HttpClientPost

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import com.hgz.test.httpclientpost.utils.StreamTools;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btnHttpClientPost = (Button) findViewById(R.id.btnHttpClientPost);
        btnHttpClientPost.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                getFoodData();
            }
        });
    }

    private void getFoodData() {
        new Thread() {
            @Override
            public void run() {
                super.run();
                try {

                    //1.打开浏览器

                    HttpClient httpClient = new DefaultHttpClient();
                    //2.填地址
                    HttpPost httpPost = new HttpPost("http://apis.juhe.cn/catering/query");
                    List<BasicNameValuePair> parameters = new ArrayList<BasicNameValuePair>();
                    parameters.add(new BasicNameValuePair("lng","121.538123"));
                    parameters.add(new BasicNameValuePair("lat","31.677132"));
                    parameters.add(new BasicNameValuePair("key","63cdf5da9cc1f4bfd6186ba59515ffa4"));
                    //设置请求正文
                    httpPost.setEntity(new UrlEncodedFormEntity(parameters));
                    //3.敲回车
                    HttpResponse response = httpClient.execute(httpPost);
                    //4.判断服务器是否应答了我们的请求
                    //getStatusLine() 得到状态行
                    //getStatusCode() 得到状态行里面的状态码
                    int code = response.getStatusLine().getStatusCode();
                    //HttpStatus.SC_OK 200
                    if (code == HttpStatus.SC_OK) {
                        //得到服务给我们响应的内容

                        InputStream is = response.getEntity().getContent();

                        //调用utils工具类

                        String json = StreamTools.getFood(is);
                        System.out.println(json.toString());
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }.start();

    }

}

//utils工具类

import java.io.ByteArrayOutputStream;
import java.io.InputStream;

public class StreamTools {

    public static String getFood(InputStream is){
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            byte[] buffer=new byte[1004];
            int len=0;
            while((len=is.read(buffer))!=-1){
                baos.write(buffer,0,len);
            }
            is.close();
            baos.close();
            return baos.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}