Question

任何人都可以使用Spring MVC和thymeleaf-spring4库来提供用于验证HTML表单的示例Java代码（例如：表单属性不为null，最小和最大大小）吗？

Answer 1

最简单的是，您需要使用所需的约束来注释您的@Entity public class User { @Id @GeneratedValue(strategy = GenerationType.AUTO) private long id; @NotNull private String login; @Size(min=2, max=30) private String firstName; @Min(18) private int age; }对象（在本例中为用户）：

javax.validation.constraints

这些注释来自@Valid。

在此之后你需要修改你的控制器，你需要澄清你的控制器该对象必须是@RequestMapping(method=RequestMethod.POST) public String registerUser(@Valid final User user, final BindingResult bindingResult) { if (bindingResult.hasErrors()) { return "form"; } // Your code return "redirect:/userList"; }：

BindingResult

错误存储在<span th:if="${#fields.hasErrors('login')}" th:errors="*{login}"></span>。

中

最后显示错误：

ModelAndView

修改

返回@RequestMapping(method=RequestMethod.POST) public ModelAndView registerUser(@Valid final User user, final BindingResult bindingResult) { if (bindingResult.hasErrors()) { ModelAndView mav = new ModelAndView("form"); mav.addObject(bindingResult); return mav; } }

RewriteCond %{HTTP_HOST} ^www2\.sitea\.com$ [OR] RewriteCond %{HTTP_HOST} ^www\.www2\.sitea\.com$ [NC] RewriteRule ^(.*)$ http://www2.siteb.com/$1 [R=301,L]

这些是java验证API的最新maven依赖项

1.dependency groupId javax.validation artifactId validation-api 版本 1.1.0.Final

2.dependency groupId org.hibernate artifactId hibernate-validator 版本 5.0.1.Final

Answer 2

看看这个：

首先是对象......

public class PruebaFormCommand {

@NotEmpty
@Size(min = 3, max = 50)
private String textoPrueba;

public String getTextoPrueba() {
    return textoPrueba;
}

public void setTextoPrueba(String textoPrueba) {
    this.textoPrueba = textoPrueba;
}

}

然后，控制器：

@Controller
public class PruebaFormController {

@RequestMapping("/pruebaform")
public String pruebaForm(Model model){

    model.addAttribute("pruebaFormCommand", new PruebaFormCommand());

    return "pruebaform";
}

@RequestMapping(value = "/dopruebaform", method = RequestMethod.POST)
public String doPruebaForm(@Valid PruebaFormCommand pruebaFormCommand, BindingResult bindingResult){

    if (bindingResult.hasErrors()) {
        return "pruebaform";
    }

    return "pruebaformcomplete";

}

}

然后，HTML：

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8"/>

    <link href="../static/css/bootstrap-3.3.4-dist/css/bootstrap.min.css" rel="stylesheet" media="screen"
          th:href="@{/css/bootstrap-3.3.4-dist/css/bootstrap.min.css}"/>

    <script src="../static/js/jquery-2.1.4.min.js"
            th:src="@{/js/jquery-2.1.4.min.js}"></script>

    <link th:href="@{/css/custom.css}" rel="stylesheet" media="screen"/>
    <title>Checkout</title>
</head>
<body>
<div class="container">
    <h2>PRUEBA Form</h2>

    <form class="form-horizontal" th:object="${pruebaFormCommand}" th:action="@{/dopruebaform}" method="post">

        <div th:if="${#fields.hasErrors('*')}" class="alert alert-danger">
            <p th:text="#{pruebaFormCommand.hasErrors}">Error Message</p>
        </div>

        <div class="form-group" th:class="${#fields.hasErrors('textoPrueba')} ? 'form-group has-error' : 'form-group'">
            <label class="col-sm-2 control-label">Meteme algo payo:</label>
            <div class="col-sm-10">
                <input type="text" class="form-control" th:field="*{textoPrueba}" th:errorclass="has-error"/>

                <span class="help-block" th:if="${#fields.hasErrors('textoPrueba')}">
                       <ul>
                           <li th:each="err : ${#fields.errors('textoPrueba')}" th:text="${err}" />
                       </ul>
                </span>
            </div>
        </div>

        <div class="row">
            <button type="submit" class="btn btn-default">Submit</button>
        </div>
    </form>
</div>
</body>
</html>

最后，请添加message.properties：

pruebaFormCommand.hasErrors = Porfa corrige los errores： NotEmpty.pruebaFormCommand.textoPrueba = {0}caracteresmínimo.... Size.pruebaFormCommand.textoPrueba = {0} debe tener entre {2} y {1} caracteres

春季4和百里香叶形式验证

2 个答案: