Android学习笔记 37. OKhttp自定义配置

Android学习笔记

Android常用框架——网络加载框架OkHttp

37. OKhttp自定义配置

37.1 Builder构建者

OkHttpClient okHttpClient = new OkHttpClient.Builder().build();
1

提供更多操作

37.2 拦截器

OkHttpClient okHttpClient = new OkHttpClient.Builder().addInterceptor(new xxxx).build();
1

OkHttpClient okHttpClient = new OkHttpClient.Builder().addNetworkInterceptor(new xxxx).build();
1

一个前面执行，一个后面执行

测试

package com.dingjiaxiong.myokhttp;

import android.util.Log;

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 InterceptorUnitTest {

    @Test
    public void interceptorTest() {
        OkHttpClient okHttpClient = new OkHttpClient.Builder().addInterceptor(new Interceptor() {
            @NonNull
            @Override
            public Response intercept(@NonNull Chain chain) throws IOException {

                //前置处理
                Request request = chain.request().newBuilder().addHeader("os", "Android")
                        .addHeader("version", "1.0").build();

                Response response = chain.proceed(request);
                //后置处理

                return response;



            }
        }).build();
        
        //只要通过这个 okHttpClient 发起的请求，都会经过拦截器。
        
        Request request = new Request.Builder().url("https://www.httpbin.org/get?a=1&b=2").build();

        Call call = okHttpClient.newCall(request);
        try {
            Response response = call.execute();
            System.out.println(response.body().string());
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53

addNetworkInterceptor和addInterceptor的执行顺序

说明addInterceptor拦截器优先执行。与代码书写时前后顺序无关。

可以添加任意多个拦截器。

37.3 缓存与Cookie

OKhttp按照http协议的规则实现了缓存的处理

当发起第一次请求之后，如果后续还需要进行同样的请求，此时如果符合缓存规则，则可以减少与服务器的网络通信，直接从本地文件缓存中读取响应返回给请求者。

【默认情况下，OKhttp的缓存是关闭状态，需要开启】

配置这个后，自动开启缓存

cookie是某些网站为了辨别用户身份，进行会话跟踪(比如确定登录状态)而存储在用户本地终端上的数据(通常经过加密)，由用户客户端计算机暂时或永久保存的信息。

玩安卓：https://www.wanandroid.com/

开放API

cookie使用演示

package com.dingjiaxiong.myokhttp;

import androidx.annotation.NonNull;

import org.junit.Test;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import okhttp3.Cache;
import okhttp3.Call;
import okhttp3.Cookie;
import okhttp3.CookieJar;
import okhttp3.FormBody;
import okhttp3.HttpUrl;
import okhttp3.Interceptor;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class CookieUnitTest {
    //用全局变量接收
    Map<String , List<Cookie>> cookies = new HashMap<>();

    @Test
    public void cookieTest() {
        OkHttpClient okHttpClient = new OkHttpClient.Builder()
                .cookieJar(new CookieJar() {
                    @Override
                    public void saveFromResponse(@NonNull HttpUrl httpUrl, @NonNull List<Cookie> list) {
                        cookies.put(httpUrl.host(),list);
                    }

                    @NonNull
                    @Override
                    public List<Cookie> loadForRequest(@NonNull HttpUrl httpUrl) {

                        if (httpUrl.host().equals("www.wanandroid.com")) {
                            List<Cookie> cookies = CookieUnitTest.this.cookies.get(httpUrl.host());
                            return cookies == null ? new ArrayList<>() : cookies;
                        }
                        return new ArrayList<>();
                    }
                })
                .build();

        FormBody formBody = new FormBody.Builder()
                .add("username", "dingjiaxiong")
                .add("password", "200039").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();
        }


        //请求收藏文章列表接口

        request = 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();
        }

    }
}
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81