springmvc自定义参数绑定用户信息

来源：互联网发布：mysql 特殊字符入库编辑：程序博客网时间：2024/05/22 10:34

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) {        return  parameter.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/beans    http://www.springframework.org/schema/beans/spring-beans-4.1.xsd    http://www.springframework.org/schema/context    http://www.springframework.org/schema/context/spring-context-4.1.xsd    http://www.springframework.org/schema/mvc    http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd    http://www.springframework.org/schema/aop    http://www.springframework.org/schema/aop/spring-aop-4.1.xsd    http://www.springframework.org/schema/util     http://www.springframework.org/schema/util/spring-util-4.1.xsd     http://www.springframework.org/schema/tx    http://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。

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