Spring MultiAction的简单示例

　　简单介绍我自己写的MethodNameResolver和UrlHandlerMapping

　　PathMethodNameResolver，根据url取得调用MultiAction的方法名称，比如/user/userAdd.action，就可以调用到id为user的类的userAdd的方法来处理action

package com.zgc.test.multiaction;
import javax.servlet.http.HttpServletRequest;
import org.springframework.web.servlet.mvc.multiaction.MethodNameResolver;
import org.springframework.web.servlet.mvc.multiaction.NoSuchRequestHandlingMethodException;
public class PathMethodNameResolver implements MethodNameResolver {
 public String getHandlerMethodName(HttpServletRequest request)
   throws NoSuchRequestHandlingMethodException {
  String uri=request.getRequestURI();
  int begin = uri.lastIndexOf(’/’);
  if (begin == -1) {
   begin = 0;
  }
  else {
   begin++;
  }
  int end;
  if (uri.indexOf(";") != -1) {
   end = uri.indexOf(";");
  }
  else if (uri.indexOf("?") != -1) {
   end = uri.indexOf("?");
  }
  else {
   end = uri.length();
  }
  String fileName = uri.substring(begin, end);
  if (fileName.indexOf(".") != -1) {
   fileName = fileName.substring(0, fileName.lastIndexOf("."));
  }
  return fileName;
 }
}

　　DynamicUrlHandlerMapping，考虑到有的时候有特殊需求，所以就最后一个来指定方法，前面的来构成beanname，如/admin/user/viewUser.action，就可以查找到adminUser这个id的类，然后调用viewUser这个方法。用到了lazy load而不是一开始就把所有的bean都放到工厂，有利于服务的启动速度（最近老是觉得这个烦），也可以不实例化一辈子都用不到的类（这种类可以删除了）

package com.zgc.test.multiaction;
import org.apache.commons.lang.StringUtils;
import org.springframework.web.servlet.handler.AbstractUrlHandlerMapping;
public class DynamicUrlHandlerMapping extends AbstractUrlHandlerMapping {
 protected Object lookupHandler(String urlPath) {
  Object handler = super.lookupHandler(urlPath);
  if (handler == null) {
   String[] paths=urlPath.split("/");
   String beanName="";
   for(int i=0;i<paths.length-1;i++){
    beanName+=StringUtils.capitalize( paths[i]);
   }
   registerHandler(urlPath,StringUtils.uncapitalize(beanName));
   handler=super.lookupHandler(urlPath);
  }
  return handler;
 }
}

　　用到了一个简单的方法去viewName，我喜欢约定多于配置，于是有这么一个helper类

package com.zgc.test.multiaction;
public class MethodNameViewName {
 public static String getViewName(){
  StackTraceElement[] elements = (new Throwable()).getStackTrace();
  return elements[1].getMethodName();
 }
}

 

　　再接着就是实现类了，很简单，示例吗

package com.zgc.test.multiaction;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;
public class ChannelManager extends MultiActionController {
 public ModelAndView channelList(HttpServletRequest request,HttpServletResponse response){
  return new ModelAndView(MethodNameViewName.getViewName(),"message","channelList");
 }
 public ModelAndView channelAdd(HttpServletRequest request,HttpServletResponse response){
  return new ModelAndView(MethodNameViewName.getViewName(),"message","channelAdd");
 }
}

　　还有就是配置文件，因为autowire了，变得很简单

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
 "http://www.springframework.org/dtd/spring-beans.dtd">
<beans default-autowire="byName" default-lazy-init="false"
 default-dependency-check="none">
 <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
  <property name="prefix"><value>/WEB-INF/view/</value></property>
  <property name="suffix"><value>.jsp</value></property>
 </bean>
 <bean id="handlerMapping" class="com.zgc.test.multiaction.DynamicUrlHandlerMapping">
 </bean>
 <bean id="methodNameResolver" class="com.zgc.test.multiaction.PathMethodNameResolver"/>
 <bean id="user" class="com.zgc.test.multiaction.UserManager">
 </bean>
 <bean id="channel" class="com.zgc.test.multiaction.ChannelManager">
 </bean>
</beans>

jsp很简单就是标识一下不同的页面，就不做展示了。启动之后就可以通过http://server:port/beanname/methodName.action,来访问了

查看本文来源