Front-end data transmission error pleted 415 UNSUPPORTED_MEDIA_TYPE, Content type 'application/json; charset=UTF-8' not supported

The front end sends an array of integer types to the server and reports an error

1. Front-end code

      $(function () {
         $.ajax({
              url: "send/array/three.html",
              type: "post",
              contentType: "application/json;charset=UTF-8",
              data: JSON.stringify([5,8,12]),
              success: function (response) {
                  alert("成功"+response)
              },
              error: function (response) {
                  alert("失败"+response.toString())
              }
         })
       }); 

2. Backend code

    @RequestMapping("/send/array/three.html")
    @ResponseBody
    public String testReceiveArrayThree(@RequestBody Integer[] array) {
        Logger logger = LoggerFactory.getLogger(TestHandler.class);
        for (Integer number:array) {
            logger.info("number="+number);
        }
        return "target";
    }

3. The front end requests the back end to report an error

4. Reason: The mvc namespace of the SpringMVC configuration file is wrong

turn out to be:

After modification:

 There are thousands of errors, the same error may be caused by multiple reasons, and there are possible reasons:

1. There is no guide package jackson

        <!-- Spring 进行 JSON 数据转换依赖 -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
        </dependency>

2. The contentType does not conform to

3. The front-end request adds dataType: "json",