HttpURLConnection对象相关方法操作_urlconnection对象有什么方法-优快云博客

本文链接：https://blog.youkuaiyun.com/xuandroid/article/details/50676457

本文通过两个具体示例介绍了如何使用Java发起HTTP GET和POST请求。GET请求用于获取验证码图片，而POST请求用于注册用户，其中包含了设置请求头、发送参数、处理响应等关键步骤。

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get访问方式。

public void getCode2(View v){

       //       step1. 起线程
       new Thread(){
           public void run() {
               try {
                   //step2. 创建能够进行网络访问的对象(HttpClient对象/HttpURLConnection对象)
                   URL url = new URL("http://IP:8080/ems/getCode.do");
                   HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                   //step3. 设定网络访问的方式(GET/POST)
                   connection.setRequestMethod("GET");
                   connection.setDoInput(true);
                   //step4. 设定参数
                   //step5. 发起真正的请求，获得响应
                   connection.connect();
                   String value = connection.getHeaderField("Set-Cookie");
                   ID2=value.split(";")[0];
                   InputStream is = connection.getInputStream();
                   //step6. 解析响应内容
                   Bitmap bitmap = BitmapFactory.decodeStream(is);
                   is.close();
                   //step7. 将内容提交到主线程中显示
                   Message.obtain(handler, 101, bitmap).sendToTarget();
               } catch (MalformedURLException e) {
                   e.printStackTrace();
               } catch (IOException e) {
                   e.printStackTrace();
               }
           };
       }.start();

}

注册时post访问方法，带参数

public void regist2(View v){
       //step1. 起线程
       new Thread(){
           public void run() {
               try {
                   //step2. 创建能够进行网络访问的对象(HttpClient对象/HttpURLConnection对象)
                   URL url = new URL("http://IP:8080/ems/regist.do");
                   HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                   //step3. 设定网络访问的方式(GET/POST)
                   connection.setRequestMethod("POST");
                   connection.setDoInput(true);
                   connection.setDoOutput(true);
                   connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
                   //step4. 设定参数
                   connection.connect();
                   OutputStream out = connection.getOutputStream();
                   PrintWriter pw = new PrintWriter(out);
                   String params="";
                   HashMap<String, String> map = new HashMap<String, String>();
                   map.put("loginname", "laozhang");
                   map.put("password", "654321");
                   map.put("realname", "zhang");
                   map.put("email", "zhang@bbc.com");
                   params = getParams(map);
                   pw.print(params);
                   pw.flush();
                   pw.close();
                   //step5. 发起真正的请求，获得响应
                   InputStream in = connection.getInputStream();
                   BufferedReader br = new BufferedReader(
                           new InputStreamReader(in));
                   //step6. 解析响应内容
                   String result = br.readLine();
                   br.close();
                   //step7. 将内容提交到主线程中显示
                   Message.obtain(handler, 102, result).sendToTarget();
               } catch (MalformedURLException e) {
                   e.printStackTrace();
               } catch (IOException e) {
                   e.printStackTrace();
               }
           };
       }.start();
   }