Java WEB 连接数据库的登录界面失败？

Question

连接数据库是成功的，但是输入用户名和密码后跳转到错误页面
有几段代码不太确定对不对，请帮忙看一看
//login.jsp

<form name="form1" method="post" action="manager.do?action=login">

//struts-config.xml

      <action name="managerForm" path="/manager" scope="request" type="com.action.Manager" validate="true">
      <forward name="managerLoginok" path="/main.jsp" />
      <forward name="error" path="/error.jsp" />
    </action>

//Manager.java

package com.action;

import org.apache.struts.action.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.actionForm.ManagerForm;
import com.dao.ManagerDAO;
import javax.servlet.http.HttpSession;

public class Manager extends Action {
    private ManagerDAO managerDAO = null;

    public Manager() {
        this.managerDAO = new ManagerDAO();
    }

    public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response) {
        String action = request.getParameter("action");
        if (action == null || "".equals(action)) {
            return mapping.findForward("error");
        } else if ("login".equals(action)) {
            return managerLogin(mapping, form, request, response);
        }
        request.setAttribute("error", "操作失败！");
        return mapping.findForward("error");
    }
    // 管理员身份验证
    public ActionForward managerLogin(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response) {
        ManagerForm managerForm = (ManagerForm) form;  //将接收到的表单信息强制转换成ActionForm类型
        managerForm.setAd_name(managerForm.getAd_name());
        managerForm.setAd_pwd(managerForm.getAd_pwd());
        int ret = managerDAO.checkManager(managerForm);
        System.out.print("验证结果ret的值:" + ret);
        if (ret == 1) {
            //将登录到系统的管理员名称保存到session
            HttpSession session = request.getSession();
            session.setAttribute("manager", managerForm.getAd_name());
            return mapping.findForward("managerLoginok");
        } else {
            request.setAttribute("error", "您输入的管理员名称或密码错误！");
            return mapping.findForward("error");
        }
    }
}

//ConnDB.java

//执行查询语句
    public ResultSet executeQuery(String sql) {
        try {
            conn=getConnection();
            stmt=conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_READ_ONLY);
            rs=stmt.executeQuery(sql);
        }
        catch(SQLException ex){
            System.err.println(ex.getMessage());
        }
        return rs;
    }

//ManagerDAO.java

//管理员身份验证
    public int checkManager(ManagerForm managerForm) {
        int flag = 0;
        ChStr chStr=new ChStr();
        String sql = "SELECT * FROM Ad_info where ad_name='" +
        chStr.filterStr(managerForm.getAd_name()) + "'";
        ResultSet rs = conn.executeQuery(sql);
        try {
            if (rs.next()) {
                String pwd = chStr.filterStr(managerForm.getAd_pwd());      //获取输入的密码并过滤输入字符串中的危险字符
                if (pwd.equals(rs.getString(3))) {
                    flag = 1;
                } else {
                    flag = 0;
                }
            }else{
                flag = 0;
            }
        } catch (SQLException ex) {
            flag = 0;
        }finally{
            conn.close();
        }
        return flag;
    }

大概应该是这几段代码的原因，但是不清楚应该怎么修改，请帮忙看一下

Answer 1

https://www.cnblogs.com/mhj666/p/7884678.html