populating text box using jsp code

dependentDropdown.jsp:

<%@ page language="java" %>
<%@ page import="java.sql.*" %>
<script>

function change(){
var cid=document.getElementById("book").selectedIndex;
var val = document.getElementById("book").options[cid].text;
window.location.replace("http://localhost:8080/examples/jsp/dependentDropdown.jsp?id="+cid+"&&value="+val);
}
function extract(){
var ide=document.getElementById("info").selectedIndex;
var bookname = document.getElementById("info").options[ide].text;
window.location.replace("http://localhost:8080/examples/jsp/dependentDropdown.jsp?book="+bookname);
}
</script>
<%!
Connection conn = null;
ResultSet rs =null;
Statement st=null;
String query="";

%>
<%
String value=request.getParameter("value");
Class.forName("com.mysql.jdbc.Driver").newInstance();
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/register","root";, "root");
st = conn.createStatement();
rs = st.executeQuery("select * from book");
%>
<select id="book" onchange="change();">
<option value="0">--Please Select--</option>
<% while(rs.next()){ %>
<option value="<%=rs.getString("books")%>"><%=rs.getString("books")%></option>
<% if(rs.getString("books").equals(value)){%>
<option value="<%=value%>" selected disabled><%=value%></option>
<%
}
}
%>
</select>
<select id="info" onchange="extract(this)">
<option value="0">--Please Select--</option>
<%
String id=request.getParameter("id");
rs=st.executeQuery("select * from bookInformation where bookid='"+id+"'");
while(rs.next()){
%>
<option value="<%=rs.getString("id")%>" ><%=rs.getString("booknames")%></option>
<%
}
%>
</select>
<%
String book=request.getParameter("book");
String author="";
String price="";
rs=st.executeQuery("select * from bookInformation where booknames='"+book+"'");
while(rs.next()){
author=rs.getString("writer");
price=rs.getString("price");
}
if((book!=null)&&(author!=null)&&(price!=null)){
%>
<table >
<tr><td>Book Name</td><td><input type="text" value="<%=book%>"></td></tr>
<tr><td>Author</td><td><input type="text" value="<%=author%>"></td></tr>
<tr><td>Price</td><td><input type="text" value="<%=price%>"></td></tr>
</table>
<%
}
%>
</body>
</html>

For the above code, we have used following database tables:

1)book

CREATE TABLE `book` (
`bookid` bigint(20) NOT NULL auto_increment,
`books` varchar(255) default NULL,
PRIMARY KEY (`bookid`)
)

2)bookinformation

CREATE TABLE `bookinformation` (
`id` bigint(255) NOT NULL auto_increment,
`bookid` int(255) default NULL,
`booknames` varchar(255) default NULL,
`writer` varchar(255) default NULL,
`Price` double default NULL,
PRIMARY KEY (`id`)
)