android 访问rest api的封装方法

android 访问rest api的封装方法
调用方法：

@Override
    public void onClick(View v) {
          if(v.getId()==R.id.btn_login)
          {
              //get 调用方法
              String get_rest_api_url="http://121.42.242.230:9999/api/user/getUserByID/1";
              webTool.get(get_rest_api_url, new CallbackData<ResultData>(){
                  @Override
                  public void call(ResultData r) {
                       System.out.println(r.isOK);
                       if(r.data!=null) {
                           JSONObject jObj=(JSONObject)r.data;
                           System.out.println("userId="+webTool.getValue(jObj,"userId"));
                           System.out.println("userName="+webTool.getValue(jObj,"userName"));
                           System.out.println(r.data.toString());
                       }
                  }
              } );

              //post 调用方法
              String post_rest_api_url="http://121.42.242.230:9999/api/user/login";
              Map<String, Object> paramterMap = new HashMap<>();
              paramterMap.put("username","admin");
              paramterMap.put("password","admin");
              paramterMap.put("rememberMe",true);
              webTool.post(post_rest_api_url,paramterMap, new CallbackData<ResultData>(){
                  @Override
                  public void call(ResultData r) {
                      System.out.println(r.isOK);
                      if(r.data!=null) {
                          JSONObject jObj=(JSONObject)r.data;
                          System.out.println("post userId="+webTool.getValue(jObj,"userId"));
                          System.out.println("post userName="+webTool.getValue(jObj,"userName"));
                          System.out.println(r.data.toString());
                      }
                  }
              } );
              //dbHelper dbHelper=new dbHelper(this,"cwgis.db");
              //String sql="create table user(id varchar(40),name text,pwd text)";
              //dbHelper.execSQL(sql);
              //跳转到webView页面
              Intent web_intent=new Intent(MainActivity.this,activity_web.class);
              startActivity(web_intent);
              MainActivity.this.finish();

              //跳转到Help页面
              /*
              Intent help_intent = new Intent(MainActivity.this, HelpActivity.class);
              startActivity(help_intent);
              MainActivity.this.finish();
               */
          }
    }

webtool工具定义：

package com.cwgis.demo.common;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.cwgis.demo.objects.CallbackData;
import com.cwgis.demo.objects.ResultData;

import org.jetbrains.annotations.NotNull;


import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.Map;
import java.util.concurrent.TimeUnit;


import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.FormBody;
import okhttp3.Headers;
import okhttp3.MediaType;
import okhttp3.MultipartBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;

public class webTool {
    private static OkHttpClient client=null;
    static{
        client = new OkHttpClient.Builder()
                .connectTimeout(500, TimeUnit.SECONDS)
                .writeTimeout(500, TimeUnit.SECONDS)
                .readTimeout(500, TimeUnit.SECONDS)
                .build();
    }
    public static boolean isNetworkConnected(Context context) {
        if (context != null) {
            ConnectivityManager manager = (ConnectivityManager) context
                    .getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo mNetworkInfo = manager.getActiveNetworkInfo();
            if (mNetworkInfo != null) {
                return mNetworkInfo.isAvailable();
            }
        }
        return false;
    }
    //同步get test
    public void test_get_tb() throws Exception{
        Request r=new Request.Builder()
                .url("http://publicobject.com/helloworld.txt")
                .build();
        Response rp=client.newCall(r).execute();
        if(rp.isSuccessful()==false) throw new IOException("unExpected code "+rp);
        Headers rpHeaders=rp.headers();
        for(int i=0;i<rpHeaders.size();i++)
        {
            System.out.println(rpHeaders.name(i)+":"+rpHeaders.value(i));
        }
        System.out.println(rp.body().string());
    }
    //异步get test
    public void test_get_await()
    {
        Request r=new Request.Builder()
                .url("http://publicobject.com/helloworld.txt")
                .build();
        client.newCall(r).enqueue(new Callback() {
            @Override
            public void onFailure(@NotNull Call call, @NotNull IOException e) {
                e.printStackTrace();
            }

            @Override
            public void onResponse(@NotNull Call call, @NotNull Response rp) throws IOException {
                if(rp.isSuccessful()==false) throw new IOException("unExpected code "+rp);
                Headers rpHeaders=rp.headers();
                for(int i=0;i<rpHeaders.size();i++)
                {
                    System.out.println(rpHeaders.name(i)+":"+rpHeaders.value(i));
                }
                System.out.println(rp.body().string());
            }
        });
    }
    //---------------------------------
    public static String toJSON(Object obj) {
        String json = JSONObject.toJSONString(obj, SerializerFeature.WriteMapNullValue);
        return json;
    }
    public static String getValue(JSONObject jObj,String key)
    {
        String rbc="";
        try {
            if (jObj != null) {
                rbc = jObj.getString(key);
            }
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
        return rbc;
    }
    public static Boolean getValueBoolean(JSONObject jObj,String key)
    {
        Boolean rbc=false;
        try {
            if (jObj != null) {
                rbc = jObj.getBoolean(key);
            }
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
        return rbc;
    }
    public static Double getValueDouble(JSONObject jObj,String key)
    {
        Double rbc=0.0;
        try {
            if (jObj != null) {
                rbc = jObj.getDouble(key);
            }
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
        return rbc;
    }
    public static double getValueDouble2(JSONObject jObj,String key)
    {
        double rbc=0.0;
        try {
            if (jObj != null) {
                rbc = jObj.getDoubleValue(key);
            }
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
        return rbc;
    }
    public static Float getValueFloat(JSONObject jObj, String key)
    {
        Float rbc=0.0f;
        try {
            if (jObj != null) {
                rbc = jObj.getFloat(key);
            }
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
        return rbc;
    }
    public static float getValueFloat2(JSONObject jObj, String key)
    {
        float rbc=0.0f;
        try {
            if (jObj != null) {
                rbc = jObj.getFloatValue(key);
            }
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
        return rbc;
    }
    public static Integer getValueInteger(JSONObject jObj,String key)
    {
        Integer rbc=0;
        try {
            if (jObj != null) {
                rbc = jObj.getInteger(key);
            }
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
        return rbc;
    }
    public static int getValueInt(JSONObject jObj,String key)
    {
        int rbc=0;
        try {
            if (jObj != null) {
                rbc = jObj.getIntValue(key);
            }
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
        return rbc;
    }
    public static Date getValueDate(JSONObject jObj, String key)
    {
        Date rbc=null;
        try {
            if (jObj != null) {
                rbc = jObj.getDate(key);
            }
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
        return rbc;
    }
    public static byte[] getValueBytes(JSONObject jObj, String key)
    {
        byte[] rbc=null;
        try {
            if (jObj != null) {
                rbc = jObj.getBytes(key);
            }
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
        return rbc;
    }

    //---------------------------------
    //下载文件保存到文件为savePath路径的地方
    public static boolean savePhoto(String savePath, Response response) {
        // savePath = AndroidTool.getMainActivity().getFilesDir()+"/123.jpg";
        InputStream is = null;
        byte[] buf = new byte[2048];
        int len = 0;
        FileOutputStream fos = null;
        try {
            // 储存下载文件的目录
            FileTool.exitsDir(FileTool.getDir(savePath), true);
            //
            is = response.body().byteStream();
            File file = new File(savePath);
            fos = new FileOutputStream(file);
            while ((len = is.read(buf)) != -1) {
                fos.write(buf, 0, len);
            }
            fos.flush();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (is != null)
                    is.close();
            } catch (IOException e) {
            }
            try {
                if (fos != null)
                    fos.close();
            } catch (IOException e) {
                return false;
            }
        }
        return true;
    }
    //---------------------------------
    //抽象get调用方法
    public static void ajax(Request request, CallbackData<ResultData> r) {

        client.newCall(request).enqueue(new Callback() {
            //请求失败
            @Override
            public void onFailure(Call call, IOException e) {
                e.printStackTrace();
                ResultData rd=new ResultData();
                rd.isOK=false;
                rd.msg=e.getMessage();
                r.call(rd);
            }

            //有响应
            @Override
            public void onResponse(Call call, Response response) throws IOException {
                ResultData rd=new ResultData();
                if (!response.isSuccessful()) {
                    //请求失败
                    rd.isOK=false;
                    rd.msg="连接服务器失败";
                    r.call(rd);
                    return;
                }
                String data = response.body().string();
                rd = JSON.parseObject(data, ResultData.class);
                rd.response=response;
                //
                r.call(rd);
            }
        });
    }

    public static void get(String rest_api_url,CallbackData<ResultData> r_callback)
    {
        Request r=new Request.Builder()
                .url(rest_api_url)
                .build();
        ajax(r, new CallbackData<ResultData>() {
            @Override
            public void call(ResultData rd) {
                  r_callback.call(rd);
                  /*
                  if(rd.isOK==true)
                  {
                      System.out.println("good");
                  }
                  else
                  {
                      System.out.println("no");
                  }*/
            }
        });
    }
    // post调用法
    public static void post(String rest_api_url, Map<String, Object> paramterMap, CallbackData<ResultData> r_callback)
    {
        FormBody.Builder bodyBuild = new FormBody.Builder();
        //formBodyBuilderAdd(formBodyBuilder);
        //Map paramterMap = new HashMap<>();
        //Map fileMap = new HashMap<>();
        //添加传入的参数
        for (String key : paramterMap.keySet()) {
            Object obj = paramterMap.get(key);
            if (obj instanceof String) {
                bodyBuild.add(key, (String) obj);
            } else {
                bodyBuild.add(key, webTool.toJSON(obj));
            }
        }
        FormBody formBody = bodyBuild.build();
        Request request = new Request
                .Builder()
                .addHeader("Content-Type", "application/json")
                .post(formBody)
                .url(rest_api_url)
                .build();
        ajax(request,new CallbackData<ResultData>() {
            @Override
            public void call(ResultData rd) {
                r_callback.call(rd);
            }
        });
    }

    public static void post_File(String rest_api_url, Map<String, Object> paramterMap, Map<String, File> fileMap, CallbackData<ResultData> r_callback)
    {
        MultipartBody.Builder bodyBuild = new MultipartBody.Builder();
        //formBodyBuilderAdd(bodyBuild);
        //添加传入的参数
        MediaType MEDIA_TYPE_MARKDOWN = MediaType.parse("text/x-markdown; charset=utf-8");
        for (String key : paramterMap.keySet()) {
            Object obj = paramterMap.get(key);
            if (obj instanceof String) {
                bodyBuild.addFormDataPart(key, (String) obj);
            } else {
                bodyBuild.addFormDataPart(key, webTool.toJSON(obj));
            }

        }
        for (String key : fileMap.keySet()) {
            File file = fileMap.get(key);
            bodyBuild.addFormDataPart("path", file.getAbsolutePath(), RequestBody.create(MEDIA_TYPE_MARKDOWN, file));
        }
        Request request = new Request.Builder()
                .url(rest_api_url)
                .post(bodyBuild.build())
                .build();
        ajax(request,new CallbackData<ResultData>() {
            @Override
            public void call(ResultData rd) {
                r_callback.call(rd);
            }
        });
    }
    //---------------------------------
}

ResultData类定义：

package com.cwgis.demo.objects;

import java.io.Serializable;

import okhttp3.Response;

public class ResultData implements Serializable {
    public boolean isOK=false;
    public Object data=null;
    public String msg="";
    public String code="";
    //
    public Response response=null;
}

CallbackData接口定义：

package com.cwgis.demo.objects;

public interface CallbackData<T> {
    void call(T t);
}

AndroidManifest.xml文件权限设置

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.cwgis.demo">
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera2.full" />
    <uses-feature android:name="android.hardware.camera" />
    <uses-feature android:name="android.hardware.camera.autofocus" />
    <application
        android:usesCleartextTraffic="true"
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".activity_web"></activity>
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".views.HelpActivity">
            <intent-filter>
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

build.gradle文件引入的第三方库：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.3"
    defaultConfig {
        applicationId "com.cwgis.demo"
        minSdkVersion 15
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility = 1.8
        targetCompatibility = 1.8
    }
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'androidx.appcompat:appcompat:1.0.2'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.13'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
    implementation 'com.google.code.gson:gson:2.8.6'
    implementation 'com.alibaba:fastjson:1.1.54.android'
    implementation 'com.squareup.okhttp3:okhttp:4.7.2'
    implementation 'com.squareup.okio:okio:1.12.0'
    implementation files('libs/ocr-sdk.jar')
    implementation files('libs/tiandituapi3.0.jar')
}

主要是下面这几个第三方库：

implementation 'com.google.code.gson:gson:2.8.6'
    implementation 'com.alibaba:fastjson:1.1.54.android'
    implementation 'com.squareup.okhttp3:okhttp:4.7.2'
    implementation 'com.squareup.okio:okio:1.12.0'

问题说明：
在添加了新权限后，要在模拟器中卸载开发的app,重新安装后权限才有效。

----the----end------