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这篇文章主要介绍了JavaWeb管理系统怎么实现的相关知识，内容详细易懂，操作简单快捷，具有一定借鉴价值，相信大家阅读完这篇JavaWeb管理系统怎么实现文章都会有所收获，下面我们一起来看看吧。
数据库：MySQL
服务器：tomcat
前端js框架：bootstrap
相关技术：JavaScript、servlet、jsp、mvc
1. 列表查询
2. 登录
3. 添加
4. 删除
5. 修改
6. 删除选中
7. 分页查询
8. 复杂条件查询
9.登录(加入验证吗功能)
loginServlet
package z.user.web.servlet;import z.user.domain.User;import z.user.service.UserService;import z.user.service.impl.UserServiceImpl;import org.apache.commons.beanutils.BeanUtils;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.lang.reflect.InvocationTargetException;import java.util.Map;@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.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
UserService service = new UserServiceImpl();
User loginUser = service.login(user); //6.判断是否登录成功
if(loginUser != null){ //登录成功
//将用户存入session
session.setAttribute("user",loginUser); //跳转页面
response.sendRedirect(request.getContextPath()+"/index.jsp");
}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);
}
}checkcodeServlet(验证码)
package z.user.web.servlet;import javax.imageio.ImageIO;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 java.awt.*;import java.awt.image.BufferedImage;import java.io.IOException;import java.util.Random;/**
* 验证码
*/@WebServlet("/checkCodeServlet")public class CheckCodeServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
//服务器通知浏览器不要缓存
response.setHeader("pragma","no-cache");
response.setHeader("cache-control","no-cache");
response.setHeader("expires","0");
//在内存中创建一个长80，宽30的图片，默认黑色背景
//参数一：长
//参数二：宽
//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);
}
}FindUserByPageServlet(查询分页)------------------------
package z.user.web.servlet;import z.user.domain.PageBean;import z.user.domain.User;import z.user.service.UserService;import z.user.service.impl.UserServiceImpl;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 java.io.IOException;import java.util.Map;@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
UserService service = new UserServiceImpl();
PageBean<User> 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);
}
}AddUserServlet(添加)--------------------------------------------------
package z.user.web.servlet;import z.user.domain.User;import z.user.service.UserService;import z.user.service.impl.UserServiceImpl;import org.apache.commons.beanutils.BeanUtils;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 java.io.IOException;import java.lang.reflect.InvocationTargetException;import java.util.Map;@WebServlet("/addUserServlet")public class AddUserServlet extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //1.设置编码
request.setCharacterEncoding("utf-8"); //2.获取参数
Map<String, String[]> map = request.getParameterMap(); //3.封装对象
User user = new User(); try {
BeanUtils.populate(user,map);
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} //4.调用Service保存
UserService service = new UserServiceImpl();
service.addUser(user); //5.跳转到userListServlet
response.sendRedirect(request.getContextPath()+"/userListServlet");
} protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response);
}
}关于“JavaWeb管理系统怎么实现”这篇文章的内容就介绍到这里，感谢各位的阅读！相信大家对“JavaWeb管理系统怎么实现”知识都有一定的了解，大家如果还想学习更多知识，欢迎关注亿速云行业资讯频道。
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