialog.dismiss();
            }
        }

        @Override
        protected void onPreExecute() {
    
            
            dialog=ProgressDialog.show(DownloadDemo.this, null,"下载中...");
            super.onPreExecute();
        }

        @Override
        protected void onProgressUpdate(Integer... values) {
            // TODO Auto-generated method stub
    
            dialog.setMessage("完成" + values[0] + "%");
            //txtTips.setText(values[0]);
            super.onProgressUpdate(values);
        }
        
    }
}

 服务端

        [HttpGet]
        public ActionResult DownFile(string fId)
        {
            if (Session["UserInfo"] == null)
            {
                throw new Exception("未登陆或登陆超过时!");
            }
            return File(Server.MapPath("/SQLite-1.0.66.0-binaries.zip"), "application/stream", Url.Encode(fId + "SQLLite类库.zip"));
        }
        public ActionResult Login(string username, string password)
        {
            Session["UserInfo"] = username;
            return Content("登陆成功!");
        }