studentmanageaction.java

《JSP网站开发典型模块与实例精讲》一书光盘源码

package org.appfuse.webapp.action;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.action.*;
import org.appfuse.service.StudentManager;
import org.appfuse.model.Student;
import org.appfuse.webapp.form.*;
import java.util.*;
import org.appfuse.service.*;
import org.appfuse.model.*;

/**
 * @author Administrator
 *
 * 更改所生成类型注释的模板为 窗口 > 首选项 > Java > 代码生成 > 代码和注释
 */
public class StudentManageAction
    extends BaseAction {

    private static Log log = LogFactory.getLog(StudentManageAction.class);

    public ActionForward delete(ActionMapping mapping, ActionForm form,
                                HttpServletRequest request,
                                HttpServletResponse response) throws Exception {
        if (log.isDebugEnabled()) {
            log.debug("entering 'delete' method...");
        }
        StudentManager mgr = (StudentManager) getBean("studentManager");
        StudentForm studentForm = (StudentForm) form;
        mgr.removeStudent(studentForm.getStudentid());
        return list(mapping, form, request, response);
    }

    public ActionForward list(ActionMapping mapping, ActionForm form,
                              HttpServletRequest request,
                              HttpServletResponse response
                              ) throws Exception {
        if (log.isDebugEnabled()) {
            log.debug("entering 'list' method...");
        }
        StudentManager mgr = null;
        List lst = null;
        try {
            mgr = (StudentManager) getBean("studentManager");
            lst = mgr.getStudents(new Student());
        }
        catch (Exception es) {
            log.error("in list: ", es);
        }
        request.setAttribute("students", lst);
        return mapping.findForward("list");
    }

    public ActionForward save(ActionMapping mapping, ActionForm form,
                              HttpServletRequest request,
                              HttpServletResponse response
                              ) throws Exception {
        if (log.isDebugEnabled()) {
            log.debug("entering 'save' method...");
        }

        if (isCancelled(request)) {
            return list(mapping, form, request, response);
        }
        StudentManager mgr = (StudentManager) getBean("studentManager");
        StudentForm studentForm = (StudentForm) form;
        Student student = new Student();
        copyProperties(student, studentForm);
        try {
            mgr.saveStudent(student);
        }
        catch (Exception es) {
            log.error(es);
        }
        return list(mapping, form, request, response);
    }

    public ActionForward update(ActionMapping mapping, ActionForm form,
                                HttpServletRequest request,
                                HttpServletResponse response
                                ) throws Exception {
        if (log.isDebugEnabled()) {
            log.debug("entering 'update' method...");
        }
        if (isCancelled(request)) {
            return list(mapping, form, request, response);
        }
        StudentManager mgr = (StudentManager) getBean("studentManager");
        StudentForm studentForm = (StudentForm) form;
        request.setAttribute("student", mgr.getStudent(studentForm.getStudentid()));
        return mapping.findForward("update");
    }

    public ActionForward search(ActionMapping mapping, ActionForm form,
                                HttpServletRequest request,
                                HttpServletResponse response
                                ) throws Exception {
        if (log.isDebugEnabled()) {
            log.debug("entering 'search' method...");
        }
        String no = request.getParameter("studentid");
        if (no == null || no.length() < 1) {
            return list(mapping, form, request, response);
        }
        ArrayList list = new ArrayList(1);
        StudentManager mgr = (StudentManager) getBean("studentManager");
        try {
            list.add(mgr.getStudent(Integer.parseInt(no)));
        }
        catch (Exception es) {
            log.error(es);
        }
        request.setAttribute("students", list);
        return mapping.findForward("list");
    }

    public ActionForward unspecified(ActionMapping mapping, ActionForm form,
                                     HttpServletRequest request,
                                     HttpServletResponse response
                                     ) throws
        Exception {
        return list(mapping, form, request, response);
    }
}