ui:repeat in Java class

Hi,

To achieve ui:repeat in Java class.

The object to be looped on must be list or an array.

 //It is the context called by current threads request  
 FacesContext context = FacesContext.getCurrentInstance();  
 // Application instance associated with this web application.  
 Application application = context.getApplication();  
 //Here component type will be facelets.ui.Repeat  
 UIRepeat repeat= (UIRepeat) application  
                 .createComponent(UIRepeat.COMPONENT_TYPE);  
                 //Here the ID is set  
                 repeat.setId("repeatGrid");  
                 //The variable name is set  
                 repeat.setVar("value");  
 //used to calculate the value for the specified attribute or property name, if any  
 //Here the value is set for “value” attribute  
                 repeat  
                 .setValueExpression(  
                                 "value",  
                                 getValueExpression(fc,  
                                                 "#{valueList.value}"));  

You can add “repeat” variable to "parentObject"(parent object) by using

 parentObject.getChildren().add(repeat);  

This implementation was done for the dynamic population through methods inside java classes.

You can implement in jsf simply through this.

 <ui:repeat var=" value " value=""#{valueList.value}">  
         <h:outputText value="#{ value }”/>  
 </ui:repeat>  

Thanks.

Spiral Value Assigned Matrix

Hi,


I got a question from my friend, if user gives input 6 or  any number it should show matrix in the form of normal and Spiral assigned values.

Matrix Size is: 6

Normal Matrix is:

    1    2    3    4    5    6
    7    8    9   10   11   12
   13   14   15   16   17   18
   19   20   21   22   23   24
   25   26   27   28   29   30
   31   32   33   34   35   36
Spiral Matrix is:

    1     2        3     4      5      6
   20    21    22    23    24     7
   19    32    33    34    25     8
   18    31    36    35    26     9
   17    30    29    28    27    10
   16    15    14    13    12    11

I had gone through the problem, got it can be solved in 4 recurring  steps.

 package newlearn;  
 import java.util.Scanner;  
 /**  
  *   
  * @author Ramakrishna Panni  
  *  
  */  
 public class SpiralMatrix {  
      public static void main(String[] args) {  
           // TODO Auto-generated method stub  
           try{  
                System.out.println("Enter matrix size to get spiral matrix");  
                Scanner sc = new Scanner(System.in);  
                String[] inter = sc.nextLine().trim().split(" ");  
                int size = Integer.parseInt(inter[0]);  
                System.out.println("Matrix Size is: "+size);  
                sc.close();  
                int higestValue = size*size;  
                int spiralMatrix[][] = new int[size][size];  
                int normalMatrix[][] = new int[size][size];  
                int normalValue = 0;  
                for(int i=0;i<size;i++)  
                {  
                     for(int j=0;j<size;j++)  
                     {  
                          normalMatrix[i][j] = ++normalValue;  
                          spiralMatrix[i][j] = 0;  
                     }  
                }  
                System.out.println("Normal Matrix is:\n");  
                for(int i=0;i<size;i++)  
                {  
                     for(int j=0;j<size;j++)  
                     {  
                          System.out.printf("%5d",normalMatrix[i][j]);  
                     }  
                     System.out.println("");  
                }  
                int lastValue=0;  
                int step = 1;  
                int step1Col = 0;  
                int step1Row = 0;  
                int step2Col = 0;  
                int step2Row = 0;  
                int step3Col = 0;  
                int step3Row = 0;  
                int step4Col = -1;  
                int step4Row = 0;  
                while (lastValue < higestValue) {  
                     step = 1;  
                     //this is the step where value assigned in Horizontal incrementing positional way  
                     if(step == 1)  
                     {  
                          step1Row = step4Row;  
                          step1Col = ++step4Col;  
                          for(int j=step1Col;j<size;j++)  
                          {  
                               if(spiralMatrix[step1Row][j] == 0)  
                               {  
                                    spiralMatrix[step1Row][j] = ++lastValue;  
                                    step1Col = j;  
                               }  
                               else{  
                                    break;  
                               }  
                          }  
                          step = ++step;  
                     }  
                     //this is the step where value assigned in Vertical incrementing positional way  
                      if (step == 2)  
                     {  
                          step2Col = step1Col;  
                          step2Row = step1Row+1;  
                          for(int i=step2Row;i<size;i++)  
                          {  
                               if(spiralMatrix[i][step1Col] == 0)  
                                    {  
                                         spiralMatrix[i][step1Col] = ++lastValue;  
                                         step2Row = i;  
                                    }  
                                    else{  
                                         break;  
                                    }  
                          }  
                          step = ++step;  
                     }  
                     //this is the step where value assigned in Horizontal decrementing positional way  
                      if(step==3)  
                     {  
                          step3Row = step2Row;  
                          step3Col = step2Col-1;  
                               for(int j=step3Col;j>=0;j--)  
                               {  
                                    if(spiralMatrix[step3Row][j] == 0)  
                                    {  
                                         step3Col = j;  
                                         spiralMatrix[step3Row][j] = ++lastValue;  
                                    }  
                                    else{  
                                         break;  
                                    }  
                               }  
                          step = ++step;  
                     }  
                     //this is the step where value assigned in Vertical incrementing decrementing positional way  
                     if(step==4)  
                     {  
                               step4Row = --step3Row;  
                               step4Col = step3Col;  
                               for(int i=step4Row;i>=0;i--)  
                               {  
                                    if(spiralMatrix[i][step4Col] == 0)  
                                    {  
                                         step4Row = i;  
                                         spiralMatrix[i][step4Col] = ++lastValue;  
                                    }  
                                    else{  
                                         break;  
                                    }  
                               }  
                          step = ++step;  
                     }  
                }  
                System.out.println("Spiral Matrix is:\n");  
                for( int i=0;i<size;i++)  
                {  
                     for( int j=0;j<size;j++)  
                     {  
                          System.out.printf("%5d ",spiralMatrix[i][j]);  
                     }  
                     System.out.println("");  
                }  
           }  
           catch(Exception e)  
           {  
                e.printStackTrace();  
                System.out.println("Something Went wrong............Please run again.....");  
           }  
      }  
 }  

Reading DOC file and writing in PDF using HWPF,LOWAGIE objects

Hi,

I came across writing into PDF using HWPF,LOWAGIE  objects in CF as well as in JAVA. Here I am reading a DOC file and copying contents to a PDF. It can be used alternate to CFDOCUMENT for CF8 below versions.

Required JARS are

 <cfscript>  
      // Creating JAVA fileinput stream object  
      fileinput = CreateObject("java", "java.io.FileInputStream");  
      // Calling InputStream constructor  
      fileinput.init("C:\Users\admin\Adobe ColdFusion Builder workspace\Practise\word.doc");  
      //Creating HWPF object  
      document = CreateObject("java", "org.apache.poi.hwpf.HWPFDocument");  
      // Calling HWPF constructor  
      document.init(fileinput);  
      // Creating a WordExtractor Object  
      reader = CreateObject("java", "org.apache.poi.hwpf.extractor.WordExtractor");  
      // Calling WordExtractor constructor  
      reader.init(document);  
      //Each line is captured in docfile as an array  
      docfile = reader.getParagraphText();  
      //Dumpingto see Docfile in array format  
      writeDump(docfile);  
      docfilefull = '';  
      //convertingarray to string  
      for(a in docfile)  
      {  
           docfilefull = docfilefull & a & chr(13) & chr(10);  
      }  
      //Creating lowagie object  
      document = CreateObject("java", "com.lowagie.text.Document");  
      // Calling lowagie constructor  
      document.init();  
      // Creating FileOutputStream object  
      fileIO = CreateObject("java", "java.io.FileOutputStream");  
      // Calling FileOutputStream constructor with path/name of file to written  
      fileIO.init("C:\Users\admin\Desktop\word19.pdf");  
      // Creating PdfWriter object  
      writer = CreateObject("java", "com.lowagie.text.pdf.PdfWriter");  
      //Calling getInstance method  
      writer.getInstance(document, fileIO);  
      //Calling open method of lowgie object  
      document.open();  
      // Creating Paragraph object  
      paragraph = CreateObject("java", "com.lowagie.text.Paragraph");  
      //Calling paragraph constructor passing the string which have the doc file content  
      paragraph.init(docfilefull);  
      //Writing the PDF document with DOC contents  
      document.add(paragraph);  
      //Closing document  
      document.close();  
 </cfscript>  

Creating Custom JSP Tags

Hi,

You people all know how to create custom tags in class file using doStart,doEnd functions

Its cumbersome to use all that function and we have to define custom tags in web.xml also

Here i am going to show a simple method to create custom(User defined Tags)

Let me tell you for what purpose custom tags are used

• To implement business logic
• To hide important functionality
• Code reuse

We get all the 9 default objects of jsp's in custom tag body. So we can access everything which is there in JSP. So get used to custom tags it will help u alot 

 Steps to create Custom tags

1. Create a folder named "tags" in web-inf
2. Right click on "tags" folder new->others->JSP Tag

Steps to use Custom tag in JSP file

1. Have to add <%@taglib %> in that 
2. Use "uri" attribute give path of "tags" folder 
3. Use attribute "prefix" to use custom tag