JavaWeb27（SMBMS项目搭建04）

实现修改密码功能

1.UserDao接口

//修改当前用户密码
    public int updatePwd(Connection connection,int id,int password)throws SQLException;

2.UserDao接口实现类

public int updatePwd(Connection connection, int id, int password) throws SQLException {
    
    
        //用来执行预编译
        PreparedStatement preparedStatement = null;
        int execute=0;
        if (connection!=null){
    
    
            String sql = "update smbms_user set userPassword = ? where id = ?";
            Object params[]={
    
    password,id};
            execute = BaseDao.execute(connection, preparedStatement, sql, params);
        }
        return execute;
    }

3.UserService接口

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

4.UserService接口实现类

public boolean updatePwd(int id, int password) {
    
    
        Connection connection = null;
        boolean flag=false;

        //修改密码
        try {
    
    
            connection= BaseDao.getConnection();
            if (userDao.updatePwd(connection,id,password)>0){
    
    //修改成功
                flag=true;
            }
        } catch (SQLException throwables) {
    
    
            throwables.printStackTrace();
        }finally {
    
    
            BaseDao.closeResources(connection,null,null);
        }
        return flag;
    } 

5. UserServlet

package com.hao.servlet.user;

import com.hao.pojo.User;
import com.hao.service.user.UserService;
import com.hao.service.user.UserServiceImpl;
import com.hao.util.Constants;
import com.mysql.jdbc.StringUtils;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

//实现Servlet复用 封装成方法
public class UserServlet extends HttpServlet {
    
    
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    
    
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    
    
        String method = req.getParameter("method");
        if (method!=null&&method.equals("savepwd")){
    
    
            this.updatePwd(req,resp);
        }
    }
    public void updatePwd(HttpServletRequest req, HttpServletResponse resp){
    
    
        //从Session中获取用户id （用户登陆时，所有信息都已存入Session中）
        Object attribute = req.getSession().getAttribute(Constants.USER_SESSION);
        String newpassword = req.getParameter("newpassword");
        boolean flag =false;
        if (attribute!=null&& !StringUtils.isNullOrEmpty(newpassword)){
    
    
            UserService userService = new UserServiceImpl();
            flag = userService.updatePwd(((User)attribute).getId(),newpassword);
            if (flag){
    
    
                req.setAttribute("massage","密码修改成功，请重新登录");
                //密码修改成功，移除当前Session
                req.getSession().removeAttribute(Constants.USER_SESSION);
            }else {
    
    
                req.setAttribute("massage","密码修改失败");
            }
        }else {
    
    
            req.setAttribute("massage","新密码有问题");
        }
        try {
    
    
            req.getRequestDispatcher("pwdmodify.jsp").forward(req,resp);
        } catch (ServletException e) {
    
    
            e.printStackTrace();
        } catch (IOException e) {
    
    
            e.printStackTrace();
        }
    }

}

6.在Web.xml中注册

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

7.优化(验证旧密码)

//验证旧密码,session中有旧密码，不用重新从底层写起
    public void pwdModify(HttpServletRequest req, HttpServletResponse resp){
    
    
        //从Session中拿到用户
        Object object = req.getSession().getAttribute(Constants.USER_SESSION);
        String oldpassword = req.getParameter("oldpassword");
        //万能Map 结果集
        HashMap<String, String> resultMap = new HashMap<String,String>();
        if(object==null){
    
    //session失效或过期
            resultMap.put("result","sessionerror");
        }else if (StringUtils.isNullOrEmpty(oldpassword)){
    
    //输入的密码为空
            resultMap.put("result","error");
        }else {
    
    
            //session中用户的密码
            String userPassword = ((User) object).getUserPassword();
            if (oldpassword.equals(userPassword)){
    
    
                resultMap.put("result","true");
            }else {
    
    
                resultMap.put("result","false");
            }
        }

        try {
    
    
            resp.setContentType("application/json");
            PrintWriter writer = resp.getWriter();
            //JSONArray 阿里巴巴的Json工具类 用来转换格式
            /*
            resultMap=["result","sessionerror","result","error"]->
            Json格式={key:value}
             */
            writer.write(JSONArray.toJSONString(resultMap));
            writer.flush();
            writer.close();
        } catch (IOException e) {
    
    
            e.printStackTrace();
        }

8.测试访问

将密码改为八个8

查看数据库中数据

确实已经改变