JSP取得内置对象

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<hr>-----request.getAttributeNames---------<hr><%{ Enumeration<String> attrEnum =request.getAttributeNames();String attrName = null;while (attrEnum.hasMoreElements() ) {attrName = attrEnum.nextElement();out.println( attrName + ":");    out.println( request.getAttribute(attrName) + "<br>");}}%><hr>------request.getParameterNames---------<hr><%{ Enumeration<String> attrEnum =request.getParameterNames();String attrName = null;while (attrEnum.hasMoreElements() ) {attrName = attrEnum.nextElement();out.println( attrName + ":");    out.println( request.getParameter(attrName) + "<br>");}}%><hr>-----request.getHeaderNames----------<hr><%{ Enumeration<String> attrEnum =request.getHeaderNames();String attrName = null;while (attrEnum.hasMoreElements() ) {attrName = attrEnum.nextElement();out.println( attrName + ":");    out.println( request.getHeader(attrName) + "<br>");}}%><hr>-------session.getAttributeNames--------<hr><%{ Enumeration<String> attrEnum =session.getAttributeNames();String attrName = null;while (attrEnum.hasMoreElements() ) {attrName = attrEnum.nextElement();out.println( attrName + ":");    out.println( session.getAttribute(attrName) + "<br>");}}%>