post--okhttp登录

activity_main

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="用户名"
            android:textSize="17sp" />

        <EditText
            android:id="@+id/ed_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ems="10" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="密     码"
            android:textSize="17sp" />

        <EditText
            android:id="@+id/ed_pwd"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:ems="10" />
    </LinearLayout>

    <Button
        android:id="@+id/login"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="登录"
        android:textSize="17sp"
        android:layout_gravity="center"
        android:onClick="login"/>
    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>

MainActivity

package wanghuiqi.bawie.com.post_okhttp_login;

import android.annotation.SuppressLint;
import android.os.Handler;
import android.os.Message;
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.TextView;
import android.widget.Toast;

import java.io.IOException;
import java.util.concurrent.TimeUnit;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.FormBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class MainActivity extends AppCompatActivity {

    private EditText edName;
    private EditText edPwd;
    private String path = "http://169.254.53.96:8080/web/LoginServlet";
    private TextView text;

    private static final int SUCCESS = 665;
    private static final int FALL = 894;
    @SuppressLint("HandlerLeak")
    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case SUCCESS:
                    String success_text = (String) msg.obj;
                    text.setText(success_text);
                    break;
                case FALL:
                    Toast.makeText(MainActivity.this, "没有网啊！亲", Toast.LENGTH_SHORT).show();
                    break;
            }
        }
    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //初始化控件
        initView();
    }

    private void initView() {
        edName = findViewById(R.id.ed_name);
        edPwd = findViewById(R.id.ed_pwd);
        text = findViewById(R.id.text);
    }

    public void login(View view) {
        //获取输入框的内容
        String qq = edName.getText().toString().trim();
        String pwd = edPwd.getText().toString().trim();
        if (TextUtils.isEmpty(qq) || TextUtils.isEmpty(pwd)) {
            Toast.makeText(this, "输入不能为空", Toast.LENGTH_SHORT).show();
            return;
        }
        //创建OKHttpClient
        OkHttpClient okHttpClient = new OkHttpClient.Builder()
                .connectTimeout(10, TimeUnit.SECONDS)
                .readTimeout(10, TimeUnit.SECONDS)
                .writeTimeout(10, TimeUnit.SECONDS)
                .build();
        FormBody formBody = new FormBody.Builder()
                .add("qq", qq).add("pwd", pwd)
                .build();
        Request request = new Request.Builder()
                .post(formBody)
                .url(path)
                .build();
        //创建call
        Call call = okHttpClient.newCall(request);
        //异步
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                //失败时
                handler.sendEmptyMessage(FALL);
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                //成功时
                String string = response.body().string();
                Message msg = Message.obtain();
                msg.obj = string;
                msg.what = SUCCESS;
                handler.sendMessage(msg);
            }
        });
    }
}