SpringMVC学习（三）

浅浅的花香味﹌ 2022-05-09 09:14 180阅读 0赞

### 数据校验 ###

1.导入jar包

2.配置校验器，并加入适配器

3.bean上添加校验信息

4.controller上校验信息的处理

一：jar包的导入

![70][]

二：配置校验器validator

<bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean">
            <property name="providerClass" value="org.hibernate.validator.HibernateValidator"></property>
            <property name="validationMessageSource" ref="validationMessageSource"></property>
        </bean>
        
        
        <bean id="validationMessageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
            
            <property name="basenames">
                <list>
                    <value>classpath:validationMessageSource</value>
                </list>
            </property>
            
            <property name="fileEncodings" value="utf8"></property>
            
            <property name="cacheSeconds" value="120"></property>
        </bean>
    	
    	<mvc:annotation-driven validator="validator"  />

三：在bean上添加校验信息

public class user {
    	@Size(min=3,max=10,message="{com.name.size}")
        //错误信息可以通过配置文件，也可以直接在message中直接书写
    	private String username;
    	@NotEmpty(message="密码好像空了")
    	private String password;
    }

四：controller控制器

public class show2 {
    	@RequestMapping(value="/show2")
    	public String show2(Model model,@Validated user user,BindingResult result){
                //所校验的信息后面需要跟上BindingResult result
    		if(result.hasErrors()){
    			List<ObjectError> errors = result.getAllErrors();
    			for (ObjectError Error : errors) {
    				System.out.println(Error);
    			}
    			model.addAttribute("errors", errors);
    			return "jsp/error";
    		}
    		model.addAttribute("user", user);
    		return "jsp/welcome";
    	}
    }

五：访问

![70 1][]

![70 2][]

[70]: /images/20220509/96f9111896cb48d0888ae4330060e3ea.png
[70 1]: /images/20220509/4681a2faa829453f957dd14b80ada9cf.png
[70 2]: /images/20220509/b092dee833aa43058e854696fefb094c.png