Javaweb Summary of the transfer of two project sessions and page transfer between different projects

The business system and a cms system in the project need to share sessions. This is a summary of my work. I don't know if it is SSO. What I want is to implement functions.
Project A and Project B are two different projects under tomcat, Project A is the business system, and Project B is the cms system, the goal is to log on to A and jump to B to get the session information of.
Because A cannot directly jump to B's page in struts. xml of a after login, A adds A jsp page in A (to jump to B's page in this page) to jump to this page.
After obtaining the session information on this jsp page, pass the parameters through c: redirect and pass the required information in the session separately:
<C: redirect url = 'HTTP: // localhost: 8080/Project B/XXX.html '>
<C: param name = "orgName" value = "<% = sessionDto. getOrgName () %>"> </c: param>
<C: param name = "deptName" value = "<% = sessionDto. getDeptName () %>"> </c: param>
<C: param name = "personName" value = "<% = sessionDto. getPersonName () %>"> </c: param>
</C: redirect>
On the page B, obtain the url string passed through the url path and parameters. Note that, if the preceding parameters are obtained in Chinese, they are garbled like % e9 % 9b % 86% e5 % 9b % a2 % e6 % 9c % ac % e9 % 83% a8,
You must use the decodeURI () method for transcoding.

Now, the page of B is displayed. The following shows how to obtain the session information of:
First, configure it under the tomcat server. xml </Host> tab:
<Context docBase = ".. \ webapps \ Project A" path = "/A" reloadable = "true" crossContext = "true"/>
<Context docBase = ".. \ webapps \ Project B" path = "/B" reloadable = "true" crossContext = "true"/>
In the logon action of:
HttpSession session2 = request. getSession ();
Session2.setAttribute ("sessionDto", session information of );
ServletContext ContextA = session2.getServletContext ();
ContextA. setAttribute ("session", session2 );

Write a filter in web-inf/web. xml of B:
<Filter>
<Filter-name> sessionFilter </filter-name>
<Filter-class> com. XXX. util. sessionFilter </filter-class>
</Filter>
<Filter-mapping>
<Filter-name> sessionFilter </filter-name>
<Url-pattern>/* </url-pattern>
</Filter-mapping>
This function is used to obtain the session of A at any time when A is redirected to B.
In the doFilter method:
HttpSession session = request. getSession ();
ServletContext Context = session. getServletContext ();
ServletContext Context1 = Context. getContext ("/Project ");
If (Context1! = Null &&! Context1.equals ("")){
HttpSession session1 = (HttpSession) Context1.getAttribute ("session ");
Request. setAttribute ("sessionDto", session1.getAttribute ("sessionDto "));
}

To obtain the menu permission of A on the html page of B, call A jsp page in B through iframe on the page of B, this jsp page is used to obtain menu permissions,
<Iframe height = "100" width = "100" id = "getSessionIframe" src = "http: // localhost: 8080/Project A/pages/login/getSession. jsp "style =" display: none; "> </iframe>
Obtain the value on the iframe page on the html page of B:
Var userid=frames{'getsessioniframe'{.doc ument. getElementById ("userid"). value;
In this way, the menu permission of A is also obtained.