Spring之Spring2.5集成Struts2.2

周一Monday

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Spring

struts spring web

1.搭建开发环境

Spring2.5需要的JAR文件：

spring-framework-2.5.6\dist\spring.jar

spring-framework-2.5.6\lib\jakarta-commons\commons-logging.jar

Struts2.2需要的JAR文件

struts-2.2.1.1\lib\commons-fileupload-1.2.1.jar

struts-2.2.1.1\lib\commons-io-1.3.2.jar

struts-2.2.1.1\lib\freemarker-2.3.16.jar

struts-2.2.1.1\lib\javassist-3.7.ga.jar

struts-2.2.1.1\lib\ognl-3.0.jar

struts-2.2.1.1\lib\struts2-core-2.2.1.1.jar

struts-2.2.1.1\lib\xwork-core-2.2.1.1.jar

struts-2.2.1.1\lib\struts2-spring-plugin-2.2.1.1.jar Spring整合Struts2需要的

在web.xml中做如下配：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
	id="WebApp_ID" version="2.5">

	<!-- 配置Spring监听器 -->
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:beans.xml</param-value>
	</context-param>

	<!-- 配置Struts2 -->
	<filter>
		<filter-name>struts2</filter-name>
		<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>struts2</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
</web-app>

JSP页面如下：

<%@ page language="java" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>Source City</title>
</head>
<body>
	<s:form action="distanceAction" method="post">
		<table>
			<tr>
				<td>Source City</td>
				<td><s:textfield name="srcCity" /></td>
			</tr>
			<tr>
				<td>Destination City</td>
				<td><s:textfield name="destCity" /></td>
			</tr>
			<tr>
				<td>Distance</td>
				<td><font color="red">${distance }</font></td>
			</tr>
			<tr>
				<td colspan="2"><s:submit value="Find" /></td>
			</tr>
		</table>
	</s:form>
</body>
</html>

2.开发Service

a.Service接口

package com.apress.springrecipes.city;

public interface CityService {

	/**
	 * 计算两个城市的距离
	 * @param srcCity 出发地
	 * @param destCity 目的地
	 * @return 两个城市之间的距离
	 */
	public double findDistance(String srcCity,String destCity);
}

b.开发Service的实现类

package com.apress.springrecipes.city;

import java.util.Map;

public class CityServiceImpl implements CityService {

	private Map<String, Map<String, Double>> distanceMap;

	public void setDistanceMap(Map<String, Map<String, Double>> distanceMap) {
		this.distanceMap = distanceMap;
	}

	/**
	 * 计算两个城市的距离
	 * @param srcCity 出发地
	 * @param destCity 目的地
	 * @return 两个城市之间的距离
	 */
	@Override
	public double findDistance(String srcCity, String destCity) {
		Map<String, Double> destinationMap = distanceMap.get(srcCity);
		if (destinationMap == null) {
			throw new IllegalArgumentException("Source city not found");
		}
		Double distance = destinationMap.get(destCity);
		if (distance == null) {
			throw new IllegalArgumentException("Destination city not found");
		}
		return distance;
	}

}

在Spring的配置文件beans.xml中配置service

<?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.xsd">

	<bean id="cityService" class="com.apress.springrecipes.city.CityServiceImpl">
		<property name="distanceMap">
			<map>
				<entry key="New York">
					<map>
						<entry key="London" value="5574" />
						<entry key="BeiJing" value="10974" />
					</map>
				</entry>
			</map>
		</property>
	</bean>
</beans>

3.开发Action整合Spring

有两种方法：

第一种：

package com.apress.springrecipes.city.struts2;

import javax.servlet.ServletContext;

import org.apache.struts2.ServletActionContext;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import com.apress.springrecipes.city.CityService;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class DistanceAction extends ActionSupport {

	private static final long serialVersionUID = 6770573934287194873L;

	private String srcCity;
	private String destCity;

	public String getSrcCity() {
		return srcCity;
	}

	public void setSrcCity(String srcCity) {
		this.srcCity = srcCity;
	}

	public String getDestCity() {
		return destCity;
	}

	public void setDestCity(String destCity) {
		this.destCity = destCity;
	}

	@Override
	public String execute() throws Exception {
		//获取ServletContext对象
		ServletContext servletContext = ServletActionContext.getServletContext();
		/**
		 * 在Web容器中获取Spring容器
		 * 此方法需要一个ServletContext对象
		 */
		WebApplicationContext ctx = WebApplicationContextUtils.getWebApplicationContext(servletContext);
		//取得Service对象
		CityService cityService = (CityService) ctx.getBean("cityService");
		//调用Service
		double distance = cityService.findDistance(srcCity, destCity);
		//存值
		ActionContext.getContext().put("distance", distance);
		return SUCCESS;
	}

}

struts.xml

<struts>
	<constant name="struts.devMode" value="true" />
	<constant name="struts.ui.theme" value="simple" />
	<package name="default" namespace="" extends="struts-default">
		<action name="distanceAction" class="com.apress.springrecipes.city.struts2.DistanceAction">
			<result name="success">/distance.jsp</result>
		</action>
	</package>
</struts>

这种方法Struts2并没有托管给Spring管理，只是在Action中通过Spring的容器获取Service而已。两者还是相对独立的。觉得还不算Struts与Spring集成吧，或者集成的不彻底吧。（哈，一家之言，欢迎拍转）。

第二种方法：

package com.apress.springrecipes.city.struts2;

import com.apress.springrecipes.city.CityService;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class DistanceAction2 extends ActionSupport {

	private static final long serialVersionUID = 6770573934287194873L;

	//注入Service
	private CityService cityService;

	public void setCityService(CityService cityService) {
		this.cityService = cityService;
	}

	private String srcCity;
	private String destCity;

	public String getSrcCity() {
		return srcCity;
	}

	public void setSrcCity(String srcCity) {
		this.srcCity = srcCity;
	}

	public String getDestCity() {
		return destCity;
	}

	public void setDestCity(String destCity) {
		this.destCity = destCity;
	}

	@Override
	public String execute() throws Exception {
		double distance = cityService.findDistance(srcCity, destCity);
		// 存值
		ActionContext.getContext().put("distance", distance);
		return SUCCESS;
	}

}

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN"
	"http://struts.apache.org/dtds/struts-2.1.7.dtd">

<struts>
	<constant name="struts.devMode" value="true" />
	<constant name="struts.ui.theme" value="simple" />
	<package name="default" namespace="" extends="struts-default">
		<!-- 
			这里的class="distanceAction2"只是一个“伪类”
			真正的实现类在Spring的beans.xml中定义
		 -->
		<action name="distanceAction2" class="distanceAction2">
			<result name="success">/distance2.jsp</result>
		</action>
	</package>
</struts>

然后，beans.xml中要加入如下配置：

<!-- 第二种方法 -->
	<!-- 
		配置scope="prototype" (推荐) 或者 scope="request" 
		以保证每次请求都创建一个新的Action实例
	 -->
	<bean id="distanceAction2" class="com.apress.springrecipes.city.struts2.DistanceAction2" scope="prototype">
		<property name="cityService" ref="cityService" />
	</bean>

这次Action的实例由Spring创建管理，而需要的Service组件，则需要提供Service的Setter方法来注入进去来得到Service，即：所有的组件都在Spring中注册了，通通交由Spring管理了。

spring_11_struts2.rar (5.6 MB)
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2011-12-06 19:02
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