在實際開發中我們需要用到Spring和Servlet這樣的組合（比如寫一個小項目啥的）下面我來整理一下我我的整合:第一步:在web.xml中註冊Spring的監聽器
這時我們在Web項目中添加Spring的第一步（當然肯定要添加Spring所需要的Jar包啦）
<?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:編寫一個管理Servlet的類
這個類主要是將Servlet和Spring中的Bean結合起來,方便Spring對Servlet進行管理,起到一箇中轉的作用
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")
/**
* 我們自己實現的一個代理類用於將Servlet轉爲Spring管理的Servlet Bean
*/
public class ServletToBeanProxy extends GenericServlet {
private String targetBean;//當前客戶端請求的Servlet名字
private Servlet proxy;//代理Servlet
@Override
public 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);//調用ServletBean
proxy.init(getServletConfig());//調用初始化方法將ServletConfig傳給Bean
}
@Override
public void service(ServletRequest arg0, ServletResponse arg1)
throws ServletException, IOException {
proxy.service(arg0, arg1);//在service方法中調用bean的service方法，servlet會根據客戶的請求去調用相應的請求方法（Get/Post）
}
}第二步:在web.xml中註冊Servlet
注意這裏的Servlet是有規範的一定要遵循
1、<servlet-name>的名字必須是Spring容器中ServletBean的id
2、<servlet-class>必須是上面寫的代理類的全路徑com.xwl.estore.servlet.ServletToBeanProxy
<?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:編寫ServletBean（這也是一個Servlet要繼承HttpServlet）
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;
@Resource
public 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:編寫Spring配置文件（applicationContext.xml）
這裏我用的是annotation的方式<?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.xsd
http://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>爲了測試我編寫了一個Service類（一個接口和一個實現）
下面是Service接口
package com.xwl.estore.service;
public interface UserService {
public String sayHello(String hello);
}
package com.xwl.estore.service.impl;
import org.springframework.stereotype.Service;
import com.xwl.estore.service.UserService;
@Service
public class UserServiceImpl implements UserService {
public String sayHello(String hello) {
return hello;
}
}
Hello,Spring.Servlet
說明:Spring整合了Servlet之後我們就可以整合Hibernate，JDBC，和事務管理等，這裏只是搭建搭建一個HelloWorld。