Tomcat多应用共享Session

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1. 新建两个应用：

test1
    |------WEB-INF
    |              |------web.xml
    |------test.jsp

test.jsp代码
[java] view plaincopy
<%
    session.setAttribute("test1Session","test1Session");
    session.getServletContext().setAttribute("t1_session",session);
    out.println("Application /test1 is ok!<br>");

    if(session.getServletContext().getContext("/test2")!=null){
        HttpSession t2_session = (HttpSession)session.getServletContext().getContext("/test2").getAttribute("t2_session");
        if(t2_session!=null){
            String str = (String)t2_session.getAttribute("test2Session");
            String path = request.getContextPath();
            out.println("Application "+path +":"+str+"<br>");
        }else{
            out.println("Application /test2 no data!");
        }
    }
%>

test2
    |------WEB-INF
    |              |------web.xml
    |------test.jsp

test.jsp代码
[java] view plaincopy
<%
    session.setAttribute("test2Session","test2Session");
    session.getServletContext().setAttribute("t2_session",session);
    out.println("Application /test2 is ok!<br>");

    if(session.getServletContext().getContext("/test1")!=null){
        HttpSession t1_session = (HttpSession)session.getServletContext().getContext("/test1").getAttribute("t1_session");
        if(t1_session!=null){
            String str = (String)t1_session.getAttribute("test1Session");
            String path = request.getContextPath();
            out.println("Application "+path +":"+str+"<br>");
        }else{
            out.println("Application /test1 no data!");
        }
    }
%>

2. 配置tomcat，设置crossContext = true，让两个应用可以在tomcat中交叉使用上下文环境。

<Context path="/test1" docBase="C:/test1" reloadable="true" crossContext="true"></Context>
<Context path="/test2" docBase="C:/test2" reloadable="true" crossContext="true"></Context>

3. 启动Tomcat，访问http://localhost:8080/test1/test.jsp

页面输出：Application /test1 is ok!------------------------test1存储session成功
                    Application /test2 no data!--------------------test2还没有被访问，所以test2的session中没有数据
访问http://localhost:8080/test2/test.jsp
页面输出：Application /test2 is ok!------------------------test2存储session成功
                    Application /test2:test1Session-------------test1Session来自test1应用中session

刷新http://localhost:8080/test1/test.jsp
页面输出：Application /test1 is ok!------------------------test1存储session成功
                    Application /test1:test2Session-------------test2Session来自test2应用中session

应用test1和test2成功共享session，可以互相访问另一个应用中的session和session中的数据。

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