springmvc(3)验证和json操作还有异常页面

╰半橙微兮° 2022-02-16 16:41 171阅读 0赞

验证  
导入jar包  
![在这里插入图片描述][20190422194509331.png]

写提示文件(ValidataMessages.properties)

user_username_empty=\u8D26\u53F7\u4E0D\u80FD\u4E3A\u7A7A
    user_username_size=\u8D26\u53F7\u957F\u5EA6\u4E3A3~6
    user_password_empty= \u5BC6\u7801\u4E0D\u80FD\u4E3A\u7A7A
    user_password_size=\u5BC6\u7801\u957F\u5EA63~6

xml配置文件

<context:component-scan base-package="com.liy.controller"></context:component-scan>
     	
     	
     	<mvc:annotation-driven validator="validator"></mvc:annotation-driven>
     	 
     	 
        <bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean">
            <property name="providerClass"  value="org.hibernate.validator.HibernateValidator"/>
            
             
            <property name="validationMessageSource" ref="validatemessageSource"/>
        </bean>
       
        <bean id="validatemessageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource">  
            <property name="basename" value="classpath:ValidataMessages"/>  
            <property name="fileEncodings" value="utf-8"/>  
            <property name="cacheSeconds" value="120"/>  
        </bean>	
     
     
     
     </beans>

javaBean层

public class User {
    	
    	public Integer  id;
    	
    	@NotBlank(message="{user_username_empty}",groups={AvlidateGroup1.class})
    	@Size(max=6,min=3,message="{user_username_size}",groups={AvlidateGroup2.class})
    	public String username;
    	
    	@NotBlank(message="{user_password_empty}",groups={AvlidateGroup1.class})
    	@Size(max=6,min=3,message="{user_password_size}",groups={AvlidateGroup2.class})
    	public String password;
    
    
    	public User() {
    		super();
    	}
    
    
    	public User(int id, String username, String password) {
    		super();
    		this.id = id;
    		this.username = username;
    		this.password = password;
    	}

controller控制层

@Controller
    public class Validata {
    	
    	@RequestMapping("/validata")
    	@ResponseBody
    	public void validata1(@Validated(value={AvlidateGroup1.class}) User user,BindingResult br){
    		System.out.println(user);
    		List<ObjectError> objerr = br.getAllErrors();
    		  
    		if (objerr != null || objerr.size() >0) {
    			for (ObjectError objectError : objerr) {
    				System.out.println(objectError.getDefaultMessage());
    			}
    		}else {
    			System.out.println(user);
    		}
    	 
    	}
    	
    	
    	@RequestMapping("/validata1")
    	@ResponseBody
    	public void validata2(@Validated(value={AvlidateGroup2.class}) User user,BindingResult br){
    		System.out.println(user);
    		List<ObjectError> objerr = br.getAllErrors();
    		  
    		if (objerr != null || objerr.size() >0) {
    			for (ObjectError objectError : objerr) {
    				System.out.println(objectError.getDefaultMessage());
    			}
    		}else {
    			System.out.println(user);
    		}
    	 
    	}

分组的用的接口(里面不用写内容 , 就是用来区分一个属性的多个验证信息)  
![在这里插入图片描述][20190422194526221.png]

发生错误 ,跳转到错误页面

@Component
    public class MyHandlerExceptionResolver implements HandlerExceptionResolver{
    
    	@Override
    	public ModelAndView resolveException(HttpServletRequest arg0, HttpServletResponse arg1, Object arg2,
    			Exception arg3) {
    		System.out.println("出现异常了--"+arg3.getMessage());
    		ModelAndView mv = new ModelAndView();
    		mv.addObject("exe", arg3.getMessage());
    		
    		mv.setViewName("error");
    		return mv;
    	}
    
    }

配置文件

<context:component-scan base-package="com.controller,com.liy.*"></context:component-scan>
     
     	
     	<mvc:annotation-driven></mvc:annotation-driven>
     	
     	
     	
      	<bean  class="org.springframework.web.servlet.view.InternalResourceViewResolver">
     		<property name="prefix" value="/"></property>
     		<property name="suffix" value=".jsp"></property>
     	</bean>

json的转换(spring自带的就只要导入jar包就可以了 无需配置)  
导入jar包  
![在这里插入图片描述][20190422194541896.png]

controller层代码

@Controller
    public class MyController {
    	//响应返回数据转换成json只要加上@responseBody注解   
    
        //接收请求的数据转换json加上@requestBody注解
    	@RequestMapping("/fun")
    	@ResponseBody 
    	public void fun(@RequestBody User user){
    	 
    	 System.out.println(user);
    	}

使用其他的json转换的jar包

比如fastJSON

导入jar包  
![在这里插入图片描述][20190422194554367.png]

然后在配置文件里配置

<mvc:annotation-driven>
    		 <mvc:message-converters>
    		 	<bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter"></bean>
    		 </mvc:message-converters>
    	</mvc:annotation-driven>

springmvc中，直接接收json参数，如果参数中有日期的话，不需要定义日期类型转换器，日期的转换由gson/jackson/fastjson来提供。

[20190422194509331.png]: /images/20220216/d3614b29208643a18cebc95fb5388c1d.png
[20190422194526221.png]: /images/20220216/069e3c6b9e354c20ac3ddb66dde999f6.png
[20190422194541896.png]: /images/20220216/f7a293b7872b4442b779c6acfc00d1db.png
[20190422194554367.png]: /images/20220216/6078216fd4ed432bad481b605a73b5a2.png