Spring整合Servlet

第一步:在web.xml中注册Spring的监听器

这时我们在Web项目中添加Spring的第一步（当然肯定要添加Spring所需要的Jar包啦）

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1. <span style="font-size: 16px;"><?xml version="1.0" encoding="UTF-8"?>  
2. <web-app version="2.5"   
3.     xmlns="http://java.sun.com/xml/ns/javaee"   
4.     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   
5.     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee   
6.     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  
7.       
8.     <!-- Spring -->  
9.     <context-param>  
10.         <param-name>contextConfigLocation</param-name>  
11.         <param-value>  
12.             /WEB-INF/classes/applicationContext.xml  
13.         </param-value>  
14.     </context-param>  
15.     <listener>  
16.         <listener-class>  
17.             org.springframework.web.context.ContextLoaderListener  
18.         </listener-class>  
19.     </listener>  
20.    
21.   </servlet-mapping>  
22.       
23.    <welcome-file-list>  
24.      <welcome-file>index.jsp</welcome-file>  
25.    </welcome-file-list>  
26. </web-app></span>  

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"><!-- Spring --><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-mapping>   <welcome-file-list>     <welcome-file>index.jsp</welcome-file>   </welcome-file-list></web-app>

 

第二步:编写一个管理Servlet的类

这个类主要是将Servlet和Spring中的Bean结合起来,方便Spring对Servlet进行管理,起到一个中转的作用

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1. package com.xwl.estore.servlet;  
2.   
3. import java.io.IOException;  
4.   
5. import javax.servlet.GenericServlet;  
6. import javax.servlet.Servlet;  
7. import javax.servlet.ServletException;  
8. import javax.servlet.ServletRequest;  
9. import javax.servlet.ServletResponse;  
10.   
11. import org.springframework.web.context.WebApplicationContext;  
12. import org.springframework.web.context.support.WebApplicationContextUtils;  
13.   
14. @SuppressWarnings("serial")  
15. /** 
16.  * 我们自己实现的一个代理类用于将Servlet转为Spring管理的Servlet Bean 
17.  */  
18. public class ServletToBeanProxy extends GenericServlet {  
19.   
20.     private String targetBean;//当前客户端请求的Servlet名字  
21.     private Servlet proxy;//代理Servlet  
22.       
23.     @Override  
24.     public void init() throws ServletException {  
25.         super.init();  
26.         WebApplicationContext wac =   
27.             WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext()); //初始化Spring容器  
28.         this.targetBean = getServletName();  
29.         this.proxy = (Servlet) wac.getBean(targetBean);//调用ServletBean  
30.         proxy.init(getServletConfig());//调用初始化方法将ServletConfig传给Bean  
31.     }  
32.   
33.     @Override  
34.     public void service(ServletRequest arg0, ServletResponse arg1)  
35.             throws ServletException, IOException {  
36.         proxy.service(arg0, arg1);//在service方法中调用bean的service方法，servlet会根据客户的请求去调用相应的请求方法（Get/Post）  
37.     }  
38. }  

package com.xwl.estore.servlet;import java.io.IOException;import javax.servlet.GenericServlet;import javax.servlet.Servlet;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import org.springframework.web.context.WebApplicationContext;import org.springframework.web.context.support.WebApplicationContextUtils;@SuppressWarnings("serial")/** * 我们自己实现的一个代理类用于将Servlet转为Spring管理的Servlet Bean */public class ServletToBeanProxy extends GenericServlet {private String targetBean;//当前客户端请求的Servlet名字    private Servlet proxy;//代理Servlet@Overridepublic void init() throws ServletException {super.init();WebApplicationContext wac = WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext()); //初始化Spring容器        this.targetBean = getServletName();        this.proxy = (Servlet) wac.getBean(targetBean);//调用ServletBean        proxy.init(getServletConfig());//调用初始化方法将ServletConfig传给Bean}@Overridepublic void service(ServletRequest arg0, ServletResponse arg1)throws ServletException, IOException {proxy.service(arg0, arg1);//在service方法中调用bean的service方法，servlet会根据客户的请求去调用相应的请求方法（Get/Post）}}

 

第二步:在web.xml中注册Servlet

注意这里的Servlet是有规范的一定要遵循

 1、<servlet-name>的名字必须是Spring容器中ServletBean的id

 2、<servlet-class>必须是上面写的代理类的全路径com.xwl.estore.servlet.ServletToBeanProxy

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1. <?xml version="1.0" encoding="UTF-8"?>  
2. <web-app version="2.5"   
3.     xmlns="http://java.sun.com/xml/ns/javaee"   
4.     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   
5.     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee   
6.     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  
7.       
8.     <!-- Spring -->  
9.     <context-param>  
10.         <param-name>contextConfigLocation</param-name>  
11.         <param-value>  
12.             /WEB-INF/classes/applicationContext.xml  
13.         </param-value>  
14.     </context-param>  
15.     <listener>  
16.         <listener-class>  
17.             org.springframework.web.context.ContextLoaderListener  
18.         </listener-class>  
19.     </listener>  
20.       
21.     <!-- Servlet -->  
22.   <servlet>  
23.     <servlet-name>helloServlet</servlet-name>  
24.     <servlet-class>com.xwl.estore.servlet.ServletToBeanProxy</servlet-class>  
25.   </servlet>  
26.   
27.   <servlet-mapping>  
28.     <servlet-name>helloServlet</servlet-name>  
29.     <url-pattern>/HelloServlet</url-pattern>  
30.   </servlet-mapping>  
31.       
32.    <welcome-file-list>  
33.      <welcome-file>index.jsp</welcome-file>  
34.    </welcome-file-list>  
35. </web-app>  

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"><!-- Spring --><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>    <servlet-name>helloServlet</servlet-name>    <servlet-class>com.xwl.estore.servlet.ServletToBeanProxy</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>helloServlet</servlet-name>    <url-pattern>/HelloServlet</url-pattern>  </servlet-mapping>   <welcome-file-list>     <welcome-file>index.jsp</welcome-file>   </welcome-file-list></web-app>

 

第三步:编写ServletBean（这也是一个Servlet要继承HttpServlet）

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1. package com.xwl.estore.servlet;  
2.   
3. import java.io.IOException;  
4. import java.io.PrintWriter;  
5.   
6. import javax.annotation.Resource;  
7. import javax.servlet.ServletException;  
8. import javax.servlet.http.HttpServlet;  
9. import javax.servlet.http.HttpServletRequest;  
10. import javax.servlet.http.HttpServletResponse;  
11.   
12. import org.springframework.context.annotation.Scope;  
13. import org.springframework.stereotype.Controller;  
14.   
15. import com.xwl.estore.service.UserService;  
16.   
17. @SuppressWarnings("serial")  
18. @Controller  
19. @Scope("prototype")  
20. public class HelloServlet extends HttpServlet {  
21.   
22.     private UserService userService;  
23.       
24.     @Resource  
25.     public void setUserService(UserService userService) {  
26.         this.userService = userService;  
27.     }  
28.   
29.     public void doGet(HttpServletRequest request, HttpServletResponse response)  
30.             throws ServletException, IOException {  
31.         System.out.println("Get");  
32.         PrintWriter out = response.getWriter();  
33.         out.println(userService.sayHello("Hello,Spring.Servlet"));    
34.     }  
35.   
36.     public void doPost(HttpServletRequest request, HttpServletResponse response)  
37.             throws ServletException, IOException {  
38.         System.out.println("Post");  
39.         PrintWriter out = response.getWriter();  
40.         out.println(userService.sayHello("Hello,Spring.Servlet"));        
41.     }  
42.   
43. }  

package com.xwl.estore.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.annotation.Resource;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.context.annotation.Scope;import org.springframework.stereotype.Controller;import com.xwl.estore.service.UserService;@SuppressWarnings("serial")@Controller@Scope("prototype")public class HelloServlet extends HttpServlet {private UserService userService;@Resourcepublic void setUserService(UserService userService) {this.userService = userService;}public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {System.out.println("Get");PrintWriter out = response.getWriter();        out.println(userService.sayHello("Hello,Spring.Servlet"));}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {System.out.println("Post");PrintWriter out = response.getWriter();        out.println(userService.sayHello("Hello,Spring.Servlet"));}}

 

第四步:编写Spring配置文件（applicationContext.xml）

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1. <span style="font-size: 16px;">这里我用的是annotation的方式</span>  

这里我用的是annotation的方式

 

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1. <span style="font-size: 16px;"><?xml version="1.0" encoding="UTF-8"?>  
2. <beans xmlns="http://www.springframework.org/schema/beans"  
3.     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"  
4.     xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"  
5.     xmlns:tx="http://www.springframework.org/schema/tx"  
6.     xsi:schemaLocation="  
7.     http://www.springframework.org/schema/beans   
8.     http://www.springframework.org/schema/beans/spring-beans-2.5.xsd  
9.     http://www.springframework.org/schema/context   
10.     http://www.springframework.org/schema/context/spring-context-2.5.xsd  
11.     http://www.springframework.org/schema/tx   
12.     http://www.springframework.org/schema/tx/spring-tx-2.5.xsd  
13.     http://www.springframework.org/schema/aop   
14.     http://www.springframework.org/schema/aop/spring-aop-2.5.xsd     
15.     ">  
16.    <context:annotation-config></context:annotation-config>  
17.    <context:component-scan base-package="com.xwl.estore"></context:component-scan>  
18.   
19. </beans></span>  

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"xmlns:tx="http://www.springframework.org/schema/tx"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsdhttp://www.springframework.org/schema/context     http://www.springframework.org/schema/context/spring-context-2.5.xsd    http://www.springframework.org/schema/tx     http://www.springframework.org/schema/tx/spring-tx-2.5.xsd    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd   ">   <context:annotation-config></context:annotation-config>   <context:component-scan base-package="com.xwl.estore"></context:component-scan></beans>

第五步:进行测试

为了测试我编写了一个Service类（一个接口和一个实现）

下面是Service接口

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1. package com.xwl.estore.service;  
2.   
3. public interface UserService {  
4.   
5.     public String sayHello(String hello);  
6. }  

package com.xwl.estore.service;public interface UserService {public String sayHello(String hello);}

下面是Service接口的实现

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1. package com.xwl.estore.service.impl;  
2.   
3. import org.springframework.stereotype.Service;  
4.   
5. import com.xwl.estore.service.UserService;  
6.   
7. @Service  
8. public class UserServiceImpl implements UserService {  
9.   
10.     public String sayHello(String hello) {  
11.         return hello;  
12.     }  
13. }  

package com.xwl.estore.service.impl;import org.springframework.stereotype.Service;import com.xwl.estore.service.UserService;@Servicepublic class UserServiceImpl implements UserService {public String sayHello(String hello) {return hello;}}

在浏览器中输入Url http://localhost:8080/EStore/HelloServlet 进行访问结果如下:

Hello,Spring.Servlet

 

 转载码龙008博客http://blog.csdn.net/xwl617756974/article/details/7451773