Android Studio中http请求方式

其他 2018-06-02 05:07:07 阅读次数: 0

//Mainactivity

package animtest.com.example.e531.week1_09month;


 import android.os.AsyncTask;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.View;
 import android.widget.Button;
 import android.widget.ListView;
 import android.widget.ProgressBar;


 import com.google.gson.Gson;


 import org.apache.http.HttpEntity;
 import org.apache.http.HttpResponse;
 import org.apache.http.client.HttpClient;
 import org.apache.http.client.methods.HttpGet;
 import org.apache.http.conn.ssl.AllowAllHostnameVerifier;
 import org.apache.http.conn.ssl.SSLSocketFactory;
 import org.apache.http.impl.client.DefaultHttpClient;
 import org.apache.http.util.EntityUtils;
 import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;


 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.net.HttpURLConnection;
 import java.net.URL;
 import java.util.ArrayList;
 import java.util.List;


 public class MainActivity extends AppCompatActivity {


     private ListView listView;
     private ProgressBar progressBar;


     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);


         Button btnClient = (Button) findViewById(R.id.btn_client);
         Button btnUrl = (Button) findViewById(R.id.btn_url);
         listView = (ListView) findViewById(R.id.lv);
         progressBar=(ProgressBar) findViewById(R.id.progressBar);


         //初使化为 看不见的状态
         progressBar.setVisibility(View.INVISIBLE);


         btnClient.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 //执行异步任务
                 MyTask myTask = new MyTask();
                 myTask.execute(new String[]{"https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10", "1"});




             }
         });


         btnUrl.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
                 //执行异步任务
                 MyTask myTask = new MyTask();
                 myTask.execute(new String[]{"https://api.tianapi.com/wxnew/?key=8d6e3228d25298f13af4fc40ce6c9679&num=10", "2"});
             }
         });




     }


     class MyTask extends AsyncTask<String, Void, String> {


         @Override
         protected String doInBackground(String... params) {
             String resultStr = "";


             //得到请求的类型
             String type = params[1];
             if ("1".equals(type)) {//如果是"1" 执行 HttpGet请求
                 //因为请求的是https协议的网址，eclipse下使用HttpGet请求会报错，需要添加以下这行代码
                 SSLSocketFactory.getSocketFactory().setHostnameVerifier(new AllowAllHostnameVerifier());
                 //1.创建一个HttpClient对象
                 HttpClient hc = new DefaultHttpClient();
                 //2.创建httpGet对象
                 HttpGet hg = new HttpGet(params[0]);


                 try {
                     //3.执行请求
                     HttpResponse response = hc.execute(hg);


                     //4.判断结果码
                     int code = response.getStatusLine().getStatusCode();
                     if (code == 200) {
                         //5.得到请求的结果
                         HttpEntity result = response.getEntity();


                         resultStr = EntityUtils.toString(result);
                     }


                 } catch (IOException e) {
                     e.printStackTrace();
                 }


             } else if ("2".equals(type)) {//如果是2执行 HttpUrlConnection请求


                 try {
                     //1.创建Url对象
                     URL url = new URL(params[0]);
                     //2.打开连接
                     HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                     //3.设置
                     connection.setRequestMethod("GET");
                     connection.setConnectTimeout(5000);
                     connection.setReadTimeout(5000);


                     //4.得到响应码，进行判断
                     int code = connection.getResponseCode();
                     if (code == 200) {
                         //5.得到结果
                         InputStream inputStream = connection.getInputStream();
                         resultStr =streamToString(inputStream);




                     }




                 } catch (Exception ex) {
                     ex.printStackTrace();
                 }


             } else {


             }




             return resultStr;
         }


         @Override
         protected void onPostExecute(String s) {
             super.onPostExecute(s);


             Log.d("zzz", s);
             //进行解析，并显示到listView上
 //            Gson gson=new Gson();
 //            ResultBean resultBean=gson.fromJson(s,ResultBean.class);


             List<News> newsList=new ArrayList<News>();
             try {
                 JSONObject obj=new JSONObject(s);
                 JSONArray array=obj.optJSONArray("newslist");
                 for(int i=0;i<array.length();i++){
                     JSONObject news=array.optJSONObject(i);
                     News ns=new News();
                     ns.setCtime(news.optString("ctime"));
                     ns.setDescription(news.optString("description"));
                     ns.setPicUrl(news.optString("picUrl"));
                     ns.setTitle(news.optString("title"));
                     ns.setUrl(news.optString("url"));
                     newsList.add(ns);
                 }


             } catch (JSONException e) {
                 e.printStackTrace();
             }




             //设置listview的适配器
             MyLvAdapter adapter=new MyLvAdapter(newsList,MainActivity.this);
             listView.setAdapter(adapter);


             //请求完成时，进度条控件为不可见状态
             progressBar.setVisibility(View.INVISIBLE);
             //请求完成时，设置listview为可见状态
             listView.setVisibility(View.VISIBLE);




         }


         @Override
         protected void onPreExecute() {
             super.onPreExecute();
             //设置进度条为显示的状态
             progressBar.setVisibility(View.VISIBLE);
             //设置listview为不可见状态
             listView.setVisibility(View.INVISIBLE);


         }
     }


     /**
      * 将流转换成字符串
      * @param stream
      * @return
      */
     public String streamToString(InputStream stream) {
         StringBuilder builder = new StringBuilder();
         try {
             BufferedReader br = new BufferedReader(new InputStreamReader(stream, "utf-8"));
             String con;
             while ((con = br.readLine()) != null) {
                 builder.append(con);
             }




         } catch (Exception ex) {
             ex.printStackTrace();
         }


         return builder.toString();
     }

}




//适配器类

package animtest.com.example.e531.week1_09month;


 import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.os.AsyncTask;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
 import android.widget.ImageView;
 import android.widget.TextView;


 import java.io.IOException;
 import java.io.InputStream;
 import java.net.HttpURLConnection;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.util.List;


 /**
  * Created by e531 on 2017/10/8.
  */
 public class MyLvAdapter extends BaseAdapter {


     private List<News>  newsList;
     private Context context;


     public MyLvAdapter(List<News> newsList, Context context) {
         this.newsList = newsList;
         this.context = context;
     }


     public int getCount() {
         return newsList.size();
     }


     @Override
     public Object getItem(int position) {
         return newsList.get(position);
     }


     @Override
     public long getItemId(int position) {
         return position;
     }


     @Override
     public View getView(int position, View convertView, ViewGroup parent) {
         ViewHolder holder;
         if(convertView==null){
             convertView=View.inflate(context,R.layout.item,null);
             holder=new ViewHolder();
             holder.tvDate= (TextView) convertView.findViewById(R.id.tv_date);
             holder.tvTitle= (TextView) convertView.findViewById(R.id.tv_title);
             holder.img= (ImageView) convertView.findViewById(R.id.img);


             convertView.setTag(holder);


         }else{
             holder=(ViewHolder) convertView.getTag();
         }


         holder.tvDate.setText(newsList.get(position).getCtime());
         holder.tvTitle.setText(newsList.get(position).getTitle());


         //图片使用异步加载
         MyPicTask myPicTask=new MyPicTask(holder.img);
         myPicTask.execute(newsList.get(position).getPicUrl());




         return convertView;
     }


     static  class ViewHolder{
         ImageView img;
         TextView tvTitle;
         TextView tvDate;
     }


     /**
      * 使用异步任务请求图片
      */
     class MyPicTask extends AsyncTask<String,Void,Bitmap>{
         private ImageView imageView;


         public  MyPicTask(ImageView imageView){
             this.imageView=imageView;
         }








         @Override
         protected Bitmap doInBackground(String... params) {
             Bitmap bitmap=null;
             try {
                 //1.创建url对象
                 URL url=new URL(params[0]);
                 //2.打开连接
                 HttpURLConnection connection= (HttpURLConnection) url.openConnection();
                 //3.设置
                 connection.setRequestMethod("GET");
                 connection.setConnectTimeout(5000);
                 connection.setConnectTimeout(5000);
                 //4.得到结果码，并且判断
                 int code=connection.getResponseCode();
                 if(code==200){
                     //5.得到结果
                     InputStream inputStream=connection.getInputStream();
                     //将流转换成Bitmap对象
                     bitmap=BitmapFactory.decodeStream(inputStream);


                 }
             } catch (MalformedURLException e) {
                 e.printStackTrace();
             } catch (IOException e) {
                 e.printStackTrace();
             }




             return bitmap;
         }


         @Override
         protected void onPostExecute(Bitmap bitmap) {
             super.onPostExecute(bitmap);


             //显示图片
             imageView.setImageBitmap(bitmap);




         }
     }

//Bean类

package animtest.com.example.e531.week1_09month;


 import java.util.List;


 /**
  * Created by e531 on 2017/10/8.
  */
 public class ResultBean {
     private String code;
     private String msg;
     private List<News> newslist;


     @Override
     public String toString() {
         return "ResultBean{" +
                 "code='" + code + '\'' +
                 ", msg='" + msg + '\'' +
                 ", newslist=" + newslist +
                 '}';
     }


     public String getMsg() {
         return msg;
     }


     public void setMsg(String msg) {
         this.msg = msg;
     }




     public List<News> getNewslist() {
         return newslist;
     }


     public void setNewslist(List<News> newslist) {
         this.newslist = newslist;
     }


     public String getCode() {
         return code;
     }


     public void setCode(String code) {
         this.code = code;
     }
 }

//Bean类

package animtest.com.example.e531.week1_09month;


 /**
  * Created by e531 on 2017/10/8.
  */
 public class News {
     private String ctime;
     private String description;
     private String picUrl;
     private String title;
     private String url;


     @Override
     public String toString() {
         return "New{" +
                 "ctime='" + ctime + '\'' +
                 ", description='" + description + '\'' +
                 ", picUrl='" + picUrl + '\'' +
                 ", title='" + title + '\'' +
                 ", url='" + url + '\'' +
                 '}';
     }


     public String getCtime() {
         return ctime;
     }


     public void setCtime(String ctime) {
         this.ctime = ctime;
     }


     public String getDescription() {
         return description;
     }


     public void setDescription(String description) {
         this.description = description;
     }


     public String getPicUrl() {
         return picUrl;
     }


     public void setPicUrl(String picUrl) {
         this.picUrl = picUrl;
     }


     public String getTitle() {
         return title;
     }


     public void setTitle(String title) {
         this.title = title;
     }


     public String getUrl() {
         return url;
     }


     public void setUrl(String url) {
         this.url = url;
     }
 }

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