mysql创建db_0106数据库，

创建表

添加一条数据，id int自增，密码：为MD5加密

insert into tb_sys values(null,admin,MD5(123),"系统管理员");

项目目录结构

com.isoft.db包下

db.properties文件

mysql.driver=com.mysql.jdbc.Driver

mysql.dburl=jdbc:mysql://127.0.0.1:3306/db_0106?userSSL=true&useUnicode=true&characterEncoding=UTF8&serverTimezone=GMT

mysql.loginname=root

mysql.loginpass=root

DBConnection.java

package com.isoft.db;

import java.io.IOException;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;

import java.util.Properties;

public class DBConnection {

private Connection conn ;

private static DBConnection newsInstance ;

public static DBConnection getInstance() {

if(null == newsInstance) {

newsInstance = new DBConnection() ;

}

return newsInstance ;

}

private DBConnection() {

Properties pros = new Properties() ;

try {

pros.load(DBConnection.class.getResourceAsStream("db.properties"));

Class.forName(pros.getProperty("mysql.driver")) ;

this.conn = DriverManager.getConnection(

pros.getProperty("mysql.dburl") ,

pros.getProperty("mysql.loginname") ,

pros.getProperty("mysql.loginpass")

) ;

} catch (IOException e) {

e.printStackTrace();

} catch (ClassNotFoundException e) {

e.printStackTrace();

} catch (SQLException e) {

e.printStackTrace();

}

}

public Connection getConn() {

return conn;

}

public void closeConn() {

if(null != this.conn) {

try {

conn.close();

conn = null ;

} catch (SQLException e) {

e.printStackTrace();

}

}

}

}

com.isoft.entity包下

Sys.ava

package com.isoft.entity;

import com.fasterxml.jackson.annotation.JsonIgnore;

import java.io.Serializable;

public class Sys implements Serializable {

private Integer id ;

private String sysname ;

@JsonIgnore

private String syspass ;

private String role ;

public Sys(){}

public Sys(Integer id, String sysname, String syspass, String role) {

this.id = id;

this.sysname = sysname;

this.syspass = syspass;

this.role = role;

}

public Integer getId() {

return id;

}

public void setId(Integer id) {

this.id = id;

}

public String getSysname() {

return sysname;

}

public void setSysname(String sysname) {

this.sysname = sysname;

}

public String getSyspass() {

return syspass;

}

public void setSyspass(String syspass) {

this.syspass = syspass;

}

public String getRole() {

return role;

}

public void setRole(String role) {

this.role = role;

}

@Override

public String toString() {

return "Sys{" +

"id=" + id +

", sysname='" + sysname + '\'' +

", syspass='" + syspass + '\'' +

", role='" + role + '\'' +

'}';

}

}

com.isoft.Dao包下

SysDao.java

package com.isoft.Dao;

import com.isoft.db.DBConnection;

import com.isoft.entity.Sys;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

public class SysDao {

private Connection conn ;

private PreparedStatement psta ;

private String sql ;

public SysDao() {

conn = DBConnection.getInstance().getConn() ;

}

/**

* 管理员登录校验

*/

public Sys loginCheck(String name , String pass) throws SQLException {

sql = "select * from tb_sys where sysname=? and syspass=? " ;

psta = conn.prepareStatement(sql) ;

psta.setString(1 , name);

psta.setString(2 , pass);

ResultSet rs = psta.executeQuery() ;

Sys sys = null ;

if(rs.next()) {

sys = new Sys(rs.getInt(1) , rs.getString(2) , rs.getString(3) ,rs.getString(4)) ;

}

rs.close();

return sys ;

}

/**

* 增加管理员

*/

public int addSys(String name,String pass) throws SQLException {

sql="select * from tb_sys where sysname=?";

psta = conn.prepareStatement(sql) ;

psta.setString(1 , name);

ResultSet rs1=psta.executeQuery();

if(rs1.next()){

return -1;

}else {

sql = "insert into tb_sys(sysname,syspass,role) values(?,?,?)";

psta = conn.prepareStatement(sql);

String str = "系统管理员";

psta.setString(1, name);

psta.setString(2, pass);

psta.setString(3, str);

int rs = psta.executeUpdate();

return rs;

}

}

/**

* 修改管理员密码

*/

public int changePass(int id,String pass) throws SQLException {

sql="update tb_sys set syspass=? where id=?";

psta=conn.prepareStatement(sql);

psta.setString(1,pass);

psta.setInt(2,id);

int rs=psta.executeUpdate();

return rs;

}

}

com.isoft.bean包下

ServerResult.java

package com.isoft.bean;

import java.io.Serializable;

public class ServerResult implements Serializable {

private Integer errorCode ;

private String errorMsg ;

private Object result ;

public ServerResult(){}

public ServerResult(Integer errorCode, String errorMsg, Object result) {

this.errorCode = errorCode;

this.errorMsg = errorMsg;

this.result = result;

}

public Integer getErrorCode() {

return errorCode;

}

public void setErrorCode(Integer errorCode) {

this.errorCode = errorCode;

}

public String getErrorMsg() {

return errorMsg;

}

public void setErrorMsg(String errorMsg) {

this.errorMsg = errorMsg;

}

public Object getResult() {

return result;

}

public void setResult(Object result) {

this.result = result;

}

@Override

public String toString() {

return "ServerResult{" +

"errorCode=" + errorCode +

", errorMsg='" + errorMsg + '\'' +

", result=" + result +

'}';

}

}

com.isoft.filter包下

AuthFilter.java

package com.isoft.filter;

import javax.servlet.*;

import javax.servlet.annotation.WebFilter;

import javax.servlet.annotation.WebInitParam;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import java.io.IOException;

/*

未登录用户不能请求manager目录下的所有动态资源，动态资源Servlet配置时以.do结尾

登录用户将在Session中存储loginuser属性

*/

@WebFilter(urlPatterns = {"/manager/*" , "*.do" , "/admin/*"})

public class AuthFilter implements Filter {

String[] pages ;

public void destroy() {

}

public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {

HttpServletRequest request = (HttpServletRequest) req ;

HttpSession session = request.getSession();

Object obj = session.getAttribute("loginuser") ;

if(null == obj) {

((HttpServletResponse)resp).sendRedirect(request.getContextPath() + "/Login.html");

return ;

}

chain.doFilter(req, resp);

}

public void init(FilterConfig config) throws ServletException {

}

}

com.isoft.service包下

SysService.java

package com.isoft.service;

import com.isoft.Dao.SysDao;

import com.isoft.Util.MD5Util;

import com.isoft.Util.StringUtil;

import com.isoft.entity.Sys;

import java.sql.SQLException;

public class SysService {

private SysDao sysDao ;

public SysService() {

this.sysDao = new SysDao() ;

}

public Sys loginCheck(String name , String pass) {

if(StringUtil.isEmpty(name) || StringUtil.isEmpty(pass)) {

return null ;

}

try {

Sys sys = sysDao.loginCheck(name , MD5Util.getMD5(pass)) ;

return sys ;

} catch (SQLException e) {

e.printStackTrace();

return null ;

}

}

public int addCheck(String name,String pass){

if(StringUtil.isEmpty(name) || StringUtil.isEmpty(pass)) {

return -1 ;

}

try {

int rs= sysDao.addSys(name,pass);

return rs;

} catch (SQLException e) {

e.printStackTrace();

return -1;

}

}

public int changepassCheck(int id,String pass){

if( StringUtil.isEmpty(pass)) {

return -1 ;

}

try {

int rs=sysDao.changePass(id,pass);

return rs;

} catch (SQLException e) {

e.printStackTrace();

return -1;

}

}

}

com.isoft.servlet包下

AddSysServlet.java

package com.isoft.servlet;

import com.isoft.Util.JsonUtil;

import com.isoft.entity.Sys;

import com.isoft.service.SysService;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import java.io.IOException;

import java.util.HashMap;

import java.util.Map;

@WebServlet( "/sys/AddSysServlet")

public class AddSysServlet extends HttpServlet {

private SysService sysService ;

public AddSysServlet() {

this.sysService = new SysService() ;

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

doGet(request,response);

}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

String name = request.getParameter("addsysname") ;

String pass = request.getParameter("addsyspass") ;

int rs =sysService.addCheck(name,pass);

// response.sendRedirect(request.getContextPath()+"/admin/ManagerIndex.html");

Map map = new HashMap<>() ;

int errorCode ;

String errorMsg ;

if(rs == -1) {

errorCode = 1;

errorMsg = " add defeat！" ;

} else {

errorCode = 0 ;

errorMsg = "add seccess!" ;

// 信息存入Session

}

map.put("errorCode" , errorCode) ;

map.put("errorMsg" , errorMsg) ;

response.getWriter().print(JsonUtil.obj2JsonStr(map));

}

}

太多不想复制了，下面有下载链接，去copy吧

com.isoft.Util包下

去copy吧

web下的目录结构

admin内的html为用户登录后可以访问的页面

login.html

登录成功后

只有几个小功能，但里面有挺多细节的问题，代码没问题。