javaee之信息后台管理实战
学习了servlet和jsp还有数据库的技术后，便自己写了一个信息后台管理的项目，其中包括的功能有：
（一）、用户的登录、注销还有修改密码
（二）、分类的管理以及对分类的增删改查
（三）、产品的管理以及对产品的增删改查和所属的分类管理
在做项目前，先进行准备工作和分析，包括设计层和导入包等，在此我采用的是三层架构的分层模式对这个项目进行分层来设计，
并且对此来个步骤：
一、系统数据库设计
三种表
二、项目基础环境搭建
2.1目录规范
|-shopsys
|-images: 存放项目设计的页面图片
|-css: 存放所有css文件
|-js: 存放javascript文件
|-views: 存放所有项目的页面（jsp）
login.jsp 登录页面
|-main
index.jsp 系统的主页
|-types : 存放所有分类相关的页面
add.jsp
list.jsp
edit.jsp
|-products ：存放产品相关的页面
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|-src
|-gz.itcast.shopsys
|-entity : 存放所有实体对象
|-dao: 存放dao接口
|-impl: 存放dao实现
|-service: 存放service接口
|-impl: 存放service实现
|-web: 表现层类
|-servlet: servlet类
|-action ：struts2类
|-util : 工具类
|-exception: 自定义业务类
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2.2 导入项目导入jar包
1）c3p0连接池
2）dbutils
3）数据库驱动程序
4）common-fileUplaod
2.3 准备项目使用到的工具类
1）C3P0Util : 获取连接池
2）BaseServlet： 通用的servlet类（抽取了每个模块通用的方法）
3）EncodingFilter：过滤所有请求中文数据
4）ValidateCodeUtil: 生成验证码（用servlet生成）
5）MD5Util:密码加密工具
先设计了各个实体类：
Admins：
package gz.itcast.shopsys.entiry;
public class Admins {
private int id;
private String name;
private String password;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
package gz.itcast.shopsys.entiry;
import java.util.Date;
public class Products {
private int id;
private String name;
private double price;
private String descr;
private String img;
private Date addtime;
private Types types;
private Admins admins;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public String getDescr() {
return descr;
}
public void setDescr(String descr) {
this.descr = descr;
}
public String getImg() {
return img;
}
public void setImg(String img) {
this.img = img;
}
public Date getAddtime() {
return addtime;
}
public void setAddtime(Date addtime) {
this.addtime = addtime;
}
public Types getTypes() {
return types;
}
public void setTypes(Types types) {
this.types = types;
}
public Admins getAdmins() {
return admins;
}
public void setAdmins(Admins admins) {
this.admins = admins;
}
}
package gz.itcast.shopsys.entiry;
import java.util.ArrayList;
import java.util.List;
public class Types {
private int id;
private String name;
private String descr;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDescr() {
return descr;
}
public void setDescr(String descr) {
this.descr = descr;
}
}
同时还涉及了一个关于分页的PageBean实体类：
PageBean：
package gz.itcast.shopsys.entiry;
import java.util.List;
public class PageBean {
private List data; //页面数据
private int firstPage = 1; //首页
private int prePage; //上一页
private int nextPage; //下一页
private int totalPage; //总页数，末页
private int curPage; //当前页
private int pageSize = 5; //每页显示的数据
private int totalCount; //总记录数
public List getData() {
return data;
}
public void setData(List data) {
this.data = data;
}
public int getFirstPage() {
return firstPage;
}
public void setFirstPage(int firstPage) {
this.firstPage = firstPage;
}
//上一页，如果为首页，则不能再减1
public int getPrePage() {
return this.getCurPage()==this.getFirstPage()?this.getFirstPage():this.getCurPage()-1;
}
public void setPrePage(int prePage) {
this.prePage = prePage;
}
//下一页，如果为末页则不能在加一
public int getNextPage() {
return this.getCurPage()==this.getTotalPage()?this.getTotalPage():this.getCurPage()+1;
}
public void setNextPage(int nextPage) {
this.nextPage = nextPage;
}
//总页，判断是否总记录数和每页记录取余，不整除则加1
public int getTotalPage() {
return this.getTotalCount()%this.getPageSize()==0?this.getTotalCount()/this.getPageSize():this.getTotalCount()/this.getPageSize()+1;
}
public void setTotalPage(int totalPage) {
this.totalPage = totalPage;
}
//=========================
public int getCurPage() {
return curPage;
}
public void setCurPage(int curPage) {
this.curPage = curPage;
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public int getTotalCount() {
return totalCount;
}
public void setTotalCount(int totalCount) {
this.totalCount = totalCount;
}
}
包括业务逻辑层为Service：
AdminService：
package gz.itcast.shopsys.service.impl;
import gz.itcast.shopsys.dao.AdminDao;
import gz.itcast.shopsys.dao.impl.AdminDaoImpl;
import gz.itcast.shopsys.entiry.Admins;
import gz.itcast.shopsys.exception.LoginErrorException;
import gz.itcast.shopsys.service.AdminService;
import gz.itcast.shopsys.util.MD5Util;
public class AdminServiceImpl implements AdminService {
private AdminDao admindao = new AdminDaoImpl();
/**
* 管理员的登录
*/
public Admins Login(String name, String password) throws LoginErrorException {
String newpassword = MD5Util.md5(password);
Admins admins = admindao.login(name, newpassword);
if(admins==null){
throw new LoginErrorException("用户或者密码错误！");
}
return admins;
}
public void edit(Admins admins) {
// TODO Auto-generated method stub
admindao.save(admins);
}
}
除此还有ProductService、TypesService层....
还有数据访问层Dao：
AdminsDao：
package gz.itcast.shopsys.dao.impl;
import java.sql.SQLException;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import gz.itcast.shopsys.dao.AdminDao;
import gz.itcast.shopsys.entiry.Admins;
import gz.itcast.shopsys.util.C3P0Utils;
public class AdminDaoImpl implements AdminDao {
QueryRunner qr = new QueryRunner(C3P0Utils.getDataSource());
/**
* 后台管理员的登录
*/
public Admins login(String name, String password) {
// TODO Auto-generated method stub
String sql = "select * from admins where name=? and password =?";
try {
return qr.query(sql, new BeanHandler(Admins.class), name,password);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
throw new RuntimeException(e);
}
}
public void save(Admins admins) {
// TODO Auto-generated method stub
String sql ="update admins set password=? where id=?";
try {
qr.update(sql, admins.getPassword(),admins.getId());
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
throw new RuntimeException(e);
}
}
}
其外还有ProductDAo、TypesDao层....
以及页面访问层Servlet和JSP：
AdminsServlet：
package gz.itcast.shopsys.web;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import gz.itcast.shopsys.entiry.Admins;
import gz.itcast.shopsys.exception.LoginErrorException;
import gz.itcast.shopsys.service.AdminService;
import gz.itcast.shopsys.service.impl.AdminServiceImpl;
import gz.itcast.shopsys.util.BaseServlet;
import gz.itcast.shopsys.util.MD5Util;
public class AdminsServlet extends BaseServlet {
private AdminService adminService = new AdminServiceImpl();
public void login(HttpServletRequest request,HttpServletResponse response)
throws ServletException, IOException{
//得到用户名和密码还有验证码
String username = request.getParameter("username");
String password = request.getParameter("password");
String verifycode = request.getParameter("verifycode");
//验证验证码的正确性
String code = (String) request.getSession().getAttribute("verifycode");
if(!verifycode.equalsIgnoreCase(code) || verifycode==null){
request.setAttribute("msg", "验证码错误");
request.getRequestDispatcher("/views/login.jsp").forward(request, response);
return;
}
try {
Admins admins = adminService.Login(username, password);
request.getSession().setAttribute("loginInfo", admins);
request.getRequestDispatcher("/views/main/index.jsp").forward(request, response);
} catch (LoginErrorException e) {
request.setAttribute("msg", e.getMessage());
request.getRequestDispatcher( "/views/login.jsp").forward(request, response);
return;
}
}
public void logout(HttpServletRequest request,HttpServletResponse response)
throws ServletException, IOException{
HttpSession session = request.getSession();
if(session!=null){
session.invalidate();
request.getRequestDispatcher("/views/login.jsp").forward(request, response);
}
}
public void edit(HttpServletRequest request,HttpServletResponse response)
throws ServletException, IOException{
Admins admins = (Admins) request.getSession().getAttribute("loginInfo");
String newps = request.getParameter("newpassword");
String newpassword = MD5Util.md5(newps);
admins.setPassword(newpassword);
try{
adminService.edit(admins);
response.setContentType("text/html;charset=utf-8");
response.getWriter().write("修改成功!3秒后自动跳转到列表 ");
response.setHeader("refresh", "3;url="+request.getContextPath()+"/TypesServlet?action=findByPage");
}catch(Exception e){
}
}
}
除此还有ProductServlet、TypesServlet层....
在这个项目中还运用到了一些工具类，包括设计了一个运用反射技术来减少Servlet在web.xml中配置的代码。
后面还有附带整个项目的源代码：