Write file in java | simple file write in java

package com.jignesh;

import java.io.File;

public class WriteFileExample
{
    public static void main(String[] args)
    {
     try{

      File file = new File("c:\\jigneshExample.txt");

          if (!file.exists()) {
                file.createNewFile();
            }

            FileWriter fw = new FileWriter(file.getAbsoluteFile());
            BufferedWriter bw = new BufferedWriter(fw);
            bw.write("hello how are you!");
            bw.close();


     }catch(Exception e){

      e.printStackTrace();

     }

    }
}

How to Delete File in java | Delete file

package com.jignesh;

import java.io.File;

public class DeleteFileExample
{
    public static void main(String[] args)
    {
     try{

      File file = new File("c:\\jigneshExample.txt");

      if(file.delete()){
       System.out.println(file.getName() + " is deleted!");
      }else{
       System.out.println("Delete operation is failed.");
      }

     }catch(Exception e){

      e.printStackTrace();

     }

    }
}

WEB CRAWLER USING JAVA | WEB CRAWLER IN JAVA

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package com.jignesh;

import java.net.*;
import java.io.*;

/**
 *
 * @author jignesh kanjariya
 * mo: +918905388832
 */

public class Crawler {

    public static void main(String[] args) throws Exception {
        String urls[] = new String[1000];
        String url = "http://www.google.co.in";
        int i = 0, j = 0, tmp = 0, total = 0, MAX = 1000;
        int start = 0, end = 0;
        String webpage = Web.getWeb(url);
       
        end = webpage.indexOf("<body");
        for (i = total; i < MAX; i++, total++) {
            start = webpage.indexOf("http://", end);
            if (start == -1) {
                start = 0;
                end = 0;
                try {
                    webpage = Web.getWeb(urls[j++]);
                } catch (Exception e) {
                    System.out.println("******************");
                    System.out.println(urls[j - 1]);
                    System.out.println("Exception caught \n" + e);
                }

                /*logic to fetch urls out of body of webpage only */
                end = webpage.indexOf("<body");
                if (end == -1) {
                    end = start = 0;
                    continue;
                }
            }
            end = webpage.indexOf("\"", start);
            tmp = webpage.indexOf("'", start);
            if (tmp < end && tmp != -1) {
                end = tmp;
            }
            url = webpage.substring(start, end);
            urls[i] = url;
            System.out.println(urls[i]);
        }
        System.out.println("Total URLS Fetched are " + total);
    }
}

class Web {

    public static String getWeb(String address) throws Exception {
        String webpage = "";
        String inputLine = "";
        URL url = new URL(address);
        BufferedReader in = new BufferedReader(
                new InputStreamReader(url.openStream()));
        while ((inputLine = in.readLine()) != null) {
            webpage += inputLine;
        }
        in.close();
        return webpage;
    }
}

Find() in MongoDB Examples

 Find() examples

1.1 Get first matched document only.

DBObject doc = collection.findOne();

 
System.out.println(dbObject);

Output

{ "_id" : { "$oid" : "id"} , "number" : 1 , "name" : "jignesh-1"}

1.2 Get all matched documents.

DBCursor cursor = collection.find();
while(cursor.hasNext()) 

{
    System.out.println(cursor.next());
}

Output

{ "_id" : { "$oid" : "id"} , "number" : 1 , "name" : "jignesh-1"}
{ "_id" : { "$oid" : "id"} , "number" : 2 , "name" : "jignesh-2"}
{ "_id" : { "$oid" : "id"} , "number" : 3 , "name" : "jignesh-3"}
 

1.3 Get single field from matched document.

BasicDBObject allQuery = new BasicDBObject();
BasicDBObject fields = new BasicDBObject();
fields.put("name", 1);

DBCursor cursor = collection.find(allQuery, fields);

 
while (cursor.hasNext()) 

{
 System.out.println(cursor.next());
}

Output

{ "_id" : { "$oid" : "id"} , "name" : "jignesh-1"}
{ "_id" : { "$oid" : "id"} , "name" : "jignesh-2"}
{ "_id" : { "$oid" : "id"} , "name" : "jignesh-3"}

Move war file from Netbeans to Tomcat 8 | Upload Netbeans project to tomcat 8

 Move war file from Netbeans to Tomcat 8.

you want to run this application in tomcat without use Netbeans IDE, do these things describing below.

First open Netbeans IDE and right click on project name and choose Clear and 
Build.


Go to dist folder with your project files in NetbeansProjects catalogue. In my system it is in My Documents folder. Copy WebApps.war file.

Go to the webapps folder in your tomcat instalation folder and paste this file in it.

Then open console and go to tomcat 8  installation catalogue and write startup command. Type Enter.

The Tomcat 8 server is running.

Open browser and type in address field http://locahost:9090/WebApp.

The application is running. If you want stop server, write in console in tomcat installation folder shutdown command.

Another way for move application from Netbeans IDE is Manager App in tomcat.
So delete from webapps WebApp.war file and from D:\tomcat8\conf\Catalina\localhost WebApp.xml file – configuration file of WebApp application.
Run tomcat 8 from console as before,

open browser and type in it address:
http://locahost:9090/

Click the Manager App button.
The server ask You for user and password, so write in it user as tomcat and password as tomcat. These atat are configured in tomcat-users.xml file in conf tomcat folder.

Click the OK button.
You see list of all applications and tools.

Go to WAR file to deploy section and browse WebApp.war file from C:\Users\admin\Documents\NetBeansProjects\WebApp\dist.

Click the Deploy button to move application war file into tomcat webapps folder.

Click on WebApp link to your application. The application will be display.

In webapps folder in tomcat you see WebApp.war file and unpacked webapp catalogue for this application, but D:\tomcat8\conf\Catalina\localhost folder will be empty.
So if you copy war file from Netbeans and paste it into webapps folder, in tomcat will be creating in D:\tomcat8\conf\Catalina\localhost configuration file: WebApp.xml,
but if you browse war file from Manager App in tomcat and deploy this application, in webapps folder in tomcat will be unpacked war archive as webapp catalogue.

create java RESTful client with Jersey client

package com.jignesh;

import com.google.gson.Gson;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import javax.ws.rs.core.MediaType;


/**
 *
 * @author jignesh kanjariya
 */

public class JerseyClient {
   
    public static void main(String[] args) {

        jerseyPojo jPojo = new jerseyPojo();
       
        jPojo.setUrl("http://localhost:8084/corpository2/api/mobileapp/1.0/companies/documet");
        jPojo.setInput("{\"apikey\":\"AAzzxsfsgTmvLitnzQRseT\",\"company-ids\":\"45304\"}");
       
        testDoRegister(jPojo.getUrl(),jPojo.getInput());
    }

    private static void testDoRegister(String url,String input) {
  
      try {
         
     URL url1 = new URL(url);
            System.out.println(url1);      
     HttpURLConnection conn = (HttpURLConnection) url1.openConnection();
          
            conn.setDoOutput(true);
            conn.setRequestMethod("POST");
            conn.addRequestProperty("Content-type", "application/json");
           // String input = "{\"apikey\":\"AAzzxsfsgTmvLitnzQRseT\",\"company-ids\":\"45304\"}";
            System.out.println("I: " + input);
            OutputStream os = conn.getOutputStream();
            os.write(input.getBytes());
            os.flush();
            BufferedReader br = new BufferedReader(new InputStreamReader(
                    (conn.getInputStream())));
            String output;
            System.out.print("O: ");
            while ((output = br.readLine()) != null) {
                System.out.println(output);
               
            }
            conn.disconnect();
        }catch (Exception e) {
   
        }

       
    }

    }

How to Restoring MySQL Database

Restoring your MySQL Database

• Create an appropriately named database on the target machine
• Load the file using the mysql command:

$ mysql -u [uname] -p[pass] [db_to_restore] < [backupfile.sql]

 

Have a look how you can restore your tut_backup.sql file to the Tutorials database.

$ mysql -u root -p Tutorials < tut_backup.sql

 

To restore compressed backup files you can do the following:

gunzip < [backupfile.sql.gz] | mysql -u [uname] -p[pass] [dbname]

 

If you need to restore a database that already exists, you'll need to use mysqlimport command. The syntax for mysqlimport is as follows:

mysqlimport -u [uname] -p[pass] [dbname] [backupfile.sql]