java项目中修改密码 javaweb修改密码代码

33.smbms密码修改实现

1. 导入前端素材

<li><a href="${pageContext.request.contextPath }/jsp/pwdmodify.jsp">密码修改</a></li>
 

写项目，建议从底层向上写

2. UserDao接口
   updatePwd.java

//修改当前用户密码
 public int updatePwd(Connection connection, int id, String pwd) throws Exception;

2. UserDao接口实现类
   updatePwd.java

//修改当前用户密码
 public int updatePwd(Connection connection, int id, String pwd) throws Exception {
     int flag = 0;
     PreparedStatement pstm = null;
     if (connection != null) {
         String sql = "update smbms_user set userPassword= ? where id = ?";
         Object[] params = {pwd, id};
         flag = BaseDao.execute(connection, pstm, sql, params);
         BaseDao.closeResource(null, pstm, null);
     }
     return flag;
 }

4. UserService层

//根据用户Id修改密码
 public boolean updatePwd(int id, String pwd);

4. UserService实现类

public boolean updatePwd(int id, String pwd) {
     boolean flag = false;
     Connection connection = null;
     try {
         connection = BaseDao.getConnection();
         if (userDao.updatePwd(connection, id, pwd) > 0) {
             flag = true;
         }
     } catch (Exception e) {
         e.printStackTrace();
     } finally {
         BaseDao.closeResource(connection, null, null);
     }
     return flag;
 }

4. servlet记得实现复用，要提取出方法！在 dao层service层下面是 servlet层 的主体

//实现Servlet的复用
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
     //从Session里面拿ID
     Object o = request.getSession().getAttribute(Constants.USER_SESSION);
     String newpassword = request.getParameter("newpassword");
     boolean flag = false;
     if (o != null && !StringUtils.isNullOrEmpty(newpassword)) {
         UserService userService = new UserServiceImpl();
         flag = userService.updatePwd(((User) o).getId(), newpassword);
         if (flag) {
             request.setAttribute("message", "修改密码成功,请退出并使用新密码重新登录！");
             request.getSession().removeAttribute(Constants.USER_SESSION);//session注销
         } else {
             request.setAttribute("message", "修改密码失败！");
         }
     } else {
         request.setAttribute("message", "修改密码失败！");
     }
     //修改成功后转发就行了
     request.getRequestDispatcher("pwdmodify.jsp").forward(request, response);
 }

4. 提取为方法

public class UserServlet extends HttpServlet {
     @Override
     protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         String method = request.getParameter( "method" );
         if(method.equals( "savepwd" ) && method != null){
             this.updatePwd( request,response );
         }
 
     }
 
     @Override
     protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
         doGet( req, resp );
     }
     public void updatePwd(HttpServletRequest request, HttpServletResponse response){
         //从Session里面拿ID
         Object o = request.getSession().getAttribute(Constants.USER_SESSION);
         String newpassword = request.getParameter("newpassword");
         boolean flag = false;
         if (o != null && !StringUtils.isNullOrEmpty(newpassword)) {
             UserService userService = new UserServiceImpl();
             flag = userService.updatePwd(((User) o).getId(), newpassword);
             if (flag) {
                 request.setAttribute("message", "修改密码成功,请退出并使用新密码重新登录！");
                 request.getSession().removeAttribute(Constants.USER_SESSION);//session注销
             } else {
                 request.setAttribute("message", "修改密码失败！");
             }
         } else {
             request.setAttribute("message", "修改密码失败！");
         }
         //修改成功后转发就行了
         try {
             request.getRequestDispatcher("pwdmodify.jsp").forward(request, response);
         } catch (ServletException e) {
             e.printStackTrace();
         } catch (IOException e) {
             e.printStackTrace();
         }
     }
 }

注册xml

<servlet>
     <servlet-name>UserServlet</servlet-name>
     <servlet-class>com.study.servlet.user.UserServlet</servlet-class>
 </servlet>
 <servlet-mapping>
     <servlet-name>UserServlet</servlet-name>
     <url-pattern>/jsp/user.do</url-pattern>
 </servlet-mapping>

4. 测试