SpringMVC07_数据校验

落日映苍穹つ 2023-02-20 07:41 3阅读 0赞

**SpringMVC07\_数据校验**

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##### 基于Validator接口的验证器 #####

*  **Account 实体类：**

package com.blu.entity;
    import lombok.Data;
    
    @Data
    public class Account { 
        private String name;
        private String password;
    }

*  **AccountValidator**

package com.blu.validator;
    
    import com.blu.entity.Account;
    import org.springframework.validation.Errors;
    import org.springframework.validation.ValidationUtils;
    import org.springframework.validation.Validator;
    
    public class AccountValidator implements Validator { 
        @Override
        public boolean supports(Class<?> clazz) { 
            //判断是否是Account类型，如果是则返回true，表示支持验证。
            return Account.class.equals(clazz);
        }
    
        @Override
        public void validate(Object target, Errors errors) { 
            //若name为null，则在errors中添加“姓名不能为空”的错误信息,该信息会被验证器返回给前端。
            ValidationUtils.rejectIfEmpty(errors,"name",null,"姓名不能为空");
            ValidationUtils.rejectIfEmpty(errors,"password",null,"密码不能为空");
        }
        
    }

*  **login.jsp**

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <%@ page isELIgnored="false" %>
    <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
    <html>
    	<head>
        	<title>Title</title>
    	</head>
    	<body>
        	<form:form modelAttribute="account" action="/validator/login" method="post">
            	姓名：<form:input path="name"/><form:errors path="name"/><br>
            	密码：<form:input path="password"/><form:errors path="password"/><br>
            	<input type="submit" value="登录">
        	</form:form>
        </body>
    </html>

*  **ValidatorHandler**

package com.blu.controller;
    
    import com.blu.entity.Account;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.validation.BindingResult;
    import org.springframework.validation.annotation.Validated;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.PostMapping;
    import org.springframework.web.bind.annotation.RequestMapping;
    
    @Controller
    @RequestMapping("/validator")
    public class ValidatorHandler { 
    
        @GetMapping("/login")
        public String login(Model model){ 
            model.addAttribute("account",new Account());
            return "login";
        }
    
        @PostMapping("/login")
        public String login(@Validated Account account, BindingResult bindingResult){ 
            if (bindingResult.hasErrors()){ 
                return "login";
            }else { 
                return "index";
            }
        }
    }

在请求参数上加 @Validated 注解表示开启验证
    BindingResult 会获取校验错误信息

*  在配置文件中注册验证器并使其生效：

<bean id="accountValidator" class="com.blu.validator.AccountValidator"></bean>
    <mvc:annotation-driven validator="accountValidator"></mvc:annotation-driven>

*  测试（输入http://localhost:8080/validator/login访问，因为是Get请求，故无数据校验）  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JMVV8xMTE_size_16_color_FFFFFF_t_70]
 *  不填写数据直接点击登录，此时是Post请求，校验器开始起效：  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0JMVV8xMTE_size_16_color_FFFFFF_t_70 1]

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##### 基于Annotation JSR - 303 标准的验证 #####

*  需要导入支持这种标准的依赖，这里使用 Hibernate Validator

<dependency>
    	<groupId>org.hibernate</groupId>
    	<artifactId>hibernate-validator</artifactId>
    	<version>6.0.7.Final</version>
    </dependency>
    <dependency>
    	<groupId>javax.validation</groupId>
    	<artifactId>validation-api</artifactId>
    	<version>2.0.1.Final</version>
    </dependency>
    <dependency>
    	<groupId>org.jboss.logging</groupId>
    	<artifactId>jboss-logging</artifactId>
    	<version>3.3.2.Final</version>
    </dependency>

*  通过注解的方式直接在实体类中添加相关的验证规则

package com.blu.entity;
    
    import lombok.Data;
    import javax.validation.constraints.Email;
    import javax.validation.constraints.NotEmpty;
    import javax.validation.constraints.Pattern;
    import javax.validation.constraints.Size;
    
    @Data
    public class Person { 
        @NotEmpty(message = "用户名不能为空")
        private String username;
        @Size(min = 6,max = 12, message = "密码的长度必须为6-12位")
        private String password;
        @Email(regexp = "^([a-z0-9A-Z]+[-|_|\\.]?)+[a-z0-9A-Z]@([a-z0-9A-Z]+(-[a-z0-9A-Z]+)?\\.)+[a-zA-Z]{2,}$",message ="请输入正确的邮箱格式")
        private String email;
        @Pattern(regexp = "^((13[0-9])|(15[^4])|(18[0,2,3,5-9])|(17[0-8])|(147))\\d{8}$",message = "请输入正确的电话")
        private String phone;
    }

*  在配置文件中开启注解：

<mvc:annotation-driven></mvc:annotation-driven>

*  Handler

@GetMapping("/register")
    public String register(Model model){ 
    	model.addAttribute("person",new Person());
    	return "registerpage";
    }
    
    @PostMapping("/register")
    public String register(@Valid Person person, BindingResult bindingResult){ 
    	if (bindingResult.hasErrors()){ 
    		return "registerpage";
    	}else { 
    		return "index";
    	}
    }

注意这里使用的注解不是 @Validated 而是 @Valid
    
    校验规则详解： 
    @Null 被注解的元素必须为null 
    @NotNull 被注解的元素不能为null 
    @Min(value) 被注解的元素必须是⼀个数字，其值必须⼤于等于指定的最⼩值 
    @Max(value) 被注解的元素必须是⼀个数字，其值必须⼩于于等于指定的最⼤值 
    @Email 被注解的元素必须是电⼦邮箱地址 
    @Pattern 被注解的元素必须符合对应的正则表达式 
    @Length 被注解的元素的⼤⼩必须在指定的范围内 
    @NotEmpty 被注解的字符串的值必须⾮空 
    Null 和 Empty 是不同的结果，String str = null，str 是 null，String str = ""，str 不是 null，其值为空。

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