logonaction.java~2~

来自「100多M的J2EE培训内容」· JAVA~2~ 代码 · 共 114 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 execute(ActionMapping mapping,
ActionForm form,
HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
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));
}
}