其他分享
首页 > 其他分享> > SMBMS超市订单管理系统

SMBMS超市订单管理系统

作者：互联网

SMBMS(超市订单管理系统)

2KnZjg.png

数据库：

2KuMse.png

项目如何搭建？

考虑使用不使用Maven？用，则添加依赖，否则，导入jar包

项目搭建（准备工作）

  1. 搭建一个maven web项目
  2. 配置Tomcat
  3. 测试项目是否能够跑起来
  4. 导入项目需要的jar包
  5. 创建项目包架构

2KtxiD.png

  1. 编写实体类

    ORM映射：表-类映射

  2. 编写基础公共类

    1. 数据库配置文件

      driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306?useUnicode=true&characterEncoding=utf-8
username=root
password=123456

    2. 编写数据库的公共类

      package com.edgar.dao;

import com.mysql.jdbc.Driver;

import java.io.IOException;
import java.io.InputStream;
import java.sql.*;
import java.util.Properties;

public class BaseDao {
    private static String driver;
    private static String url;
    private static String username;
    private static String password;

    //静态代码块，类加载的时候就初始化
    static {
        //通过类加载器加载对应的资源
        InputStream in = BaseDao.class.getResourceAsStream("/db.properties");
        Properties prop = new Properties();
        try {
            prop.load(in);
        } catch (IOException e) {
            e.printStackTrace();
        }
        driver=prop.getProperty("driver");
        url=prop.getProperty("url");
        username=prop.getProperty("username");
        password=prop.getProperty("password");
    }

    //获取数据库的链接
    public static Connection getConnection()  {
        Connection connection = null;
        try {
            Class.forName(driver);
            connection = DriverManager.getConnection(url, username, password);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return connection;
    }

    //编写查询公共方法
    public static ResultSet execute(Connection connection,String sql,Object[] params,ResultSet resultSet, PreparedStatement preparedStatement) throws SQLException {
       preparedStatement = connection.prepareStatement(sql);
        //setObject占位符从1开始，当时我们的数组从0开始
        for (int i = 0; i < params.length; i++) {
            preparedStatement.setObject(i+1,params[i]);
        }
        resultSet = preparedStatement.executeQuery();
        return resultSet;
    }

    //编写增删改公共方法
    public static int execute(Connection connection,String sql,Object[] params,PreparedStatement preparedStatement) throws SQLException {
        preparedStatement = connection.prepareStatement(sql);
        //setObject占位符从1开始，当时我们的数组从0开始
        for (int i = 0; i < params.length; i++) {
            preparedStatement.setObject(i+1,params[i]);
        }
        int updateRows = preparedStatement.executeUpdate();
        return updateRows;
    }

    //释放资源
    public static boolean closeResource(Connection connection,PreparedStatement preparedStatement,ResultSet resultSet){
        boolean flag=true;
        if(resultSet!=null){
            try {
                resultSet.close();
                //GC回收
                resultSet=null;
            } catch (SQLException e) {
                flag=false;
                e.printStackTrace();
            }

        }
        if(preparedStatement!=null){
            try {
                preparedStatement.close();
                //GC回收
                preparedStatement=null;
            } catch (SQLException e) {
                flag=false;
                e.printStackTrace();
            }

        }
        if(connection!=null){
            try {
                connection.close();
                //GC回收
                connection=null;
            } catch (SQLException e) {
                flag=false;
                e.printStackTrace();
            }

        }
        return flag;
    }
}

    3. 编写字符编码过滤器

  3. 导入静态资源

登录功能实现

思路：

2lm92V.png

  1. 编写前端

  2. 设置首页 web.xml配置

    <!--设置欢迎页面-->
<welcome-file-list>
    <welcome-file>login.jsp</welcome-file>
</welcome-file-list>

  3. 编写dao层登录用户的接口

    package com.edgar.dao.user;

import com.edgar.pojo.User;

import java.sql.Connection;
import java.sql.SQLException;

public interface UserDao {
    //得到登录用户
    User getLoginUser(Connection connection,String userCode,String userPassword) throws SQLException;
}

  4. 编写dao层的实现类

    package com.edgar.dao.user;

import com.edgar.dao.BaseDao;
import com.edgar.pojo.User;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class UserDaoImpl implements UserDao {

    public User getLoginUser(Connection connection, String userCode, String userPassword) throws SQLException {
        PreparedStatement pstm = null;
        ResultSet rs = null;
        User user = null;

        if (connection != null) {
            String sql = "select * from smbms_user where userCode=? and userPassword=?";
            Object[] params = {userCode, userPassword};

            rs = BaseDao.execute(connection, pstm, rs, sql, params);
            if (rs.next()) {
                user = new User();
                user.setId(rs.getInt("id"));
                user.setUserCode(rs.getString("userCode"));
                user.setUserName(rs.getString("userName"));
                user.setUserPassword(rs.getString("userPassword"));
                user.setGender(rs.getInt("gender"));
                user.setBirthday(rs.getDate("birthday"));
                user.setPhone(rs.getString("phone"));
                user.setAddress(rs.getString("address"));
                user.setUserRole(rs.getInt("userRole"));
                user.setCreateBy(rs.getInt("createdBy"));
                user.setCreationDate(rs.getTimestamp("creationDate"));
                user.setModifyBy(rs.getInt("modifyBy"));
                user.setModifyDate(rs.getDate("modifyDate"));
            }
            BaseDao.closeResource(null, pstm, rs);
        }
        return user;

    }
}

  5. 业务层接口

    package com.edgar.service.user;

import com.edgar.pojo.User;

public interface UserService {
   //用户登录
   User login(String userCode, String password);
}

  6. 业务层实现

    package com.edgar.service.user;

import com.edgar.dao.BaseDao;
import com.edgar.dao.user.UserDao;
import com.edgar.dao.user.UserDaoImpl;
import com.edgar.pojo.User;
import org.junit.Test;

import java.sql.Connection;
import java.sql.SQLException;

public class UserServiceImpl implements UserService {
    //业务层都会调用Dao层，所以我们要引入Dao层；
    private UserDao userDao;

    public UserServiceImpl() {
        userDao = new UserDaoImpl();
    }

    public User login(String userCode, String password) {
        Connection connection = null;
        User user = null;

        try {
            connection = BaseDao.getConnection();
            //通过业务层调用对应的具体的数据库操作
            user = userDao.getLoginUser(connection, userCode, password);
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            BaseDao.closeResource(connection, null, null);
        }
        return user;
    }

    @Test
    public void test() {
        UserService userService = new UserServiceImpl();
        User admin = userService.login("admin", "123456");
        System.out.println(admin.getUserPassword());
    }
}

  7. 编写Servlet

    package com.edgar.servlet.user;

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

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

public class LoginServlet extends HttpServlet {

    //Servlet：控制层，调用业务层代码
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        System.out.println("LoginServlet--start....");

        //获取用户名和密码
        String userCode = req.getParameter("userCode");
        String userPassword = req.getParameter("userPassword");

        //和数据库中的密码进行对比，调用业务层
        UserService userService = new UserServiceImpl();
        User user = userService.login(userCode, userPassword); //这里已经把登录的人查出来了

        if (user != null) { //查有此人，可以登录
            //将用户的信息放到Session中
            req.getSession().setAttribute(Constants.USER_SESSION, user);
            //跳转到主页
            resp.sendRedirect("jsp/frame.jsp");
        } else {//查无此人，无法登录
            //转发回登陆页面，顺带提示它，用户名或者密码错误
            req.setAttribute("error", "用户名或者密码不正确");
            req.getRequestDispatcher("/login.jsp").forward(req, resp);
        }

    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

  8. 注册Servlet

    <servlet>
    <servlet-name>LoginServlet</servlet-name>
    <servlet-class>com.edgar.servlet.user.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>LoginServlet</servlet-name>
    <url-pattern>/login.do</url-pattern>
</servlet-mapping>

  9. 测试访问，确保以上功能成功！

登录功能优化（Filter）

注销功能

思路：移除session，返回登陆页面

package com.edgar.servlet.user;

import com.edgar.util.Constants;

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

public class LogoutServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //用处用户的Constants.USER_SESSION
        req.getSession().removeAttribute(Constants.USER_SESSION);
        resp.sendRedirect(req.getContextPath() + "/login.jsp"); //返回登陆页面
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

注册到web.xml

<servlet>
    <servlet-name>LogoutServlet</servlet-name>
    <servlet-class>com.edgar.servlet.user.LogoutServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>LogoutServlet</servlet-name>
    <url-pattern>/logout.do</url-pattern>
</servlet-mapping>

登录拦截优化

编写一个拦截器，并注册到web.xml

package com.edgar.filter;

import com.edgar.pojo.User;
import com.edgar.util.Constants;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class SysFilter implements Filter {
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) resp;
        //过滤器，从Session中获取用户
        User user = (User) request.getSession().getAttribute(Constants.USER_SESSION);
        if (user == null) {//已经被注销了，或者没登陆
            response.sendRedirect(request.getContextPath() + "/error.jsp");
        } else {
            chain.doFilter(req, resp);
        }
    }

    public void destroy() {

    }
}


<!--用户登录过滤器-->
<filter>
    <filter-name>SysFilter</filter-name>
    <filter-class>com.edgar.filter.SysFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>SysFilter</filter-name>
    <url-pattern>/jsp/*</url-pattern>
</filter-mapping>

密码修改

思路：

2UcX26.png

  1. 导入前端素材

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

  2. 写项目，建议从底层往上写

    dao-->service-->servlet

  3. UserDao接口

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

  4. UserDao实现类

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

  5. UserService层

    //修改用户ID修改密码
boolean updatePwd(int id, String passWord);

  6. UserService实现类

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

  7. 编写Servlet，记得实现复用，需要提取出方法！

    package com.edgar.servlet.user;

import com.alibaba.fastjson.JSONObject;
import com.edgar.pojo.User;
import com.edgar.service.user.UserService;
import com.edgar.service.user.UserServiceImpl;
import com.edgar.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;
import java.io.PrintWriter;
import java.util.HashMap;

//实现Servlet复用
public class UserServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        String method = req.getParameter("method");
        if ("updatePwd".equals(method)) { // 修改密码
            this.updatePwd(req, resp);
        } else if ("checkOldPwd".equals(method)) { //校验旧密码
            this.checkOldPwd(req, resp);
        }

    }

    public void updatePwd(HttpServletRequest req, HttpServletResponse resp) {
        //从Session里面拿ID
        Object o = req.getSession().getAttribute(Constants.USER_SESSION);
        String newpassword = req.getParameter("newpassword");
        boolean flag = false;
        if (o != null && !StringUtils.isNullOrEmpty(newpassword)) {
            UserService userService = new UserServiceImpl();
            flag = userService.updatePwd(((User) o).getId(), newpassword);
            if (flag) {
                req.setAttribute("message", "修改密码成功，请退出，使用新密码登录");
                //密码修改成功，移除当前Session
                req.getSession().removeAttribute(Constants.USER_SESSION);
            } else {
                req.setAttribute("message", "密码修改失败");
            }
        } else {
            req.setAttribute("message", "新密码有问题");
        }
        try {
            req.getRequestDispatcher("/jsp/pwdmodify.jsp").forward(req, resp);
        } catch (ServletException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //校验旧密码，session中有旧密码
    public void checkOldPwd(HttpServletRequest req, HttpServletResponse resp) {
        String oldPwd = req.getParameter("oldPassword");
        Object o = req.getSession().getAttribute(Constants.USER_SESSION);
        //万能的Map：结果集
        HashMap<String, Object> resultMap = new HashMap<String, Object>();
        if (o == null) { // session失效，session过期了
            resultMap.put("result", "sessionerror");
        } else if (StringUtils.isNullOrEmpty(oldPwd)) { // 输入的密码为空
            resultMap.put("result", "error");
        } else {
            String userPassword = ((User) o).getUserPassword(); //session中的用户密码
            if (oldPwd.equals(userPassword)) {
                resultMap.put("result", "true");
            } else {
                resultMap.put("result", "false");
            }
        }
        try {
            resp.setContentType("application/json");
            PrintWriter writer = resp.getWriter();
            // JSONObject 阿里巴巴的JSON工具类，转换格式
            String jsonString = JSONObject.toJSONString(resultMap);
            writer.write(jsonString);
            writer.flush();
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

  8. Servlet注册到web.xml

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

  9. 测试访问

密码修改优化（Ajax）

使用Ajax校验旧密码

前端代码：

oldpassword.on("blur",function(){
		$.ajax({
			type:"GET",
			url:path+"/jsp/user.do",
			data:{method:"checkOldPwd",oldPassword:oldpassword.val()},
			dataType:"json",
			success:function(data){
				if(data.result == "true"){//旧密码正确
					validateTip(oldpassword.next(),{"color":"green"},imgYes,true);
				}else if(data.result == "false"){//旧密码输入不正确
					validateTip(oldpassword.next(),{"color":"red"},imgNo + " 原密码输入不正确",false);
				}else if(data.result == "sessionerror"){//当前用户session过期，请重新登录
					validateTip(oldpassword.next(),{"color":"red"},imgNo + " 当前用户session过期，请重新登录",false);
				}else if(data.result == "error"){//旧密码输入为空
					validateTip(oldpassword.next(),{"color":"red"},imgNo + " 请输入旧密码",false);
				}
			},
			error:function(data){
				//请求出错
				validateTip(oldpassword.next(),{"color":"red"},imgNo + " 请求错误",false);
			}
		});

后台代码：

//校验旧密码，session中有旧密码
public void checkOldPwd(HttpServletRequest req, HttpServletResponse resp) {
    String oldPwd = req.getParameter("oldPassword");
    Object o = req.getSession().getAttribute(Constants.USER_SESSION);
    //万能的Map：结果集
    HashMap<String, Object> resultMap = new HashMap<String, Object>();
    if (o == null) { // session失效，session过期了
        resultMap.put("result", "sessionerror");
    } else if (StringUtils.isNullOrEmpty(oldPwd)) { // 输入的密码为空
        resultMap.put("result", "error");
    } else {
        String userPassword = ((User) o).getUserPassword(); //session中的用户密码
        if (oldPwd.equals(userPassword)) {
            resultMap.put("result", "true");
        } else {
            resultMap.put("result", "false");
        }
    }
    try {
        resp.setContentType("application/json");
        PrintWriter writer = resp.getWriter();
        // JSONObject 阿里巴巴的JSON工具类，转换格式
        String jsonString = JSONObject.toJSONString(resultMap);
        writer.write(jsonString);
        writer.flush();
        writer.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

用户管理实现（查询分页）

思路：

2arUKg.png

  1. 导入分页的工具类

  2. 用户列表页面导入

    userlist.jsp

1、获取用户数量

  1. UserDao

    //查询用户总数
int getUserCount(Connection connection,String userName,int userRole) throws SQLException;

  2. UserDaoImpl

    //查询用户总数
public int getUserCount(Connection connection, String userName, int userRole) throws SQLException {
    PreparedStatement pstm = null;
    ResultSet rs = null;
    int count = 0;

    if (connection != null) {
        ArrayList<Object> list = new ArrayList<Object>();//存放我们的参数
        StringBuffer stringBuffer = new StringBuffer();
        stringBuffer.append("select count(1) as count from smbms_user u,smbms_role r where u.userRole=r.id");
        if (userName != null) {
            stringBuffer.append(" and userName like ?");
            list.add("%" + userName + "%");//index=0
        }
        if (userRole > 0) {
            stringBuffer.append(" and userRole = ?");
            list.add(userRole);//index=1
        }
        //怎么把list转为数组？ list.toArray()
        rs = BaseDao.execute(connection, pstm, rs, stringBuffer.toString(), list.toArray());
        if (rs.next()) {
            count = rs.getInt("count");//从结果集中获取最终的数量
        }
        BaseDao.closeResource(null, pstm, rs);
    }
    return count;

}

  3. UserService

    //查询用户总
int getUserCount(String userName,int userRole);

  4. UserServiceImpl

    public int getUserCount(String userName, int userRole) {
    Connection conn = null;
    int count = 0;
    try {
        conn = BaseDao.getConnection();
        count = userDao.getUserCount(conn, userName, userRole);
    } catch (SQLException e) {
        e.printStackTrace();
    } finally {
        BaseDao.closeResource(conn, null, null);
    }
    return count;
}

2、获取用户列表

  1. UserDao

    //查询用户信息
List<User> getUserList(Connection connection,String userName,int userRole,int currentPageNo,int pageSize) throws SQLException;

  2. UserDaoImpl

    public List<User> getUserList(Connection connection, String userName, int userRole, int currentPageNo, int pageSize) throws SQLException {
    PreparedStatement pstm = null;
    ResultSet rs = null;
    User user = null;
    List<User> userList = new ArrayList<User>();

    if (connection != null) {
        ArrayList<Object> list = new ArrayList<Object>();//存放我们的参数
        StringBuffer sql = new StringBuffer();
        sql.append("select * from smbms_user u,smbms_role r where u.userRole=r.id");
        if (userName != null) {
            sql.append(" and userName like ?");
            list.add("%" + userName + "%");//index=0
        }
        if (userRole > 0) {
            sql.append(" and userRole = ?");
            list.add(userRole);//index=1
        }
        sql.append(" order by creationDate DESC limit ?,?");
        int startIndex = (currentPageNo - 1) * pageSize;//起始位置
        list.add(startIndex);
        list.add(pageSize);

        //怎么把list转为数组？ list.toArray()
        rs = BaseDao.execute(connection, pstm, rs, sql.toString(), list.toArray());
        while (rs.next()) {
            user = new User();
            user.setId(rs.getInt("id"));
            user.setUserCode(rs.getString("userCode"));
            user.setUserName(rs.getString("userName"));
            user.setUserPassword(rs.getString("userPassword"));
            user.setGender(rs.getInt("gender"));
            user.setBirthday(rs.getDate("birthday"));
            user.setPhone(rs.getString("phone"));
            user.setAddress(rs.getString("address"));
            user.setUserRole(rs.getInt("userRole"));
            user.setCreateBy(rs.getInt("createdBy"));
            user.setCreationDate(rs.getTimestamp("creationDate"));
            user.setModifyBy(rs.getInt("modifyBy"));
            user.setModifyDate(rs.getDate("modifyDate"));
            userList.add(user);
        }
        BaseDao.closeResource(null, pstm, rs);
    }
    return userList;
}

  3. UserService

    //查询用户信息
List<User> getUserList(Connection connection, String userName, int userRole, int currentPageNo, int pageSize);

  4. UserServiceImpl

    //查询用户信息
public List<User> getUserList(Connection connection, String userName, int userRole, int currentPageNo, int pageSize) {
    Connection conn = null;
    List<User> userList = null;

    try {
        conn = BaseDao.getConnection();
        userList = userDao.getUserList(conn, userName, userRole, currentPageNo, pageSize);
    } catch (SQLException e) {
        e.printStackTrace();
    } finally {
        BaseDao.closeResource(conn, null, null);
    }
    return userList;
}

3、获取角色操作

为了我们的职责统一，可以把角色的操作单独放在一个包中，和POJO类对应

  1. RoleDao

    //获取角色列表
List<Role> getRoleList(Connection connection) throws SQLException;

  2. RoleDaoImpl

    //获取角色列表
public List<Role> getRoleList(Connection connection) throws SQLException {
    PreparedStatement pstm = null;
    ResultSet rs = null;
    List<Role> roleList = new ArrayList<Role>();

    if (connection != null) {
        String sql = "select * from smbms_role";
        Object[] params = {};
        rs = BaseDao.execute(connection, pstm, rs, sql, params);
        while (rs.next()) {
            Role role = new Role();
            role.setId(rs.getInt("id"));
            role.setRoleCode(rs.getString("roleCode"));
            role.setRoleName(rs.getString("roleName"));
            roleList.add(role);
        }
        BaseDao.closeResource(null, pstm, rs);
    }
    return roleList;
}

  3. RoleService

    //获取角色列表
List<Role> getRoleList();

  4. RoleServiceImpl

    //获取角色列表
public List<Role> getRoleList() {
    Connection conn = null;
    List<Role> roleList = null;

    try {
        conn = BaseDao.getConnection();
        roleList = roleDao.getRoleList(conn);
    } catch (SQLException e) {
        e.printStackTrace();
    } finally {
        BaseDao.closeResource(conn, null, null);
    }
    return roleList;
}

4、用户显示的Servlet

  1. 获取用户前端的数据

  2. 判断参数的值的合理性，保证代码的健壮

  3. 为了实现分页，需要计算出当前页和总页面，页面大小

  4. 查询用户数据、角色数据、总页数、当前页

  5. 携带数据，返回前端

    //重点 难点
public void query(HttpServletRequest req, HttpServletResponse resp) {
    //从前端获取数据
    String queryUserName = req.getParameter("queryname");
    String temp = req.getParameter("queryUserRole");
    String pageIndex = req.getParameter("pageIndex");

    int queryUserRole = 0;
    int pageSize = 5;
    int currentPageNo = 1;
    if (queryUserName == null) {
        queryUserName = "";
    }
    if (temp != null && !temp.equals("")) {
        queryUserRole = Integer.parseInt(temp);
    }
    if (pageIndex != null) {
        currentPageNo = Integer.parseInt(pageIndex);
    }

    UserService userService = new UserServiceImpl();
    //获取用户的总数
    int totalCount = userService.getUserCount(queryUserName, queryUserRole);

    //总页数支持
    PageSupport pageSupport = new PageSupport();
    pageSupport.setPageSize(pageSize);
    pageSupport.setCurrentPageNo(currentPageNo);
    pageSupport.setTotalCount(totalCount);

    int totalPageCount = pageSupport.getTotalPageCount();// 总页数

    //控制首页和尾页
    if (currentPageNo < 1) {
        currentPageNo = 1; // 当前页比1小时，值为1
    } else if (currentPageNo > totalPageCount) {
        currentPageNo = totalPageCount;//当前页大于总页数，值为总页数
    }

    //获取用户列表
    List<User> userList = userService.getUserList(queryUserName, queryUserRole, currentPageNo, pageSize);
    req.setAttribute("userList", userList);

    //获取角色列表
    RoleService roleService = new RoleServiceImpl();
    List<Role> roleList = roleService.getRoleList();
    req.setAttribute("roleList", roleList);

    req.setAttribute("totalCount", totalCount);
    req.setAttribute("currentPageNo", currentPageNo);
    req.setAttribute("totalPageCount", totalPageCount);
    req.setAttribute("queryUserName", queryUserName);
    req.setAttribute("queryUserRole", queryUserRole);

    try {
        req.getRequestDispatcher("/jsp/userlist.jsp").forward(req, resp);
    } catch (ServletException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }


}

标签：String,管理系统,req,rs,超市,SMBMS,user,import,null
来源： https://www.cnblogs.com/edgarstudy/p/14865955.html