employeelistaction.java

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package com.wiley;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionError;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.Statement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.ArrayList;

public class EmployeeListAction extends Action {

  protected ArrayList getEmployees() {

    Employee employee = null;
    ArrayList employees = new ArrayList();
    Connection conn = null;
    Statement stmt = null;
    ResultSet rs = null;

    ServletContext context = servlet.getServletContext();
    DataSource dataSource = (DataSource)
      context.getAttribute(Action.DATA_SOURCE_KEY);

    try {

      conn = dataSource.getConnection();
      stmt = conn.createStatement();
      rs =
        stmt.executeQuery("select * from employees, roles, "
        + "departments where employees.roleid=roles.roleid "
        + "and employees.depid=departments.depid");

      while ( rs.next() ) {

        employee = new Employee();

        employee.setUsername(rs.getString("username"));
        employee.setName(rs.getString("name"));
        employee.setRolename(rs.getString("rolename"));
        employee.setPhone(rs.getString("phone"));
        employee.setEmail(rs.getString("email"));
        employee.setRoleid(new Integer(rs.getInt("roleid")));
        employee.setDepid(new Integer(rs.getInt("depid")));
        employee.setDepartment(rs.getString("depname"));

        employees.add(employee);

        System.err.println("Username : "
          + employee.getUsername()
          + " Department : " + rs.getString("depname"));
      }
    }
    catch (SQLException e) {

      System.err.println(e.getMessage());
    }
    finally {

      if (rs != null) {

        try {

          rs.close();
        }
        catch (SQLException sqle) {

          System.err.println(sqle.getMessage());
        }
        rs = null;
      }
      if (stmt != null) {

        try {

          stmt.close();
        }
        catch (SQLException sqle) {

          System.err.println(sqle.getMessage());
        }
        stmt = null;
      }
      if (conn != null) {

        try {

          conn.close();
        }
        catch (SQLException sqle) {

          System.err.println(sqle.getMessage());
        }
        conn = null;
      }
    }
    return employees;
  }

	public ActionForward perform(ActionMapping mapping,
		ActionForm form,
		HttpServletRequest request,
		HttpServletResponse response)
		throws IOException, ServletException {

		// Default target to success
    String target = new String("success");

    EmployeesActionMapping employeesMapping =
      (EmployeesActionMapping)mapping;

    // Does this action require the user to login
    if ( employeesMapping.isLoginRequired() ) {

      HttpSession session = request.getSession();
      if ( session.getAttribute("USER") == null ) {

        // The user is not logged in
        target = new String("login");
        ActionErrors errors = new ActionErrors();

        errors.add(ActionErrors.GLOBAL_ERROR,
          new ActionError("errors.login.required"));

        // Report any errors we have discovered back to
        // the original form
        if (!errors.empty()) {

          saveErrors(request, errors);
        }
      }
    }

    ArrayList employees = null;

    employees = getEmployees();

    // Set the target to failure
    if ( employees == null ) {

      target = new String("login");
    }
    else {

      request.setAttribute("employees", employees);
    }
	  // Forward to the appropriate View
	  return (mapping.findForward(target));
	}
}