在利用spring的mvc開發過程中，需要將User對象從session中取出來使用。參照網上的做法，我利用了AnnotationMethodHandlerAdapter來解決這個問題。下面是XML代碼，放到web-inf下面的springMVC配置文件中：
<bean id="userArgumentResolver" class="com.greatwall.module.yhqxgl.interceptor.UserArgumentResolver" />
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" >
<property name="customArgumentResolver">
<ref bean="userArgumentResolver"/>
</property>
</bean>
下面是java代碼：
package com.greatwall.module.yhqxgl.interceptor;
import org.springframework.core.MethodParameter;
import org.springframework.web.bind.support.WebArgumentResolver;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.context.request.RequestAttributes;
import com.greatwall.module.yhqxgl.YhqxglConstants;
import com.greatwall.module.yhqxgl.domain.User;
public class UserArgumentResolver implements WebArgumentResolver {
public Object resolveArgument(MethodParameter methodParameter, NativeWebRequest webRequest) throws Exception {
if (methodParameter.getParameterType().equals(User.class)) {
return webRequest.getAttribute(YhqxglConstants.GREATWALL_SESSION_USER, RequestAttributes.SCOPE_SESSION);
}
return UNRESOLVED;
}
}
調用的過程很簡單，直接在controller對應的函數里面加入參數User即可。
@RequestMapping("/txn960204.do")
public void txn960204(HttpServletResponse response, HttpServletRequest req,SysCodedata sysCodedata,User user) {
try {
sysCodedata.setUpdateTime(DateUtils.currentDateTime());
sysCodedata.setUpdateUsername(user.getUsername());
sysCodedataService.updateOneSysCodedata(sysCodedata);
JsonUtils.success("修改保存代碼明細表成功！", response);
} catch (ServiceException e) {
e.printStackTrace();
JsonUtils.error(e, response);
}
}