初试OkHttp3实现登录功能

2017-04-12

听说OkHttp3很好用喔！

在OkHttp3之前的版本需要自己定义ResultCallback用于返回数据，而OkHttp3自带了Callback将这个简化不少，这次我就尝试用下OkHttp3来简单实现注册和登录功能

注意

因为是注册和登录的功能，我这里只用post
使用Map封装提交的Post参数
基础用法就不讲了，就直接开始实例吧

封装OkHttp工具类

post与get的差别就在于post需要上传post参数，我这里将参数封装在

```
public static void post(String address, okhttp3.Callback callback, Map<String,String> map)
    {
        OkHttpClient client = new OkHttpClient();
        FormBody.Builder builder = new  FormBody.Builder();
        if (map!=null)
        {
            for (Map.Entry<String,String> entry:map.entrySet())
            {
                builder.add(entry.getKey(),entry.getValue());
            }
        }
        FormBody body = builder.build();
        Request request = new Request.Builder()
                .url(address)
                .post(body)
                .build();
        client.newCall(request).enqueue(callback);
    }

使用

现在封装好了post方法，只要我们在需要用到的时候调用
登录时直接调用一下代码即可

OkHttpUtil.post(url, new okhttp3.Callback() {
                @Override
                public void onFailure(Call call, IOException e) {
                }
                @Override
                public void onResponse(Call call, Response response) throws IOException {
                },map};

慢着，我们这里的map呢？，
既然是登录,那就把id和密码封装到map中

1	map.put("phone",id.getText().toString()); map.put("password",password.getText().toString());

回调

由上面的代码可知，调用Post会重写onFailure和onResponse
onFailure是在调用失败时返回的，所以一般
打印错误信息

"onFailure: ",e);```

1 2	onResponse是成功时返回请求值，如JSON等所以完整的回调是这样的

@Override
public void onFailure(Call call, IOException e) {
Log.e(TAG, “onFailure: “,e);
}
@Override
public void onResponse(Call call, Response response) throws IOException {
String responseBody = response.body().string();
try {
runOnUiThread(new Runnable() {
@Override
public void run() {
if(token!=null)
{
CommonVari.token = token;
Intent intent1 = new Intent(LoginActivity.this,MainActivity.class);
startActivity(intent1);
CommonVari.FAG = 1;
finish();
}else{
new ToastUtil(LoginActivity.this,0);
}
}
});
} catch (JSONException e) {
e.printStackTrace();
}
}
},map);
}

其中ToastUtil是自定义的Toast，在登录信息错误时使用这里可以忽略，当信息没错时就可以跳转到主界面
#### 完整代码
OkHttpUtil.java

public class OkHttpUtil {
public static void post(String address, okhttp3.Callback callback, Map map)
{
OkHttpClient client = new OkHttpClient();
FormBody.Builder builder = new FormBody.Builder();
if (map!=null)
{
for (Map.Entry entry:map.entrySet())
{
builder.add(entry.getKey(),entry.getValue());
}
}
FormBody body = builder.build();
Request request = new Request.Builder()
.url(address)
.post(body)
.build();
client.newCall(request).enqueue(callback);
}
}

1	LoginActivity.java

public class LoginActivity extends AppCompatActivity implements View.OnClickListener{

String TAG = "LoginActivity";
private Button visitorBt;
private EditText id;
private EditText password;
private Button registerBt;
private Button loginBt;
private Button modifyBt;
//private Handler handler;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_login);
    id = (EditText) findViewById(R.id.login_id);
    password = (EditText) findViewById(R.id.login_password);
    loginBt = (Button) findViewById(R.id.login_bt);
    registerBt = (Button) findViewById(R.id.register);
    modifyBt = (Button) findViewById(R.id.login_modify_bt);
    visitorBt = (Button) findViewById(R.id.visitor);
    initView();

}

private void initView()
{
    //注册登录按钮
    loginBt.setOnClickListener(this);
    //注册按钮监听
    registerBt.setOnClickListener(this);
    //注册修改密码按钮
    modifyBt.setOnClickListener(this);
    //游客登录按钮
    visitorBt.setOnClickListener(this);
}

@Override
public void onClick(View v) {
    switch (v.getId()){
        case R.id.register:
            Intent intent = new Intent(LoginActivity.this,RegisterActivity.class);
            startActivity(intent);
             break;
        case R.id.login_bt:
            login();
            break;
        case R.id.login_modify_bt:
            Intent intent2 = new Intent(LoginActivity.this,ModifyPasswordActivity.class);
            startActivity(intent2);
            break;
        case R.id.visitor:
            Intent intent3 = new Intent(LoginActivity.this,MainActivity.class);
            startActivity(intent3);
            finish();
            break;
    }
}

/**
 * 处理登录事件
 */
private void login() {
    String url = Api.url+"auth/login";
    Map<String,String> map = new HashMap<>();
    if(id.getText().toString().length()!=11)
    {
        new ToastUtil(LoginActivity.this, CommonVari.IDNULL);
    }else if(password.getText().toString().length()<6){
        new ToastUtil(LoginActivity.this,CommonVari.LIT);
    }
    else{
        map.put("phone",id.getText().toString());
        map.put("password",password.getText().toString());

        OkHttpUtil.post(url, new okhttp3.Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
                Log.e(TAG, "onFailure: ",e);
            }
            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String responseBody = response.body().string();
                try {
                    final String token = JsonUtil.getToken(responseBody);
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            if(token!=null)
                            {
                                CommonVari.token = token;
                                Intent intent1 = new Intent(LoginActivity.this,MainActivity.class);
                                startActivity(intent1);
                                CommonVari.FAG = 1;
                                finish();
                            }else{
                                new ToastUtil(LoginActivity.this,0);
                            }
                        }
                    });

                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        },map);
    }
}

}
```