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纠正你2点错误
1,既然前端ajax的type: "POST",那就请不要设置async: false,不然POST的意义何在?(当然这不是出错的主要原因,仅作为提醒)
2,后端SpringMvc方法的参数绑定,你这么个写法一定要加上required = false。如下:
@Controller
@RequestMapping("/ceshi")
public class ceshi {
}
这样下断点就能进入了,祝你成功