Common | Techartifact

November 17, 2013November 19, 2013

How to Read/convert an InputStream to a String

There are multiple ways .I will list down few of them.

Using Old and standard java solution –

public static String fromStream(InputStream in) throws IOException
{
    BufferedReader reader = new BufferedReader(new InputStreamReader(in));
    StringBuilder out = new StringBuilder();
    String line;
    while ((line = reader.readLine()) != null) {
        out.append(line);
    }
    return out.toString();
}

return sb.toString();

if you using Google-Collections/Guava-

InputStream stream = ...
String content = CharStreams.toString(new InputStreamReader(stream, Charsets.UTF_8));
Closeables.closeQuietly(stream);

If you can use Apache Common library..then this is useful –

StringWriter writer = new StringWriter();
IOUtils.copy(inputStream, writer, encoding);
String theString = writer.toString();

Quick way but only work in deserialization process –

String result = (String)new ObjectInputStream( inputStream ).readObject();

Note:ObjectInputStream is about deserialization, and the stream have to respect the serialization protocol to work, which may not always true in all cases.

In the end, the most efficient solution and only in two lines using java Scanner class –

Tricky is to remember the regex \A, which matches the beginning of input. This effectively tells Scanner to tokenize the entire stream, from beginning to (illogical) next beginning.

public static String convertToString(InputStream in) {
    java.util.Scanner s = new java.util.Scanner(in).useDelimiter("\\A");  
        
    return s.hasNext() ? s.next() : "";
}

I would love to hear any comment by you for making more simple…

Happy learning by Vinay Kumar in techartifact

October 29, 2013January 20, 2014

How to create custom component in Webcenter Content (UCM)

Requirement – How to Create a UCM custom component

Solutions- Please follow the below steps –

Starting the componentWizard – CD to the path where the component wizard is.
[[email protected] ~]$ cd /oracle/Middleware/user_projects/domains/ucm_domain/ucm/cs/bin // this path will of your weblogic domain
[[email protected] bin]$ ./ComponentWizard

1. Goto Options -> Add
You get the below window.
Fill in the component Name. Click OK.

You get below screen.
Custom component gets created here (path may be different for you)
/oracle/ecm/ucm_domain/ucm/cs/custom
The component is created and you can add resources by clicking Add.

1. Select service. Click next.

Fill in the Name of the Service, Service class, Template. Fill in access levels.
Add actions by clicking on Add.

Click OK. Click Finish.

Similarly Add a Resource.

Resources created
demo_component_resource.htm
demo_component_service.htm
demo_component.hda

Modify the resource.htm as below. Give the Service name, handler name and search order.
The handler name is the fully qualified name of the java file where the service method (printTheName()) is created.

Place the compiled java class file in the classes folder inside the custom component.
cs/custom/demo_component/classes/de/xyz/ucm/service

Build the component to create the manifest.hda file. Demo_component.zip is created that can now be installed on other UCM and used.
Build by clicking on Build.

Enable the component.

Hit the browser with the service Name and required parameters
http://192.168.0.118:16200/cs/idcplg?IdcService=PRINT_THE_NAME&IsJava=1&dDocName=HO051621920
My java code is as below. (Calls a standard UCM service from my custom service)

package de.xyz.ucm.service;

import java.io.File;
import java.io.IOException;
import intradoc.common.ExecutionContext;
import intradoc.common.LocaleUtils;
import intradoc.common.Log;
import intradoc.common.ServiceException;
import intradoc.common.SystemUtils;
import intradoc.data.DataBinder;
import intradoc.data.DataException;
import intradoc.data.DataResultSet;
import intradoc.data.ResultSet;
import intradoc.data.Workspace;
import intradoc.provider.Provider;
import intradoc.provider.Providers;
import intradoc.server.Service;
import intradoc.server.ServiceData;
import intradoc.server.ServiceHandler;
import intradoc.server.ServiceManager;
import intradoc.server.UserStorage;
import intradoc.shared.SharedObjects;
import intradoc.shared.UserData;

public class PrintingNames extends ServiceHandler{
	public void printTheName() throws DataException, ServiceException
	{
		
	Log.info("Start printing name"+ true);
	String Docname = m_binder.getLocal("dDocName");
	String serviceName = "DOC_INFO_BY_NAME";
    String userName = m_binder.getLocal("dUser");
    Log.info("environment "+m_binder.getEnvironment());
    Log.info("shared obj val"+SharedObjects.getEnvironmentValue("IntradocServerPort"));
	DataBinder requestBinder = new DataBinder();
	requestBinder.putLocal("dDocName", Docname);
	requestBinder.putLocal("IdcService", serviceName);
	
	
	executeService(requestBinder,"sysadmin",false);	
    final ResultSet docinforesultset = requestBinder.getResultSet("DOC_INFO");
    DataResultSet docinfodataresultset = (DataResultSet)requestBinder.getResultSet("DOC_INFO");

 
	DataResultSet result = new DataResultSet();
	result.copy(docinforesultset);
	
	m_binder.putLocal("Message", "Name printed");
	m_binder.addResultSet("demo_resultset1", docinforesultset);
	m_binder.addResultSet("demo_resultset2", docinfodataresultset);
	Log.info("Finished printing name");

	}
	
	public void executeService(DataBinder binder, String userName, boolean suppressServiceError)
	        throws DataException, ServiceException
	    {       
	        ServiceException error;
	        Workspace workspace = getSystemWorkspace();
	        String cmd = binder.getLocal("IdcService");
	        if(cmd == null)
	            throw new DataException("!csIdcServiceMissing");
	        ServiceData serviceData = ServiceManager.getFullService(cmd);
	        if(serviceData == null)
	            throw new DataException(LocaleUtils.encodeMessage("!csNoServiceDefined", null, cmd));
	        Service service = ServiceManager.createService(serviceData.m_classID, workspace, null, binder, serviceData);
	        UserData fullUserData = getFullUserData(userName, service, workspace);
	        service.setUserData(fullUserData);
	        binder.m_environment.put("REMOTE_USER", userName);
	        error = null;
	        try
	        {
	            service.setSendFlags(true, true);
	            service.initDelegatedObjects();
	            service.globalSecurityCheck();
	            service.preActions();
	            service.doActions();
	            service.postActions();
	            service.updateSubjectInformation(true);
	            service.updateTopicInformation(binder);
	      
	        }
	        catch(ServiceException e)
	        {
	            error = e;
	        }
	        finally{
	        service.cleanUp(true);
	        workspace.releaseConnection();
	        }
	        if(error != null)
	            if(suppressServiceError)
	            {
	                error.printStackTrace();
	                if(binder.getLocal("StatusCode") == null)
	                {
	                    binder.putLocal("StatusCode", String.valueOf(error.m_errorCode));
	                    binder.putLocal("StatusMessage", error.getMessage());
	                }
	            } else
	            {
	                throw new ServiceException(error.m_errorCode, error.getMessage());
	            }
	        return;
	    }
	
	public UserData getFullUserData(String userName, ExecutionContext cxt, Workspace ws)
	        throws DataException, ServiceException
	    {
	        if(ws == null)
	            ws = getSystemWorkspace();
	        UserData userData = UserStorage.retrieveUserDatabaseProfileDataFull(userName, ws, null, cxt, true, true);
	        ws.releaseConnection();
	        return userData;
	    }
	
	public static Workspace getSystemWorkspace()
    {
        Workspace workspace = null;
        Provider wsProvider = Providers.getProvider("SystemDatabase");
        if (wsProvider != null)
        {
            workspace = (Workspace) wsProvider.getProvider();
        }
        return workspace;
    }
}

Happy coding with Vinay Kumar in Techartifact…..

October 13, 2013October 14, 2013

Update or edit existing Excel files in Java using Apache POI

Requirement -Programatically update an Excel spreadsheet in Java.

Solutions – Here an example of Apache POI to update a XLS workbook. Apache POI is a very good API , that can be handy in manipulating Excel documents.This tutorial focuses on XLS documents (Office 97 – 2003).

The existing excel file like below –

Below is code to update the excel file

import java.io.*;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.ss.usermodel.*;
import java.util.Iterator;
public class updateExcels {  

        public static void main(String[] args) throws Exception{
                
                FileInputStream fsIP= new FileInputStream(new File("C:\\TechartifactExcel.xls")); //Read the spreadsheet that needs to be updated
                 
                HSSFWorkbook wb = new HSSFWorkbook(fsIP); //Access the workbook
                 
                HSSFSheet worksheet = wb.getSheetAt(0); //Access the worksheet, so that we can update / modify it.
                 
                Cell cell = null; // declare a Cell object
               
                cell = worksheet.getRow(2).getCell(2);   // Access the second cell in second row to update the value
                 
                cell.setCellValue("OverRide Last Name");  // Get current cell value value and overwrite the value
                 
                fsIP.close(); //Close the InputStream
                
                FileOutputStream output_file =new FileOutputStream(new File("C:\\TechartifactExcel.xls"));  //Open FileOutputStream to write updates
                 
                wb.write(output_file); //write changes
                 
                output_file.close();  //close the stream    
        }
}

after updating excel file would look like below –

happy coding with Vinay in techartifact ….