useraction.java

这段代码是用struts实现的客户管理系统

package com.tarena.action;

import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;
import org.apache.struts.actions.MappingDispatchAction;

import com.tarena.biz.UserBiz;
import com.tarena.entity.User;
import com.tarena.form.UserForm;
import com.tarena.util.PaginationInfo;

public class UserAction extends MappingDispatchAction {
    private UserBiz userBiz = new UserBiz();

    public ActionForward find(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        ActionForward forward = null;
        try {
            List<User> users = userBiz.find(new User());
            request.setAttribute("users", users);
            forward = mapping.findForward("list");
        } catch (Exception e) {
            e.printStackTrace();
            saveErrors(request, getMessages("error.user.find"));
            forward = mapping.findForward("error");
        }
        return forward;
    }

    public ActionForward edit(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        ActionForward forward = null;
        try {
            UserForm userForm = (UserForm) form;
            User u = userForm.getUser();
            User user = userBiz.findById(u.getId());
            request.setAttribute("user", user);
            forward = mapping.findForward("edit");
        } catch (Exception e) {
            saveErrors(request, getMessages("error.user.find"));
            e.printStackTrace();
            forward = mapping.findForward("error");
        }
        return forward;
    }

    public ActionForward save(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        ActionForward forward = null;
        try {
            UserForm userForm = (UserForm) form;
            User user = userForm.getUser();
            userBiz.modify(user);
            forward = mapping.findForward("success");
        } catch (Exception e) {
            saveErrors(request, getMessages("error.user.save"));
            e.printStackTrace();
            forward = mapping.findForward("error");
        }
        return forward;
    }

    public ActionForward prepareToken(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        saveToken(request);
        return mapping.findForward("add");
    }

    public ActionForward add(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        ActionForward forward = null;
        if (isTokenValid(request, true)) {
            try {
                UserForm userForm = (UserForm) form;
                User user = userForm.getUser();
                boolean isUserExist = userBiz.isUserNameExist(user.getUserName());
                if (isUserExist) {
                    throw new UserNameAlreadyExistException();
                }
                userBiz.add(user);
                forward = mapping.findForward("success");
            } catch (UserNameAlreadyExistException e) {
                throw e;
            } catch (Exception e) {
                e.printStackTrace();
                saveErrors(request, getMessages("error.user.add"));
                forward = mapping.findForward("error");
            }
        } else {
            forward = mapping.findForward("errorToken");
        }
        return forward;
    }

    public ActionForward remove(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        ActionForward forward = null;
        try {
            UserForm userForm = (UserForm) form;
            User user = userForm.getUser();
            userBiz.remove(user.getId());
            forward = mapping.findForward("success");
        } catch (Exception e) {
            e.printStackTrace();
            saveErrors(request, getMessages("error.user.remove"));
            forward = mapping.findForward("error");
        }
        return forward;
    }

    public ActionForward firstPage(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        ActionForward forward = null;
        try {
            HttpSession session = request.getSession();
            PaginationInfo info = (PaginationInfo) session.getAttribute("userPagination");
            info.firstPage();
            List<User> users = userBiz.findByPage(info.getStartRow(), info.getRowPerPage());
            request.setAttribute("users", users);
            forward = mapping.findForward("list");
        } catch (Exception e) {
            e.printStackTrace();
            saveErrors(request, getMessages("error.user.find"));
            forward = mapping.findForward("error");
        }
        return forward;
    }

    public ActionForward lastPage(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        ActionForward forward = null;
        try {
            HttpSession session = request.getSession();
            PaginationInfo info = (PaginationInfo) session.getAttribute("userPagination");
            info.lastPage();
            List<User> users = userBiz.findByPage(info.getStartRow(), info.getRowPerPage());
            request.setAttribute("users", users);
            forward = mapping.findForward("list");
        } catch (Exception e) {
            e.printStackTrace();
            saveErrors(request, getMessages("error.user.find"));
            forward = mapping.findForward("error");
        }
        return forward;
    }

    public ActionForward findBySession(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        ActionForward forward = null;
        try {
            HttpSession session = request.getSession();
            PaginationInfo info = (PaginationInfo) session.getAttribute("userPagination");
            int rows = userBiz.getRowCount();
            int currentPage = info.getCurrentPage();
            info.setRowCount(rows);
            if(currentPage > info.getPageCount()){
                currentPage = info.getPageCount();
            }
            info.gotoPage(currentPage);
            List<User> users = userBiz.findByPage(info.getStartRow(), info.getRowPerPage());
            request.setAttribute("users", users);
            forward = mapping.findForward("list");
        } catch (Exception e) {
            e.printStackTrace();
            saveErrors(request, getMessages("error.user.find"));
            forward = mapping.findForward("error");
        }
        return forward;
    }

    public ActionForward previousPage(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        ActionForward forward = null;
        try {
            HttpSession session = request.getSession();
            PaginationInfo info = (PaginationInfo) session.getAttribute("userPagination");
            info.previousPage();
            List<User> users = userBiz.findByPage(info.getStartRow(), info.getRowPerPage());
            request.setAttribute("users", users);
            forward = mapping.findForward("list");
        } catch (Exception e) {
            e.printStackTrace();
            saveErrors(request, getMessages("error.user.find"));
            forward = mapping.findForward("error");
        }
        return forward;
    }

    public ActionForward nextPage(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        ActionForward forward = null;
        try {
            HttpSession session = request.getSession();
            PaginationInfo info = (PaginationInfo) session.getAttribute("userPagination");
            info.nextPage();
            List<User> users = userBiz.findByPage(info.getStartRow(), info.getRowPerPage());
            request.setAttribute("users", users);
            forward = mapping.findForward("list");
        } catch (Exception e) {
            e.printStackTrace();
            saveErrors(request, getMessages("error.user.find"));
            forward = mapping.findForward("error");
        }
        return forward;
    }

    public ActionForward gotoPage(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        ActionForward forward = null;
        try {
            HttpSession session = request.getSession();
            PaginationInfo info = (PaginationInfo) session.getAttribute("userPagination");
            String pageNo = request.getParameter("pageNo");
            info.gotoPage(Integer.parseInt(pageNo));
            List<User> users = userBiz.findByPage(info.getStartRow(), info.getRowPerPage());
            request.setAttribute("users", users);
            forward = mapping.findForward("list");
        } catch (Exception e) {
            e.printStackTrace();
            saveErrors(request, getMessages("error.user.find"));
            forward = mapping.findForward("error");
        }
        return forward;
    }

    private ActionMessages getMessages(String key) {
        ActionMessages errors = new ActionErrors();
        ActionMessage message = new ActionMessage(key);
        errors.add("error", message);
        return errors;
    }
}