logonaction.java~5~

来自「100多M的J2EE培训内容」· JAVA~5~ 代码 · 共 106 行

package strutsds;

import java.io.IOException;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
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;

public class logonAction extends Action {
protected String getUser(String username, String password) {
String user = null;
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 where "+ "username='" + username + "' "+ "and password='" + password + "'");
if ( rs.next() ) {
        user = rs.getString("username");
// Iterate over the results
        System.err.println("Username : "+ rs.getString("username")+ " Password : " + rs.getString("password"));
}
else {
System.err.println("....>User not found<....");
}
}
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 user;
}

  public ActionForward perform(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse httpServletResponse) {
  String user = null;
// Default target to success
 String target = "success";
// Use the LoginForm to get the request parameters
 String username = ((logonActionForm)form).getUsername();
 String password = ((logonActionForm)form).getPassword();
 user = getUser(username, password);
// Set the target to failure
 if ( user == null ) {
 target = "login";
 ActionErrors errors = new ActionErrors();
 errors.add(ActionErrors.GLOBAL_ERROR,
 new ActionError("errors.login.unknown",username));
// Report any errors we have discovered back to the
// original form
 if (!errors.empty()) {
 saveErrors(request, errors);
 }
 }
 else {
 HttpSession session = request.getSession();
 session.setAttribute("USER", user);
 }
// Forward to the appropriate View
 return (mapping.findForward(target));
 }

}