| // program to illustrate use of BSF in a JSP-generated servlet |
| // like scenario. The model is there's a series of Java code pieces |
| // intermixed with a series of JavaScript code pieces. |
| |
| import org.apache.bsf.*; |
| |
| public class JSPLikeInJavaScript { |
| BSFManager mgr = new BSFManager (); |
| BSFEngine js; |
| |
| /* assume that the JSP page is compiled into the constructor: |
| intermix java and javascript code now. The .jsp could've looked |
| like the following (I'm guess syntax here..). Note that it uses |
| LiveConnect (part of rhino) to run. I'm assuming that language |
| was set to javascript (rhino) somewhere before. |
| <html> |
| <head><title>JSPLike</title></head> |
| <body> |
| <% var response = bsf.lookupBean ("response"); |
| // above is the bean registered into bsf with the name "response" |
| // I can now call methods on that bean etc. using response.*. |
| var startDate = new java.util.Date (); |
| var startDateStr = startDate + ""; %> |
| <h1>Welcome at <%= startDateStr %></h1> |
| stuff |
| Response bean's length is: <%= response.length %> |
| Response bean's uppercase value is: <%= response.toUpperCase () %> |
| <% var endDate = new java.util.Date (); |
| var endDateStr = endDate + ""; %> |
| <h5>Page generation done at <%= endDateStr %></h5> |
| </body> |
| </html> |
| */ |
| public JSPLikeInJavaScript () throws BSFException { |
| js = mgr.loadScriptingEngine ("javascript"); |
| |
| // first register the response bean into the runtime |
| mgr.registerBean ("response", new String ("howdy-doody")); |
| |
| Object result; |
| |
| System.out.println ("<html>"); |
| System.out.println ("<head><title>JSPLike</title></head>"); |
| System.out.println ("<body>"); |
| |
| result = js.eval ("", 0, 0, |
| "var response = bsf.lookupBean (\"response\");" + |
| "var startDate = new java.util.Date ();" + |
| "var startDateStr = startDate + \"\";"); |
| System.out.print ("<h1>Welcome at "); |
| result = js.eval ("", 0, 0,"startDateStr"); |
| System.out.println (result + "</h1>"); |
| System.out.println ("stuff"); |
| System.out.print ("Response bean's length is: "); |
| result = js.eval ("", 0, 0,"response.length() + \"\""); |
| System.out.println (result); |
| System.out.print ("Response bean's uppercase value is: "); |
| result = js.eval ("", 0, 0,"response.toUpperCase() + \"\""); |
| System.out.println (result); |
| result = js.eval ("", 0, 0,"var endDate = new java.util.Date ();" + |
| "var endDateStr = endDate + \"\";"); |
| System.out.print ("<h5>Page generation done at "); |
| result = js.eval ("", 0, 0,"endDateStr"); |
| System.out.println (result + "</h5>"); |
| System.out.println ("</body>"); |
| System.out.println ("</html>"); |
| } |
| |
| public static void main (String[] args) throws Exception { |
| new JSPLikeInJavaScript (); |
| } |
| } |
