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通常,我们会把用户信息存放在session里面作为一个属性。就像这样。session.setAttribute(“userinfo”,userinfo)。但是这样做每次在方法前必须要先从request中获取值,这样很麻烦。但是通过spring的自定义的参数绑定可以通过自定义注解的方式来绑定参数,直接将userinfo作为参数来获取。以下是相关代码和文件配置。1.定义一个自定义注解。这里我的注解名为:RequestAttribute。package com.etoak.annotation;import java.lang.annotation.Documented;import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;@Target(ElementType.PARAMETER)@Retention(RetentionPolicy.RUNTIME)@Documentedpublic @interface RequestAttribute {String value();}继承spring 的HandlerMethodArgumentResolver,通过重写supportParameter()方法和resolverArgument()方法对参数注入。package com.etoak.core;import org.springframework.core.MethodParameter;import org.springframework.web.bind.support.WebDataBinderFactory;import org.springframework.web.context.request.NativeWebRequest;import org.springframework.web.context.request.WebRequest;import org.springframework.web.method.support.HandlerMethodArgumentResolver;import org.springframework.web.method.support.ModelAndViewContainer;import com.etoak.annotation.RequestAttribute;public class RequestAttributeMethodResolver implements HandlerMethodArgumentResolver{/** * 检查解析器是否支持解析改参数 */public boolean supportsParameter(MethodParameter parameter) {returnparameter.getParameterAnnotation(RequestAttribute.class) != null;}public Object resolveArgument(MethodParameter parameter,ModelAndViewContainer mavContainer, NativeWebRequest webRequest,WebDataBinderFactory binderFactory) throws Exception {// TODO Auto-generated method stub//if(parameter.getParameterType()!=null&&parameter.getParameterType().equals(UserInfo.class)){//HttpServletRequest request = webRequest.getNativeRequest(HttpServletRequest.class);//UserInfo userinfo = (UserInfo)request.getAttribute(Const.SESSION_USER);//return userinfo;//}else{//return "没有成功";//}RequestAttribute attr = parameter.getParameterAnnotation(RequestAttribute.class);return webRequest.getAttribute(attr.value(), WebRequest.SCOPE_REQUEST);}}最后需要在spring-mvc的配置文件中配置这个bean。把它交给容器管理。
为了更全面看。我把整个文件都拉出来了。<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"xmlns:mvc="http://www.springframework.org/schema/mvc"xmlns:aop="http://www.springframework.org/schema/aop"xmlns:tx="http://www.springframework.org/schema/tx"xmlns:util="http://www.springframework.org/schema/util"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans-4.1.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-4.1.xsdhttp://www.springframework.org/schema/mvchttp://www.springframework.org/schema/mvc/spring-mvc-4.1.xsdhttp://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop-4.1.xsdhttp://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.1.xsd http://www.springframework.org/schema/txhttp://www.springframework.org/schema/tx/spring-tx-4.1.xsd"><!-- 引入属性文件 --><bean id="propertyConfigure2" class="com.etoak.core.CustomizedPropertyConfigurer"><property name="fileEncoding" value="UTF-8" /><property name="locations"><list><value>classpath:jdbc.properties</value><value>classpath:config.properties</value></list></property></bean><!-- 配置扫描注册controller --><context:component-scan base-package="com.etoak.*"></context:component-scan> <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"><property name="synchronizeOnSession" value="true"></property><property name="messageConverters"><util:list id="beanList"><ref bean ="mappingJacksonHttpMessageConverter"/></util:list></property><!-- 自定义参数解析器 --> <property name="customArgumentResolvers"><list><!-- 支持@RequestAttribute注解参数的绑定 --><bean class="com.etoak.core.RequestAttributeMethodResolver"/></list></property></bean> <!-- 启动springMVC的注解功能,完成POJO扫描 --><mvc:annotation-driven /><!-- 上传文件 --><bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"><property name="defaultEncoding" value="utf-8" /><property name="maxInMemorySize"value="4096000" /><property name="maxUploadSize" value="10485760000"/></bean><!-- spring视图解析器 --><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="viewClass" value="org.springframework.web.servlet.view.JstlView" /><property name="prefix" value="/WEB-INF/pages/"></property><property name="suffix" value=".jsp"></property></bean><mvc:interceptors><mvc:interceptor><mvc:mapping path="/**"/><!-- 登录的URL不拦截 --><mvc:exclude-mapping path="/index.do"/><mvc:exclude-mapping path="/loginsubmit.do"/><bean class="com.etoak.Interceptor.LoginInterceptor"/></mvc:interceptor></mvc:interceptors><!-- 避免IE在ajax请求时,返回json出现下载 --><bean id="mappingJacksonHttpMessageConverter"class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"><!--先不配置,采用默认配置--><property name="supportedMediaTypes"><list><value>text/html;charset=UTF-8</value><value>application/json;charset=UTF-8</value></list></property> </bean><!-- 配置数据源 --><bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"><property name="driverClassName" value="${jdbc.driverClassName}" /><property name="url" value="${jdbc.url}" /> <property name="username" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> <property name="initialSize" value="2" /><property name="minIdle" value="1" /><property name="maxActive" value="20" /><!-- 配置获取连接的等待时间 --><property name="maxWait" value="30000"></property><!-- 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒 --><property name="timeBetweenEvictionRunsMillis" value="60000" /><!-- 配置一个连接在池中最小生存的时间,单位是毫秒 --><property name="minEvictableIdleTimeMillis" value="300000" /><property name="testWhileIdle" value="true" /><!-- 这里建议配置为TRUE,防止取到的连接不可用 --><property name="testOnBorrow" value="true" /><property name="testOnReturn" value="false" /><property name="proxyFilters"><list><ref bean="logFilter" /></list></property><property name="filters" value="log4J" /></bean><bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"><property name="dataSource" ref="dataSource" /><property name="mapperLocations"> <list><value>classpath:mybatis/*.xml</value><value>classpath:mybatis/cus/mysql/*.xml</value></list></property> </bean><!-- DAO接口所在包名,Spring会自动查找其下的类 --><bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"><property name="basePackage" value="com.etoak.dao" /><property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property></bean><bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate"><constructor-arg index="0" ref="sqlSessionFactory" /></bean><bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"><property name="dataSource" ref="dataSource" /></bean><bean id="logFilter" class="com.alibaba.druid.filter.logging.Log4jFilter"><property name="resultSetLogEnabled" value="true" /></bean><!-- 慢sql记录 --><bean id="statfilter" class="com.alibaba.druid.filter.stat.StatFilter"> <!-- 开启慢查询语句,1秒 --><property name="slowSqlMillis" value="1000" /><property name="logSlowSql" value="true" /></bean></beans>已经有注释了,相信应该能看懂。本文永久更新链接地址:http://www.linuxidc.com/Linux/2017-01/139676.htm