Spring治理filter和servlet，无硬编码bean

Spring管理filter和servlet，无硬编码bean

?????? <propertyname="siteSpecialTestDao"ref="jczc.siteSpecialTestDao"/>

</bean>

说明：com.jsptpd.jczc.temp.GongGuanTest继承自javax.servlet.http.HttpServlet,如下：

package com.jsptpd.jczc.temp;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

importjavax.servlet.http.HttpServletRequest;

importjavax.servlet.http.HttpServletResponse;

import com.jsptpd.jczc.signal.dao.impl.SiteSpecialTestDaoImpl;

public class GongGuanTest extendsHttpServlet {

?????? privatestatic final long serialVersionUID = 1L;

?????? privateString name;

?????? privateSiteSpecialTestDaoImpl siteSpecialTestDao;

?????? publicSiteSpecialTestDaoImpl getSiteSpecialTestDao() {

????????????? returnsiteSpecialTestDao;

?????? }

?????? publicvoid setSiteSpecialTestDao(SiteSpecialTestDaoImpl siteSpecialTestDao) {

????????????? this.siteSpecialTestDao= siteSpecialTestDao;

?????? }

?????? publicString getName() {

????????????? returnname;

?????? }

?????? publicvoid setName(String name) {

????????????? this.name= name;

?????? }

?????? protectedvoid doGet(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {

????????????? doPost(request,response);

?????? }

?????? protectedvoid doPost(HttpServletRequest request, HttpServletResponse response) throwsServletException, IOException {

????????????? response.setContentType("text/html;charset=utf-8");

????????????? PrintWriterout = response.getWriter();

????????????? out.println("<!DOCTYPEHTML PUBLIC \"-//W3C//DTD HTML 4.01Transitional//EN\">");

????????????? out.println("<HTML>");

????????????? out.println("? <HEAD><TITLE>AServlet</TITLE></HEAD>");

????????????? out.println("? <BODY>");

????????????? request.setCharacterEncoding("utf-8");

?????? ??? out.println(name.toString() +"<br>");

????????????? out.println(siteSpecialTestDao.toString()+ "<br>");

????????????? out.println("? </BODY>");

????????????? out.println("</HTML>");

????????????? out.flush();

????????????? out.close();

?????? }

}

2.实现servlet代理，创建一个servlet代理十分简单，一个具体的实现如下：

package com.jsptpd.jczc.temp.proxy;

import java.io.IOException;

import javax.servlet.GenericServlet;

import javax.servlet.Servlet;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

importorg.springframework.web.context.WebApplicationContext;

importorg.springframework.web.context.support.WebApplicationContextUtils;

public class ServletToBeanProxy extendsGenericServlet {

???private String targetBean;

???private Servlet proxy;

???public void init() throws ServletException {

???????this.targetBean = getInitParameter("targetBean");

???????getServletBean();

???????proxy.init(getServletConfig());

??? }

???public void service(ServletRequest req, ServletResponse res)

???????????throws ServletException, IOException {

???????proxy.service(req, res);

??? }

???private void getServletBean() {

???????//实现一个servlet代理,该代理用WebApplicationContext来获得在applicationContext.xml中定义的servlet的对象，并将任务委托给applicationContext.xml中定义的servlet；

???????WebApplicationContext wac =WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext());

???????this.proxy = (Servlet) wac.getBean(targetBean);

??? }

}

说明：相信看了代码就明白了，它利用targetBean属性在spring中查找相应的servlet，这很像FilterToBeanProxy的方式，所以我为其取名为ServletToBeanProxy。当然，我们也可以使用类似于DelegatingFilterProxy的方式，只需要将上述代码中this.targetBean= getInitParameter("targetBean");修改为this.targetBean=this.getServletName();即可，我们相应的命名为DelegatingServletProxy。

3.配置web.xml

初始化spring的context，与filter中的说明一致。

<context-param>

????????????? <param-name>contextConfigLocation</param-name>

????????????? <param-value>

???????????????????? /WEB-INF/spring-configs/base/applicationContext.xml

????????????? </param-value>

</context-param>

???????<listener-class>

???????????org.springframework.web.context.ContextLoaderListener

???????</listener-class>

</listener>

4.Servlet配置：

ServletToBeanProxy代理的配置

???????<servlet-name>springServlet</servlet-name>

???????<servlet-class>

?????????????????com.jsptpd.jczc.temp.proxy.ServletToBeanProxy

???????</servlet-class>

???????<init-param>

???????????<param-name>targetBean</param-name>

???????????<param-value>springServlet</param-value>

???????</init-param>

</servlet>

<servlet-mapping>

????????????? <servlet-name> springServlet </servlet-name>

????????????? <url-pattern>/gongguantest.htc</url-pattern>

</servlet-mapping>

DelegatingServletProxy代理的配置

???????<servlet-name>springServlet</servlet-name>

???????<servlet-class>

???????????com.jsptpd.jczc.temp.proxy.DelegatingServletProxy

???????</servlet-class>

</servlet>

<servlet-mapping>

????????????? <servlet-name> springServlet </servlet-name>

????????????? <url-pattern>/gongguantest.htc</url-pattern>

</servlet-mapping>

OK!servlet的配置完成。推荐使用DelegatingServletProxy,配置上更简单。

Spring治理filter和servlet无硬编码

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