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超市管理系统总结篇三用户密码修改

在这里插入图片描述

UserDao接口

//修改当前用户密码
	public int updatePwd(Connection connection,int id,int password)throws SQLException, Exception;
12

UserDao接口实现类

@Override//修改当前密码
	public int updatePwd(Connection connection, int id, int password) throws Exception {
		// TODO 自动生成的方法存根
		PreparedStatement pstm = null;
		int execute =0;
		if(connection!=null) {
			String sql = "update smbms_user set = userPassword = ? where id = ?";
			Object[] params = {password,id};
			execute = BaseDao.execute(connection, pstm, sql, params);
			BaseDao.closeResource(null, pstm, null);
		}
		return execute;			
	}
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UserService层

public boolean updatePwd(int id,int password)throws SQLException, Exception;
1

UserService实现类

public boolean updatePwd(int id, int password) throws SQLException, Exception {
		// TODO 自动生成的方法存根
		Connection connection = null;
		boolean flag = false;
		//修改密码
		try {
			connection = BaseDao.getConnection();
			if(userDao.updatePwd(connection, id, password)>0) {
				flag = true;
			}
		} catch (SQLException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		} finally {
			BaseDao.closeResource(connection, null, null);
			
		}
		return flag;
	}
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servlet记得实现复用，要提取出方法！
在 dao层 和 service层 自己写映射类和实现类
下面是 servlet层 的主体

public class UserServlet extends HttpServlet {
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		// TODO 自动生成的方法存根
		String method = req.getParameter("method");
		if (method != "savepwd" && method != null) {
			this.updatePwd(req, resp);
		}
		//实现复用~~~~~~
		// 想添加新的增删改查，直接用if(method != "savepwd" && method != null);
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		// TODO 自动生成的方法存根
		doGet(req, resp);
	}

	public void updatePwd(HttpServletRequest req, HttpServletResponse resp) {
		// 通过session获得用户id
		Object o = req.getSession().getAttribute(Constants.USER_SESSION);
		String newpassword = req.getParameter("newpassword");
		boolean flag = false;
		if (o != null && newpassword != null) {
			UserService userService = new UserServiceImpl();

			try {
				flag = userService.updatePwd(((User) o).getId(), newpassword);
			} catch (SQLException e) {
				// TODO 自动生成的 catch 块
				e.printStackTrace();
			} catch (Exception e) {
				// TODO 自动生成的 catch 块
				e.printStackTrace();
			}
			if (flag) {
				req.setAttribute("message", "密码修改成功，请退出，使用新密码登录");
				// 密码修改成功,移除session(移除后不能再次修改密码,建议不移除)
				req.getSession().removeAttribute(Constants.USER_SESSION);
			} else {
				// 密码修改失败
				req.setAttribute("message", "密码修改失败");
			}

		} else {
			// 密码修改有问题
			req.setAttribute("message", "新密码有问题");
		}
		try {
			req.getRequestDispatcher("/jsp/pwdmodify.jsp").forward(req, resp);
		} catch (ServletException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		} catch (IOException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}
	}
}

注册xml

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

优化密码修改使用Ajax

阿里巴巴的fastjson

<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.68</version>
</dependency>

2.后台代码修改

导入阿里的包

<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.68</version>
</dependency>
123456
import java.io.IOException;
import java.io.PrintWriter;
//import java.io.Writer;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.mysql.cj.util.StringUtils;
import com.mysql.cj.xdevapi.JsonArray;

//import com.mysql.cj.util.StringUtils;

import pojo.User;
import service.user.UserService;
import service.user.UserServiceImpl;
import util.Constants;

@SuppressWarnings("serial")
public class UserServlet extends HttpServlet {
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		// TODO 自动生成的方法存根
		String method = req.getParameter("method");
		if (method.equals( "savepwd") && method != null) {
			this.updatePwd(req, resp);
		}else if (method.equals( "pwdmodify") && method != null) {
			
		}
		// 想添加新的增删改查，直接用if(method != "savepwd" && method != null);
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		// TODO 自动生成的方法存根
		doGet(req, resp);
	}

	public void updatePwd(HttpServletRequest req, HttpServletResponse resp) {
		// 通过session获得用户id
		Object o = req.getSession().getAttribute(Constants.USER_SESSION);
		String newpassword = req.getParameter("newpassword");
		boolean flag = false;
		if (o != null && newpassword != null) {
			UserService userService = new UserServiceImpl();

			try {
				flag = userService.updatePwd(((User) o).getId(), newpassword);
			} catch (SQLException e) {
				// TODO 自动生成的 catch 块
				e.printStackTrace();
			} catch (Exception e) {
				// TODO 自动生成的 catch 块
				e.printStackTrace();
			}
			if (flag) {
				req.setAttribute("message", "密码修改成功，请退出，使用新密码登录");
				// 密码修改成功,移除session(移除后不能再次修改密码,建议不移除)
				req.getSession().removeAttribute(Constants.USER_SESSION);
			} else {
				// 密码修改失败
				req.setAttribute("message", "密码修改失败");
			}

		} else {
			// 密码修改有问题
			req.setAttribute("message", "新密码有问题");
		}
		try {
			req.getRequestDispatcher("/jsp/pwdmodify.jsp").forward(req, resp);
		} catch (ServletException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		} catch (IOException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}
	}

	public void pqdmodify(HttpServletRequest req, HttpServletResponse resp) {
		// 通过session获得用户id
		Object o = req.getSession().getAttribute(Constants.USER_SESSION);
		String oldpassword = req.getParameter("oldpassword");
		
		Map<String, String> resultMap = new HashMap<String, String>();
		if(o==null) {//session失效，session过期了
			resultMap.put("result","seesionerror");
		}else if(StringUtils.isNullOrEmpty(oldpassword)){//输入密码为空
			resultMap.put("result","error");
		}else {//
			String userPassword = ((User)o).getUserPassword();//seesion中的用户密码
			if(oldpassword.equals(userPassword)) {
				resultMap.put("result","true");
			}else {
				resultMap.put("result","false");
			}
		}
		
		
		try {
			resp.setContentType("application/josn");
			PrintWriter writer = resp.getWriter();
			/*
			 * resultMap = ["result","sessionerror","result",error]
			 * josn格式={key,value
			 */
			//writer.write(JSONArray.toJSONString(resultMap));
			writer.write(JsonArray.class.toString());
			writer.flush();
			writer.close();
		} catch (IOException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}
	}
}

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原文地址：https://www.cnblogs.com/xiaxiaopi/p/14429479.html