restTemplate.postForEntity 调用报错问题解决-优快云博客

在使用Spring的RestTemplate进行RESTfulAPI调用时，遇到了一个由于预期JSON格式错误引发的RestClientException。错误指出在尝试将响应转换为Map接口时，解析失败，因为预期的JSON格式不正确，遇到了未识别的tokensuccess。问题源于服务器返回的是String类型而非预设的Map类型。修正方法是将期望的响应类型从Map.class改为String.class，这样就正确地处理了返回的字符串数据，解决了问题。

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org.springframework.web.client.RestClientException: Error while extracting response for type [interface java.util.Map] and content type [application/json]; nested exception is org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Unrecognized token 'success': was expecting (JSON String, Number, Array, Object or token 'null', 'true' or 'false'); nested exception is com.fasterxml.jackson.core.JsonParseException: Unrecognized token 'success': was expecting (JSON String, Number, Array, Object or token 'null', 'true' or 'false')
at [Source: (PushbackInputStream); line: 1, column: 8]
   at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:120) ~[spring-web-5.3.2.jar!/:5.3.2]
   at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:1034) ~[spring-web-5.3.2.jar!/:5.3.2]
   at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.extractData(RestTemplate.java:1017) ~[spring-web-5.3.2.jar!/:5.3.2]
   at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:777) ~[spring-web-5.3.2.jar!/:5.3.2]
   at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:710) ~[spring-web-5.3.2.jar!/:5.3.2]
   at org.springframework.web.client.RestTemplate.postForEntity(RestTemplate.java:467) ~[spring-web-5.3.2.jar!/:5.3.2]
   at com.fasterxml.jackson.core.JsonParseException: Unrecognized token 'success': was expecting (JSON String, Number, Array, Object or token 'null', 'true' or 'false')
at [Source: (PushbackInputStream); line: 1, column: 8]
   at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:285) ~[spring-web-5.3.2.jar!/:5.3.2]
   at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.read(AbstractJackson2HttpMessageConverter.java:243) ~[spring-web-5.3.2.jar!/:5.3.2]
   at org.springframework.web.client.HttpMessageConverterExtractor.extractData(HttpMessageConverterExtractor.java:105) ~[spring-web-5.3.2.jar!/:5.3.2]
   ... 9 common frames omitted
Caused by: com.fasterxml.jackson.core.JsonParseException: Unrecognized token 'success': was expecting (JSON String, Number, Array, Object or token 'null', 'true' or 'false')
at [Source: (PushbackInputStream); line: 1, column: 8]
   at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1851) ~[jackson-core-2.11.3.jar!/:2.11.3]
   at com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:717) ~[jackson-core-2.11.3.jar!/:2.11.3]
   at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._reportInvalidToken(UTF8StreamJsonParser.java:3588) ~[jackson-core-2.11.3.jar!/:2.11.3]
   at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._handleUnexpectedValue(UTF8StreamJsonParser.java:2683) ~[jackson-core-2.11.3.jar!/:2.11.3]
   at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._nextTokenNotInObject(UTF8StreamJsonParser.java:865) ~[jackson-core-2.11.3.jar!/:2.11.3]
   at com.fasterxml.jackson.core.json.UTF8StreamJsonParser.nextToken(UTF8StreamJsonParser.java:757) ~[jackson-core-2.11.3.jar!/:2.11.3]
   at com.fasterxml.jackson.databind.ObjectMapper._initForReading(ObjectMapper.java:4664) ~[jackson-databind-2.11.3.jar!/:2.11.3]
   at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4513) ~[jackson-databind-2.11.3.jar!/:2.11.3]
   at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3521) ~[jackson-databind-2.11.3.jar!/:2.11.3]
   at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:274) ~[spring-web-5.3.2.jar!/:5.3.2]
   ... 11 common frames omitted

最后发现是调用的返回参数设置错误导致

我设置的返回参数是Map.class

restTemplate.postForEntity(url, httpEntity, Map.class);

但是我调用的链接的url返回的是返回的String类型（问题的根源）。

后设置成

restTemplate.postForEntity(url, httpEntity, String.class);

报错问题解决了！！！