HttpUrlConnection获取服务器数据，并返回数据

public class MainActivity extends AppCompatActivity {
private Button button;
public Handler handlerJson = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
switch (msg.what) {
case 0:
break;
case 1:
break;
}
}
};

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

/**
* @function http请求
*/
private void httpPost() {
final StringBuffer responseResult = new StringBuffer();
new Thread() {
@Override
public void run() {
super.run();
JSONObject ob = new JSONObject();
try {
ob.put("nickName", "123456789");
ob.put("passWord", "123456789");
} catch (JSONException e) {
e.printStackTrace();
}
URL url = null;
try {
url = new URL("http://172.18.74.9:8088/hello");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-type", "application/json;charset=UTF-8");
connection.setRequestProperty("accept", "*/*");
connection.setRequestProperty("connection", "Keep-Alive");
/**发送POST请求必须设置如下两行*/
connection.setDoInput(true);
connection.setDoOutput(true);
//设置连接时间为10秒
connection.setConnectTimeout(10000);
connection.connect();
/**获取URLConnection对象对应的输出流*/
PrintWriter mprintwriter = new PrintWriter(connection.getOutputStream());
mprintwriter.write(ob.toString());
mprintwriter.flush();
int responseCode = connection.getResponseCode();
if (responseCode != 200) {
Log.e("tag", "连接错误:错误码为:" + responseCode);
Message msg = Message.obtain();
msg.what = 0;
msg.obj = responseCode;
handlerJson.sendMessage(msg);
} else {
BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String line;
while ((line = reader.readLine()) != null) {
responseResult.append("\n").append(line);
}
Message msg = Message.obtain();
msg.what = 1;
msg.obj = responseResult.toString();
Log.e("tag", "http返回数据为:" + responseResult.toString());
handlerJson.sendMessage(msg);
Log.e("tag", "连接成功");
}
} catch (Exception e) {
e.printStackTrace();
}
}
}.start();
}
}