Java编程

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Java

EmployeeListAction.java~5~：源码内容
							package strutsds;
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;
    //1.
    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()) {
       //2.new Employee() object
        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"));
        //3.add it to the collection
        employees.add(employee);
        System.err.println("in EmployeeActionList ---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 httpServletResponse) {
// Forward to the appropriate View
    request.setAttribute("employees",getEmployees());
    return (mapping.findForward("success"));
  }
}

						