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

"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

Answer 2

先把.get(url)改为.post

Answer 3

强答一波：
1.对于HttpRequest.get(url)方法，它通常用于发送GET请求，而GET请求通常不包含请求体。
2.使用.form(null)和.body("90c8c36f23a94c1487851129aa47d690/90c8c36f23a94c1487851129aa47d690")。这里有点混淆，因为.form(null)意味着你可能尝试发送表单数据，但.body(...)通常用于发送非表单的请求体（如JSON或纯文本）。

可以试试最原始的做法，没用过hutool

 HttpURLConnection connection = null;
        try {
            // 创建URL对象
            URL url = new URL(urlString);
            // 打开连接
            connection = (HttpURLConnection) url.openConnection();
            // 设置请求方法为POST
            connection.setRequestMethod("POST");
            // 设置Content-Type为text/plain
            connection.setRequestProperty("Content-Type", "text/plain; charset=UTF-8");
            // 设置gatewayAuth头部，根据实际需求调整
            connection.setRequestProperty("gatewayAuth", "xxxx");
            // 允许输入输出
            connection.setDoOutput(true);
            // 发送请求体
            try (OutputStream os = connection.getOutputStream()) {
                byte[] input = textContent.getBytes("UTF-8");
                os.write(input, 0, input.length);
            }
            // 获取响应码
            int responseCode = connection.getResponseCode();
            System.out.println("Response Code: " + responseCode);
            // 根据需要处理响应

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (connection != null) {
                connection.disconnect();
            }
        }

Answer 4

楼主啊，你可以加入@RequestParam("XXX") String/Int 或者MultipartFile file类型的，还是待PathParam。