How to pass the value of variable to another java file?

Question

Hi. I have 2 java files (LogonAction.java and PCAction.java). The value of variable(String getrole) depends on the logon user. How can I use this value of variable in PCAction.java? I want to execute a sql statement in PCAction.java which is (String sql="Select * from PP where role"+"='" + getrole + "'") Thanks a lot.
LogonAction.java is below:
package test;
import test.jdbc.util.ConnectionPool;
import java.sql.*
import java.util.*;
import javax.servlet.http.*;
import org.apache.commons.logging.*;
import org.apache.struts.action.*;
import org.apache.struts.util.*;
import org.apache.commons.beanutils.PropertyUtils;
public final class LogonAction extends Action {
private Log log = LogFactory.getLog("org.apache.struts.webapp.Example");
private ConnectionPool pool;
public LogonAction() {
pool = ConnectionPool.getInstance();
public String getrole;
public ActionForward execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws Exception {
Locale locale = getLocale(request);
MessageResources messages = getResources(request);
ActionErrors errors = new ActionErrors();
String username = (String)PropertyUtils.getSimpleProperty(form, "username");
String password = (String)PropertyUtils.getSimpleProperty(form, "password");
String getusername=CheckUser(username,password);
getrole=getusername;
java.lang.System.out.println(getrole);
if ("".equals(getusername))
errors.add(ActionErrors.GLOBAL_ERROR,
new ActionError("error.password.mismatch"));
getusername=username+getusername;
// Report any errors we have discovered back to the original form
if (!errors.isEmpty()) {
saveErrors(request, errors);
return (mapping.getInputForward());
// Save our logged-in user in the session
HttpSession session = request.getSession();
session.setAttribute(Constants.USER_KEY, getusername);
if (log.isDebugEnabled()) {
log.debug("LogonAction: User '" + username +
"' logged on in session " + session.getId());
// Remove the obsolete form bean
if (mapping.getAttribute() != null) {
if ("request".equals(mapping.getScope()))
request.removeAttribute(mapping.getAttribute());
else
session.removeAttribute(mapping.getAttribute());
// Forward control to the specified success URI
return (mapping.findForward("success"));
* Look up the user, throwing an exception to simulate business logic
* rule exceptions.
* @param database Database in which to look up the user
* @param username Username specified on the logon form
* @exception ModuleException if a business logic rule is violated
public String CheckUser(String username,String password){
Connection con = null;
try
con = pool.getConnection();
String sql = "SELECT * from user WHERE userid = ? AND password= ?";
PreparedStatement ps = null;
ResultSet rs = null;
try {
if (con.isClosed()) {
throw new IllegalStateException("error.con.isClosed");
ps = con.prepareStatement(sql);
ps.setString(1,username);
ps.setString(2,password);
rs = ps.executeQuery();
String returnstr="";
while(rs.next())
returnstr=rs.getString("role");
java.lang.System.out.println(returnstr);
return returnstr;
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException("error.ps.executeQuery");
} finally {
try {
if (ps != null)
ps.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException("error.rs.close");
catch (SQLException e)
e.printStackTrace();
throw new RuntimeException("Unable to get connection.");
finally
try
if (con != null)
con.close();
catch (SQLException e)
throw new RuntimeException(e.getMessage());
}

Answer 1

You can use PreparedStatement and
String cmd = "select * from PP where role=?";
PreparedStatement stmt = conn.prepareStatement(cmd);
stmt.setString(1,theRole);