ADD file via upload

StudentLogin.java

@@ -0,0 +1,226 @@
+package com.example;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.app.AlertDialog;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.Looper;
+import android.os.Message;
+import android.text.TextUtils;
+import android.util.Log;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.Toast;
+
+import com.example.activity.TestSettingActivity;
+
+import java.io.IOException;
+
+import okhttp3.Call;
+import okhttp3.FormBody;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.RequestBody;
+import okhttp3.Response;
+
+public class StudentLogin extends AppCompatActivity {
+    Button login,register;
+    EditText sno,password;
+
+    public static final int MSG_LOGIN_ERR = 1; //登录错误
+    public static final int MSG_CONNET_ERR = 2; //网络链接错误
+    private Context context;
+
+    private LoginHandler login_handler;
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.login_student);
+        context = this;
+        InitView();
+        login_handler = new LoginHandler();
+        Init();
+        /*super.onCreate(savedInstanceState);
+        setContentView(R.layout.login_student);
+        login = (Button) findViewById(R.id.login_button);
+        register = (Button) findViewById(R.id.reg_button);
+        sno = (EditText) findViewById(R.id.username);
+        password = (EditText) findViewById(R.id.password);
+        login.setOnClickListener(this);
+        register.setOnClickListener(this);
+*/
+    }
+    private void InitView()
+    {
+        sno = (EditText)findViewById(R.id.username);
+        password = (EditText)findViewById(R.id.password);
+        login = (Button)findViewById(R.id.login_button);
+        register = (Button) findViewById(R.id.reg_button);
+    }
+    private void Init() {
+
+        //设置提示的颜色
+        sno.setHintTextColor(getResources().getColor(R.color.white));
+        password.setHintTextColor(getResources().getColor(R.color.white));
+
+
+        //登录
+        login.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                if (judge()) {
+                    login.setEnabled(false);//点了登录后不可以再点，避免用户乱点
+                    loginInfo();
+                }
+            }
+        });
+
+        //注册
+        register.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                Toast.makeText(context, "注册", Toast.LENGTH_SHORT).show();
+                startActivity(new Intent(StudentLogin.this, StudentRegister.class));
+            }
+        });
+
+
+    }
+    private void loginInfo() {
+        String userId = sno.getText().toString();
+        String userPassword = password.getText().toString();
+        //get 请求
+        String login_check_url = "http://169.254.115.53:8080/shixun/Login";
+        RequestBody requestBody = new FormBody.Builder()
+                .add( "username",userId)
+                .add("password",userPassword)
+                .build();
+
+        okhttp3.Callback callback = new okhttp3.Callback()
+        {
+            @Override
+            public void onResponse(Call call, Response response) throws IOException {
+                String responseData = response.body().string();
+                Log.e("LoginActivity","onResponse");
+                Log.e("LoginActivity",responseData);
+                if(responseData.equals("success")) {
+                    Looper.prepare();
+                    Toast.makeText(context, "恭喜您登录成功",Toast.LENGTH_SHORT).show();
+                    //startActivity(new Intent(StudentLogin.this, TestSettingActivity.class));
+                    //finish();
+                    Looper.loop();
+                }
+                else {
+                    Message msg = new Message();
+                    msg.what = MSG_LOGIN_ERR;
+                    login_handler.sendMessage(msg);
+                }
+            }
+            @Override
+            public void onFailure(Call call, IOException e) {
+                String responseData = "Error!";
+                Log.e("LoginActivity","Failure");
+                Log.e("LoginActivity",responseData);
+                Message msg = new Message();
+                msg.what = MSG_CONNET_ERR;
+                login_handler.sendMessage(msg);
+            }
+        };
+        OkHttpClient client = new OkHttpClient();
+
+        Request request = new Request.Builder()
+                .url(login_check_url)
+                .post(requestBody)
+                .build();
+        //发送请求
+        client.newCall(request).enqueue(callback);
+    }
+
+    //判断登录信息是否合法
+    private boolean judge() {
+        if (TextUtils.isEmpty(sno.getText().toString()) ) {
+            Toast.makeText(context, "用户名不能为空",Toast.LENGTH_SHORT).show();
+            return false;
+        } else if (TextUtils.isEmpty(password.getText().toString())) {
+            Toast.makeText(context, "密码不能为空",Toast.LENGTH_SHORT).show();
+            return false;
+        }
+        return true;
+    }
+
+    /**
+     3 * 事件捕获
+     4 */
+    class LoginHandler extends Handler {
+        @Override
+        public void dispatchMessage(Message msg) {
+            super.dispatchMessage(msg);
+            switch (msg.what) {
+                case MSG_LOGIN_ERR:
+                    sno.setText("");
+                    password.setText("");
+                    sno.requestFocus();
+                    new AlertDialog.Builder(StudentLogin.this)
+                            .setTitle("注意")
+                            .setMessage("用户名或密码输入不正确，请重新输入")
+                            .setPositiveButton("确定",null)
+                            .create()
+                            .show();
+                    login.setEnabled(true);
+                    break;
+                case MSG_CONNET_ERR:
+                    new AlertDialog.Builder(StudentLogin.this)
+                            .setTitle("注意")
+                            .setMessage("网络连接错误，请检查网络")
+                            .setPositiveButton("确定",null)
+                            .create()
+                            .show();
+                    break;
+            }
+        }
+
+    }
+/*
+    @Override
+    public void onClick(View view) {
+        switch (view.getId()){
+            case R.id.reg_button:
+                Intent intent = new Intent(StudentLogin.this,StudentRegister.class);
+                startActivity(intent);
+                break;
+            case R.id.login_button:
+                new Thread(){
+                @Override
+                public void run() {
+                    LoginDao userDao = new LoginDao();
+                    int msg = userDao.login(sno.getText().toString(),password.getText().toString());
+                    hand1.sendEmptyMessage(msg);
+                }
+            }.start();
+
+                break;
+            default:
+        }
+    }
+
+    @SuppressLint("HandlerLeak")
+    final Handler hand1 = new Handler() {
+        @Override
+        public void handleMessage(Message msg) {
+            if (msg.what == 0){
+                Toast.makeText(getApplicationContext(), "登录失败", Toast.LENGTH_LONG).show();
+            } else if (msg.what == 1) {
+                Toast.makeText(getApplicationContext(), "登录成功", Toast.LENGTH_LONG).show();
+            } else if (msg.what == 2){
+                Toast.makeText(getApplicationContext(), "密码错误", Toast.LENGTH_LONG).show();
+            } else if (msg.what == 3){
+                Toast.makeText(getApplicationContext(), "账号不存在", Toast.LENGTH_LONG).show();
+            }
+        }
+    };*/
+}