AsyncTask POST请求

布局：

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <android.support.constraint.ConstraintLayout
 3     xmlns:android="http://schemas.android.com/apk/res/android"
 4     xmlns:app="http://schemas.android.com/apk/res-auto"
 5     xmlns:tools="http://schemas.android.com/tools"
 6     android:layout_width="match_parent"
 7     android:layout_height="match_parent"
 8     tools:context="net.bwie.network.activity.PostActivity">
 9 
10     <Button
11         android:id="@+id/post_btn"
12         android:text="post请求"
13         android:layout_width="wrap_content"
14         android:layout_height="wrap_content"/>
15 
16 </android.support.constraint.ConstraintLayout>

Activity:

  1 /**
  2  * 当前案例：
  3  * 上传姓名和年龄，返回JSON字符串
  4  */
  5 public class PostActivity extends AppCompatActivity implements View.OnClickListener {
  6 
  7     protected Button mPostBtn;
  8 
  9     @Override
 10     protected void onCreate(Bundle savedInstanceState) {
 11         super.onCreate(savedInstanceState);
 12         super.setContentView(R.layout.activity_post);
 13         initView();
 14     }
 15 
 16     @Override
 17     public void onClick(View view) {
 18         if (view.getId() == R.id.post_btn) {
 19             doPost();
 20         }
 21     }
 22 
 23     // 使用异步任务执行POST请求
 24     private void doPost() {
 25         String url = "http://localhost:8080/postdemo";
 26 
 27         PostTask task = new PostTask();
 28         task.execute(url);
 29     }
 30 
 31     private void initView() {
 32         mPostBtn = (Button) findViewById(R.id.post_btn);
 33         mPostBtn.setOnClickListener(PostActivity.this);
 34     }
 35 
 36     private class PostTask extends AsyncTask<String, Void, Person> {
 37 
 38         @Override
 39         protected Person doInBackground(String... params) {
 40             String requestUrl = params[0];
 41 
 42             URL url = null;
 43             try {
 44                 url = new URL(requestUrl);
 45                 HttpURLConnection connection = (HttpURLConnection) url.openConnection();
 46                 // 设置POST请求
 47                 connection.setRequestMethod("POST");
 48                 // 设置可向服务器输出
 49                 connection.setDoOutput(true);
 50                 // 打开连接
 51                 connection.connect();
 52 
 53                 // 打开连接后，向服务端写要提交的参数
 54                 // 参数格式：“name=asdasdas&age=123123”
 55                 StringBuilder stringBuilder = new StringBuilder();
 56                 stringBuilder.append("name=")
 57                         .append("wuyanzu")// 拼接自己传入的姓名
 58                         .append("&")
 59                         .append("age=")
 60                         .append("123");// 拼接自己传入的年龄
 61                 // 获取向服务器写数据的输出流
 62                 connection.getOutputStream()
 63                         .write(stringBuilder.toString().getBytes());
 64 
 65                 // 提交数据后，获取来自服务器的json数据
 66                 if (connection.getResponseCode() == 200) {
 67                     BufferedReader br = null;
 68                     br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
 69 
 70                     String json = "";
 71                     String line = "";
 72 
 73                     while ((line = br.readLine()) != null) {
 74                         json += line.trim();
 75                     }
 76 
 77                     // 解析
 78                     Gson gson = new Gson();
 79                     Person person = gson.fromJson(json, Person.class);
 80                     return person;
 81 
 82                 }
 83 
 84             } catch (Exception e) {
 85                 e.printStackTrace();
 86             }
 87 
 88 
 89             return null;
 90         }
 91 
 92         @Override
 93         protected void onPostExecute(Person person) {
 94             super.onPostExecute(person);
 95 
 96             Log.d("1507", "name:" + person.getName() + ", age: " + person.getAge());
 97         }
 98     }
 99 
100 }

Bean:

 1 package net.bwie.network.bean;
 2 
 3 public class Person {
 4 
 5     private String name = "";
 6     private String age = "";
 7 
 8     public String getName() {
 9         return name;
10     }
11 
12     public void setName(String name) {
13         this.name = name;
14     }
15 
16     public String getAge() {
17         return age;
18     }
19 
20     public void setAge(String age) {
21         this.age = age;
22     }
23 }

权限： 1 <uses-permission android:name="android.permission.INTERNET"/>