Android 网络编程

一、OkHttp的使用

依赖
implementation 'com.squareup.okhttp3:okhttp:3.10.0'
implementation 'com.squareup.okio:okio:1.11.0'
混淆配置
# okhttp3
-dontwarn okhttp3.**
-dontwarn okio.**
-dontwarn javax.annotation.**
# A resource is loaded with a relative path so the package of this class must be preserved.
-keepnames class okhttp3.internal.publicsuffix.PublicSuffixDatabase

二、Get请求方式

    //性能优化,每次网络请求都创建会造成资源浪费
    private static final OkHttpClient okHttpClient = new OkHttpClient.Builder()
            .connectTimeout(5, TimeUnit.SECONDS)
            .readTimeout(5, TimeUnit.SECONDS)
            .writeTimeout(5, TimeUnit.SECONDS)
            .retryOnConnectionFailure(false) -> 超时不需要重连
            .build();

    public static void sendOkHttpClient(String url, LinkedHashMap map, final onResultListener listener) {
        Request request = new Request.Builder()
                .url(attachHttpGetParams(url, map))
                .build();
        okHttpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
               
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                response.close(); //资源回收
            }
        });
    }

    private static String attachHttpGetParams(String url, LinkedHashMap map) {
        Iterator keys = map.keySet().iterator();
        Iterator values = map.values().iterator();
        StringBuffer stringBuffer = new StringBuffer();
        stringBuffer.append("?");

        for (int i = 0; i < map.size(); i++) {
            String value = null;
            try {
                value = URLEncoder.encode(values.next(), "utf-8");
            } catch (Exception e) {
                e.printStackTrace();
            }

            stringBuffer.append(keys.next() + "=" + value);
            if (i != map.size() - 1) {
                stringBuffer.append("&");
            }
        }
        return url + stringBuffer.toString();
    }

三、Post请求方式

提交FormBody
    public static void sendOkHttpClient(String url, Map map, final onResultListener listener) {
        FormBody.Builder builder = new FormBody.Builder();
        Iterator> iterator = map.entrySet().iterator();
        while (iterator.hasNext()) {
            Map.Entry entry = iterator.next();
            builder.add(entry.getKey(), entry.getValue());
        }
        Request request = new Request
                .Builder()
                .post(builder.build())
                .url(url)
                .build();
        okHttpClient.newCall(request).enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException { 
                response.close(); //资源回收
            }
        });
    }
提交MultipartBody
    public static void YXCreateAccount(String accid, String name, String token, String url, Callback callback) {
        String appKey = "appKey";
        String appSecret = "appSecret";
        String nonce = "12345";
        String curTime = String.valueOf((new Date()).getTime() / 1000L);
        String checkSum = CheckSumBuilder.getCheckSum(appSecret, nonce, curTime);

        MultipartBody.Builder builder = new MultipartBody.Builder();
        builder.setType(MultipartBody.FORM);
        Map map = new HashMap<>();
        map.put("accid", accid);
        map.put("name", name);
        map.put("token", token);

        //遍历map请求参数
        Iterator> iterator = map.entrySet().iterator();
        while (iterator.hasNext()) {
            Map.Entry entry = iterator.next();
            builder.addFormDataPart(entry.getKey(), entry.getValue());
        }

        final Request request = new Request.Builder()
                .addHeader("AppKey", appKey)
                .addHeader("Nonce", nonce)
                .addHeader("CurTime", curTime)
                .addHeader("CheckSum", checkSum)
                .addHeader("Content-Type",
                        "application/x-www-form-urlencoded;charset=utf-8")
                .url(url).post(builder.build()).build();

        OkHttpClient client = new OkHttpClient();
        client.newCall(request).enqueue(callback);
    }

四、Retrofit的使用

依赖(适配Rxjava和Gson)
    implementation 'com.squareup.retrofit2:retrofit:2.4.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.0.2'
    implementation 'com.squareup.retrofit2:adapter-rxjava2:2.3.0'
混淆配置
# Retain generic type information for use by reflection by converters and adapters.
-keepattributes Signature
# Retain service method parameters.
-keepclassmembernames,allowobfuscation interface * {
    @retrofit2.http.* ;
}
# Ignore annotation used for build tooling.
-dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
创建Retrofit工具类
import java.util.HashMap;
import java.util.Map;
import okhttp3.ResponseBody;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.adapter.rxjava2.RxJava2CallAdapterFactory;
import retrofit2.converter.gson.GsonConverterFactory;
import retrofit2.http.HTTP;
import retrofit2.http.Path;

public class RetrofitUtil {
    private static final String sUrl="http://192.168.43.45:8080/developer/api/";
    private static Retrofit sRetrofit = new Retrofit.Builder()
            .baseUrl(sUrl)
            .addConverterFactory(GsonConverterFactory.create())
            .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
            .build();
    private static RetrofitService sRetrofitService = sRetrofit.create(RetrofitService.class);

    public static void getInfo(int id,Callback callback){
        sRetrofitService.getId(id).enqueue(callback);
    }

    public static Retrofit getRetrofit(){
        return sRetrofit;
    }

    public static RetrofitService getRetrofitService(){
        return sRetrofitService;
    }
}
创建Retrofit动态代理对象接口
import okhttp3.ResponseBody;
import retrofit2.Call;
import retrofit2.http.Body;
import retrofit2.http.Field;
import retrofit2.http.FieldMap;
import retrofit2.http.FormUrlEncoded;
import retrofit2.http.GET;
import retrofit2.http.HTTP;
import retrofit2.http.Header;
import retrofit2.http.Headers;
import retrofit2.http.Multipart;
import retrofit2.http.POST;
import retrofit2.http.Part;
import retrofit2.http.PartMap;
import retrofit2.http.Path;
import retrofit2.http.Query;
import retrofit2.http.QueryMap;
import retrofit2.http.Url;

public interface RetrofitService {

    @GET("developers") -> 以sUrl/developers为例
    Call getId();

    @GET("{developers}") -> 以 sUrl/ "str" 为例
    Call getId(@Path("developers")String str);

    @GET("developers") -> 以sUrl/developers?id=ids为例
    Call getId(@Query("id") int id);

    @GET("developers") -> 以sUrl/developers?id=ids为例
    Call getId(@QueryMap Map map);

    @GET -> 以url=sUrl/developers||url=developers为例
    Call getId(@Url String url);

    @POST("developers") -> 以sUrl/developers?id=ids为例
    @FormUrlEncoded -> 以表单形式提交
    Call getId(@Field("id") int id);

    @POST("developers") -> 以sUrl/developers?id=ids为例
    @FormUrlEncoded -> 以表单形式提交
    Call getId(@FieldMap Map map);

    @POST("developers") -> 以sUrl/developers?id=ids为例
    @Multipart -> 以文件形式提交
    Call getId(@Part("id") int id);

    @POST("developers") -> 以sUrl/developers?id=ids为例
    @Multipart -> 以文件形式提交
    Call getId(@PartMap Map map);
    
    @POST("developes") -> 以sUrl/developers?id=ids为例
    @Header("name:wjx") -> 添加单个请求头 
    @Headers("name:wjx","pass:xjw") -> 添加多个请求头
    Call getId(@Body User user); -> 添加请求体

    @HTTP(method="GET",path="developers",hasBody=false) ->方法类型要全大写
    Call getId();
}
使用Retrofit访问接口内容
        RetrofitUtil.getInfo(id, new Callback() {
            @Override
            public void onResponse(Call call, Response response) {
            }

            @Override
            public void onFailure(Call call, Throwable t) {
            }
        });
Retrofit接口注解详解

1、@GET("url匹配路径"),标注请求为Get方式
2、@POST("url匹配路径"),标注请求为POST方式
3、@HTTP(method = "GET",path = "url匹配路径",hasBody = false"),配置请求方式,配置请求路径,配置是否有请求体
4、@Path("replace"),替代Url {replace} 中的字段
5、@Query("id") && @QueryMap,配置Get请求方式的传参
6、@Url,被注解标识的传参,作为Retrofit的请求路径
7、@FormUrlEncoded,配置表单提交方式的Post请求
8、@Field("id") && @FieldMap,配置表单提交方式的传参
9、@Multipart,配置文件提交方式的Post请求
10、@Part("id")&& @PartMap,配置文件提交方式的传参
11、@Header("name:wjx"),传递单个请求头
12、@Headers("name:wjx","pass:wjx"),传递多个请求头,以","分隔开
13、@Body,传递

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