java server pages doc 18 july 2007

8/3/2019 Java Server Pages Doc 18 July 2007

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DBQueryTag.java

// DBQueryTag.java

package dbquery;

import javax.servlet.jsp.*;

import javax.servlet.jsp.tagext.*;

import java.io.*;

import java.sql.*;

public class DBQueryTag extends TagSupport

{

String driver, url, user, pass, query;

public void setDriver(String d)

{

driver=d;

}

public void setUrl(String u)

{

url=u;

}

public void setUser(String u)

{user=u;

}

public void setPass(String p)

{

pass=p;

}

public void setQuery(String q)

{

query=q;

}

public int doStartTag() throws JspException

{

System.out.println("doStartTag()");

try

{

JspWriter out=pageContext.getOut();

Class.forName(driver);

Connection con=DriverManager.getConnection(url, user, pass);

Statement stmt=con.createStatement();

ResultSet rs=stmt.executeQuery(query);

ResultSetMetaData meta=rs.getMetaData();

int colCount=meta.getColumnCount();

out.println("");

while(rs.next())

{

out.println("");

for(int i=1;i


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}//try

catch(Exception e) {

e.printStackTrace();

}// catch()

return SKIP_BODY;

}// doStartTag()

}// class

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/*http://localhost:7001/dbquery/DBQueryTest.htmlhttp://localhost:8080/dbquery/DBQueryTest.html

SELECT * FROM emp

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EMPNO ENAME DeptNo

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1 |ABC |10 |---------------------------------------

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(/,!

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// TransferMoneyTag.java

package bank;import javax.servlet.jsp.*;


import java.io.*;

import javax.sql.*;

import java.sql.*;

import javax.naming.*;

import java.util.*;

public class TransferMoneyTag extends TagSupport

{

JspWriter out;

Hashtable ht;

Context ctxt;

DataSource ds;

Connection con;Statement stmt;

private String datasource, table;

public int source, dest;

public double amt;

boolean flag;

public void setDatasource(String ds)

{

datasource=ds;

}

public void setTable(String t)

{

table=t;}


{

try

{

out=pageContext.getOut();

out.println("");

}

catch(Exception e){}

return EVAL_BODY_INCLUDE;

}// doStartTag()

public int doAfterBody() throws JspException

{try

{

ht=new Hashtable();

ht.put(Context.INITIAL_CONTEXT_FACTORY,

"weblogic.jndi.WLInitialContextFactory");

ht.put(Context.PROVIDER_URL, "t3://localhost:7001");

ctxt=new InitialContext(ht);

ds=(DataSource)ctxt.lookup(datasource);


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con=ds.getConnection();

stmt=con.createStatement();

pageContext.setAttribute("CONN", con, pageContext.PAGE_SCOPE);

int i=stmt.executeUpdate("update "+table+" set bal=bal-"+amt+" where

accNo="+source);

int j=stmt.executeUpdate("update "+table+" set bal=bal+"+amt+" where

accNo="+dest);

if(i==1 && j==1)

flag=true;

else

flag=false;

stmt.close();

out.println("TX successful");

}// try

catch(Exception e){e.printStackTrace();}

return SKIP_BODY;

}// doAfterBody()

public int doEndTag() throws JspException

{

out.println("");if(flag)

return EVAL_PAGE;

else

return SKIP_PAGE;

}// doEndTag()

}// class

// SourceTag.java

package bank;



public class SourceTag extends BodyTagSupport

{


{

Tag tag=getParent();

TransferMoneyTag tmtag=(TransferMoneyTag)tag;

tmtag.source=value;

return SKIP_BODY;

}// doStartTag()

int value;

public void setValue(int v)

{

value=v;

}

}// class

// AmtTag.java

package bank;



public class AmtTag extends BodyTagSupport

{

private double value;

public void setValue(double v)

{


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}// if()

}// try

catch(Exception e)

{

e.printStackTrace();

}// catch()

return SKIP_BODY;

}// doStartTag()

}// class

transferMoney

bank.TransferMoneyTag

JSP

datasource

true

false

table

true

false

source

bank.SourceTag

empty

value

true

false

amt

bank.AmtTag

empty

value

true

false

dest

bank.DestTag

empty

value

true

false


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balance

bank.BalanceTag

empty

accNo

true

false

tm-uri

/WEB-INF/tm.tld

Ninth application

Source

Amount

Dest


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http://localhost:7001/tm/TransferMoneyForm.html

java server pages doc 18 july 2007

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