SpringBoot2Thymeleaf服务器端表单验证实现详解

      org.springframework.boot
      spring-boot-starter-web
    

    
      org.springframework.boot
      spring-boot-starter-thymeleaf
    

    
      org.springframework.boot
      spring-boot-devtools
    

package com.example.demo;

import org.hibernate.validator.constraints.Length;

import javax.validation.constraints.NotBlank;
import javax.validation.constraints.Size;

public class User {
  @NotBlank(message = "用户名不能为空")
  String name;
  @Length(min = 11, max = 11, message = "手机号长度必须11位")
  String phone;
  @Size(min = 6, max = 20, message = "密码长度6-20位")
  String password;
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public String getPhone() {
    return phone;
  }
  public void setPhone(String phone) {
    this.phOne= phone;
  }
  public String getPassword() {
    return password;
  }
  public void setPassword(String password) {
    this.password = password;
  }
}

package com.example.demo;

import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.validation.ObjectError;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.validation.Valid;
import java.util.List;

@Controller
public class FormController {
  @RequestMapping("/{form}")
  public String form(@PathVariable String form, @ModelAttribute User user){
    return form;
  }

  @PostMapping("/submit")
  public String submit(@Valid User user, BindingResult result){
    if (result.hasErrors()) {
      List list = result.getAllErrors();
      for (ObjectError error : list) {
        System.out.println(error.getDefaultMessage());
      }
      return "form";
    }
    //业务逻辑处理
    return "form";
  }
}

  
  
  


  
    

      

        
用户名：
        

          
        
      
      

        
手机号：
        

          
        
      
      

        
密码：