Okhttp3 -如何在Okhttp3客户端中定义特定请求

Question

我有一个递归方法，它使用okhttp3向端点发出连续的分页请求，直到属性不再存在为止。我的测试运行模拟了过程中的最后一个调用，但是我在进行2步迭代时遇到了困难。

如何在newCall()方法中定义特定的ohkttp3.Request，使其不会每次抛出一个NullPointer？下面是我的代码/测试以供参考。

错误： java.lang.NullPointerException

递推法

public JSONArray recursiveMethod(JSONArray array, String authCode, String requestUrl) {
        String nextPageAtt = "newPage";
        String newPage = null;
        Request request = new Request.Builder()
                .url(requestUrl)
                .get()
                .addHeader("Content-Type", "application/json")
                .addHeader("Authorization", authCode)
                .build();
                
        try {
            //Problem child
            okhttp3.Response response = client.newCall(request).execute();
            if (response.code() == SUCCESS_CODE && response.body() != null) {

                //Add JSON data to array 
                
                //if "newPage" attribute in response, set it here
                //only present when page != last page
                
            } else {
            }
        }
        //"newPage" attribute won't be present on the last page of data"
        if (newPage != null) {
            recursiveMethod(array, authCode, baseUrl + newPage);
        }
        return array;
    }

测试方法

@Test
void recursiveMethodNonewPage() throws IOException {
        JSONArray emptyArray = new JSONArray();
    
        final Response successResponse = new Response.Builder()
                .request(new Request.Builder().url("https://localhost:8080/getData").build()) //"newPage" not there (last call)
                .protocol(Protocol.HTTP_1_1)
                .code(SUCCESS_CODE).message("").body(
                        ResponseBody.create(
                                MediaType.parse("application/json"),
                                "/////JSON/////"
                        ))
                .build();
                
        when(remoteCall.execute()).thenReturn(successResponse);
        
        //this works when I pass "any()" but a java.lang.NullPointerException is thrown when I enter a specific Request
        when(mockClient.newCall(any())).thenReturn(remoteCall);
        
        //******Issue******
        //Need to pass a specific request on in order to simulate multiple recursive iterations
        /*Request request = new Request.Builder()
                .url(https://localhost:8080/getData)
                .get()
                .addHeader("Content-Type", "application/json")
                .addHeader("Authorization", authCode)
                .build();*/
                
        //Throws Null
        //when(mockClient.newCall(request))).thenReturn(remoteCall);
        
        JSONArray newArray = getDataUtil.recursiveMethod(emptyArray, authCodeSuccess, "https://localhost:8080/getData");
        assertEquals(4, newArray.length());
    }

Answer 1

终于在这里找到了答案：https://stackoverflow.com/a/8395685/2573297

when( method-call ).thenReturn( value1, value2, value3 );

工作测试

@Test
void recursiveMethodNonewPage() throws IOException {
        JSONArray emptyArray = new JSONArray();
    
        final Response pageOne = new Response.Builder()
                .request(new Request.Builder().url("https://localhost:8080/getData").build())
                .protocol(Protocol.HTTP_1_1)
                .code(SUCCESS_CODE).message("").body(
                        ResponseBody.create(
                                MediaType.parse("application/json"),
                                "/////JSON/////"
                        ))
                .build();
                
        final Response pageTwo = new Response.Builder()
                .request(new Request.Builder().url("https://localhost:8080/getData").build())
                .protocol(Protocol.HTTP_1_1)
                .code(SUCCESS_CODE).message("").body(
                        ResponseBody.create(
                                MediaType.parse("application/json"),
                                "/////JSON/////"
                        ))
                .build();
        
        when(mockClient.newCall(any())).thenReturn(remoteCall);
        when(remoteCall.execute()).thenReturn(pageOne, pageTwo);
        
        JSONArray newArray = getDataUtil.recursiveMethod(emptyArray, authCodeSuccess, "https://localhost:8080/getData");
        assertEquals(4, newArray.length());
    }