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JSP EL – Accessing Collection

22 Mar

EL\WEB-INF\classes\CollectionDemo.java

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
public class CollectionDemo extends HttpServlet
{
    public void doGet(HttpServletRequest req,HttpServletResponse res) throws ServletException, IOException
    {
        String weekdays[] = {"MON","TUE","WED","THU","FRI","SAT","SUN"};
         
        List cl = new ArrayList();
        cl.add("Rajkot");
        cl.add("Surat");
        cl.add("Ahmedabad");
        cl.add("Morbi");
		      
        Map student = new HashMap();
        student.put("fnm","Ram");
        student.put("lnm","Sita");
            
        HttpSession session = req.getSession();
        session.setAttribute ("wd",weekdays);
        session.setAttribute ("city",cl);
        session.setAttribute ("stud",student);
         
        RequestDispatcher rd = req.getRequestDispatcher("/WEB-INF/CollectionDemo.jsp");
        rd.forward(req,res);
    }
}

EL\WEB-INF\CollectionDemo.jsp

${wd[0]}<br>
${city[0]} ${city[1]}<br>
${stud["fnm"]} ${stud["lnm"]}
 
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Posted by on March 22, 2016 in Example

 

JSP EL – Accessing Bean SubProperty

22 Mar

EL\WEB-INF\source\NameBean.java

package p1;
public class NameBean
{
	private String firstname="Missing first name";
	private String lastname="Missing last name";
	
	public NameBean(String firstName, String lastName) 
	{
		setFirstName(firstName);
		setLastName(lastName);
    }
	public void setFirstName(String fn)
	{
		firstname=fn;
	}
	public void setLastName(String ln)
	{
		lastname=ln;
	}
	public String getFirstName()
	{
		return firstname;
	}
	public String getLastName()
	{
		return lastname;
	}
}

EL\WEB-INF\source\CompanyBean.java

package p1;
public class CompanyBean
{
	private String companyname,business;
	public CompanyBean(String companyName, String business) 
	{
		setCompanyName(companyName);
		setBusiness(business);
	}
	public void setCompanyName(String newCompanyName) 
	{
		companyname = newCompanyName;
	}
	public void setBusiness(String newBusiness) 
	{
		business = newBusiness;
	}
	public String getCompanyName() 
	{ 
		return(companyname); 
	}
	public String getBusiness() 
	{ 
		return(business);
	}	
}

EL\WEB-INF\source\EmployeeBean.java

package p1;
public class EmployeeBean 
{
	private  NameBean name;
	private CompanyBean company;
	public EmployeeBean(NameBean name, CompanyBean company) 
	{
		setName(name);
		setCompany(company);
	}
	public void setName(NameBean obj)
	{
		name=obj;
	}
	public void setCompany(CompanyBean obj)
	{
		company=obj;
	}
	
	public NameBean getName()
	{
		return name;
	}
	public CompanyBean getCompany()
	{
		return company;
	}
	
	
}

EL\WEB-INF\source\Test.java

package p1;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class Test extends HttpServlet
{
	public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException 
	{
		NameBean nobj=new NameBean("Marty","Hall");
		CompanyBean cobj=new CompanyBean("coreservlet.com","J2EE Training and consulting");
		
		EmployeeBean eobj=new EmployeeBean(nobj,cobj);
		
		request.setAttribute("employee", eobj);
		request.setAttribute("company",cobj);
		request.setAttribute("name",nobj);
	
		RequestDispatcher dispatcher = request.getRequestDispatcher("/EL.jsp");
		dispatcher.forward(request, response);

	}
}

EL\EL.jsp

FirstName :  ${employee.name.firstName}
LastName :  ${employee.name.lastName}
Company Name : ${ employee.company.companyName} 
Business :  ${ employee.company.business}
<br>
From NameBean :  <br>
${name.firstName}
${name.lastName} <br>
From CompanyBean <br>
${company.companyName}
${company.business}
 
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Posted by on March 22, 2016 in Example

 

JSP EL : Accessing JSP Scoped Variable

22 Mar

EL\WEB-INF\classes\ScopeVar.java

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class ScopeVar extends HttpServlet
{
	public void doGet(HttpServletRequest req,HttpServletResponse res) throws IOException,ServletException
	{
		res.setContentType("text/html");
		PrintWriter out=res.getWriter();
		
		req.setAttribute("attribute1","request");
		
		HttpSession session=req.getSession();
		session.setAttribute("attribute2","session");
		
		ServletContext  a=getServletContext();
		a.setAttribute("attribute3","application");
		
		
		req.setAttribute("repeat","request1");
		session.setAttribute("repeat","session1");
		a.setAttribute("repeat","application1");
		
		
		RequestDispatcher rd=req.getRequestDispatcher("result.jsp");
		rd.forward(req,res);

	}
}

EL\result.jsp

Request  scope : ${attribute1}
Session scope  : ${attribute2}
Application scope  : ${attribute3}
	<br>
	
<%-- If Key are same then priority(scope) will be as per following order :
1) page
2) request
3) session
4) application	 --%>
same Key : 	
	${repeat}
<br>	
to access same key from different Scope : 

	${requestScope.repeat}
	${sessionScope.repeat}
	${applicationScope.repeat}
 
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Posted by on March 22, 2016 in Example

 

MVC Example -3

21 Mar

StudMVC\datainput.html

<html>
	<body>
		<form action="test.do" method="post">
			Roll No:
			<select name="rno">
				<option>1</option>
				<option>2</option>
				<option>3</option>
				<option>4</option>
				<option>5</option>
			</select> 
			<input type="submit" value="submit">
		</form>
	</body>
</html>

StudMVC\WEB-INF\web.xml

<web-app ....>
  <display-name>Welcome to Tomcat</display-name>
  <description>
     Welcome to Tomcat
  </description>
	<servlet>
	<servlet-name>t</servlet-name>
		<servlet-class>controller.control</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>t</servlet-name>
		<url-pattern>/test.do</url-pattern>
	</servlet-mapping>
</web-app>

StudMVC\WEB-INF\source\control.java

package controller;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import model.*;

public class control extends HttpServlet
{
	public void doPost(HttpServletRequest req,HttpServletResponse res) throws ServletException,IOException
	{
		res.setContentType("text/html");
		PrintWriter out=res.getWriter();
		
		String rno=req.getParameter("rno");
		
		
		Bean b=new Bean();
		b=b.getDetail(rno);
		
		int total=b.getM1()+b.getM2() + b.getM3();
		out.println("total " + total);
		double per=total/3;
		
		req.setAttribute("Result",b);
		req.setAttribute("total",total);
		req.setAttribute("per",per);
		
		
		String URL;
		if(per <50 )
			URL="WEB-INF/LessResult.jsp";
		else
			URL="WEB-INF/MoreResult.jsp";
		
		RequestDispatcher rd=req.getRequestDispatcher(URL);
		rd.forward(req,res); 
		
	}
}

StudMVC\WEB-INF\MoreResult.jsp

<body bgcolor="BLUE"> 

Student Data : 
<jsp:useBean id="Result" type="model.Bean" scope="request" />
Roll no : <jsp:getProperty name="Result" property="rollno" /> </br>
Name : <jsp:getProperty name="Result" property="name" /> </br>
M1 : <jsp:getProperty name="Result" property="m1" /> </br>
M2 : <jsp:getProperty name="Result" property="m2" /> </br>
M3 : <jsp:getProperty name="Result" property="m3" /> </br>

<%
	out.println("Total  : "+request.getAttribute("total") + "<br>");
	out.println("Percentage : " +request.getAttribute("per"));
%>
</body>

StudMVC\WEB-INF\LessResult.jsp

<body bgcolor="RED"> 

Student Data : 
<jsp:useBean id="Result" type="model.Bean" scope="request" />
Roll no : <jsp:getProperty name="Result" property="rollno" /> </br>
Name : <jsp:getProperty name="Result" property="name" /> </br>
M1 : <jsp:getProperty name="Result" property="m1" /> </br>
M2 : <jsp:getProperty name="Result" property="m2" /> </br>
M3 : <jsp:getProperty name="Result" property="m3" /> </br>

<%
	out.println("Total  : "+request.getAttribute("total") + "<br>");
	out.println("Percentage : " +request.getAttribute("per"));
%>
</body>

StudMVC\WEB-INF\source\Bean.java

package model;
import java.util.*;
public class Bean
{
		private int rno;
		private String name;
		private int m1,m2,m3;

		public Bean()
		{
			
		}
		public Bean(int rollno,String name,int m1,int m2,int m3)
		{
			
			rno=rollno;
			this.name=name;
			this.m1=m1;
			this.m2=m2;
			this.m3=m3;
		}
		
		public Bean getDetail(String key)
		{
				
			HashMap mp=new HashMap();
			mp.put("1",new Bean(1,"Ram",76,86,87));
			mp.put("2",new Bean(2,"Sita",52,65,73));
			mp.put("3",new Bean(3,"Laxman",65,75,53));
			mp.put("4",new Bean(4,"Hanuman",32,35,23));
			mp.put("5",new Bean(5,"Bharat",42,55,63));
			
			return ((Bean)mp.get(key));
		}
		public int getRollno()
		{
			return rno;
		}
		public String getName()
		{
			return name;
		}
		public int getM1()
		{
			return m1;
		}
		public int getM2()
		{
			return m2;
		}
		public int getM3()
		{
			return m3;
		}
}
 
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Posted by on March 21, 2016 in Example

 

Model View Controller (MVC) (Example-2)

19 Mar

MVC\datainput.html

<html>
<body>
<form action="test.do">
Enter your emp no : 
<select name="emp">
	<option value="1"> 1</option>
	<option value="2"> 2 </option>
</select>
<input type="submit" value="ok"/>
</form>
</body>
</html>

MVC\WEB-INF\source\Control.java

package controller;

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import model.*;

public class Control extends HttpServlet
{
	public void doGet(HttpServletRequest req,HttpServletResponse res) throws ServletException, IOException
	{
		res.setContentType("text/html");
		PrintWriter out=res.getWriter();
		
		String s=req.getParameter("emp");
		
		Bean b=new Bean();
		b=b.getDetail(s);
		
		
		req.setAttribute("Result",b);
		
		RequestDispatcher rd=req.getRequestDispatcher("WEB-INF/Result.jsp");
		rd.forward(req,res);
	
	}
}

MVC\WEB-INF\source\Bean.java

package model;
import java.util.*;

public class Bean
{
	private int empno=3;
	private String fn="mca",ln="4c";
	private float salary=100;
	
	public Bean()
	{
	}
	public Bean(int eno,String firstname,String lastname, float salary)
	{
		empno=eno;
		fn=firstname;
		ln=lastname;
		this.salary=salary;
	}
	
	public Bean getDetail(String key)
	{
		HashMap m=new HashMap();
		m.put("1",new Bean(1,"abc","xyz",25000f));
		m.put("2",new Bean(2,"pqr","mno",26000f));
		
		
		return ((Bean)m.get(key));
	}
	
	public String getFirstName()
	{
		return fn;
	}
	public String getLastName()
	{
		return ln;
	}
	
	public int getEmpno()
	{
		return empno;
	}
	public float getSalary()
	{
		return salary;
	}
	
}

MVC\WEB-INF\Result.jsp

<%@page import="model.Bean" %>
Using JAVA: 
<%
Bean b=(Bean)request.getAttribute("Result");
out.println(b.getEmpno());
out.println(b.getFirstName());
out.println(b.getLastName());
out.println(b.getSalary());

%>
</br>
Using Bean: 
<jsp:useBean id="Result" type="model.Bean" scope="request"/>
<jsp:getProperty name="Result" property="empno" />
<jsp:getProperty name="Result" property="firstName" /> 
<jsp:getProperty name="Result" property="lastName" />
<jsp:getProperty name="Result" property="salary" />

</br>
using EL :
${Result.empno}
${Result.firstName}
${Result.lastName}
${Result.salary}

web.xml

<?xml version="1.0" encoding="ISO-8859-1"?>

<web-app ..>

  <display-name>Welcome to Tomcat</display-name>
  <description>
     Welcome to Tomcat
  </description>
	<servlet>
		<servlet-name>t</servlet-name>
		<servlet-class>controller.Control</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>t</servlet-name>
		<url-pattern>/test.do</url-pattern>
	</servlet-mapping>
</web-app>
 
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Posted by on March 19, 2016 in Example

 

Model View Controller (MVC) ( Example-1)

17 Mar

MVC/datainput.html

<html>
<body>
<form action="test.do">
	Enter your semester: 
	<select name="sem">
		<option value="sem3">Sem3 </option>
		<option value="sem4">Sem4 </option>
	</select>
	<input type="submit" value="ok" />
</form>
</body>
</html>

MVC/WEB-INF/web.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app ... >

  <display-name>Welcome to Tomcat</display-name>
  <description>
     Welcome to Tomcat
  </description>
	<servlet>
		<servlet-name>test</servlet-name>
		<servlet-class>controller.control</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>test</servlet-name>
		<url-pattern>/test.do</url-pattern>
	</servlet-mapping>
</web-app>

MVC/WEB-INF/source/Bean.java

package model;
import java.util.*;
public class Bean 
{	
	private List subjects;
	
	public List getSubjectList(String sem)
	{
		subjects=new ArrayList();
		if(sem.equals("sem3"))
		{
			subjects.add("SM");
			subjects.add("OS");
		}
		if(sem.equals("sem4"))
		{
			subjects.add("WTAD");
			subjects.add("OR");
		}
		return subjects;
	}
}

MVC/WEB-INF/source/control.java

package controller;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import model.*;

public class control extends HttpServlet
{
	public void doGet(HttpServletRequest req,HttpServletResponse res)throws ServletException,IOException
	{
		res.setContentType("text/html");
		PrintWriter out= res.getWriter();
		
		String sem=req.getParameter("sem");
		Bean b=new Bean();
		List l=b.getSubjectList(sem);
		
		req.setAttribute("list",l);
		RequestDispatcher rd=req.getRequestDispatcher("WEB-INF/Result.jsp");
		rd.forward(req,res); 
	}
}

To compile the javacode :
WEB-INF> javac -d ./classes source/*.java

/MVC/WEB-INF/Result.jsp

<%@page import="java.util.*" %>
<%
List result=(List)request.getAttribute("list");
for(int i=0;i<result.size();i++)
{
	out.println(result.get(i));
} 
%>
 
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Posted by on March 17, 2016 in Example

 

<jsp:setProperty> param attribute

29 Feb

data2.html

<html>
<body>
<form action="beanprocess2.jsp">
Enter Name :  
<input type="text" name="nm">
Enter Age : 
<input type="text" name="age">
Enter Gender : 
<input type="radio" name="g" value="male"> Male
<input type="radio" name="g" value="female"> FeMale
<input type="submit" value="OK">
</form>
</body>
</html>

StudentInformation.java

package p1;
public class StudentInformation
{
	int age;
	String name;
	String gender ;
	
	
	public void setAge(int age)
	{	
		this.age=age;
	}
	public void setName(String name)
	{
		this.name=name;
	}
	public void setGender(String gender)
	{
		this.gender=gender;
	}
	public int getAge()
	{
		return age;
	}
	public String getName()
	{	
		return name;
	}
	public String getGender()
	{
		return gender;
	}
}

beanprocess2.jsp

<jsp:useBean id="studbean" class="p1.StudentInformation" /> 

<jsp:setProperty name="studbean" property="name" param="nm" />
<jsp:setProperty name="studbean" property="age" param="age" />
<jsp:setProperty name="studbean" property="gender" param="g" />



Name :  
<jsp:getProperty name="studbean" property="name" />

Age : 
<jsp:getProperty name="studbean" property="age" />

Gender : 
<jsp:getProperty name="studbean" property="gender" />
 
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Posted by on February 29, 2016 in Example

 

<jsp:setProperty> – * as property attribute value

29 Feb

StudentInformation.java

package p1;
public class StudentInformation
{
	int age;
	String name;
	String gender ;
	
	
	public void setAge(int age)
	{	
		this.age=age;
	}
	public void setName(String name)
	{
		this.name=name;
	}
	public void setGender(String gender)
	{
		this.gender=gender;
	}
	public int getAge()
	{
		return age;
	}
	public String getName()
	{	
		return name;
	}
	public String getGender()
	{
		return gender;
	}
}

data1.html

<html>
<body>
<form action="beanprocess1.jsp">
Enter Name :  
<input type="text" name="name">
Enter Age : 
<input type="text" name="age">
Enter Gender : 
<input type="radio" name="gender" value="male"> Male
<input type="radio" name="gender" value="female"> FeMale
<input type="submit" value="OK">
</form>
</body>
</html>

beanprocess1.jsp

<jsp:useBean id="studbean" class="p1.StudentInformation" /> 

<jsp:setProperty name="studbean" property="*" />

Name :  
<jsp:getProperty name="studbean" property="name" />

Age : 
<jsp:getProperty name="studbean" property="age" />

Gender : 
<jsp:getProperty name="studbean" property="gender" />
 
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Posted by on February 29, 2016 in Example

 

<jsp:useBean> action example to store form data to bean

29 Feb

store form data to bean
C:\xampp\tomcat\webapps\Bean\WEB-INF\classes\StudentInformation.java

package p1;
public class StudentInformation
{
	int age;
	String name;
	String gender ;
	
	
	public void setAge(int age)
	{	
		this.age=age;
	}
	public void setName(String name)
	{
		this.name=name;
	}
	public void setGender(String gender)
	{
		this.gender=gender;
	}
	public int getAge()
	{
		return age;
	}
	public String getName()
	{	
		return name;
	}
	public String getGender()
	{
		return gender;
	}
}

C:\xampp\tomcat\webapps\Bean\data.html

<html>
<body>
<form action="beanprocess.jsp">
Enter Name :  
<input type="text" name="nm">
Enter Age : 
<input type="text" name="age">
Enter Gender : 
<input type="radio" name="g" value="male"> Male
<input type="radio" name="g" value="female"> FeMale
<input type="submit" value="OK">
</form>
</body>
</html>

C:\xampp\tomcat\webapps\Bean\beanprocess.jsp

<jsp:useBean id="studbean" class="p1.StudentInformation" /> 

<jsp:setProperty name="studbean" property="name" value='<%=request.getParameter("nm")%>' />
<jsp:setProperty name="studbean" property="age" value='<%=Integer.parseInt(request.getParameter("age"))%>'/>
<jsp:setProperty name="studbean" property="gender" value='<%=request.getParameter("g")%>' />


Name :  
<jsp:getProperty name="studbean" property="name" />

Age : 
<jsp:getProperty name="studbean" property="age" />

Gender : 
<jsp:getProperty name="studbean" property="gender" />
 
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Posted by on February 29, 2016 in Example

 

<jsp:useBean> Action Example to create simple Bean

29 Feb

C:\xampp\tomcat\webapps\Bean\WEB-INF\classes\StudInfo.java

package p1;
public class StudInfo
{
 private String name = "";
 public void setName(String name)
 {
 this.name = name;
 }
 public String getName()
 {
 return (name);
 }
}

Compile these file using :
C:\xampp\tomcat\webapps\Bean\WEB-INF\classes>javac -d . StudInfo.java
these command create folder p1 and place StudInfo.class file in that.

C:\xampp\tomcat\webapps\Bean\SimpleBean.jsp

<jsp:useBean id="studBean" class="p1.StudInfo"/>
<jsp:setProperty name="studBean" property="name" value="abc"/>
Name : <jsp:getProperty name="studBean" property="name"/>
<% studBean.setName("xyz");
out.println("<br>Name = "+ studBean.getName()); %>
 
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Posted by on February 29, 2016 in Example

 
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