宠物管理系统，我用5分钟就可以把这个系统部署好，内带数据库2005，数据库连接有配置文件，只有修改好就可以部署好系统。

package controller; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletConfig; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import beans.logic.AddPetCommand; import beans.logic.DelOwnerCommand; import beans.logic.DelPetCommand; import beans.logic.DelRecordCommand; import beans.logic.DelVetCommand; import beans.logic.EditVetCommand; import beans.logic.FindPasswordCommand; import beans.logic.ICommand; import beans.logic.LoginCommand; import beans.logic.NullCommand; import beans.logic.PageCommand; import beans.logic.RegisterCommand; import beans.logic.SavaPetCommand; import beans.logic.SaveOwnerCommand; import beans.logic.SavePetRecordCommand; import beans.logic.SaveUpdateOwnerCommand; import beans.logic.SaveUpdatePetCommand; import beans.logic.SaveUpdatePetRecordCommand; import beans.logic.SaveUpdateVetCommand; import beans.logic.SaveVetCommand; import beans.logic.ShowEditOwnerCommand; import beans.logic.ShowEditPetCommand; import beans.logic.ShowEditPetRecordCommand; import beans.logic.ShowOwnCommand; import beans.logic.ShowPetCommand; import beans.logic.ShowPetRecordCommand; import beans.logic.ShowVetCommand; public class Controller extends HttpServlet { private ServletContext context; public void init(ServletConfig config) throws ServletException { //初始化时创建逻辑类实例，存入ServletContext super.init(config); context=config.getServletContext(); context.setAttribute("loginCmd", new LoginCommand("/WEB-INF/pages/main.jsp")); context.setAttribute("addPet", new AddPetCommand("/WEB-INF/pages/addPet.jsp")); //查找宠物信息的业务逻辑 context.setAttribute("showPet", new ShowPetCommand("/WEB-INF/pages/showPet.jsp")); //查找兽医信息的业务逻辑 context.setAttribute("showVet", new ShowVetCommand("/WEB-INF/pages/showVet.jsp")); //查找主人信息的业务逻辑 context.setAttribute("showOwn", new AddPetCommand("/WEB-INF/pages/showOwn.jsp")); //保存宠物信息的业务逻辑 context.setAttribute("savePet", new SavaPetCommand("/WEB-INF/pages/savePet.jsp")); //分页转发 context.setAttribute("page", new PageCommand()); //转向修改页面的业务逻辑 context.setAttribute("updatePet", new ShowPetCommand("/WEB-INF/pages/updatePet.jsp")); context.setAttribute("editPet", new ShowEditPetCommand("/WEB-INF/pages/editPet.jsp")); //转向兽医添加的页面 context.setAttribute("addVet", new NullCommand("/WEB-INF/pages/addVet.jsp")); //保存兽医信息成功后转向显示信息页面的业务逻辑 context.setAttribute("saveVet", new SaveVetCommand("/WEB-INF/pages/saveVet.jsp")); context.setAttribute("updateVet", new ShowVetCommand("/WEB-INF/pages/updateVet.jsp")); context.setAttribute("editVet", new EditVetCommand("/WEB-INF/pages/editVet.jsp")); //转向添加主人信息页面的业务逻辑 context.setAttribute("addOwner", new NullCommand("/WEB-INF/pages/addOwner.jsp")); //保存宠物主人信息的业务逻辑 context.setAttribute("saveOwner", new SaveOwnerCommand("/WEB-INF/pages/saveOwner.jsp")); context.setAttribute("updateOwn", new ShowOwnCommand("/WEB-INF/pages/updateOwn.jsp")); context.setAttribute("editOwn", new ShowEditOwnerCommand("/WEB-INF/pages/editOwner.jsp")); //转向宠物病历新增的页面的业务 context.setAttribute("addPetRecord", new NullCommand("/WEB-INF/pages/addPetRecord.jsp")); //保存添加的宠物的病历的业务逻辑 context.setAttribute("savePetRecord", new SavePetRecordCommand("/WEB-INF/pages/savePetRecord.jsp")); //查找病历的业务逻辑 context.setAttribute("showPetRecord", new ShowPetRecordCommand("/WEB-INF/pages/showPetRecord.jsp")); //转向的业务逻辑 context.setAttribute("updatePetRecord", new NullCommand("/WEB-INF/pages/updatePetRecord.jsp")); context.setAttribute("editPetRecord", new ShowEditPetRecordCommand("/WEB-INF/pages/editPetRecord.jsp")); //修改宠物信息成功的业务逻辑 context.setAttribute("saveUpdatePet", new SaveUpdatePetCommand("/WEB-INF/pages/saveUpdateSuess.jsp")); //修改兽医信息成功的业务逻辑 context.setAttribute("saveUpdateVet", new SaveUpdateVetCommand("/WEB-INF/pages/saveUpdateSuess.jsp")); //修改主人信息成功的业务逻辑 context.setAttribute("saveUpdateOwner", new SaveUpdateOwnerCommand("/WEB-INF/pages/saveUpdateSuess.jsp")); //修改宠物病历信息成功的业务逻辑 context.setAttribute("saveUpdatePetRecord", new SaveUpdatePetRecordCommand("/WEB-INF/pages/saveUpdateSuess.jsp")); context.setAttribute("delPet", new NullCommand("/WEB-INF/pages/showDelPet.jsp")); //删除宠物信息的业务逻辑 context.setAttribute("delPetSuess", new DelPetCommand("/WEB-INF/pages/delSuess.jsp")); context.setAttribute("delVet", new NullCommand("/WEB-INF/pages/showDelVet.jsp")); context.setAttribute("delVetSuess", new DelVetCommand("/WEB-INF/pages/delSuess.jsp")); context.setAttribute("delOwner", new NullCommand("/WEB-INF/pages/delOwner.jsp")); context.setAttribute("delOwnerSuess", new DelOwnerCommand("/WEB-INF/pages/delSuess.jsp")); context.setAttribute("delPetRecord",new NullCommand("/WEB-INF/pages/showDelRecord.jsp")); context.setAttribute("delSuess", new DelRecordCommand("/WEB-INF/pages/delSuess.jsp")); //转向注册页面 context.setAttribute("showRegister", new NullCommand("/WEB-INF/pages/register.jsp")); context.setAttribute("saveRegister", new RegisterCommand("/WEB-INF/pages/saveRegister.jsp")); context.setAttribute("home", new NullCommand("/WEB-INF/pages/main.jsp")); } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request, response); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String cmd=request.getParameter("cmd"); ICommand command=(ICommand)context.getAttribute(cmd); String nextPage=command.execute(request); request.getRequestDispatcher(nextPage).forward(request, response); } @Override public void destroy() { //把逻辑实例移除 context.removeAttribute("loginCmd"); super.destroy(); } }