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>