Disable Enter key in Form tag

Placing the following code in your page section will disable the enter key operation in text field

 <script type="text/javascript">   
 function stopRKey(evt) {   
  var evt = (evt) ? evt : ((event) ? event : null);   
  var node = (evt.target) ? evt.target : ((evt.srcElement) ? evt.srcElement : null);   
  if ((evt.keyCode == 13) && (node.type=="text")) {return false;}   
 }   
 document.onkeypress = stopRKey;   
 </script>  

Source : http://www.webcheatsheet.com

Redirect Action result to another action in struts2

Using special result type in Struts-2 result we can forward one actions result to another action before forwarding it to view logic.
"redirect-action" result type is used to achieve this.here is the sample code snippet to show how to redirect one actions result to another action

 <action name="userInfo" class="UserAction">  
  <!-- Redirect to another namespace -->  
  <result type="redirect-action">  
   <param name="actionName">getDetails</param>  
   <param name="userId">${userId}</param>  
  </result>  
 </action>  

Here after finishing userInfo action getDetails action will be invoked.Here by using "Param" tags we can pass the values to the getDetails action.

Displaying Current Date using Javascript

We can get the current date using the javascript build-in functions. To get the current date we have to use

 var dt new Date()  

in javascript.This creates one date type variable which holds all the date related informations like date,moth,year,time etc,.
Displaying this in any component or in alert will give information like

 Wed Aug 25 2010 13:42:41 GMT+0530 (India Standard Time)  

There are various methods are available in javascript to get the details only what we needed from this .We can use these methods like

 dt.getMonth();  
 dt.getDate();  

First one(getMonth()) gives only current month(0-11),getDate() gives the current date.Here is the sample to get MM/DD/YYYY for the current date in javascript

   var curr_date=new Date();   
   var month=curr_date.getMonth()+1;  
   var day=curr_date.getDate();  
   var year=curr_date.getYear();  
   // Y2K compliant  
   if (year < 1000) year +=1900;  
   document.getElementById(component).value = month + "/" + day + "/" + year;  

In this the getYear() method will return non Y2K compliant year(110 for 2010 ! ) to make this Y2K complian ,we need to add 1900 with that.

Creating a ZIP file in JAVA

Using ZipOutputStream and  Class in java.util.zip package we can craete an zip entry for the list of files.
The following gives the sample to create an zip file "outfile.zip" .This zip whill be created using the contents those given in the 'filenames' array.

1:  // These are the files to include in the ZIP file  
2:  String[] filenames = new String[]{"filename1", "filename2"};  
3:  // Create a buffer for reading the files  
4:  byte[] buf = new byte[1024];  
5:  try {  
6:    // Create the ZIP file  
7:    String outFilename = "outfile.zip";  
8:    ZipOutputStream out = new ZipOutputStream(new FileOutputStream(outFilename));  
9:    // Compress the files  
10:    for (int i=0; i<filenames.length; i++) {  
11:      FileInputStream in = new FileInputStream(filenames[i]);  
12:      // Add ZIP entry to output stream.  
13:      out.putNextEntry(new ZipEntry(filenames[i]));  
14:      // Transfer bytes from the file to the ZIP file  
15:      int len;  
16:      while ((len = in.read(buf)) > 0) {  
17:        out.write(buf, 0, len);  
18:      }  
19:      // Complete the entry  
20:      out.closeEntry();  
21:      in.close();  
22:    }  
23:    // Complete the ZIP file  
24:    out.close();  
25:  } catch (IOException e) {  
26:  }  

Source : http://www.exampledepot.com