SpringMVC自定义参数绑定用户信息

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)
@Documented
public @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。

SpringMVC自定义参数绑定用户信息

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