Examples of javax.servlet.jsp.PageContext

javax.servlet.jsp.PageContext
A PageContext instance provides access to all the namespaces associated with a JSP page, provides access to several page attributes, as well as a layer above the implementation details. Implicit objects are added the pageContext automatically.
The PageContext class is an abstract class, designed to be extended to provide implementation dependent implementations thereof, by conformant JSP engine runtime environments. A PageContext instance is obtained by a JSP implementation class by calling the JspFactory.getPageContext() method, and is released by calling JspFactory.releasePageContext().
An example of how PageContext, JspFactory, and other classes can be used within a JSP Page Implementation object is given elsewhere.
The PageContext provides a number of facilities to the page/component author and page implementor, including:
- a single API to manage the various scoped namespaces
- a number of convenience API's to access various public objects
- a mechanism to obtain the JspWriter for output
- a mechanism to manage session usage by the page
- a mechanism to expose page directive attributes to the scripting environment
- mechanisms to forward or include the current request to other active components in the application
- a mechanism to handle errorpage exception processing
Methods Intended for Container Generated Code
Some methods are intended to be used by the code generated by the container, not by code written by JSP page authors, or JSP tag library authors.
The methods supporting lifecycle are initialize() and release()
The following methods enable the management of nested JspWriter streams to implement Tag Extensions: pushBody() and popBody()
Methods Intended for JSP authors
Some methods provide uniform access to the diverse objects representing scopes. The implementation must use the underlying Servlet machinery corresponding to that scope, so information can be passed back and forth between Servlets and JSP pages. The methods are: setAttribute(), getAttribute(), findAttribute(), removeAttribute(), getAttributesScope() and getAttributeNamesInScope() .
The following methods provide convenient access to implicit objects:

    public Set entrySet() {
        return Collections.EMPTY_SET;
    }


    public Object get(Object key) {
        PageContext pc = getPageContext();


        if (pc == null) {
            Map request = (Map) context.get("request");
            Map session = (Map) context.get("session");
            Map application = (Map) context.get("application");


            if ((request != null) && (request.get(key) != null)) {
                return request.get(key);
            } else if ((session != null) && (session.get(key) != null)) {
                return session.get(key);
            } else if ((application != null) && (application.get(key) != null)) {
                return application.get(key);
            }
        } else {
            try{
                return pc.findAttribute(key.toString());
            }catch (NullPointerException npe){
                return null;
            }
        }

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    public Set keySet() {
        return Collections.EMPTY_SET;
    }


    public Object put(Object key, Object value) {
        PageContext pc = getPageContext();
        if (pc != null) {
            pc.setAttribute(key.toString(), value);
        }


        return null;
    }

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    protected Map createExtraContext() {
        Map newParams = createParametersForContext();


        ActionContext ctx = new ActionContext(stack.getContext());
        ServletContext servletContext = (ServletContext) ctx.get(ServletActionContext.SERVLET_CONTEXT);
        PageContext pageContext = (PageContext) ctx.get(ServletActionContext.PAGE_CONTEXT);
        Map session = ctx.getSession();
        Map application = ctx.getApplication();


        Dispatcher du = Dispatcher.getInstance();
        Map<String, Object> extraContext = du.createContextMap(new RequestMap(req),

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            LOG.debug("Trying to render template " + template + ", repeating through parents until we succeed");
        }
        UIBean tag = templateContext.getTag();
        ValueStack stack = templateContext.getStack();
        stack.push(tag);
        PageContext pageContext = (PageContext) stack.getContext().get(ServletActionContext.PAGE_CONTEXT);
        List<Template> templates = template.getPossibleTemplates(this);
        Exception exception = null;
        boolean success = false;
        for (Template t : templates) {
            try {
                Include.include(getFinalTemplateName(t), pageContext.getOut(),
                        pageContext.getRequest(), (HttpServletResponse) pageContext.getResponse(), encoding);
                success = true;
                break;
            } catch (Exception e) {
                if (exception == null) {
                    exception = e;

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        Servlet servlet = JspSupportServlet.jspSupportServlet;


        velocityManager.init(servletContext);


        boolean usedJspFactory = false;
        PageContext pageContext = (PageContext) ActionContext.getContext().get(ServletActionContext.PAGE_CONTEXT);


        if (pageContext == null && servlet != null) {
            pageContext = jspFactory.getPageContext(servlet, request, response, null, true, 8192, true);
            ActionContext.getContext().put(ServletActionContext.PAGE_CONTEXT, pageContext);
            usedJspFactory = true;

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    public void doExecute(String finalLocation, ActionInvocation invocation) throws Exception {
        if (LOG.isDebugEnabled()) {
            LOG.debug("Forwarding to location " + finalLocation);
        }


        PageContext pageContext = ServletActionContext.getPageContext();


        if (pageContext != null) {
            pageContext.include(finalLocation);
        } else {
            HttpServletRequest request = ServletActionContext.getRequest();
            HttpServletResponse response = ServletActionContext.getResponse();
            RequestDispatcher dispatcher = request.getRequestDispatcher(finalLocation);

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              String errorPageURL, 
                                      boolean needsSession, int bufferSize, 
                                      boolean autoflush) 
    {
        try {
      PageContext pc;
      if( usePool ) {
    pc=(PageContext)pool.get();
    if( pc == null ) pc= new PageContextImpl(this);
      } else {
    pc =  new PageContextImpl(this);
      }


      //      System.out.println("JspFactoryImpl.getPC"  + pc);
      pc.initialize(servlet, request, response, errorPageURL, 
                          needsSession, bufferSize, autoflush);
      
            return pc;
        } catch (Throwable ex) {
            /* FIXME: need to do something reasonable here!! */

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public class Task extends HttpServlet {


   public void doPost(HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException {


      JspFactory jspFactory = null;
      PageContext pageContext = null;
      HttpSession session = null;
      Group group = null;


      String action = null;
      
      try {
      
         // If the Group bean hasn't been added to the session alerady, add it
         // this allows the user to go directly to ANY page
         jspFactory = JspFactory.getDefaultFactory();
         pageContext = jspFactory.getPageContext(this, request, response, "/error.jsp", true, 8192, true );
         session = pageContext.getSession();
         
         group = (Group)pageContext.getAttribute("group",PageContext.SESSION_SCOPE);
         if (group == null) {
            group=(Group)Beans.instantiate(this.getClass().getClassLoader(), "addressbook.Group" );
            pageContext.setAttribute("group", group, PageContext.SESSION_SCOPE );
         }


      
         // Since case matters, we need to check for both....
         if ( request.getParameter("action") != null ) {

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public class JspAutotagRuntimeTest {
    @Test
    public void testCreateRequest() {
        JspFragment jspBody = createMock(JspFragment.class);
        PageContext pageContext = createMock(PageContext.class);
        JspTag parent = createMock(JspTag.class);
        ApplicationContext applicationContext = createMock(ApplicationContext.class);
        HttpServletRequest httpServletRequest = createMock(HttpServletRequest.class);
        HttpServletResponse httpServletResponse = createMock(HttpServletResponse.class);
        expect(pageContext.getAttribute(
                ApplicationAccess.APPLICATION_CONTEXT_ATTRIBUTE,
                PageContext.APPLICATION_SCOPE)).andReturn(applicationContext);
        expect(pageContext.getRequest()).andReturn(httpServletRequest);
        expect(pageContext.getResponse()).andReturn(httpServletResponse);
        replay(jspBody, pageContext, parent, applicationContext, httpServletRequest, httpServletResponse);
        JspAutotagRuntime runtime = new JspAutotagRuntime();
        runtime.setJspBody(jspBody);
        runtime.setJspContext(pageContext);
        runtime.setParent(parent);

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     * @throws JspException If something goes wrong.
     */
    @Test
    public void testEvaluateWriter() throws JspException, IOException {
        JspFragment body = createMock(JspFragment.class);
        PageContext pageContext = createMock(PageContext.class);
        JspWriter writer = createMock(JspWriter.class);


        expect(pageContext.getOut()).andReturn(null);
        body.invoke(writer);


        replay(body, pageContext, writer);
        JspModelBody modelBody = new JspModelBody(body, pageContext);
        modelBody.evaluate(writer);

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