android OKHttp3的使用

android OKHttp3的使用

目录

1添加网络权限 1

2导入okhttp3架包（在build.gradel(app)） 1

3新建Net类用来放网址 1

4新建MathTools类，用来进行md5编码 1

5. 2

6. 全部代码 4

7. 在loginActivity.java添加回调函数 6

 

1添加网络权限

<uses-permission android:name="android.permission.INTERNET" />

2导入okhttp3架包（在build.gradel(app)）

//网络请求的架包 implementation 'com.squareup.okhttp3:okhttp:3.8.1'

3新建Net类用来放网址

public class Net {     public final  static String TEACHER="http://111.211.207.1107:800/hh/";//老师登录地址     public final  static String STUDENT="http://111.211.207.1107:800/hh/";//学生登录地址     public final  static String T_LOGIN=TEACHER+"Firstlogin";     public final  static String S_LOGIN=STUDENT+"Firstlogin"; }

4新建MathTools类，用来进行md5编码

package com.example.a11699.sdsyu.utils; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; public class MathTools {     public static int findMax(int[] numbers){         int max = Integer.MIN_VALUE;         if(numbers.length>=0){             for(int i=0;ilength;i++){                 if(numbers[i]>max){                     max = numbers[i];                 }             }             return max;         }else{             return 0;         }     }     public static String getMd5(String plainText) {         try {             MessageDigest md = MessageDigest.getInstance("MD5");             md.update(plainText.getBytes());             byte b[] = md.digest();             int i;             StringBuffer buf = new StringBuffer("");             for (int offset = 0; offset < b.length; offset++) {                 i = b[offset];                 if (i < 0)                     i += 256;                 if (i < 16)                     buf.append("0");                 buf.append(Integer.toHexString(i));             }             //32位加密             return buf.toString();             // 16位的加密             //return buf.toString().substring(8, 24);         } catch (NoSuchAlgorithmException e) {             e.printStackTrace();             return null;         }     } }

5.

这里假设有登录账号 name=admin 密码 password=123 //拼接网址 String url=Net.S_LOGIN+”?s_xuehao=”+name+”&password=”+password; //打印输出看下 Log.i(“zjc”,url);//  http://111.211.207.1107:800/hh/?s_xuehao=admin&password=123 OkHttpClicent okHttpClient=new OkHttpClient(); Request request=new Request.Builder().url(url).build(); Call call=okHttpClient.newCall(request); call.enqueue(new Callback(){   @Override public void onFailure(Call call, IOException e) { /* 这里请求失败的原因有两个 你的网址有错误，要么服务器没开 你访问的网址是http打头的。当你的连接是http打头的话，你要在APplicationContext.xml 添加android:usesCleartextTraffic="true" */ Log.i("zjc","网络请求失败"); } @Override public void onResponse(Call call, Response response) throws IOException {    Log.i(“zjc”,”请求成功”); //拿到返回来的json串    String responseData=response.body().string();//注意这里一定要用.string    try{   JSONbject jsonObject=new JSONObject(responseData);   Log.i(“zjc”,responseData); /*  学校端返回的数据是： // 没数据的时候{"Firstlogin":{}} // 有数据的时候： //{"Firstlogin":{"stu_id":"201604070101","token":"a3c5f24c062c4b0d24b03a3d4efe1919"}} // JSONObject jsonObject1=jsonObject.getJSONObject(“Firstlogin”); try{ String stu_id=jsonObject1.getString(“stu_id”); String password=jsonObject.getString(“token”); //在loginActivity定义了loginCallback方法 loginActivity.loginCallback(sti_id,password); }catch(Exception e){ //在loginActivity定义了loginlback方法 loginActivity.loginBack(); Log.i(“zjc”,”没有这项值”); } */ }catch(JSONException e){   Log.i(“zjc”,”失败”); } });

1. 全部代码

package com.example.a11699.sdsyu.dao.imp; import android.content.Intent; import android.content.SharedPreferences; import android.os.Handler; import android.os.Looper; import android.util.Log; import android.widget.ShareActionProvider; import android.widget.Toast; import com.example.a11699.sdsyu.MyApplication; import com.example.a11699.sdsyu.activities.LoginActivity; import com.example.a11699.sdsyu.activities.MainActivity; import com.example.a11699.sdsyu.imp.userService; import com.example.a11699.sdsyu.internet.Net; import org.json.JSONException; import org.json.JSONObject; import java.io.IOException; import okhttp3.Call; import okhttp3.Callback; import okhttp3.OkHttpClient; import okhttp3.Request; import okhttp3.Response; public class userServiceDaoImp implements userService {     private LoginActivity loginActivity;     public userServiceDaoImp(LoginActivity loginActivity) {         this.loginActivity=loginActivity;     }     @Override     public void loginValidate(final String username, final String password) {         Handler handler=new Handler();         handler.post(new Runnable() {             @Override             public void run() {                 //响应的网址                 String url= Net.S_LOGIN+"?s_xuehao="+username+"&s_pwd="+password;                 Log.i("zjc",url);                 OkHttpClient okHttpClient=new OkHttpClient();                 final Request request=new Request.Builder().url(url).build();//访问不同的url在这改                 Call call=okHttpClient.newCall(request);                 call.enqueue(new Callback() {                     @Override                     public void onFailure(Call call, IOException e) {                         Log.i("zjc","网络请求失败");                     }                     @Override                     public void onResponse(Call call, Response response) throws IOException {                         Log.i("ZJC","请求成功");                         String responseData=response.body().string();                         try {                             JSONObject jsonObject = new JSONObject(responseData);                             Log.i("zjc",responseData);                             //                             // *                             // 学校端返回的数据是：                             // 没数据的时候{"Firstlogin":{}}                             // 有数据的时候：                             //{"Firstlogin":{"stu_id":"201604070101","token":"a3c5f24c062c4b0d24b03a3d4efe1919"}}                             //                             JSONObject jsonObject1=jsonObject.getJSONObject("Firstlogin");                             try{                                 String stu_id=jsonObject1.getString("stu_id");//拿到登录着的id                                 String password=jsonObject1.getString("token");                                 loginActivity.loginCallback(stu_id,password);//判断登录情况                             }catch(Exception e){                                 loginActivity.loginBack();                                 Log.i("zjc","没这项值");                             }                     /*                    可以解析json里的值                    JSONObject jsonArray=jsonObject.getJSONObject("data");//学校端返回的数据是{"data":{}}                     String token=jsonArray.getString("loginname");                     */                         } catch (JSONException e) {                             Log.i("zjc","失败");                         }                     }                 });             }         });     } }

 

1. 在loginActivity.java添加回调函数

//成功的回调函数 public  void loginCallback(String name,String password){     editor.putString("stu_id",name);     editor.putString("token",password);     editor.commit();     Looper.prepare();     Toast.makeText(LoginActivity.this,"登录成功",Toast.LENGTH_LONG).show();     Intent intent=new Intent(LoginActivity.this,MainActivity.class);//登录成功后跳转页面     startActivity(intent);     Looper.loop(); } //失败的回调函数 public void loginBack(){     Looper.prepare();     Toast.makeText(LoginActivity.this,"用户名/密码错误",Toast.LENGTH_LONG).show();     Looper.loop(); } 重点： 注意在线程中调用Toast时要加上  Looper.prepare()  Looper.loop();