java - SpringBoot的@RequestBody 注解如何接受非json格式字符串参数？

Question

如果接口注解是@RequestBody ，且修饰的是字符串参数，请求如果接受非json格式字符串参数？
最近维护公司的一个springboot项目，发现有一个controller接口写的接收参数形式很奇怪。代码如下

@ResponseBody    @PostMapping(value = "/SendNews")    public  String sendContent(HttpServletRequest request,@RequestBody String lstMsgId) {    System.out.println(lstMsgId);    return lstMsgId;}

我的请求参数是："90c8c36f23a94c1487851129aa47d690/90c8c36f23a94c1487851129aa47d690"
我用postman 请求，在raw里面带上字符串（非Json格式）可以正常请求，而使用hutool工具请求如下代码却不能请求成功。

HttpRequest request = HttpRequest.get(url);            request.header("gatewayAuth", "xxxx");            responseJsonStr = request.form(null)//表单内容                    .body("90c8c36f23a94c1487851129aa47d690/90c8c36f23a94c1487851129aa47d690")                    .timeout(50000)//超时，毫秒                    .execute().body();

报如下错误：

org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: not close json text, token : error; nested exception is com.alibaba.fastjson.JSONException: not close json text, token : error    at com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter.readType(FastJsonHttpMessageConverter.java:273)    at com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter.read(FastJsonHttpMessageConverter.java:239)    at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver.readWithMessageConverters(AbstractMessageConverterMethodArgumentResolver.java:185)    at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.readWithMessageConverters(RequestResponseBodyMethodProcessor.java:160)    at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.resolveArgument(RequestResponseBodyMethodProcessor.java:133)    at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:122)    at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:179)    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:146)    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117)    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1067)    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)    at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:209)    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153)    at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123)    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178)    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153)    at org.springframework.web.filter.CorsFilter.doFilterInternal(CorsFilter.java:91)    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178)    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153)    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178)    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153)    at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178)    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153)    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117)    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178)    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153)    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:168)    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90)    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:481)    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:130)    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93)    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:390)    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:928)    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1794)    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)    at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)    at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)    at java.lang.Thread.run(Thread.java:748)Caused by: com.alibaba.fastjson.JSONException: not close json text, token : error

我的请求参数是："90c8c36f23a94c1487851129aa47d690/90c8c36f23a94c1487851129aa47d690",但是如果改成："\"90c8c36f23a94c1487851129aa47d690/90c8c36f23a94c1487851129aa47d690\""
使用hutool工具类请求就可以了。为什么会这样？ @RequestBody String lstMsgId 怎么接收非json格式的字符串参数，求解~

Answer 1

先把.get(url)改为.post

Answer 2

"90c8c36f23a94c1487851129aa47d690/90c8c36f23a94c1487851129aa47d690"
我用postman 请求，在raw里面带上字符串（非Json格式）可以正常请求

双引号包字符 = json的字符串，所以其实还是json格式，所以可以当json解析

如何让@RequestBody解析非json的字符串？让spring不认为请求是json就行了
spring是如何识别的呢？通过Content-Type头
所以，发请求的时候，指定Content-Type头是text/plain就完事了