The previous chapter mainly tells the concept of JSP built-in object; this time, this time, some ways to build a built-in object.
1, the main method of request object:
☉ gettribute (String Name) Returns the Name property value.
☉ GetaTtributeNames () Returns all attribute names of the Request object.
☉ getCookies () Returns the Cookies object of the client.
☉ GetHeader (String Name) Gets the file header information defined by the HTTP protocol.
☉ GetHeaders (String Name) Returns all values of the Request Header of the specified name.
☉ getMethod () gets the client to transmit data to the server.
☉ getParameter (String Name) Get the parameter value of the client to the server.
☉ getParameterNames () gets the name of all parameters of the client to the server.
☉ getParameterValue (String Name) Get all values of the specified parameter.
☉ getProtocol () Gets the name of the protocol that the client is transferred to the server.
☉ getQueryString () get the query string.
☉ getRequesturi () Get the client address that issues a request string.
☉ getRemoteAddr () Get the IP address of the client.
☉ getRemotehost () Get the name of the client.
☉ GetServerName () Get the name of the server.
☉ GetServletPath () Get the file path of the script file requested by the client.
☉ GetServerPort () Get the port number of the server.
☉ setttribute (String name, java.lang.Object objt) Sets the value of the request parameter named Name, which is specified by the OBJT of the java.lang.object type.
Example: [Request.jsp]
Request Information
JSP Request Method: <% = request.getMethod ()%>
Request uri: <% = request.getRequesturi ()%>
Request Protocol: <% = request.getProtocol ()%>
Servlet Path: <% = request.getServletPath ()%>
Remote User: <% = request.getRemoteuser ()%>
Remote address: <% = request.getRemoteAdddr ()%>
Remote host: <% = request.getRemoteHost ()%>
Path Info: <% = request.getPathInfo ()%>
Path Translated: <% = request.getPathTranslated ()%>
Query String: <% = request.getQueryString ()%>
Content Length: <% = Request.getContentLength ()%>
Content Type: <% = request.getContentType ()%>
Server name: <% = request.getServerName ()%>
Server port: <% = request.getServerPort ()%>
Authorization scheme: <% = request.getAutHTYPE ()%>
The Browser You are using is <% = Request.getHeader ("User-Agent")%>
2, the main method of response object:
☉ AddCookie (cookie cook) Add a cookie object to save the client's user information.
☉ Addheader (String Name, String Value) Add HTTP file header information.
☉ ContainSheader (String Name) Determines if the HTTP file header of the specified name already exists.
☉ Senderror (int) sends an error information to the client.
☉ SetHeader (String Name, String Value) Sets the value of the HTTP file header of the specified name.
Example: Timed refresh [refresh.jsp]
<% @ Page ContentType = "text / html; charset = GB2312"%>
<% @ Page Import = "java.util.date"%>
Timed Refresh Page </ Title></p>
<p></ hEAD></p>
<p><body></p>
<p><b> This page is used to illustrate the response object </ b></p>
<p><br></p>
<p><b> The current time is: </ b></p>
<p><% response.setHeader ("Refresh", "10");%></p>
<p><%</p>
<p>Out.println (New Date ());</p>
<p>%></p>
<p></ body></p>
<p></ html></p>
<p>3, OUT object main method:</p>
<p>☉ Out.print / Println (Boolean | Char | Char [] | Double | FLOAT | INT | Long | Object | String |) Outputs various types of data.</p>
<p>☉ Out.newline () Outputs a wrap character.</p>
<p>☉ Out.flush () Outputs the data in the buffer.</p>
<p>☉ Out.close () Turn off the output stream.</p>
<p>☉ Out.clearbuffer () Clear the data in the buffer and output the data to the client.</p>
<p>☉ Out.clear () Clear the data in the buffer, but does not output the data to the client.</p>
<p>☉ Out.getBuffersize () Get the size of the buffer.</p>
<p>☉ Out.getRemaining () Get the size of the space that is not occupied in the buffer.</p>
<p>☉ Out.isautoflush () Returns the Boolean value.</p>
<p>4, the main method of session object:</p>
<p>☉ GetaTtribute (String Name) Get information that is associated with the specified name Name.</p>
<p>☉ GetAttributeNames () Returns every property object stored in the Session object.</p>
<p>☉ getCreationTime () Returns the time created by Session.</p>
<p>☉ GetId () returns the unique identifier to generate it for every session. ☉ getLastAccessedTime () Returns the time that the current session object is last sent by the customer.</p>
<p>☉ getMaxinactiveInterval () Returns the total time (seconds).</p>
<p>☉ RemoveAttribute (String Name) Deletes information about the associated name Name.</p>
<p>☉ SetAttribute (String Name, Java.lang.Object Value) Sets the property value value value specified Name and stores in the Session object.</p>
<p>5, PageContext object main method:</p>
<p>☉ gettribute scope () Retrieves a range of specific named objects.</p>
<p>☉ FindAttribute () is used to implement a search for a named property in order to follow the order requested, session, and application range.</p>
<p>☉ SetAttribute () is used to set the named object in the range or specific range of the default page.</p>
<p>☉ RemoveAttribute () is used to delete the default page range or the object already named.</p>
<p>6. The main method of Application object:</p>
<p>☉ GetAttribute (String Name) Returns the value of the properties of the name Application object specified by name.</p>
<p>☉ gettributenames () Returns the name of all the properties of all Application objects.</p>
<p>☉ GetInitParameter (String Name) Returns the initial value of an attribute of an Application object specified by name.</p>
<p>☉ GetServletInfo () Returns the current version of the servlet compiler.</p>
<p>☉ SetAttribute (String Name, Object Object) Sets the property value Object of the Application object specified by the name name.</p>
<p>Example: Online.jsp] <% @ Page ContentType = "TEXT / HTML; Charset = GB2312"%></p>
<p><body οnunlοad = "javascript: ca ZAN;">></p>
<p><%</p>
<p>Integer I = (Integer) Application.getaTRibute ("counter");</p>
<p>String name = (string) Application.getaTRibute ("OnlineName");</p>
<p>// StringBuffer Total = New StringBuffer (Name);</p>
<p>%></p>
<p><font color = "blue"></p>
<p><% out.println ((String) session.gettribute ("UserName"));%> Hello:</p>
<p></ font></p>
<p><br></p>
<p><font color = "red"></p>
<p>Current online number: <% = i%></p>
<p></ font></p>
<p><br></p>
<p><font color = "green"></p>
<p>Online People Total: <% OUT.PRINTLN (Name);%></p>
<p></ font></p>
<p><script language = "javascript"></p>
<p><! -</p>
<p>Function Cancel () {</p>
<p><%</p>
<p>IF (session.getattribute ("UserName")! = "" && session.getattribute ("username")! = null) {// cancelname is the logan name</p>
<p>String CancelName;</p>
<p>CancelName = (string) session.getattribute ("UserName");</p>
<p>//out.println (Cancelname);</p>
<p>// j is the initial location of CancelName in the total roster</p>
<p>// k for the total length of CancelName</p>
<p>// t is the end position of CancelName in the total roster</p>
<p>INT J, K, T;</p>
<p>J = Name.indexof (CancelName);</p>
<p>K = cancelname.length ();</p>
<p>T = J K;</p>
<p>//out.println(J);</p>
<p>//out.println (T);</p>
<p>StringBuffer Total = New StringBuffer;</p>
<p>Total = Total.delete (J-4, T);</p>
<p>i = new integer (I.intValue () - 1);</p>
<p>Application.SetaTRibute ("Counter", i);</p>
<p>Name = (string) Total.Tostring ();</p>
<p>Application.setttribute ("OnlineName", Name);</p>
<p>//out.println ("window.alert (" Name ") ")")</p>
<p>Session.setttribute ("UserName", "");</p>
<p>}</p>
<p>%></p>
<p>}</p>
<p>-></p>
<p></ script></p>
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