java - 无法从 START_ARRAY 中反序列化 java.lang.String 的实例

Question

@JsonIgnoreProperties(ignoreUnknown = true)
public class TestResult {
private Map<String, String> datas;
>
......}

当我按如下方式使用 RestTemplate 时，我收到了错误消息作为标题

TestResult result= restTemplate.postForObject(AppConstants.URL +Secure/View/getTest",request, TestResult.class);

当我使用 jmeter 时尝试获取的数据是正确的，但在 android 上出现错误(使用 RestTemplate)请帮我解决一下，谢谢!

10-17 17:08:27.571: E//RequestProcessor.java:250(16865): 17:08:27.570 pool-12-thread-1 An exception occured during request network execution :Could not read JSON: Can not deserialize instance   of java.lang.String out of START_ARRAY token
10-17 17:08:27.571: E//RequestProcessor.java:250(16865):  at [Source: libcore.net.http.ChunkedInputStream@41b46428; line: 1, column: 11] (through reference chain: model.vo.TestResult["datas"]); nested exception is org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of java.lang.String out of START_ARRAY token
10-17 17:08:27.571: E//RequestProcessor.java:250(16865):  at [Source: libcore.net.http.ChunkedInputStream@41b46428; line: 1, column: 11] (through reference chain: model.vo.TestResult["datas"])
10-17 17:08:27.571: E//RequestProcessor.java:250(16865): org.springframework.http.converter.HttpMessageNotReadableException: Could not read JSON: Can not deserialize instance of java.lang.String out of START_ARRAY token
10-17 17:08:27.571: E//RequestProcessor.java:250(16865):  at [Source: libcore.net.http.ChunkedInputStream@41b46428; line: 1, column: 11] (through reference chain: model.vo.TestResult["datas"]); nested exception is org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of java.lang.String out of START_ARRAY token
10-17 17:08:27.571: E//RequestProcessor.java:250(16865):  at [Source: libcore.net.http.ChunkedInputStream@41b46428; line: 1, column: 11] (through reference chain: model.vo.TestResult["datas"])
10-17 17:08:27.571: E//RequestProcessor.java:250(16865):    at org.springframework.http.converter.json.MappingJacksonHttpMessageConverter.readInternal(MappingJacksonHttpMessageConverter.java:125)
10-17 17:08:27.571: E//RequestProcessor.java:250(16865):    at org.springframework.http.converter.AbstractHttpMessageConverter.read(AbstractHttpMessageConverter.java:147)
10-17 17:08:27.571: E//RequestProcessor.java:250(16865):    at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:76)
10-17 17:08:27.571: E//RequestProcessor.java:250(16865):    at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:484)
10-17 17:08:27.571: E//RequestProcessor.java:250(16865):    at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:439)
10-17 17:08:27.571: E//RequestProcessor.java:250(16865):    at org.springframework.web.client.RestTemplate.postForObject(RestTemplate.java:317)
10-17 17:08:27.571: E//RequestProcessor.java:250(16865):    at service.TestRequest.loadDataFromNetwork(TestRequest.java:73)
10-17 17:08:27.571: E//RequestProcessor.java:250(16865):    at service.TestRequest.loadDataFromNetwork(TestRequest.java:1)
10-17 17:08:27.571: E//RequestProcessor.java:250(16865):    at com.octo.android.robospice.request.CachedSpiceRequest.loadDataFromNetwork(CachedSpiceRequest.java:27)

Answer 1

检查原始响应，尝试在浏览器或 rest 客户端中点击该 url 以查看返回的内容。

Could not read JSON: Can not deserialize instance of java.lang.String out of START_ARRAY token

Can not deserialize instance of java.lang.String out of START_ARRAY tokenchain: model.vo.TestResult["datas"])

仅凭这些信息量很难确定。看起来 json 响应包含一个数组对象，但 java bean 字段是一个字符串。