ratrofit +okhttp + gson 解析数据为空 （接口已返回json数据）

Posted 2022-03-19 我叫白小飞

这真是个无语的问题，我先是以为接口数据格式变了，但是我检查了json，发现没有问题，有把所有的字段对了一遍，命名也没有问题，然后就开始打断点，把request和response都打印了一遍，发现response里的解析的body确实是空的，然后就去找解析的位置，因为使用了ratrofit + okhttp + gson的框架结构，于是在okhttpCall的enqueue方法中,

public void enqueue(final Callback<T> callback) 
        Utils.checkNotNull(callback, "callback == null");
        okhttp3.Call call;
        Throwable failure;
        synchronized(this) 
            if (this.executed) 
                throw new IllegalStateException("Already executed.");
            

            this.executed = true;
            call = this.rawCall;
            failure = this.creationFailure;
            if (call == null && failure == null) 
                try 
                    call = this.rawCall = this.createRawCall();
                 catch (Throwable var7) 
                    failure = this.creationFailure = var7;
                
            
        

        if (failure != null) 
            callback.onFailure(this, failure);
         else 
            if (this.canceled) 
                call.cancel();
            

            call.enqueue(new okhttp3.Callback() 
                public void onResponse(okhttp3.Call call, Response rawResponse) throws IOException 
                    retrofit2.Response response;
                    try 
                        response = OkHttpCall.this.parseResponse(rawResponse);
                     catch (Throwable var5) 
                        this.callFailure(var5);
                        return;
                    

                    this.callSuccess(response);
                

                public void onFailure(okhttp3.Call call, IOException e) 
                    try 
                        callback.onFailure(OkHttpCall.this, e);
                     catch (Throwable var4) 
                        var4.printStackTrace();
                    

                

                private void callFailure(Throwable e) 
                    try 
                        callback.onFailure(OkHttpCall.this, e);
                     catch (Throwable var3) 
                        var3.printStackTrace();
                    

                

                private void callSuccess(retrofit2.Response<T> response) 
                    try 
                        callback.onResponse(OkHttpCall.this, response);
                     catch (Throwable var3) 
                        var3.printStackTrace();
                    

                
            );
        
    

注意到这个方法：OkHttpCall.this.parseResponse

retrofit2.Response<T> parseResponse(Response rawResponse) throws IOException 
        ResponseBody rawBody = rawResponse.body();
        rawResponse = rawResponse.newBuilder().body(new OkHttpCall.NoContentResponseBody(rawBody.contentType(), rawBody.contentLength())).build();
        int code = rawResponse.code();
        if (code >= 200 && code < 300) 
            if (code != 204 && code != 205) 
                OkHttpCall.ExceptionCatchingRequestBody catchingBody = new OkHttpCall.ExceptionCatchingRequestBody(rawBody);

                try 
                    T body = this.serviceMethod.toResponse(catchingBody);
                    return retrofit2.Response.success(body, rawResponse);
                 catch (RuntimeException var9) 
                    catchingBody.throwIfCaught();
                    throw var9;
                
             else 
                rawBody.close();
                return retrofit2.Response.success((Object)null, rawResponse);
            
         else 
            retrofit2.Response var5;
            try 
                ResponseBody bufferedBody = Utils.buffer(rawBody);
                var5 = retrofit2.Response.error(bufferedBody, rawResponse);
             finally 
                rawBody.close();
            

            return var5;
        
    

T body = this.serviceMethod.toResponse(catchingBody);这个方法返回了解析出来的数据，继续跟：

    R toResponse(ResponseBody body) throws IOException 
        return this.responseConverter.convert(body);
    

它的实现是通过gson来做的，这个就不细看了，主要看一下返回值，直接是空的，然后，然后提示一个错误，某个字段解析出错，但是这里边直接catch 了，我又检查了该字段，发现是字段类型定义有问题，本来是个long类型的，可是接口返回的是个string类型的，解析异常。