注解方式实现网络请求

通过注解的方式来实现android中的网络请求思路

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需求

• 项目中需要更改网络请求框架的时候只需要添加libs不用改其他代码
• 网络中的请求方式以及参数都通过接口和注解的方式提供
• 接口不需要实现类，类似mybatis

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看看简单的demo

//定义网络接口的interface + 注解
public interface EchoService {

    @Get(path = "echo.php")
    void getUserName(
            @Param(value = "name") String name,
            @Param(value = "number") String number,
            HttpCallBack callBack
    );

    @Post(path = "echo.php")
    void postUserName(
            @Param(value = "name") String name,
            @Param(value = "number") String numbser,
            HttpCallBack callBack
    );

    @Get(path = "echo.php")
    void getUserAge(
        @Param(value = "age") int age,
        HttpCallBack callBack
    );

}

使用的时候仅仅只需

EchoService echoService = XHttpClient.getServiceByClass(EchoService.class);
echoService.getUserAge(100,  new HttpCallBack() {
     @Override
     public void success(String content) {
             contentTextView.setText(content);
     }

     @Override
     public void error(int code, String message) {

     }
});

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需要解决的问题

• 注解的获取，可以通过class类对象获取
• 获取到注解后通过接口返回一个实例，这个可以用动态代理实现
• 发起网络请求，由于需要在各个框架之间切换，可以用接口来实现

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获取注解

Annotation[] methodAnnotations = method.getAnnotations();
        boolean isGet = true;
        String childPath = null;
        String[] ks = null;
        String[] vs = null;
        for(Annotation a : methodAnnotations){
            
            if(a instanceof Get){
                Get aGet = (Get) a;
                childPath = aGet.path();
                isGet = true;
            }
            
            if(a instanceof Post){
                Post aPost = (Post) a;
                childPath = aPost.path();
                isGet = false;
            }
            
            if(a instanceof Header){
                Header aHeader = (Header) a;
                String[] keys = aHeader.key();
                String[] values = aHeader.value();
                if(keys != null && values != null && keys.length == values.length && keys.length > 0){
                    ks = keys;
                    vs = values;
                }
            }
        }//end for

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动态代理

InvocationHandler

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网络请求的接口

public interface HttpClient {

    void executeRequest(HttpEntry httpEntry, HttpCallBack callBack);
    
}

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不同的网络框架使用不同的实现

public class HttpClientForXUtils implements HttpClient {

    @Override
    public void executeRequest(HttpEntry httpEntry, HttpCallBack callBack) {
        RequestParams requestParams = new RequestParams(httpEntry.getBasePath() + httpEntry.getChildPath());
        requestParams.setMethod(httpEntry.getMethod() == HttpEntry.METHOD_GET ? HttpMethod.GET : HttpMethod.POST);
        if(httpEntry.getParamsList() != null){
            for(int i=0;i < httpEntry.getParamsList().size();i++){
                ParamEntry entry = httpEntry.getParamsList().get(i);
                if(entry.getValue() instanceof File){
                    requestParams.addBodyParameter(entry.getKey(),(File) entry.getValue());
                }else{
                    requestParams.addBodyParameter(entry.getKey(),entry.getValue().toString());
                }
            }
        }

        if(httpEntry.getMethod() == HttpEntry.METHOD_GET){
            get(requestParams,callBack);
        }

        if(httpEntry.getMethod() == HttpEntry.METHOD_POST){
            post(requestParams,callBack);
        }

    }//end method

    private void post(RequestParams requestParams, final HttpCallBack httpCallBack){
        x.http().get(requestParams, new Callback.CommonCallback<String>() {
            @Override
            public void onSuccess(String result) {
                if(httpCallBack != null){
                    httpCallBack.success(result);
                }
            }

            @Override
            public void onError(Throwable ex, boolean isOnCallback) {
                if(httpCallBack != null){
                    httpCallBack.error(404,ex.getMessage());
                }
            }

            @Override
            public void onCancelled(CancelledException cex) {

            }

            @Override
            public void onFinished() {

            }
        });
    }


    private void get(RequestParams requestParams, final HttpCallBack httpCallBack){
        x.http().get(requestParams, new Callback.CommonCallback<String>() {
            @Override
            public void onSuccess(String result) {
                httpCallBack.success(result);
            }

            @Override
            public void onError(Throwable ex, boolean isOnCallback) {
                httpCallBack.error(404,ex.getMessage());
            }

            @Override
            public void onCancelled(CancelledException cex) {

            }

            @Override
            public void onFinished() {

            }
        });
    }
}

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