GIF动态图演示
☁️☁️☁️百度百度网盘提取项目 带数据库！[链接]:https://pan.baidu.com/s/13F2rxszZRLGDt9pr6ixYUg提取码：关注私信我发送！
一、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.导入项目中遇到的jar包
- 5.创建项目结构
6.编写实体类
ORM映射：表类映射
7.编写基础公共类
1.数据库配置文件
db.properties文件代码
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306?useUnicode=true&characterEncoding=utf-8
username=root
password=111111
2.编写数据库的公共类
java代码
package com.syj.dao;
import java.io.IOException;
import java.io.InputStream;
import java.sql.*;
import java.util.Properties;
//操作数据库的公共类
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了
static {
Properties properties = new Properties();
//通过类加载器读取对应的资源
InputStream is = BaseDao.class.getClassLoader().getResourceAsStream("db.properties");
try {
properties.load(is);
} catch (IOException e) {
e.printStackTrace();
}
driver = properties.getProperty("driver");
url = properties.getProperty("url");
username = properties.getProperty("username");
password = properties.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;
}
//编写查询公共类
public static ResultSet execute( Connection connection,String sql,Object[] params,ResultSet resultSet, PreparedStatement preparedStatement ) throws SQLException {
preparedStatement = connection.prepareStatement(sql);
for (int i = 0; i < params.length; i++) {
//setObject,占位符从1开始，但是我们的数组是从0开始！
preparedStatement.setObject(i+1,params[i]);
}
resultSet = preparedStatement.executeQuery();
return resultSet;
}
//编写增删改查公共方法
public static int execute( Connection connection,String sql,Object[] params, PreparedStatement preparedStatement ) throws SQLException {
preparedStatement = connection.prepareStatement(sql);
for (int i = 0; i < params.length; i++) {
//setObject,占位符从1开始，但是我们的数组是从0开始！
preparedStatement.setObject(i+1,params[i]);
}
int updateRows = preparedStatement.executeUpdate();
return updateRows;
}
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) {
e.printStackTrace();
flag = false;
}
}
if(preparedStatement != null){
try {
preparedStatement.close();
//GC回收
preparedStatement = null;
} catch (SQLException e) {
e.printStackTrace();
flag = false;
}
}
if(connection != null){
try {
connection.close();
//GC回收
connection = null;
} catch (SQLException e) {
e.printStackTrace();
flag = false;
}
}
return flag;
}
}
3.编写字符编码过滤器
8.导入静态资源
二、登录功能实现
1.编写前端页面
2.设置欢迎界面
xml代码
<!--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
java dao层接口代码
package com.syj.dao.user;
import com.syj.entity.User;
import java.sql.Connection;
import java.sql.SQLException;
public interface UserDao {
//得到登录的用户
public User getLoginUser(Connection connection,String userCode) throws SQLException;
}
4.编写dao接口的实现类
java dao接口的实现类代码
package com.syj.dao.user;
import com.syj.dao.BaseDao;
import com.syj.entity.User;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class UserDaoImpl implements UserDao{
//得到要登录的用户
public User getLoginUser(Connection connection, String userCode) throws SQLException {
PreparedStatement pstm = null;
ResultSet rs = null;
User user = null;
if(connection != null){
String sql = "select * from smbms_user where userCode=?";
Object[] params = {
userCode};
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.setCreatedBy(rs.getInt("createdBy"));
user.setCreationDate(rs.getTimestamp("creationDate"));
user.setModifyBy(rs.getInt("modifyBy"));
user.setModifyDate(rs.getTimestamp("modifyDate"));
}
BaseDao.closeResource(null,pstm,rs);
}
return user;
}
}
5.业务层接口
java service接口代码
package com.syj.service.user;
import com.syj.entity.User;
public interface UserService {
//用户登录
public User login(String userCode,String password);
}
6.业务层实现类
java serviceImpl实现类代码
package com.syj.service.user;
import com.syj.dao.BaseDao;
import com.syj.dao.user.UserDao;
import com.syj.dao.user.UserDaoImpl;
import com.syj.entity.User;
import java.sql.Connection;
import java.sql.SQLException;
public class UserServiceImpl implements UserService{
private UserDao userDao;
public UserServiceImpl(){
userDao = new UserDaoImpl();
}
public User login(String userCode, String password) {
Connection connection = null;
User user = null;
connection = BaseDao.getConnection();
try {
user = userDao.getLoginUser(connection,userCode);
} catch (SQLException e) {
e.printStackTrace();
}finally {
BaseDao.closeResource(connection,null,null);
}
return user;
}
}
7.编写Servlet
java 代码
package com.syj.servlet;
import com.syj.entity.User;
import com.syj.service.user.UserService;
import com.syj.service.user.UserServiceImpl;
import com.syj.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 {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String userCode = req.getParameter("userCode");
String userPassword = req.getParameter("userPassword");
UserService userService = new UserServiceImpl();
User user = userService.login(userCode, userPassword);
if(user != null){
req.getSession().setAttribute(Constants.USER_SESSION,user);
resp.sendRedirect("jsp/frame.jsp");
}else{
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
xml代码
<servlet>
<servlet-name>LoginServlet</servlet-name>
<servlet-class>com.syj.servlet.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
三、登陆功能优化
注销功能：
思路：移除Session,返回登录界面
java servlet代码
package com.syj.servlet;
import com.syj.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 {
req.getSession().removeAttribute(Constants.USER_SESSION);
resp.sendRedirect("/login.jsp");
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
}
xml 代码
<!--注销-->
<servlet>
<servlet-name>LogoutServlet</servlet-name>
<servlet-class>com.syj.servlet.LogoutServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LogoutServlet</servlet-name>
<url-pattern>/jsp/logout.do</url-pattern>
</servlet-mapping>
四、登录拦截优化
编写一个过滤器并注册
java 代码
package com.syj.filter;
import com.syj.entity.User;
import com.syj.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;
User user = (User) request.getSession().getAttribute(Constants.USER_SESSION);
if(user==null){
response.sendRedirect("/smbms/error.jsp");
}else{
chain.doFilter(req,resp);
}
}
public void destroy() {
}
}
xml 代码
<!-- 用户登录过滤器-->
<filter>
<filter-name>SysFilter</filter-name>
<filter-class>com.syj.filter.SysFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>SysFilter</filter-name>
<url-pattern>/jsp/*</url-pattern>
</filter-mapping>
测试，登录，注销，权限，以上功能都要保证执行成功
五、密码修改
1.导入前端素材
pwdmodify.jsp
<li.><a.href=“${pageContext.request.contextPath }/jsp/pwdmodify.jsp”>密码修改</li.>
2.写项目，建议从底层向上写
3.UserDao接口
//修改用户密码
public int updatePwd(Connection connection,int id,int password) throws SQLException;
4.UserDao接口实现类
//修改用户密码
public int updatePwd(Connection connection, int id, int 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
//根据用户Id修改密码
public boolean updatePwd(int id,int pwd);
6.UserService实现类
public boolean updatePwd(int id, int pwd) {
Connection connection = null;
boolean flag = false;
//修改密码
try {
connection = BaseDao.getConnection();
if(userDao.updatePwd(connection,id,pwd) > 0){
flag = true;
}
} catch (SQLException e) {
e.printStackTrace();
}finally {
BaseDao.closeResource(connection,null,null);
}
return false;
}
7. servlet控制器层
记得实现复用，需要提取方法
@Override
package com.mario.servlet;
import com.mario.entity.User;
import com.mario.service.user.UserService;
import com.mario.service.user.UserServiceImpl;
import com.mario.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 UserServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String method = req.getParameter("method");
if(method.equals("savepwd") && method != null){
this.updatePwd(req,resp);
}
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
public void updatePwd(HttpServletRequest req, HttpServletResponse resp){
Object obj = req.getSession().getAttribute(Constants.USER_SESSION);
String newpassword = req.getParameter("newpassword");
System.out.println(newpassword);
boolean flag = false;
if(obj != null && newpassword != null){
UserService userService = new UserServiceImpl();
flag = userService.updatePwd(((User) obj).getId(), newpassword);
if(flag){
req.setAttribute("message","修改密码成功");
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("pwdmodify.jsp").forward(req,resp);
} catch (ServletException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
8. 测试
优化密码修改使用Ajax
1.阿里巴巴的fastjson
pom.xml
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.61</version>
</dependency>
2.后台修改的代码
package com.mario.servlet;
import com.alibaba.fastjson.JSONArray;
import com.mario.entity.User;
import com.mario.service.user.UserService;
import com.mario.service.user.UserServiceImpl;
import com.mario.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;
import java.util.Map;
public class UserServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String method = req.getParameter("method");
if(method.equals("savepwd") && method != null){
this.updatePwd(req,resp);
}else if(method.equals("pwdmodify") && method != null){
this.pwdModify(req,resp);
}
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
//修改密码
public void updatePwd(HttpServletRequest req, HttpServletResponse resp){
Object obj = req.getSession().getAttribute(Constants.USER_SESSION);
String newpassword = req.getParameter("newpassword");
System.out.println(newpassword);
boolean flag = false;
if(obj != null && newpassword != null){
UserService userService = new UserServiceImpl();
flag = userService.updatePwd(((User) obj).getId(), newpassword);
if(flag){
req.setAttribute("message","修改密码成功");
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("pwdmodify.jsp").forward(req,resp);
} catch (ServletException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
//验证旧密码,session中有用户的密码
public void pwdModify(HttpServletRequest req, HttpServletResponse resp){
Object obj = req.getSession().getAttribute(Constants.USER_SESSION);
String oldpassword = req.getParameter("oldpassword");
Map<String, String> resultMap = new HashMap<String, String>();
if(obj==null){
resultMap.put("result","sessionerror");
}else if(StringUtils.isNullOrEmpty(oldpassword)){
resultMap.put("result","error");
}else{
String userPassword = ((User) obj).getUserPassword();
if(oldpassword.equals(userPassword)){
resultMap.put("result","true");
}else{
resultMap.put("result","false");
}
}
try {
resp.setContentType("application/json");
PrintWriter writer = resp.getWriter();
writer.write(JSONArray.toJSONString(resultMap));
writer.flush();
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
3.测试
六、用户管理实现
1.获取用户数量
1.UserDao
//查询用户总数
public int getUserCount(Connection connection,String username,int userRole) throws SQLException;
2.UserDaoImpl
public int getUserCount(Connection connection, String username, int userRole) throws SQLException {
PreparedStatement pstm = null;
ResultSet rs = null;
int count = 0;
if(connection != null){
StringBuilder sql = new StringBuilder();
sql.append("select count(1) as count from smbms_user u,smbms_role r where u.userRole = r.id");
ArrayList<Object> list = new ArrayList<Object>();
if(!StringUtils.isNullOrEmpty(username)){
sql.append(" and u.userName like ? ");
list.add("%"+username+"%");
}
if(userRole>0){
sql.append(" and u.userRole = ? ");
list.add(userRole);
}
Object[] params = list.toArray();
rs = BaseDao.execute(connection,pstm,rs,sql.toString(),params);
if(rs.next()){
count = rs.getInt("count");
}
BaseDao.closeResource(null,pstm,rs);
}
return count;
}
3.UserService
//查询记录数
public int getUserCount(String username,int userRole);
4.UserServiceImpl
public int getUserCount(String username, int userRole) {
Connection connection = null;
int count = 0;
try {
connection = BaseDao.getConnection();
count = userDao.getUserCount(connection,username,userRole);
} catch (SQLException e) {
e.printStackTrace();
}finally {
BaseDao.closeResource(connection,null,null);
}
return count;
}
2.用户列表页导入
1.UserDao
//通过用户输入的条件查询用户列表
public List<User> getUserList(Connection connection, String userName, int userRole, int currentPageNo, int pageSize) throws Exception;
2.UserDaoImpl
//通过用户输入的条件查询用户列表
public List<User> getUserList(Connection connection, String userName, int userRole, int currentPageNo, int pageSize) throws Exception {
List<User> userList = new ArrayList<User>();
PreparedStatement pstm=null;
ResultSet rs=null;
if(connection!=null){
StringBuffer sql = new StringBuffer();
sql.append("select u.*,r.roleName as userRoleName from smbms_user u,smbms_role r where u.userRole = r.id");
List<Object> list = new ArrayList<Object>();
if(!StringUtils.isNullOrEmpty(userName)){
sql.append(" and u.userName like ?");
list.add("%"+userName+"%");
}
if(userRole > 0){
sql.append(" and u.userRole = ?");
list.add(userRole);
}
sql.append(" order by creationDate DESC limit ?,?");
currentPageNo = (currentPageNo-1)*pageSize;
list.add(currentPageNo);
list.add(pageSize);
Object[] params = list.toArray();
System.out.println("sql ----> " + sql.toString());
rs = BaseDao.execute(connection,pstm,rs,sql.toString(),params);
while(rs.next()){
User _user = new User();
_user.setId(rs.getInt("id"));
_user.setUserCode(rs.getString("userCode"));
_user.setUserName(rs.getString("userName"));
_user.setGender(rs.getInt("gender"));
_user.setBirthday(rs.getDate("birthday"));
_user.setPhone(rs.getString("phone"));
_user.setUserRole(rs.getInt("userRole"));
_user.setUserRoleName(rs.getString("userRoleName"));
userList.add(_user);
}
BaseDao.closeResource(null, pstm, rs);
}
return userList;
}
3.UserService
//根据条件查询用户列表
public List<User> getUserList(String queryUserName, int queryUserRole, int currentPageNo, int pageSize);
4.UserServiceImpl
public List<User> getUserList(String queryUserName, int queryUserRole, int currentPageNo, int pageSize) {
Connection connection = null;
List<User> userList = null;
try {
connection = BaseDao.getConnection();
userList = userDao.getUserList(connection, queryUserName,queryUserRole,currentPageNo,pageSize);
} catch (Exception e) {
e.printStackTrace();
}finally{
BaseDao.closeResource(connection, null, null);
}
return userList;
}
3.获取角色操作
1.RoleDao
//获取角色列表
public List<Role> getRoleList(Connection connection) throws SQLException;
2.RoleDaoImpl
package com.mario.dao.role;
import com.mario.dao.BaseDao;
import com.mario.entity.Role;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
public class RoleDaoImpl implements RoleDao{
//获取角色列表
public List<Role> getRoleList(Connection connection) throws SQLException {
PreparedStatement pstm = null;
ResultSet rs = null;
ArrayList<Role> rolesList = 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"));
rolesList.add(_role);
}
BaseDao.closeResource(null, pstm, rs);
}
return rolesList;
}
}
3.RoleService
//获取角色列表
public List<Role> getRoleList();
4.RoleServiceImpl
package com.mario.service.role;
import com.mario.dao.BaseDao;
import com.mario.dao.role.RoleDao;
import com.mario.dao.role.RoleDaoImpl;
import com.mario.entity.Role;
import java.sql.Connection;
import java.util.List;
public class RoleServiceImpl implements RoleService{
private RoleDao roleDao;
public RoleServiceImpl(){
roleDao = new RoleDaoImpl();
}
//获取角色列表
public List<Role> getRoleList() {
Connection connection=null;
List<Role> roleList=null;
try {
connection= BaseDao.getConnection();
roleList = roleDao.getRoleList(connection);
} catch (Exception e) {
e.printStackTrace();
}finally {
BaseDao.closeResource(connection,null,null);
}
return roleList;
}
}
4.用户显示的Servlet
- 获取用户前端的数据（查询）
- 判断请求是否需要执行，看参数的值判断
- 为了实现分页，需要计算出当前页面和总页面，页面的大小
- 用户列表展示
- 返回前端
package com.mario.servlet;
import com.alibaba.fastjson.JSONArray;
import com.mario.entity.Role;
import com.mario.entity.User;
import com.mario.service.role.RoleService;
import com.mario.service.role.RoleServiceImpl;
import com.mario.service.user.UserService;
import com.mario.service.user.UserServiceImpl;
import com.mario.util.Constants;
import com.mario.util.PageSupport;
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;
import java.util.List;
import java.util.Map;
public class UserServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String method = req.getParameter("method");
if(method.equals("savepwd") && method != null){
this.updatePwd(req,resp);
}else if(method.equals("pwdmodify") && method != null){
this.pwdModify(req,resp);
}else if(method.equals("query") && method != null){
this.query(req,resp);
}
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
public void query(HttpServletRequest req, HttpServletResponse resp){
//接收前端传来的参数
String queryUserName = req.getParameter("queryname");
String temp = req.getParameter("queryUserRole");//从前端传回来的用户角色码不知是否为空或者是有效角色码，所以暂存起来
String pageIndex = req.getParameter("pageIndex");
int queryUserRole=0;
//通过UserServiceImpl得到用户列表,用户数
UserServiceImpl userService = new UserServiceImpl();
List<User> userList = null;//用来存储用户列表
//设置每页显示的页面容量
int pageSize = 5;
//设置当前的默认页码
int currentPageNo=1;
//前端传来的参数若不符合查询sql语句，即如果用户不进行设置，值为空会影响sql查询，需要给它们进行一些约束
if(queryUserName==null){
//这里为空，说明用户没有输入要查询的用户名，则sql语句传值为""，%%，会查询所有记录
queryUserName="";
}
if(temp!=null && !temp.equals("")){
//不为空，说明前端有传来的用户所设置的userCode，更新真正的角色码
queryUserRole=Integer.parseInt(temp);//强制转换，前端传递的参数都是默认字符串，要转成int类型
}
if(pageIndex!=null){
//说明当前用户有进行设置跳转页面
currentPageNo=Integer.valueOf(pageIndex);
}
//有了用户名和用户角色后可以开始查询了，所以需要显示当前查询到的总记录条数
int totalCount = userService.getUserCount(queryUserName, queryUserRole);
//根据总记录条数以及当前每页的页面容量可以算出，一共有几页，以及最后一页的显示条数
PageSupport pageSupport = new PageSupport();
pageSupport.setCurrentPageNo(currentPageNo);
pageSupport.setPageSize(pageSize);
pageSupport.setTotalCount(totalCount);
//可显示的总页数
int totalPageCount=pageSupport.getTotalPageCount();
//约束首位页，即防止用户输入的页面索引小于1或者大于总页数
if(currentPageNo<1){
currentPageNo=1;
}else if(currentPageNo>totalPageCount){
currentPageNo=totalPageCount;
}
//有了，待查询条件，当前页码，以及每页的页面容量后，就可以给出每页的具体显示情况了
userList = userService.getUserList(queryUserName, queryUserRole, currentPageNo, pageSize);
req.setAttribute("userList",userList);
//通过RoleServiceImpl得到角色表
RoleService roleService = new RoleServiceImpl();
List<Role> roleList = roleService.getRoleList();//用来存储角色表
//得到了用户表与角色表以及各种经过处理后的参数，都存进req中
req.setAttribute("roleList",roleList);
req.setAttribute("totalCount", totalCount);
req.setAttribute("currentPageNo", currentPageNo);
req.setAttribute("totalPageCount", totalPageCount);
req.setAttribute("queryUserName", queryUserName);
req.setAttribute("queryUserRole", queryUserRole);
//将所得到的的所有req参数送回给前端
try {
req.getRequestDispatcher("userlist.jsp").forward(req,resp);
} catch (ServletException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
//修改密码
public void updatePwd(HttpServletRequest req, HttpServletResponse resp){
Object obj = req.getSession().getAttribute(Constants.USER_SESSION);
String newpassword = req.getParameter("newpassword");
System.out.println(newpassword);
boolean flag = false;
if(obj != null && newpassword != null){
UserService userService = new UserServiceImpl();
flag = userService.updatePwd(((User) obj).getId(), newpassword);
if(flag){
req.setAttribute("message","修改密码成功");
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("pwdmodify.jsp").forward(req,resp);
} catch (ServletException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
//验证旧密码,session中有用户的密码
public void pwdModify(HttpServletRequest req, HttpServletResponse resp){
Object obj = req.getSession().getAttribute(Constants.USER_SESSION);
String oldpassword = req.getParameter("oldpassword");
Map<String, String> resultMap = new HashMap<String, String>();
if(obj==null){
resultMap.put("result","sessionerror");
}else if(StringUtils.isNullOrEmpty(oldpassword)){
resultMap.put("result","error");
}else{
String userPassword = ((User) obj).getUserPassword();
if(oldpassword.equals(userPassword)){
resultMap.put("result","true");
}else{
resultMap.put("result","false");
}
}
try {
resp.setContentType("application/json");
PrintWriter writer = resp.getWriter();
writer.write(JSONArray.toJSONString(resultMap));
writer.flush();
writer.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
七、订单管理（增删改查）
八、供应商管理（增删改查）
文章上面的代码只有一部分具体看项目里面的代码…
&
&
&
转载：https://blog.csdn.net/m0_55400356/article/details/125665535
查看评论