Spring jsp 验证 form:errors标签

1 在model层添加验证规则

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@NotNull @Size(min=2,max =30,message="姓名在2-30个字符之间") private String username;

2. 在model层添加验证规则

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@PostMapping("/save") public String save(@Valid User user, BindingResult result, RedirectAttributes redirectAttributes,Model model) {       if(result.hasErrors()){         user.setXb("女");         model.addAttribute("user",user);         model.addAttribute("jinengItme",jineng());         model.addAttribute("guxiang",getGuxiang());         return "hello";     }

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1	@Valid导入验证规则,BindingResult导入验证信息

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1	result.hasErrors()遍历错误信息并输出3.在视图层使用form:errors标签显示错误

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1	<form:errors path="username" />