andriod开发–使用Http的Get和Post方式与网络交互通信

 package com.example.a350773523.myapplication; import android.os.AsyncTask;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.text.TextUtils;
 import android.view.View;
 import android.widget.Button;
 import android.widget.EditText;
 import android.widget.Toast; import java.io.BufferedReader;
 import java.io.BufferedWriter;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.OutputStream;
 import java.io.OutputStreamWriter;
 import java.net.HttpURLConnection;
 import java.net.MalformedURLException;
 import java.net.URL;
 import java.net.URLConnection; public class MainActivity extends AppCompatActivity {     private Button btnLogin;
     private EditText etLoginID;
     private String address = "http://10.12.75.3:8080/testServer/api.jsp";
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         etLoginID = (EditText) findViewById(R.id.etLoginID);         //get方式进行联网交流
         /*
         findViewById(R.id.btnLogin).setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 if(TextUtils.isEmpty(etLoginID.getText().toString())){
                     Toast.makeText(MainActivity.this,"账号不能为空",Toast.LENGTH_LONG).show();
                 }
                 String LoginID;
                 LoginID = etLoginID.getText().toString();
                 new AsyncTask<String,Void,Void>(){
                     @Override
                     protected Void doInBackground(String... strings) {
                         try {
                             URL url =new URL(strings[0]);
                             URLConnection connection = url.openConnection();
                             InputStream is = connection.getInputStream();
                             InputStreamReader isr = new InputStreamReader(is,"utf-8");
                             BufferedReader br = new BufferedReader(isr);
                             String line ;
                             while((line=br.readLine())!=null){
                                 System.out.println(line);
                             }
                             br.close();
                             isr.close();
                             is.close();
                         } catch (MalformedURLException e) {
                             e.printStackTrace();
                         } catch (IOException e) {
                             e.printStackTrace();
                         }
                         return null;
                     }
                 }.execute(address+("?loginID=")+LoginID);
             }
         });
         */         //POST方法
         /*
         findViewById(R.id.btnLogin).setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View view) {
                 if(TextUtils.isEmpty(etLoginID.getText().toString())){
                     Toast.makeText(MainActivity.this,"账号不能为空",Toast.LENGTH_LONG).show();
                 }
                 final String LoginID;
                 LoginID = etLoginID.getText().toString();
                 new AsyncTask<String,Void,Void>(){    //异步任务防止阻塞主线程
                     @Override
                     protected Void doInBackground(String... strings) {
                         try {
                             URL url =new URL(strings[0]);
                             HttpURLConnection connection = (HttpURLConnection) url.openConnection();                             connection.setDoOutput(true);
                             connection.setRequestMethod("POST");                             //上传信息
                             OutputStreamWriter osw = new OutputStreamWriter(connection.getOutputStream(),"utf-8");
                             BufferedWriter bw =new BufferedWriter(osw);
                             bw.write(String.format("%s%s", "loginID=", LoginID));
                             bw.flush();                             //接受信息
                             InputStream is = connection.getInputStream();
                             InputStreamReader isr = new InputStreamReader(is,"utf-8");
                             BufferedReader br = new BufferedReader(isr);
                             String line ;
                             while((line=br.readLine())!=null){
                                 System.out.println(line);
                             }
                             br.close();
                             isr.close();
                             is.close();
                         } catch (MalformedURLException e) {
                             e.printStackTrace();
                         } catch (IOException e) {
                             e.printStackTrace();
                         }
                         return null;
                     }
                 }.execute(address);
             }
         });
         */
     }
 }

xml布局代码

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:gravity="center_horizontal"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical"
     tools:context="com.example.a350773523.myapplication.MainActivity">     <LinearLayout
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:orientation="horizontal">         <TextView
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="LoginID" />         <EditText
             android:id="@+id/etLoginID"
             android:layout_width="200dp"
             android:layout_height="wrap_content" />
     </LinearLayout>     <Button
         android:id="@+id/btnLogin"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="login" /> </LinearLayout>