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);

        }

        

    }

}

View Code

 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!");

        }

View Code