Test

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package edu.whu.httpclientdemo;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
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.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
    Button bt1, bt2, bt3;
    TextView tv;
    HttpClient client;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bt1 = (Button) findViewById(R.id.button1);
        bt2 = (Button) findViewById(R.id.button2);
        bt3 = (Button) findViewById(R.id.button3);
        tv = (TextView) findViewById(R.id.textView1);
        bt1.setOnClickListener(this);
        bt2.setOnClickListener(this);
        bt3.setOnClickListener(this);
        client = new DefaultHttpClient();// 创建HttpClient对象
    }
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.button1:// HttpClientGet请求网络
                new AsyncTask<String, Void, String>() {
                    @Override
                    protected String doInBackground(String... arg0) {
                        String urlString = arg0[0];
                        HttpGet get = new HttpGet(urlString);// 创建请求方法的实例
                        try {
                            HttpResponse response = client.execute(get);//获取连接响应信息
                            // 可以调用HttpResponse的getAllHeaders()、getHeaders(String name)等方法可获取服务器的响应头
                            HttpEntity httpEntity = response.getEntity();// 获取HttpEntity实体
                            // HttpEntity可以是流也可以是字符串，封装了一些对字符和流的操作，还有另外几种Entity实体类
                            // String value = EntityUtils.toString( httpEntity
                            // );//不加utf-8出现中文乱码
                            String value = EntityUtils.toString(httpEntity, "utf-8");
                            return value;
                        } catch (ClientProtocolException e) {
                            e.printStackTrace();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                        return null;
                    }
                    @Override
                    protected void onPostExecute(String result) {
                        tv.setText(result);
                    }
                }.execute("http://www.whu.edu.cn/index.htm");
                break;
            case R.id.button2:// HttpClientPost请求网络
                new AsyncTask<String, Void, String>() {
                    @Override
                    protected String doInBackground(String... arg0) {
                        HttpPost post = new HttpPost(arg0[0]);// 创建请求方法的实例
                        try {
                            List<BasicNameValuePair> list = new ArrayList<BasicNameValuePair>();
                            list.add(new BasicNameValuePair("name", "whu"));
                            post.setEntity(new UrlEncodedFormEntity(list));// 设置请求参数
                        } catch (UnsupportedEncodingException e1) {
                        }
                        try {
                            HttpResponse response = client.execute(post);// 发送请求获取相应
                            HttpEntity httpEntity = response.getEntity();// 获取HttpEntity实体
                            // HttpEntity可以是流也可以是字符串，封装了一些对字符和流的操作，还有另外几种Entity实体类
                            // String value = EntityUtils.toString( httpEntity
                            // );//不加utf-8出现中文乱码
                            String value = EntityUtils.toString(httpEntity, "utf-8");
                            return value;
                        } catch (ClientProtocolException e) {
                            e.printStackTrace();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                        return null;
                    }
                    @Override
                    protected void onPostExecute(String result) {
                        tv.setText(result);
                    }
                }.execute("http://www.whu.edu.cn/index.htm");
                break;
            case R.id.button3:// 获取图片
                new AsyncTask<String, Void, Bitmap>() {
                    @Override
                    protected Bitmap doInBackground(String... params) {
                        try {
                            URL url = new URL(params[0]);
                            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                            conn.setRequestMethod("GET");
                            //setConnectTimeout：设置连接主机超时（单位：毫秒）
                            //setReadTimeout：设置从主机读取数据超时（单位：毫秒）
                            conn.setReadTimeout(5 * 1000);//设置从主机读取超时时间为5秒
                            int code = conn.getResponseCode();//获取请求码，不设置setReadTimeout可能阻塞线程
                            if (code == 200) {//正常返回
                                InputStream inputStream = conn.getInputStream();//获取字节流
                                Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
                                return bitmap;
                            }
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                        return null;
                    }
                    @Override
                    protected void onPostExecute(Bitmap result) {
                        if (result != null) {
                            tv.setBackground(new BitmapDrawable(result));
                        }
                    }
                }.execute("http://www.whu.edu.cn/images/2017021002.jpg");
                break;
            default:
                break;
        }
    }
}
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