robospice中的json读取错误

Question

Logcat 错误

07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678): 06:43:48.147 Thread-9164 An exception occurred during request network execution :Could not read JSON: Can not deserialize instance of java.lang.String out of START_OBJECT token
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):  at [Source: java.util.zip.GZIPInputStream@420e4cc8; line: 1, column: 1]; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.lang.String out of START_OBJECT token
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):  at [Source: java.util.zip.GZIPInputStream@420e4cc8; line: 1, column: 1]
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678): org.springframework.http.converter.HttpMessageNotReadableException: Could not read JSON: Can not deserialize instance of java.lang.String out of START_OBJECT token
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):  at [Source: java.util.zip.GZIPInputStream@420e4cc8; line: 1, column: 1]; nested exception is com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.lang.String out of START_OBJECT token
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):  at [Source: java.util.zip.GZIPInputStream@420e4cc8; line: 1, column: 1]
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):    at org.springframework.http.converter.json.MappingJackson2HttpMessageConverter.readInternal(MappingJackson2HttpMessageConverter.java:126)
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):    at org.springframework.http.converter.AbstractHttpMessageConverter.read(AbstractHttpMessageConverter.java:147)
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):    at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:76)
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):    at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:484)
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):    at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:439)
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):    at org.springframework.web.client.RestTemplate.postForObject(RestTemplate.java:317)
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):    at com..rb.PostRequest.loadDataFromNetwork(PostRequest.java:90)
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):    at com..rb.PostRequest.loadDataFromNetwork(PostRequest.java:1)
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):    at com.octo.android.robospice.request.CachedSpiceRequest.loadDataFromNetwork(CachedSpiceRequest.java:45)
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):    at com.octo.android.robospice.request.DefaultRequestRunner.processRequest(DefaultRequestRunner.java:149)
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):    at com.octo.android.robospice.request.DefaultRequestRunner$1.run(DefaultRequestRunner.java:216)
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422)
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):    at java.lang.Thread.run(Thread.java:841)
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678): Caused by: com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.lang.String out of START_OBJECT token
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):  at [Source: java.util.zip.GZIPInputStream@420e4cc8; line: 1, column: 1]
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):    at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:575)
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):    at com.fasterxml.jackson.databind.deser.std.StringDeserializer.deserialize(StringDeserializer.java:46)
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):    at com.fasterxml.jackson.databind.deser.std.StringDeserializer.deserialize(StringDeserializer.java:11)
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):    at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2888)
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2094)
07-30 06:43:48.135: E//DefaultRequestRunner.java:153(29678):    at org.springframework.http.converter.json.MappingJackson2HttpMessageConverter.readInternal(MappingJackson2HttpMessageConverter.java:123)

这是我使用 robospice 的代码

RestTemplate restTemplate = new RestTemplate();

 // Add the Jackson and String message converters
restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
restTemplate.getMessageConverters().add(new StringHttpMessageConverter());

// Make the HTTP POST request, marshaling the request to JSON, and the response to a 
String response = restTemplate.postForObject(url, message, String.class);
return response;

注意：相同的代码在某些 json 输出中运行良好，某些不同类型的 json，我收到此错误，我试图找出 json 结构的确切位置，但我觉得两者是相同的，所以我弄糊涂了，同时喊出这个错误的原因

Answer 1

List<HttpMessageConverter<?>> messageConverters = new ArrayList<HttpMessageConverter<?>>();
messageConverters.add(new FormHttpMessageConverter());
messageConverters.add(new StringHttpMessageConverter());
messageConverters.add(new MappingJacksonHttpMessageConverter());
restTemplate.setMessageConverters(messageConverters);

现在我得到了解决方案，但不知道怎么做，但我可以理解读取 json 的问题，根据我的理解，杰克逊从 json 到字符串的转换只是我更改并添加了这些转换后，然后工作正常

Answer 2

看起来您收到的 json 包含一个对象，而不是您期望的字符串。这是 RS 的用法和 Jackson，而不是 RS 本身。

Answer 3

您只需将@ApiParam(value = "data", required = true) 添加到方法签名中。

public Response myMethod(@NotNull @ApiParam(value = "data", required = true) final MyDTO dto)