- URL重定向
- 请求体数据加密
- HEAD动态添加
- 请求日志抓取
URL重定向
如何重定向,说白了就是更换个新的url,但是一般服务端做比较好,客户端就显得有些鸡肋。但是这个东西日常也会有用到,比如一些场景,测试生成环境的切换。业务多了,几个人混合开发的后台,每个人的代码不同意导致了baseurl还不同,这时候可以通过一个入口来修改就行,不然每个地方都去修改,接口量大的话会很麻烦。
- 自定义一个Interceptor(TestInterceptor后面都是基于这个来讲解),直接创建个类实现Interceptor接口即可,然后在Okhttp初始化的是添加这个拦截器即可
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| public class TestInterceptor implements Interceptor { @Override public Response intercept(Chain chain) throws IOException {
return null; } }
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然后在你需要初始化的okhttp的地方添加这个拦截器
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| public class TestActivity extends AppCompatActivity { @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);
OkHttpClient build = new OkHttpClient.Builder() .addInterceptor(new TestInterceptor()) .build(); } }
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那么接下来我们需要干什么呢,拦截器已经写好了,既然定义是拦截器,肯定请求体信息都在那里。我们可以在接口Interceptor里面的方法intercept给了我们一个参数Chain,一切的源头都在这里面。来看看接下来如何进行骚操作来改变初始的URL达到重定向的功能
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| public class TestInterceptor implements Interceptor { private String newHost = "127.0.0.1"; @Override public Response intercept(Chain chain) throws IOException { Request request = chain.request(); HttpUrl url = request.url(); String scheme = url.scheme(); String host = url.host(); String path = url.encodedPath(); String query = url.encodedQuery();
StringBuffer sb = new StringBuffer(); String newUrl = sb.append(scheme).append(newHost).append(path).append("?").append(query).toString();
Request.Builder builder = request.newBuilder() .url(newUrl);
return chain.proceed(builder.build()); } }
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上面只是简单的换了一下host retrofit可以轻易做到,在构造retrofit的时候可以修改baseUrl,但是如果要换path呢,这时候可能retrofit不是那么好做,而且你需要每个地方都要换,这时候你可以在这里当成一个统一的入口new一个新的path即可。简单吧,对于后面的每个字段说明意思我在后面也有备注,可以看到拆分后的样子
请求体数据加密
既然要对请求体加密,那肯定要知道请求体在哪里,然后才能加密,其实都一样不论是加密url里面的query内容还是加密body体里面的都一样,只要拿到了对应的数据我们想怎么做怎么,有的接口比较奇葩,他需要根据请求体的内容进行签名认证。不论如何我们拿到了请求体当然想怎么样就怎么样,看下嘛的操作
- 加密query内容
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| public class TestInterceptor implements Interceptor { private String newHost = "127.0.0.1";
@Override public Response intercept(Chain chain) throws IOException { Request request = chain.request(); HttpUrl url = request.url();
String scheme = url.scheme(); String host = url.host(); String path = url.encodedPath(); String query = url.encodedQuery();
StringBuffer sb = new StringBuffer(); sb.append(scheme).append(newHost).append(path).append("?"); Set<String> queryList = url.queryParameterNames(); Iterator<String> iterator = queryList.iterator();
for (int i = 0; i < queryList.size(); i++) {
String queryName = iterator.next(); sb.append(queryName).append("="); String queryKey = url.queryParameter(queryName); sb.append(CommonUtils.getMD5(queryKey)); if (iterator.hasNext()) { sb.append("&"); } }
String newUrl = sb.toString();
Request.Builder builder = request.newBuilder() .url(newUrl);
return chain.proceed(builder.build()); } }
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这样拼接的query内容就可以直接统一加密了。我这里只是简单的md5加密 如果说服务端和客户端定义了一套加密解密协议,就可以在这里进行特定的加密方式进行加密
- 加密body体内容
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| public class TestInterceptor implements Interceptor { private String newHost = "127.0.0.1";
public static String requestBodyToString(RequestBody requestBody) throws IOException { Buffer buffer = new Buffer(); requestBody.writeTo(buffer); return buffer.readUtf8(); }
@Override public Response intercept(Chain chain) throws IOException { Request request = chain.request(); HttpUrl url = request.url();
String scheme = url.scheme(); String host = url.host(); String path = url.encodedPath(); String query = url.encodedQuery();
StringBuffer sb = new StringBuffer(); sb.append(scheme).append(newHost).append(path).append("?"); Set<String> queryList = url.queryParameterNames(); Iterator<String> iterator = queryList.iterator();
for (int i = 0; i < queryList.size(); i++) {
String queryName = iterator.next(); sb.append(queryName).append("="); String queryKey = url.queryParameter(queryName); sb.append(CommonUtils.getMD5(queryKey)); if (iterator.hasNext()) { sb.append("&"); } }
String newUrl = sb.toString();
RequestBody body = request.body(); String bodyToString = requestBodyToString(body); TestBean testBean = GsonTools.changeGsonToBean(bodyToString, TestBean.class); String userPassword = testBean.getUserPassword(); testBean.setUserPassword(CommonUtils.getMD5(userPassword));
String testGsonString = GsonTools.createGsonString(testBean); RequestBody requestBody = RequestBody.create(MediaType.parse("application/json"), testGsonString);
Request.Builder builder = request.newBuilder() .post(requestBody) .url(newUrl);
return chain.proceed(builder.build()); } }
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从上面可以看出我们先拿到body体的内容然后解析后,拿到对应的实体类,然后进行加密,再次创建一个新的body体里面然后post过去,即可达到body体加密,我这只是一种body加密方法,也有可能是拿到body然后进行加密然后对加密后的东西加入head 当成签名使用。
最终这种拦截器方式的加密也是一种统一代码入口的方式。
HEAD动态添加
在日常的开发中,可能每个接口对应的header不同有的多有的少。不可能说每个接口都写一个拦截器进行添加头部。这时候我们可以换个思维来考虑这个问题。怎么做呢,其实也是为了统一代码,同一种操作不要再多个地方进行,这样修改起来很麻烦。统一入口,统一出口。
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| public class TestInterceptor implements Interceptor { private String newHost = "127.0.0.1"; private String path1 = "/test/upload/img"; private String path2 = "/test/upload/voice";
public static String requestBodyToString(RequestBody requestBody) throws IOException { Buffer buffer = new Buffer(); requestBody.writeTo(buffer); return buffer.readUtf8(); }
@Override public Response intercept(Chain chain) throws IOException { Request request = chain.request(); HttpUrl url = request.url();
String scheme = url.scheme(); String host = url.host(); String path = url.encodedPath(); String query = url.encodedQuery();
StringBuffer sb = new StringBuffer(); sb.append(scheme).append(newHost).append(path).append("?"); Set<String> queryList = url.queryParameterNames(); Iterator<String> iterator = queryList.iterator();
for (int i = 0; i < queryList.size(); i++) {
String queryName = iterator.next(); sb.append(queryName).append("="); String queryKey = url.queryParameter(queryName); sb.append(CommonUtils.getMD5(queryKey)); if (iterator.hasNext()) { sb.append("&"); } }
String newUrl = sb.toString();
RequestBody body = request.body(); String bodyToString = requestBodyToString(body); TestBean testBean = GsonTools.changeGsonToBean(bodyToString, TestBean.class); String userPassword = testBean.getUserPassword(); testBean.setUserPassword(CommonUtils.getMD5(userPassword));
String testGsonString = GsonTools.createGsonString(testBean); RequestBody requestBody = RequestBody.create(MediaType.parse("application/json"), testGsonString);
Request.Builder builder = request.newBuilder() .post(requestBody) .url(newUrl);
switch (path) { case path1: builder.addHeader("token","token"); break; case path2: builder.addHeader("token","token"); builder.addHeader("uid","uid"); break; }
return chain.proceed(builder.build()); } }
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骚不骚,根据url中path的不同来动态的添加header,其实写代码吗?每个人实现的方式不同,只要路子对,怎么撸都行,看个人。
请求日志抓取
这个其实已经有现成的log拦截器了,大家日常开发中已经有用过,但是如果说我们只想看到我想要的,过滤那些不要的东西。怎么办呢。只能自己来自定义了。把自己需要的东西打印出来。以免太多每次看很乱。这时候怎么通过拦截器完成这样的一个骚操作呢。也很简单,基于上面的基础我们应该该拿到的都拿到了。
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| public class TestInterceptor implements Interceptor { private String newHost = "127.0.0.1"; private String path1 = "/test/upload/img"; private String path2 = "/test/upload/voice"; private String TAG = "TestInterceptor"; public static String requestBodyToString(RequestBody requestBody) throws IOException { Buffer buffer = new Buffer(); requestBody.writeTo(buffer); return buffer.readUtf8(); }
@Override public Response intercept(Chain chain) throws IOException { Request request = chain.request(); Response response = chain.proceed(request);
HttpUrl url = request.url(); String scheme = url.scheme(); String host = url.host(); String path = url.encodedPath(); String query = url.encodedQuery();
RequestBody body = request.body(); String bodyToString = requestBodyToString(body);
Log.e(TAG,scheme); Log.e(TAG,host); Log.e(TAG,path); Log.e(TAG,query);
if (response != null) { ResponseBody responseBody = response.body(); long contentLength = responseBody.contentLength(); String bodySize = contentLength != -1 ? contentLength + "-byte" : "unknown-length";
Log.e(TAG,response.code() + ' ' + response.message() + ' ' + response.request().url()+' ' + bodySize );
Headers headers = response.headers(); for (int i = 0, count = headers.size(); i < count; i++) { Log.e(TAG,headers.name(i) + ": " + headers.value(i)); }
}
return chain.proceed(request); } }
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