strtus1.X 与 spring 2.X的三种整合方式-优快云博客

本文介绍了三种Struts与Spring框架整合的方式：使用DelegatingRequestProcessor代理请求处理过程；全权委托给Spring进行Action创建及依赖注入；利用Spring的ActionSupport简化整合流程。每种方式均附带详细的配置说明及代码示例。

1,使用Spring 的 DelegatingRequestProcessor 类
DelegatingRequestProcessor 继承自 org.apache.struts.action.RequestProcessor 并覆盖了里面的方法。
sturts-config.xml 中 <controller processorClass="org.springframework.web.struts.DelegatingRequestProcessor"/> 通过 <controller >来替代
org.apache.struts.action.RequestProcessor 的请求处理。

public class LoginAction extends Action {

	@Override
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		LoginForm formbean = (LoginForm)form;
		String name = formbean.getName().trim();
		String password = formbean.getPassword().trim();
		if("lmning".equals(name)&&"1234".equals(password)){
			User user = new User();
			user.setName(name);
			user.setPassword(password);
			request.setAttribute("user", user);
			return mapping.findForward("success");
		}else return mapping.findForward("failure");
	}
}

public class User {
	
	private String name;
	private String password;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
}

public class LoginForm extends ActionForm {

	private static final long serialVersionUID = 7419866036877000754L;
	private String name;
	private String password;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}

}

配置文件：

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.5" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee   http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  
  <context-param>
  <param-name>contextConfigLocation</param-name>
  <param-value>/WEB-INF/classes/applicationContext.xml</param-value>
  </context-param>
  
  <listener>
  <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  
  <servlet>
		<servlet-name>struts</servlet-name>
		<servlet-class>
			org.apache.struts.action.ActionServlet
		</servlet-class>
		<init-param>
			<param-name>config</param-name>
			<param-value>/WEB-INF/struts-config.xml</param-value>
		</init-param>
		<init-param>
			<param-name>debug</param-name>
			<param-value>3</param-value>
		</init-param>
		<init-param>
			<param-name>detail</param-name>
			<param-value>3</param-value>
		</init-param>
		<load-on-startup>0</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>struts</servlet-name>
		<url-pattern>*.do</url-pattern>
	</servlet-mapping>
  
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

struts-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN" "http://struts.apache.org/dtds/struts-config_1_3.dtd">

<struts-config>
  <form-beans>
  <form-bean name="loginForm" type="com.lmning.form.LoginForm"></form-bean>
  </form-beans>
  
  <global-exceptions />
  <global-forwards />
  
  <action-mappings>
  <action path="/login" name="loginForm" scope="request">
  <forward name="success" path="/success.jsp"></forward>
  <forward name="failure" path="/failure.jsp"></forward>
  </action>
  </action-mappings>
  
<!-- 把action交给spring处理 -->
	<controller>
	  <set-property property="processorClass" value="org.springframework.web.struts.DelegatingRequestProcessor"/>
	</controller> 
  
  <message-resources parameter="com.lmning.struts.ApplicationResources" />
</struts-config>

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

	<bean name="/login" class="com.lmning.LoginAction">
	</bean>
</beans>

I LOVE THIS ONE!

缺点：

RequestProcessor类已经被代理如果要再实现自己的实现方式（如：编码处理）麻烦。

还必须依赖Struts的RequestProcessor类。

2，全权委托：
Action 的创建和对象的依赖注入全部由IOC容器来完成。使用Spring的DelegatingAcionProxy来帮助实现代理的工作
org.springframework.web.struts.DelegatingActiongProxy继承于org.apache.struts.action.Action .

这种方式只需要改Struts-config.xml:

  <action path="/login" name="loginForm" scope="request"
   type="org.springframework.web.struts.DelegatingActionProxy">
  <forward name="success" path="/success.jsp"></forward>
  <forward name="failure" path="/failure.jsp"></forward>
  </action>

与第一中方式相比：
 <action>中 type指向的是spring 的代理类
 去掉struts-config.xml中 <controller >

缺点：

type="org.springframework.web.struts.DelegatingActionProxy">
看上去都一样，而不是具体的类名

这种方式最灵活

3，最简单的整合方式：

使用Spring的ActionSupport .
Spring 的ActionSupport 继承至 org.apache.struts.action.Action
ActionSupport的子类可以或得 WebApplicationContext类型的全局变量。通过getWebApplicationContext()可以获得这个变量

  <action-mappings>
  <action path="/login" name="loginForm" scope="request"
   type="com.lmning.LoginAction">
  <forward name="success" path="/success.jsp"></forward>
  <forward name="failure" path="/failure.jsp"></forward>
  </action>
  </action-mappings>

在Action中获取Spring的ApplicationContext

例如：

WebApplicationContext ctx = this.getWebApplicationContext();

LoginDao dao = (LoginDao) ctx.getBean("loginDao");

用的少，因为

缺点：一，Struts与Spring紧密耦合，不能改换到其他IoC容器；

二，难以使用Spring AOP特性；

三，对于需要使用DispatchAction的Struts应用无能为力。