23.2、Android -- OkHttp3 基础学习自定义设置

说明

一个项目中的网络请求肯定不止一个。多个的话就涉及到相同的请求信息，或者相同的信息过滤条件。
因此，就需要自定义OkHttp3设置。可以通过拦截器、过滤器实现

测试方法都是在test 测试用例中进行的

拦截器

应用拦截器

使用addInterceptor

 new OkHttpClient.Builder().addInterceptor(new Interceptor() {//应用拦截器@NonNull@Overridepublic Response intercept(@NonNull Chain chain) throws IOException {Request request = chain.request().newBuilder().addHeader("SystemType", "android").addHeader("version", "20220803.001.123").build();System.out.println("version2"+chain.request().headers("version"));Response response = chain.proceed(request);return response;//正常返回，不处理//return chain.proceed(chain.request());}}).build();

网络拦截器

使用addNetworkInterceptor

 new OkHttpClient.Builder().addNetworkInterceptor(new Interceptor() {//网络拦截器@NonNull@Overridepublic Response intercept(@NonNull Chain chain) throws IOException {System.out.println("version"+chain.request().headers("version"));Request request = chain.request().newBuilder().addHeader("locDesc", "cwc").addHeader("userName", "lianmei").build();Response response = chain.proceed(request);return response;}}).build();

备注
1、addInterceptor早于addNetworkInterceptor执行
2、addInterceptor是程序增加的,
addNetworkInterceptor是网络增加，可以获取addInterceptor的请求信息
3、addInterceptor不管有误网络都会执行，
addNetworkInterceptor，有网络是才执行，没有网络时不执行

过滤器最终代码

package com.pha.four;import androidx.annotation.NonNull;import org.junit.Test;import java.io.IOException;import okhttp3.Call;
import okhttp3.Interceptor;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;public class OkHttpSetting {@Testpublic void InterCeptorTest() {OkHttpClient okHttpClient = new OkHttpClient.Builder().addInterceptor(new Interceptor() {//应用拦截器@NonNull@Overridepublic Response intercept(@NonNull Chain chain) throws IOException {Request request = chain.request().newBuilder().addHeader("SystemType", "android").addHeader("version", "20220803.001.123").build();System.out.println("version2"+chain.request().headers("version"));Response response = chain.proceed(request);return response;//正常返回，不处理//return chain.proceed(chain.request());}}).addNetworkInterceptor(new Interceptor() {//网络拦截器@NonNull@Overridepublic Response intercept(@NonNull Chain chain) throws IOException {System.out.println("version"+chain.request().headers("version"));Request request = chain.request().newBuilder().addHeader("locDesc", "cwc").addHeader("userName", "lianmei").build();Response response = chain.proceed(request);return response;}}).build();Request request = new Request.Builder().url("http://www.httpbin.org/get?a=2&b=3").build();Call call = okHttpClient.newCall(request);Response response = null;try {response = call.execute();System.out.println(response.body().string());} catch (IOException e) {e.printStackTrace();}}
}

缓存和cookie

缓存

通过.cache(new Cache(new File(“C:\Users\Cherry”),1024*1024)) 缓存

OkHttpClient okHttpClient = new OkHttpClient.Builder().cache(new Cache(new File("C:\\Users\\Cherry"),1024*1024)).build();

cookie

通过cookieJar(new CookieJar(){}）记录到程序内
通过Map<String,List> cookieMap = new HashMap<>(); 记录个网站的cookie 。

package com.pha.four;import androidx.annotation.NonNull;import org.junit.Test;import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;import okhttp3.Call;
import okhttp3.Cookie;
import okhttp3.CookieJar;
import okhttp3.FormBody;
import okhttp3.HttpUrl;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;public class OkHttpCookieTest {Map<String,List<Cookie>>  cookieMap = new HashMap<>();@Testpublic void CookieTest() {OkHttpClient okHttpClient = new OkHttpClient.Builder().cookieJar(new CookieJar() {//记录cookies@Overridepublic void saveFromResponse(@NonNull HttpUrl httpUrl, @NonNull List<Cookie> list) {cookieMap.put(httpUrl.host() ,list);}@NonNull@Overridepublic List<Cookie> loadForRequest(@NonNull HttpUrl httpUrl) {List<Cookie> cookies = OkHttpCookieTest.this.cookieMap.get(httpUrl.host());return cookies == null ? new ArrayList<>() : cookies;}}).build();FormBody formBody = new FormBody.Builder().add("username","ty082093105").add("password","123123").build();Request request = new Request.Builder().url("https://www.wanandroid.com/user/login").post(formBody).build();Call call = okHttpClient.newCall(request);try  {Response response = call.execute();System.out.println(response.body().string());} catch (IOException e) {e.printStackTrace();}//使用cookiesrequest = new Request.Builder().url("https://www.wanandroid.com/lg/collect/list/0/json").build();call = okHttpClient.newCall(request);try  {Response response = call.execute();System.out.println(response.body().string());} catch (IOException e) {e.printStackTrace();}}
}

记忆点

1、应用拦截器addInterceptor
2、网络拦截器addNetworkInterceptor
3、缓存cache
4、cookie记录：cookieJar(new CookieJar(){}).build()