基于javaweb+mysql的jsp+servlet简单学生信息管理系统(java+servlet+mysql+jsp)

基于javaweb+mysql的jsp+servlet简单学生信息管理系统(java+servlet+mysql+jsp)

私信源码获取及调试交流

运行环境

Java≥8、MySQL≥5.7、Tomcat≥8

开发工具

eclipse/idea/myeclipse/sts等均可配置运行

适用

课程设计，大作业，毕业设计，项目练习，学习演示等

功能说明

基于javaweb的JSP+Servlet简单学生信息管理系统(java+servlet+mysql+jsp)

登录：

admin 123456

功能：

登录、注册、学生信息的增删改查管理

        //6.判断是否登录成功
        if (loginStudent != null) {
            //登录成功
            //将用户存入session
            session.setAttribute("user", loginStudent);
            session.setAttribute("loginUser", loginStudent);

            //跳转页面
            response.sendRedirect(request.getContextPath() + "/findUserByPageServlet");
        } else {
            //登录失败
            //提示信息
            request.setAttribute("login_msg", "用户名或密码错误！");
            //跳转登录页面
            request.getRequestDispatcher("/login.jsp").forward(request, response);

        }

    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

/**
 * 验证码
 */

        request.setCharacterEncoding("utf-8");

        //1.获取参数
        String currentPage = request.getParameter("currentPage");//当前页码
        String rows = request.getParameter("rows");//每页显示条数

        if(currentPage == null || "".equals(currentPage)){

            currentPage = "1";
        }

        if(rows == null || "".equals(rows)){
            rows = "5";
        }
        
        //获取条件查询参数
        Map<String, String[]> condition = request.getParameterMap();

        //2.调用service查询
        StudentService service = new StudentServiceImpl();
        PageBean<Student> pb = service.findUserByPage(currentPage,rows,condition);

        System.out.println(pb);

        //3.将PageBean存入request
        request.setAttribute("pb",pb);
        request.setAttribute("condition",condition);//将查询条件存入request
        //4.转发到list.jsp
        request.getRequestDispatcher("/list.jsp").forward(request,response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

/**
 * 这是过滤器
 * 主要负责过滤编码为utf-8及登录拦截，禁止未登录就访问
 */
public class LoginFilter implements Filter {

    //@Override
    public void destroy() {
    }

    //@Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) res;
        HttpSession session = request.getSession();
        //过滤编码
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");
        //移除错误提示
        session.removeAttribute("alert_msg");
        //登录拦截
        String uri = request.getRequestURI();
        String action = request.getParameter("action");
        if (uri.contains("checkCodeServlet") ||uri.contains("loginServlet") ||uri.endsWith("login.jsp") || uri.endsWith("register.jsp") || "register".equalsIgnoreCase(action) || "validationCode".equalsIgnoreCase(action) || "login".equalsIgnoreCase(action) || uri.endsWith(".css") || uri.endsWith(".js") || uri.endsWith(".png") || uri.endsWith(".jpg")) {
            chain.doFilter(request, response);
            return;
        } else if (session.getAttribute("loginUser") == null) {
            response.sendRedirect("login.jsp");
            return;
        }
        chain.doFilter(request, response);
    }

    //@Override
    public void init(FilterConfig arg0) throws ServletException {

		Random r = new Random();
		StringBuffer sb = new StringBuffer();
		for(int i=1;i<=4;i++){
			//产生0到size-1的随机值
			int index = r.nextInt(size);
			//在base字符串中获取下标为index的字符
			char c = base.charAt(index);
			//将c放入到StringBuffer中去
			sb.append(c);
		}
		return sb.toString();
	}
	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		this.doGet(request,response);
	}
}

/**
 * 这是过滤器
 * 主要负责过滤编码为utf-8及登录拦截，禁止未登录就访问
 */
public class LoginFilter implements Filter {

    //@Override
    public void destroy() {
    }

    //@Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req;

		return sb.toString();
	}
	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		this.doGet(request,response);
	}
}

/**
 * 这是过滤器
 * 主要负责过滤编码为utf-8及登录拦截，禁止未登录就访问
 */
public class LoginFilter implements Filter {

    //@Override
    public void destroy() {
    }

    //@Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) res;
        HttpSession session = request.getSession();
        //过滤编码
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");

 */
public class LoginFilter implements Filter {

    //@Override
    public void destroy() {
    }

    //@Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) res;
        HttpSession session = request.getSession();
        //过滤编码
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");
        //移除错误提示
        session.removeAttribute("alert_msg");
        //登录拦截
        String uri = request.getRequestURI();
        String action = request.getParameter("action");
        if (uri.contains("checkCodeServlet") ||uri.contains("loginServlet") ||uri.endsWith("login.jsp") || uri.endsWith("register.jsp") || "register".equalsIgnoreCase(action) || "validationCode".equalsIgnoreCase(action) || "login".equalsIgnoreCase(action) || uri.endsWith(".css") || uri.endsWith(".js") || uri.endsWith(".png") || uri.endsWith(".jpg")) {
            chain.doFilter(request, response);
            return;
        } else if (session.getAttribute("loginUser") == null) {
            response.sendRedirect("login.jsp");
            return;
        }
        chain.doFilter(request, response);
    }

    //@Override
    public void init(FilterConfig arg0) throws ServletException {
    }
}

@WebServlet("/updateUserServlet")
public class UpdateUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.设置编码
        request.setCharacterEncoding("utf-8");
        //2.获取map
        Map<String, String[]> map = request.getParameterMap();
        //3.封装对象
        Student student = new Student();
        try {
            BeanUtils.populate(student,map);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }

        //4.调用Service修改
        StudentService service = new StudentServiceImpl();
        service.updateUser(student);

        //5.跳转到查询所有Servlet
        response.sendRedirect(request.getContextPath()+"/findUserByPageServlet");
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

		//参数三：颜色
		int width = 80;
		int height = 30;
		BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
		
		//获取画笔
		Graphics g = image.getGraphics();
		//设置画笔颜色为灰色
		g.setColor(Color.GRAY);
		//填充图片
		g.fillRect(0,0, width,height);
		
		//产生4个随机验证码，12Ey
		String checkCode = getCheckCode();
		//将验证码放入HttpSession中
		request.getSession().setAttribute("CHECKCODE_SERVER",checkCode);
		
		//设置画笔颜色为黄色
		g.setColor(Color.YELLOW);
		//设置字体的小大
		g.setFont(new Font("黑体",Font.BOLD,24));
		//向图片上写入验证码
		g.drawString(checkCode,15,25);
		
		//将内存中的图片输出到浏览器
		//参数一：图片对象
		//参数二：图片的格式，如PNG,JPG,GIF
		//参数三：图片输出到哪里去
		ImageIO.write(image,"PNG",response.getOutputStream());
	}
	/**
	 * 产生4位随机字符串 
	 */
	private String getCheckCode() {
		String base = "0123456789ABCDEFGabcdefg";
		int size = base.length();
		Random r = new Random();
		StringBuffer sb = new StringBuffer();
		for(int i=1;i<=4;i++){
			//产生0到size-1的随机值
			int index = r.nextInt(size);
			//在base字符串中获取下标为index的字符
			char c = base.charAt(index);
			//将c放入到StringBuffer中去
			sb.append(c);
		}
		return sb.toString();
	}
	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		this.doGet(request,response);
	}
}

	 */
	private String getCheckCode() {
		String base = "0123456789ABCDEFGabcdefg";
		int size = base.length();
		Random r = new Random();
		StringBuffer sb = new StringBuffer();
		for(int i=1;i<=4;i++){
			//产生0到size-1的随机值
			int index = r.nextInt(size);
			//在base字符串中获取下标为index的字符
			char c = base.charAt(index);
			//将c放入到StringBuffer中去
			sb.append(c);
		}
		return sb.toString();
	}
	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		this.doGet(request,response);
	}
}

/**
 * 这是过滤器
 * 主要负责过滤编码为utf-8及登录拦截，禁止未登录就访问
 */
public class LoginFilter implements Filter {

@WebServlet("/findUserByPageServlet")
public class FindUserByPageServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");

        //1.获取参数
        String currentPage = request.getParameter("currentPage");//当前页码
        String rows = request.getParameter("rows");//每页显示条数

        if(currentPage == null || "".equals(currentPage)){

            currentPage = "1";
        }

        if(rows == null || "".equals(rows)){
            rows = "5";
        }
        
        //获取条件查询参数
        Map<String, String[]> condition = request.getParameterMap();

        //2.调用service查询
        StudentService service = new StudentServiceImpl();
        PageBean<Student> pb = service.findUserByPage(currentPage,rows,condition);

        System.out.println(pb);

        //3.将PageBean存入request
        request.setAttribute("pb",pb);
        request.setAttribute("condition",condition);//将查询条件存入request
        //4.转发到list.jsp
        request.getRequestDispatcher("/list.jsp").forward(request,response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

        //登录拦截
        String uri = request.getRequestURI();
        String action = request.getParameter("action");
        if (uri.contains("checkCodeServlet") ||uri.contains("loginServlet") ||uri.endsWith("login.jsp") || uri.endsWith("register.jsp") || "register".equalsIgnoreCase(action) || "validationCode".equalsIgnoreCase(action) || "login".equalsIgnoreCase(action) || uri.endsWith(".css") || uri.endsWith(".js") || uri.endsWith(".png") || uri.endsWith(".jpg")) {
            chain.doFilter(request, response);
            return;
        } else if (session.getAttribute("loginUser") == null) {
            response.sendRedirect("login.jsp");
            return;
        }
        chain.doFilter(request, response);
    }

    //@Override
    public void init(FilterConfig arg0) throws ServletException {
    }
}

@WebServlet("/findUserByPageServlet")
public class FindUserByPageServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("utf-8");

        //1.获取参数
        String currentPage = request.getParameter("currentPage");//当前页码
        String rows = request.getParameter("rows");//每页显示条数

        if(currentPage == null || "".equals(currentPage)){

            currentPage = "1";
        }

        if(rows == null || "".equals(rows)){
            rows = "5";
        }
        
        //获取条件查询参数
        Map<String, String[]> condition = request.getParameterMap();

        //2.调用service查询
        StudentService service = new StudentServiceImpl();
        PageBean<Student> pb = service.findUserByPage(currentPage,rows,condition);

        System.out.println(pb);

        //3.将PageBean存入request
        request.setAttribute("pb",pb);
        request.setAttribute("condition",condition);//将查询条件存入request
        //4.转发到list.jsp
        request.getRequestDispatcher("/list.jsp").forward(request,response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

			//将c放入到StringBuffer中去
			sb.append(c);
		}
		return sb.toString();
	}
	public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		this.doGet(request,response);
	}
}

/**
 * 这是过滤器
 * 主要负责过滤编码为utf-8及登录拦截，禁止未登录就访问
 */
public class LoginFilter implements Filter {

    //@Override
    public void destroy() {
    }

    //@Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) res;
        HttpSession session = request.getSession();
        //过滤编码
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");
        //移除错误提示

@WebServlet("/loginServlet")
public class LoginServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.设置编码
        request.setCharacterEncoding("utf-8");

        //2.获取数据
        //2.1获取用户填写验证码
        String verifycode = request.getParameter("verifycode");

        //3.验证码校验
        HttpSession session = request.getSession();
        String checkcode_server = (String) session.getAttribute("CHECKCODE_SERVER");
        session.removeAttribute("CHECKCODE_SERVER");//确保验证码一次性
        if (checkcode_server != null && !checkcode_server.equalsIgnoreCase(verifycode)) {
            //验证码不正确
            //提示信息
            request.setAttribute("login_msg", "验证码错误！");
            //跳转登录页面
            request.getRequestDispatcher("/login.jsp").forward(request, response);

            return;
        }

        Map<String, String[]> map = request.getParameterMap();
        //4.封装User对象
        User user = new User();
        try {
            BeanUtils.populate(user, map);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }

        //5.调用Service查询

@WebServlet("/updateUserServlet")
public class UpdateUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.设置编码
        request.setCharacterEncoding("utf-8");
        //2.获取map
        Map<String, String[]> map = request.getParameterMap();
        //3.封装对象
        Student student = new Student();
        try {
            BeanUtils.populate(student,map);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }

        //4.调用Service修改
        StudentService service = new StudentServiceImpl();
        service.updateUser(student);

        //5.跳转到查询所有Servlet
        response.sendRedirect(request.getContextPath()+"/findUserByPageServlet");
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

@WebServlet("/updateUserServlet")
public class UpdateUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.设置编码
        request.setCharacterEncoding("utf-8");
        //2.获取map
        Map<String, String[]> map = request.getParameterMap();
        //3.封装对象
        Student student = new Student();
        try {
            BeanUtils.populate(student,map);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }

        //4.调用Service修改
        StudentService service = new StudentServiceImpl();
        service.updateUser(student);

        //5.跳转到查询所有Servlet
        response.sendRedirect(request.getContextPath()+"/findUserByPageServlet");
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }

@WebServlet("/findUserServlet")
public class FindUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.获取id
        String id = request.getParameter("id");
        //2.调用Service查询
        StudentService service = new StudentServiceImpl();
        Student student = service.findUserById(id);

        //3.将user存入request
        request.setAttribute("student", student);
        //4.转发到update.jsp
        request.getRequestDispatcher("/update.jsp").forward(request,response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

@WebServlet("/delSelectedServlet")
public class DelSelectedServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.获取所有id
        String[] ids = request.getParameterValues("uid");
        //2.调用service删除
        StudentService service = new StudentServiceImpl();
        service.delSelectedUser(ids);

        //3.跳转查询所有Servlet
        response.sendRedirect(request.getContextPath()+"/findUserByPageServlet");
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

            e.printStackTrace();
        }

        //4.调用Service保存
        UserService service = new UserServiceImpl();
        service.addUser(user);

        //5.跳转到userListServlet
        response.sendRedirect(request.getContextPath()+"/login.jsp");
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }
}

@WebServlet("/findUserServlet")
public class FindUserServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.获取id
        String id = request.getParameter("id");
        //2.调用Service查询
        StudentService service = new StudentServiceImpl();
        Student student = service.findUserById(id);

        //3.将user存入request
        request.setAttribute("student", student);
        //4.转发到update.jsp
        request.getRequestDispatcher("/update.jsp").forward(request,response);