Saturday, 28 February 2015

How To Create Servlet

How to create Servlet or call servlet

step 1:

create a index.jsp file or index.html file and make a form.

index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="Display" method="post">
first name:<input type="text" name="firstName"><br>
last name:<input type="text" name="lastName" ><br>
<input type="submit" value="submit">
</form>
</body>
</html>

Step 2:

Now create a servlet display.java

Display.java

package com.jsp.test;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class Display extends HttpServlet{



    /**
    *
    */
    private static final long serialVersionUID = 5346650776384140650L;

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String firstNAme=request.getParameter("firstName");
        String lastName=request.getParameter("lastName");
        PrintWriter out=response.getWriter();
        out.print("Welcome"+" "+firstNAme+" "+lastName);
        out.close();
    }

}

Step 3:

configure web.xml

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>JSP</display-name>
<welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
</welcome-file-list>

   <servlet>
    <servlet-name>Display</servlet-name>
    <servlet-class>com.jsp.test.Display</servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>Display</servlet-name>
    <url-pattern>/Display</url-pattern>
</servlet-mapping>

</web-app>

Friday, 27 February 2015

Servlet Tutorial

How To Create Servlet

JSP Tutorial

what is jsp

Batch Processing In Java(JDBC)

Sunday, 15 February 2015

The Interface And Class Hierarchy For Collection

The interface and class hierarchy for collection

The Interface And Class Hierarchy For Collection

Java ArrayList Examples

Java Linkedlist Examples

Java ArrayList Examples

Java Vector Examples

Java HashSet Examples

Java LinkedHashSet Examples

Java TreeSet Examples

Java Hashtable Examples

Java HashMap Examples

Java TreeMap Examples

Saturday, 14 February 2015

How To Read JSON In Java

How to read json file in java
Step 1:
Firstly download json-simple-1.1.1.jar .

Step2:
Add this jar in ellipse(this tutorial tells how to read json file in java using ellipse).

Step 3:

Now you try with code

How To Read JSON In Java (Set 1)

How To Read JSON In Java (Set 3)

How To Read JSON In Java (Set 2)

Friday, 13 February 2015

How To Read JSON In Java (Set 3)

user.json

{"employees":[
    {"firstName":"Rahul", "lastName":"Dhiman"},
    {"firstName":"Anna", "lastName":"Smith"},
    {"firstName":"MS", "lastName":"Dhoni"}
]}

TestJson.java

import java.io.FileReader;
import java.util.Iterator;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;

public class TestJsonset1 {
   public static void main(String[] args) {
       String filePath = "D:\\json\\user.json";
       try {
           FileReader reader = new FileReader(filePath);
           JSONParser jsonParser = new JSONParser();
           JSONObject jsonObject = (JSONObject) jsonParser.parse(reader);
           JSONArray lang= (JSONArray) jsonObject.get("employees");
           Iterator i=lang.iterator();
             while (i.hasNext()) {
               JSONObject jsonobject1=(JSONObject)i.next();
               System.out.println("first name="+jsonobject1.get("firstName")+"   last name="+jsonobject1.get("lastName"));
           }
       }catch (Exception e) {
               System.out.println(e);
           }
       }
}

Output:

first name=Rahul   last name=Dhiman
first name=Anna   last name=Smith
first name=MS   last name=Dhoni

How To Read JSON In Java (Set 2)

user.json

{"employees":[
    {"firstName":"Rahul", "lastName":"Dhiman"},
    {"firstName":"Anna", "lastName":"Smith"},
    {"firstName":"MS", "lastName":"Dhoni"}
]}

TestJson.java

import java.io.FileReader;
import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;

public class TestJson{
    public static void main(String[] args) {
        String filePath = "D:\\json\\user.json";
        try {
            FileReader reader = new FileReader(filePath);
            JSONParser jsonParser = new JSONParser();
            JSONObject jsonObject = (JSONObject) jsonParser.parse(reader);
            JSONArray lang= (JSONArray) jsonObject.get("employees");
            for (int i = 0; i < lang.size(); i++) {
             System.out.println(lang.get(i));
            }
        }catch (Exception e) {
                System.out.println(e);
            }
        }
}

Output:
{"firstName":"Rahul","lastName":"Dhiman"}
{"firstName":"Anna","lastName":"Smith"}
{"firstName":"MS","lastName":"Dhoni"}

Java Proficiency

Saturday, 28 February 2015

How To Create Servlet

Friday, 27 February 2015

Servlet Tutorial

JSP Tutorial

Sunday, 15 February 2015

The Interface And Class Hierarchy For Collection

Related Posts :

Java ArrayList Examples

Java ArrayList Examples

Saturday, 14 February 2015

How To Read JSON In Java

Friday, 13 February 2015

How To Read JSON In Java (Set 3)

How To Read JSON In Java (Set 2)