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:

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


        expect(pageContext.getOut()).andReturn(null);


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

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


        expect(pageContext.getOut()).andReturn(null);
        body.invoke(writer);
        expectLastCall().andThrow(new JspException());


        replay(body, pageContext, writer);
        try {

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            }
        }


        HashMap model = new HashMap();
        try {
            PageContext pageContext = JspFactory.getDefaultFactory().getPageContext(this, request, response, "", false, 8192, true);


            // special hack for menu tag
            request.setAttribute("pageRequest", pageRequest);


            // populate the rendering model

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        response.setContentType("text/html; charset=utf-8");
        
        // looks like we need to render content
        Map model = new HashMap();
        try {
            PageContext pageContext = JspFactory.getDefaultFactory().getPageContext(
                    this, request, response,"", false, 8192, true);
            
            // populate the rendering model
            Map initData = new HashMap();
            initData.put("request", request);

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    /**
     * Creates and returns the test PageContext that will be used for
     * the tests.
     */
    static PageContext createTestContext() {
        PageContext ret = new PageContextImpl();


        // Create some basic values for lookups
        ret.setAttribute("val1a", "page-scoped1", PageContext.PAGE_SCOPE);
        ret.setAttribute("val1b", "request-scoped1", PageContext.REQUEST_SCOPE);
        ret.setAttribute("val1c", "session-scoped1", PageContext.SESSION_SCOPE);
        ret.setAttribute("val1d", "app-scoped1", PageContext.APPLICATION_SCOPE);


        // Create a bean
        {
            Bean1 b1 = new Bean1();
            b1.setBoolean1(true);
            b1.setByte1((byte) 12);
            b1.setShort1((short) -124);
            b1.setChar1('b');
            b1.setInt1(4);
            b1.setLong1(222423);
            b1.setFloat1((float) 12.4);
            b1.setDouble1(89.224);
            b1.setString1("hello");
            b1.setStringArray1(new String[]{
                    "string1",
                    "string2",
                    "string3",
                    "string4"
            });
            {
                List l = new ArrayList();
                l.add(new Integer(14));
                l.add("another value");
                l.add(b1.getStringArray1());
                b1.setList1(l);
            }
            {
                Map m = new HashMap();
                m.put("key1", "value1");
                m.put(new Integer(14), "value2");
                m.put(new Long(14), "value3");
                m.put("recurse", b1);
                b1.setMap1(m);
            }
            ret.setAttribute("bean1a", b1);


            Bean1 b2 = new Bean1();
            b2.setInt2(new Integer(-224));
            b2.setString2("bean2's string");
            b1.setBean1(b2);


            Bean1 b3 = new Bean1();
            b3.setDouble1(1422.332);
            b3.setString2("bean3's string");
            b2.setBean2(b3);
        }


        // Create the public/private beans
        {
            ret.setAttribute("pbean1", Factory.createBean1());
            ret.setAttribute("pbean2", Factory.createBean2());
            ret.setAttribute("pbean3", Factory.createBean3());
            ret.setAttribute("pbean4", Factory.createBean4());
            ret.setAttribute("pbean5", Factory.createBean5());
            ret.setAttribute("pbean6", Factory.createBean6());
            ret.setAttribute("pbean7", Factory.createBean7());
        }


        // Create the empty tests
        {
            Map m = new HashMap();
            m.put("emptyArray", new Object[0]);
            m.put("nonemptyArray", new Object[]{"abc"});
            m.put("emptyList", new ArrayList());
            {
                List l = new ArrayList();
                l.add("hello");
                m.put("nonemptyList", l);
            }
            m.put("emptyMap", new HashMap());
            {
                Map m2 = new HashMap();
                m2.put("a", "a");
                m.put("nonemptyMap", m2);
            }
            m.put("emptySet", new HashSet());
            {
                Set s = new HashSet();
                s.add("hello");
                m.put("nonemptySet", s);
            }
            ret.setAttribute("emptyTests", m);
        }


        return ret;
    }

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     */
    @Override
    public void doTag() throws JspException {
        try {
            JspWriter out = getJspContext().getOut();
            PageContext context = (PageContext) getJspContext();
            String title = (String) context.getAttribute(_PAGE_SCOPE_TITLE_ID, PageContext.APPLICATION_SCOPE);
            out.print( title );
        } catch (IOException ex) {
            Logger.getLogger(TitleTag.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

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    @Override
    public void doTag() throws JspException {
        JspWriter out = getJspContext().getOut();


        try {
            PageContext context = (PageContext) getJspContext();
            String content = (String) context.getAttribute(_PAGE_SCOPE_CONTENT_ID, PageContext.APPLICATION_SCOPE);


            out.println(content);


        } catch (java.io.IOException ex) {
            throw new JspException("Error in InsertContentTag tag", ex);

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     */
    @Override
    public void doTag() throws JspException {
        try {


            PageContext pageContext = (PageContext) getJspContext();
            String templatePath = null;


            boolean ifIniting = false;
            try {
                Object bundleObj = (bundleObject == null) ? null : pageContext.getAttribute(bundleObject, PageContext.REQUEST_SCOPE);
                if (bundleObj == null) {
                    bundleObj = InstanceCreator.getInstance(className);
                    ifIniting = true;
                }
                AnnotationParser parser = new AnnotationParser(bundleObj, group);
                // 设定元素的默认值
                if (ifIniting) {
                    parser.settingDefaultValue();
                }
                ApplicationStyle style = settingAppStyle(pageContext);
                // 设定模板路径
                templatePath = style.getTemplatePath();
                // 设定许可
                Permission permissionImpl = null;
                if (isPermission()) {
                    permissionImpl = PermissionManager.getUserPermission();
                }
                ContentTemplate contentTemplate = (ContentTemplate) style.getTemplate(ContentTemplate.class);
                contentTemplate.setParser(parser);
                contentTemplate.setPermission(permissionImpl);
                String content = contentTemplate.content();


                settingContentScope(pageContext, content, parser.getTitle());
                template = (templatePath == null ? _BLANK : templatePath) + template;


                pageContext.include(template);
            } catch (AppException ex) {
                settingContentScope(pageContext, ex.getMessage(), _ERROR_TITLE_DISPLAY);
            }


        } catch (ServletException ex) {

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  public static Map createPageScopeMap (PageContext pContext)


  {


    final PageContext context = pContext;


    return new EnumeratedMap ()


      {


  public Enumeration enumerateKeys () 


  {


    return context.getAttributeNamesInScope


      (PageContext.PAGE_SCOPE);


  }






  public Object getValue (Object pKey) 


  {


    if (pKey instanceof String) {


      return context.getAttribute


        ((String) pKey, 


         PageContext.PAGE_SCOPE);

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  public static Map createRequestScopeMap (PageContext pContext)


  {


    final PageContext context = pContext;


    return new EnumeratedMap ()


      {


  public Enumeration enumerateKeys () 


  {


    return context.getAttributeNamesInScope


      (PageContext.REQUEST_SCOPE);


  }






  public Object getValue (Object pKey) 


  {


    if (pKey instanceof String) {


      return context.getAttribute


        ((String) pKey, 


         PageContext.REQUEST_SCOPE);

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