HttpUrlConnection Get请求网络数据

注：

1.请求数据是耗时操作，需要创建一个子线程进行网络请求

2.因为是联网操作，需要添加权限：

3.需要用到的网站：www.juhe.cn

4.按步骤进行。

public class MainActivity extends Activity {

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

Button btnSearch=(Button)findViewById(R.id.button1);
btnSearch.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
new MyThread().start();

}
});
}

class MyThread extends Thread{
@Override
public void run() {
//进行http协议编程，访问网络数据
requestDataByGet();
}

}

private void requestDataByGet() {
String path="http://v.juhe.cn/postcode/query?postcode=075600&key=6e5e1292af5ebfd8eff8f2392187f5bd";

try {
//1.创建URL对象
URL url=new URL(path);

//2.打开连接，获得HttpURLConnction对象
HttpURLConnection conn=(HttpURLConnection)url.openConnection();

conn.setRequestMethod("GET");//设置请求方法-默认是get请求
conn.setConnectTimeout(5000);//设置连接超时时间

//3.获取响应码
int code=conn.getResponseCode();
if(code==200){

//4.得到输入流
InputStream stream=conn.getInputStream();

//将字节流转换成字符流
BufferedReader reader=new BufferedReader(new InputStreamReader(stream));

String content=null;
StringBuilder sb=new StringBuilder();

while((content=reader.readLine())!=null){
sb.append(content);
}

Log.d("zzz", sb.toString());

}else{
Toast.makeText(this, "请求失败！"+code, 1).show();
}

} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

}

}