springboot+thymeleaf中，访问请求updateUser时报错，报错内容如下：
2019-07-29 16:17:10.197 DEBUG 9820 --- [nio-8080-exec-4] c.l.y.mapper.UserMapper.findByUserId : ==> Preparing: select * from user where id = ?
2019-07-29 16:17:10.230 DEBUG 9820 --- [nio-8080-exec-4] c.l.y.mapper.UserMapper.findByUserId : ==> Parameters: 1(Integer)
2019-07-29 16:17:10.267 DEBUG 9820 --- [nio-8080-exec-4] c.l.y.mapper.UserMapper.findByUserId : <== Total: 1
2019-07-29 16:17:12.474 DEBUG 9820 --- [nio-8080-exec-3] c.l.y.mapper.UserMapper.updateUserInfo : ==> Preparing: update user set name=?,age=?,address=?,qq=?,weixin=?,email=?,sex=?,birthday=?,account=? where id=?
2019-07-29 16:17:12.477 DEBUG 9820 --- [nio-8080-exec-3] c.l.y.mapper.UserMapper.updateUserInfo : ==> Parameters: 王二麻子222(String), 24(Integer), 上海宝山(String), 12345678910(String), weixin123(String), 1213@123.com(String), 1(Integer), 1992-12-26 22:00:00.0(Timestamp), admin(String), 1(Integer)
2019-07-29 16:17:12.479 DEBUG 9820 --- [nio-8080-exec-3] c.l.y.mapper.UserMapper.updateUserInfo : <== Updates: 1
2019-07-29 16:17:12.493 ERROR 9820 --- [nio-8080-exec-3] org.thymeleaf.TemplateEngine : [THYMELEAF][http-nio-8080-exec-3] Exception processing template "updateUser": Error resolving template [updateUser], template might not exist or might not be accessible by any of the configured Template Resolversorg.thymeleaf.exceptions.TemplateInputException: Error resolving template [updateUser], template might not exist or might not be accessible by any of the configured Template Resolversat org.thymeleaf.engine.TemplateManager.resolveTemplate(TemplateManager.java:869) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]at org.thymeleaf.engine.TemplateManager.parseAndProcess(TemplateManager.java:607) ~[thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1098) [thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]at org.thymeleaf.TemplateEngine.process(TemplateEngine.java:1072) [thymeleaf-3.0.11.RELEASE.jar:3.0.11.RELEASE]Java代码段：
package com.lucifer.youfanshopuser.controller;import com.lucifer.youfanshopuser.model.User;
import com.lucifer.youfanshopuser.service.UserService;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;import javax.annotation.Resource;/*** @author: lucifer* @date: 2019/7/29* @description:*/
@Controller
public class UserController {@ResourceUserService userService;@GetMapping(value = "/toUpdateUser")public String toUpdateUser(int id,Model model){User user = userService.findByUserId(id);model.addAttribute("user",user);return "userUpdate";}@PostMapping(value = "/updateUser")public void updateUser(User user){userService.updateUserInfo(user);}}
解决办法：
由于用的是@Controller而非@RestController注解，所以这里返回json串，需要加上@ResponseBody注解即可，否则返回的是静态页面，而不是json串，由于没有找到静态页面所以报错；
@PostMapping(value = "/updateUser")@ResponseBodypublic void updateUser(User user){userService.updateUserInfo(user);}