How to get the @RequestBody annotation in SpringBoot to correctly receive string parameters in non-JSON format?

In Spring Boot applications, it is crucial to properly receive request parameters, especially string parameters in non-JSON format. This article will explore how to correctly receive such parameters using the @RequestBody annotation.

We encounter a Spring Boot interface that receives string parameters using @RequestBody annotation:

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

The request parameter is: "90c8c36f23a94c1487851129aa47d690/90c8c36f23a94c1487851129aa47d690". Postman sends this parameter directly and works normally, but when sending it using the Hutool tool class, the following error occurs:

 <code>org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: ...; nested exception is com.alibaba.fastjson.JSONException: ...</code>

The root cause of the problem is that Spring Boot uses application/json to process @RequestBody parameter by default. Spring Boot treats it as JSON format when the argument is wrapped in double quotes. Therefore, for non-JSON string parameters, we need to explicitly specify the requested Content-Type .

The solution is to set the requested Content-Type to text/plain . This way, Spring Boot won't try to parse it to JSON.

The code modified using the Hutool tool class is as follows:

 HttpRequest request = HttpRequest.post(url);
request.header("Content-Type", "text/plain");
request.body("90c8c36f23a94c1487851129aa47d690/90c8c36f23a94c1487851129aa47d690");
String responseJsonStr = request.execute().body();

By setting Content-Type: text/plain , the @RequestBody annotation can correctly receive string parameters in non-JSON format. This avoids unnecessary JSON parsing errors and ensures the stability and reliability of the interface.

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