[Spring Boot2.4.2] JSONの送受信

src/main/resources/templates/test1/index.html

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<!DOCTYPE html>
<html lang="ja">
  <head>
    <meta charset="utf-8" />
  </head>
  <body>
    <p id="p1"></p>
    <p id="p2"></p>
  </body>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
        $("#p1").text("");
        $("#p2").text("");
        var json1 = {
            bangou: "1",
            name: "鈴木",
        };
        $.ajax({
        url: "http://localhost:8080/test1/index",
        type: "POST",
        contentType: "application/json",
        data: JSON.stringfy(json1),
        dataType: "json",
        })
        .done(function (data1, textStatus, jqXHR){
            $("#p1").text(jqXHR.status);
            $("#p2").text(JSON.stringify(data1));
        })
        .fail(function (jqXHR, textStatus, errorThrown){
            $("#p1").text(jqXHR.status);
        })
        .always(function() {});
</script>
</html>

Syain.java

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package com.example.demo;
import java.io.Serializable;
 
public class Syain implements Serializable {
    private static final long serialVersionUID = 1L;
     
    private String bangou;
    private String name;
     
    public String getBangou() {
        return bangou;
    }
    public void setBangou(String bangou) {
        this.bangou = bangou;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
}

MainController.java
L @ResponseBodyはコントローラからの戻り値を返す
L

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package com.example.demo;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
 
@RestController
@RequestMapping("/test1")
public class MainController {
     
    @PostMapping("/index")
    @ResponseBody
    public Syain output1(
            @RequestBody Syain syain) {
                System.out.println(syain.getBangou());
                System.out.println(syain.getName());
                return syain;
    }
}

2021-02-07 12:07:42.608 INFO 44783 — [ restartedMain] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 772 ms
2021-02-07 12:07:42.743 INFO 44783 — [ restartedMain] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService ‘applicationTaskExecutor’
2021-02-07 12:07:42.889 INFO 44783 — [ restartedMain] o.s.b.d.a.OptionalLiveReloadServer : LiveReload server is running on port 35729
2021-02-07 12:07:42.919 INFO 44783 — [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ”
2021-02-07 12:07:42.927 INFO 44783 — [ restartedMain] com.example.demo.TestApplication : Started TestApplication in 1.355 seconds (JVM running for 7.09)
2021-02-07 12:08:35.401 INFO 44783 — [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet ‘dispatcherServlet’
2021-02-07 12:08:35.401 INFO 44783 — [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet ‘dispatcherServlet’
2021-02-07 12:08:35.402 INFO 44783 — [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 1 ms
2021-02-07 12:08:37.410 WARN 44783 — [nio-8080-exec-2] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved [org.springframework.web.HttpRequestMethodNotSupportedException: Request method ‘GET’ not supported]

うーむ、上手く表示されんな。。