前言：下面使用HttpURLConnection进行POST的请求，GET请求不需要传递参数自然你也就会使用了。
一、创建UrlConnManager类，提供getHttpURLConnection()方法，配置默认参数，并返回HttpURLConnection的实例。
之后再写一个postParams方法，组织一下请求参数 并将请求参数写入输出流。
代码如下：
public class UrlConnManager { //配置默认参数，返回HttpURLConnection的实例 public static HttpURLConnection getHttpURLConnection(String url) { HttpURLConnection httpURLConnection = null; try { URL mUrl = new URL(url); httpURLConnection = (HttpURLConnection) mUrl.openConnection(); //设置连接超时时间 httpURLConnection.setConnectTimeout(15000); //设置读取超时时间 //开始读取服务器端数据，到了指定时间还没有读到数据，则报超时异常 httpURLConnection.setReadTimeout(15000); //设置请求参数 httpURLConnection.setRequestMethod("POST"); //添加Header httpURLConnection.setRequestProperty("Connection", "Keep-Alive"); //接收输入流 httpURLConnection.setDoInput(true); //传递参数时，需要开启 httpURLConnection.setDoOutput(true); } catch (Exception e) { e.printStackTrace(); } return httpURLConnection; } //将请求参数写入到输出流，写出到服务器 public static void postParams(OutputStream output, List<NameValuePair> paramsList) { BufferedWriter bufferedWriter = null; try { StringBuilder stringBuilder = new StringBuilder(); for (NameValuePair pair : paramsList) { if (!TextUtils.isEmpty(stringBuilder)) { stringBuilder.append("&"); } stringBuilder.append(URLEncoder.encode(pair.getName(), "UTF-8")); stringBuilder.append("="); stringBuilder.append(URLEncoder.encode(pair.getValue(), "UTF-8")); bufferedWriter = new BufferedWriter(new OutputStreamWriter(output, "UTF-8")); bufferedWriter.write(stringBuilder.toString()); } } catch (IOException e) { e.printStackTrace(); } finally { try { if (bufferedWriter != null) { bufferedWriter.close(); } } catch (IOException e) { e.printStackTrace(); } } } }
二、接下来创建一个Activity和对应的xml文件，点击按钮进行网络请求。
1、activity_http_u_r_l_connection.xml 代码如下：
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".activity.HttpURLConnectionActivity"> <Button android:id="@+id/btn_post" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="HttpURLConnection的Post请求" /> <TextView android:id="@+id/textView" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout>
2.HttpURLConnectionActivity代码如下：
public class HttpURLConnectionActivity extends AppCompatActivity { private Button btn_post; private TextView textView; //响应状态码 private int responseCode; //请求结果 private String response; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_http_u_r_l_connection); btn_post = findViewById(R.id.btn_post); textView = findViewById(R.id.textView); btn_post.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { new Thread(new Runnable() { @Override public void run() { //使用HttpURLConnection的post请求 useHttpUrlConnectionPost("https://ip.taobao.com/service/getIpInfo.php"); } }).start(); } }); } private void useHttpUrlConnectionPost(String url) { InputStream inputStream = null; //获取HttpURLConnection的实例 HttpURLConnection httpURLConnection = UrlConnManager.getHttpURLConnection(url); try { List<NameValuePair> postParams = new ArrayList<>(); //添加请求参数 postParams.add(new NameValuePair("ip", "59.108.54.37")); UrlConnManager.postParams(httpURLConnection.getOutputStream(), postParams); //建立实际的连接 httpURLConnection.connect(); inputStream = httpURLConnection.getInputStream(); //服务器返回的响应状态码 responseCode = httpURLConnection.getResponseCode(); response = convertStreamToString(inputStream); //状态码200：表示客户端请求成功 if (responseCode == HttpURLConnection.HTTP_OK) { //在子线程中不能操作UI线程，通过handler在UI线程中进行操作 handler.sendEmptyMessage(0x00); } } catch (IOException e) { e.printStackTrace(); } finally { try { if (inputStream != null) { inputStream.close(); } } catch (IOException e) { e.printStackTrace(); } } } Handler handler = new Handler(new Handler.Callback() { @Override public boolean handleMessage(@NonNull Message msg) { if (msg.what == 0x00) { textView.setText("响应状态码：" + responseCode + "\n" + "请求结果：" + "\n" + response); } return true; } }); //读取服务器返回的字符串 private String convertStreamToString(InputStream inputStream) { BufferedReader bufferedReader = null; StringBuffer stringBuffer = new StringBuffer(); String line; try { bufferedReader = new BufferedReader(new InputStreamReader(inputStream)); while ((line = bufferedReader.readLine()) != null) { stringBuffer.append(line).append("\n"); } } catch (IOException e) { e.printStackTrace(); } finally { try { if (bufferedReader != null) { bufferedReader.close(); } } catch (IOException e) { e.printStackTrace(); } } return stringBuffer.toString(); } }
具体注释已经在代码中给出，效果如下：
