本文主要是介绍java结合wabacus实现session共享(第二版),希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
声明:该版相对于第一版有所改进。原因:每一版存在session覆盖问题,分析如下:
request().getServletContext().setAttribute("globelSession", session);
我们可以把globelSession想象成是索引,或某一搜索条件。每一次请求都搜索名为globelSession的session,而globelSession是指定的,每一次set的session都名为globelSession,所以session将会被更新,即:覆盖。
解决办法:浏览器每一次请求所产生的sessionid都不重复,因此,我们可以将这个sessionid想象成主键ID或索引,ID不重复,查询出来的数据也不会是同一条,因此能够有效地避免session覆盖。代码如下:
HttpSession session = request().getSession();
request().getServletContext().setAttribute(session.getId(), session);
一、完整代码:
System.out.println("==============================启用SESSION共享(跨域)===============================");
HttpSession session = request().getSession();
session.setAttribute("userPA01", user.getPA01());
session.setAttribute("userName", user.getUserName());
// 注意这里,要传递sessionID过去,目的:避免session覆盖
request().getServletContext().setAttribute(session.getId(), session);
//request().getServletContext().setAttribute("globelSession", session);
/*Cookie[] cookies = request().getCookies();
for (Cookie cookie : cookies) {
System.out.println("登录时cookies:"+cookie.getValue());
}*/
System.out.println("================================"+session.getId()+"==============================");
在另一个工程下新建servlet测试类Global.java
protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {ServletContext context = request.getServletContext().getContext("/app2");HttpSession session = (HttpSession) context.getAttribute(session.getId());System.out.println("跨域获取到的" + session.getAttribute("userPA01"));
}
此时,需要修改web.xml文件,即:请求的入口
<!-- session跨域、共享(测试用) -->
<!-- <servlet><description>This is the description of my J2EE component</description><display-name>This is the display name of my J2EE component</display-name><servlet-name>Global</servlet-name><servlet-class>com.perfect.util.Global</servlet-class>
</servlet>
<servlet-mapping><servlet-name>Global</servlet-name><url-pattern>/*</url-pattern>
</servlet-mapping> -->
server.xml配置:
<Context docBase="D:\WorkSpace\WabacusBlank\WebRoot" path="/OA" reloadable="true" crossContext="true" sessionCookiePath="/"/>
<Context docBase="D:\WorkSpace\PerfectOA\target\oa" path="/" reloadable="true" crossContext="true" sessionCookiePath="/"/>
当你启动app1工程并登录后,运行app2即可获取app1共享的session。
二、在wabacus中的用法,必须遵循wabacus的语法
首先,在wabacus.cfg.xml中配置全局拦截器,代码如下:
<!-- 配置全局拦截器 -->
<global-interceptors><interceptor class="com.perfect.interceptor.DataSessionIntercetor"/>
</global-interceptors>
创建拦截器DataSessionIntercetor.java
package com.perfect.interceptor;import javax.servlet.ServletContext;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;import com.wabacus.system.ReportRequest;
import com.wabacus.system.intercept.AbsPageInterceptor;public class DataSessionIntercetor extends AbsPageInterceptor {public void doStart(ReportRequest rrequest) {System.out.println("您进入拦截器!");System.out.println("++++++++++++++++++获取共享session信息如下:++++++++++++++++++");ServletContext context = rrequest.getRequest().getServletContext().getContext("/");
// HttpSession session = (HttpSession) context.getAttribute("globelSession");String wabSessionID = rrequest.getRequest().getRequestedSessionId();System.out.println("wabacus操作动作产生的sessionid:" + wabSessionID);if (wabSessionID.indexOf("-") != -1) {rrequest.getRequest().getSession().setAttribute("sessionid", wabSessionID);String sessionid = (String)rrequest.getRequest().getSession().getAttribute("sessionid");System.out.println("用户登录时产生的sessionid:" + sessionid);if (context != null) {HttpSession session = (HttpSession) context.getAttribute(sessionid);rrequest.getRequest().getSession().setAttribute("userid", session.getAttribute("userPA01"));rrequest.getRequest().getSession().setAttribute("username", session.getAttribute("userName"));System.out.println("当前用户ID(PA01):" + session.getAttribute("userPA01"));System.out.println("当前用户姓名:" + session.getAttribute("userName"));rrequest.setAttribute("userid", rrequest.getRequest().getSession().getAttribute("userid"));rrequest.setAttribute("username", rrequest.getRequest().getSession().getAttribute("username"));}}/*Cookie[] cookies = rrequest.getRequest().getCookies();for (Cookie cookie : cookies) {System.out.println("cookies:"+cookie.getValue());}*/}}
为什么会有wabSessionID.indexOf("-") != -1这样的判断?
因为浏览器访问不能服务时生成的sessionid会有所不同,如下图,每二个id才是登录时产生的sessionid,而第一个则是访问wabacus服务时产生的sessionid
1、在xml页面上的使用
<sql><value><![CDATA[SELECT (SELECT COUNT(*) c FROM A25 WHERE {#condition#}) c,c01,c02 FROM A25 WHERE {#condition#} order by c07 desc]]></value><condition name="userid" label="操作人" hidden="true" source="session{userid}"><value><![CDATA[c05 = '#data#']]></value></condition></sql>
2、在其它拦截器中使用
// ***************************当前用户操作**************************** //
String userPA01 = (String) rrequest.getRequest().getSession().getAttribute("userid");
String userName = (String) rrequest.getRequest().getSession().getAttribute("username");
// ****************************************************************** //
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