classesaction.java

来自「Java企业级开发项目实践,这是他的附光盘」· Java 代码 · 共 228 行

//---------------------------------------------------------
// Application: eShop of Network
// Author     : eSingle
// File       : ClassesAction.java
//
// Copyright 2002 LandSoft Corp.
// Generated at Mon Nov 18 20:15:26 CST 2002
// Created by caoguangxin
// mailto:[e-mail]
//---------------------------------------------------------

//定义包名
package com.landsoft.eshop.controller;
//引用类包名
import javax.sql.*;
import java.util.*;
import org.apache.commons.logging.LogFactory;
import javax.servlet.http.*;
import javax.servlet.*;
import org.apache.struts.action.*;
import org.apache.struts.util.*;
import com.landsoft.eshop.model.*;
import com.landsoft.eshop.dao.*;
import com.landsoft.eshop.util.*;

public class ClassesAction extends Action {
  //定义日志对象
  private org.apache.commons.logging.Log __log = LogFactory.getFactory().getInstance(this.getClass());
  private static final int PAGE_LENGTH = 20;//定义每页显示记录的数量
  
  public ActionForward execute(ActionMapping mapping, ActionForm form,
      HttpServletRequest request, HttpServletResponse response) {
    ActionForward myforward = null;
    String myaction = mapping.getParameter();//取得当前读者的Action

    if (isCancelled(request)) {
      if (__log.isInfoEnabled()) {
        __log.info(" [Classes] " + mapping.getAttribute() + " - action was cancelled");
      }
      return mapping.findForward("cancel");
    }
    if (__log.isInfoEnabled()) {
      __log.info(" [Classes] action: "+myaction);
    }
    //根据myaciton的值，来执行不同的方法
    if ("".equalsIgnoreCase(myaction)) {
      myforward = mapping.findForward("failure");
    } else if ("VIEW".equalsIgnoreCase(myaction)) {
      myforward = performView(mapping, form, request, response);
    } else if ("EDIT".equalsIgnoreCase(myaction)) {
      myforward = performEdit(mapping, form, request, response);
    } else if ("ADD".equalsIgnoreCase(myaction)) {
      myforward = performAdd(mapping, form, request, response);
    } else if ("SAVE".equalsIgnoreCase(myaction)) {
      myforward = performSave(mapping, form, request, response);
    } else if ("REMOVE".equalsIgnoreCase(myaction)) {
      myforward = performRemove(mapping, form, request, response);
    } else if ("TRASH".equalsIgnoreCase(myaction)) {
      myforward = performTrash(mapping, form, request, response);
    } else if ("LIST".equalsIgnoreCase(myaction)) {
      myforward = performList(mapping, form, request, response);
    } else {
      myforward = mapping.findForward("failure");
    }
    return myforward;
  }

//定义浏览商品类别的Action
  private ActionForward performList(ActionMapping mapping, ActionForm actionForm, HttpServletRequest request, HttpServletResponse response) {
    try {
      DataSource ds = (DataSource) servlet.getServletContext().getAttribute(Action.DATA_SOURCE_KEY);

      ClassesDAO classesDAO = new ClassesDAO(ds);

      int offset;
      int length = PAGE_LENGTH;
      String pageOffset = request.getParameter("pager.offset");
      if (pageOffset == null || pageOffset.equals("")) {
        offset = 0;
      } else {
        offset = Integer.parseInt(pageOffset);
      }

      List classess = classesDAO.list(offset, length);//分页显示商品类别

      String[] objKeys = {"Classes", "list"};
      String objKey = CacheManager.createKey(objKeys);
      Integer size = (Integer)SizeCacheManager.getCache(objKey);
      if(size == null) {
        size = new Integer(classesDAO.getSize("classes", ""));
        SizeCacheManager.putCache(size, objKey, 1);
      }

      String url = request.getContextPath()+"/"+mapping.getPath()+".do";
      String pagerHeader = Pager.generate(offset, size.intValue(), length, url);
      request.setAttribute("pagerHeader", pagerHeader);

      request.setAttribute("CLASSESS", classess);
    } catch (Exception e) {
      generalError(request, e);
      return mapping.findForward("failure");
    }

    return mapping.findForward("success");
  }
//定义查看商品类别Action
  private ActionForward performView(ActionMapping mapping, ActionForm actionForm, HttpServletRequest request, HttpServletResponse response) {
    ClassesForm form = (ClassesForm) actionForm;
    try {
      DataSource ds = (DataSource) servlet.getServletContext().getAttribute(Action.DATA_SOURCE_KEY);

      ClassesDAO classesDAO = new ClassesDAO(ds);

      String typesname = request.getParameter("typesname");
      Classes classes = classesDAO.retrieve(typesname);//检索商品类别
      //如果当前Classes为null时，显示错误信息
      if (classes == null) {
        ActionErrors aes = new ActionErrors();
        aes.add(aes.GLOBAL_ERROR, new ActionError("error.object.notfound", "Classes"));
        saveErrors(request, aes);
        if (__log.isErrorEnabled()) {
          __log.error(" [Classes] Object not found");
        }
      } else {
        org.apache.commons.beanutils.BeanUtils.populate(form, org.apache.commons.beanutils.BeanUtils.describe(classes));//将Classes模型中的值存储
      }
    } catch (Exception e) {
      generalError(request, e);
      return mapping.findForward("failure");
    }
    return mapping.findForward("success");
  }
//定义保存商品类别的Action
  private ActionForward performSave(ActionMapping mapping, ActionForm actionForm, HttpServletRequest request, HttpServletResponse response) {
    ClassesForm form = (ClassesForm) actionForm;

    try {
      DataSource ds = (DataSource) servlet.getServletContext().getAttribute(Action.DATA_SOURCE_KEY);

      ClassesDAO classesDAO = new ClassesDAO(ds);

      Classes classes = new Classes();
      org.apache.commons.beanutils.BeanUtils.populate(classes, org.apache.commons.beanutils.BeanUtils.describe(form));
      int strutsAction = form.getStrutsAction();
      if (strutsAction == ClassesForm.ADD) {
        String typesname = classes.getTypesname();
        if (classesDAO.retrieve(typesname) == null) {
          classesDAO.insert(classes);//增加商品类别
        } else {
          sqlDuplicateError(request, "Classes");
          return mapping.findForward("failure");
        }
      } else if (strutsAction == ClassesForm.EDIT) {
        classesDAO.update(classes);//更新商品类别
      }
    } catch (Exception e) {
      generalError(request, e);
      return mapping.findForward("failure");
    }
    return mapping.findForward("success");
  }
//定义编辑商品类别的方法
  private ActionForward performEdit(ActionMapping mapping, ActionForm actionForm, HttpServletRequest request, HttpServletResponse response) {
    ClassesForm form = (ClassesForm) actionForm;
    form.setStrutsAction(ClassesForm.EDIT);
    try {
      DataSource ds = (DataSource) servlet.getServletContext().getAttribute(Action.DATA_SOURCE_KEY);

      ClassesDAO classesDAO = new ClassesDAO(ds);

      String typesname = request.getParameter("typesname");

      Classes classes = classesDAO.retrieve(typesname);//检索商品类别记录
      org.apache.commons.beanutils.BeanUtils.populate(form, org.apache.commons.beanutils.BeanUtils.describe(classes));
    } catch (Exception e) {
      generalError(request, e);
      return mapping.findForward("failure");
    }
    return mapping.findForward("success");
  }
  //定义增加商品类别的Action
  private ActionForward performAdd(ActionMapping mapping, ActionForm actionForm, HttpServletRequest request, HttpServletResponse response) {
    ClassesForm form = (ClassesForm) actionForm;
    form.setStrutsAction(ClassesForm.ADD);
    return mapping.findForward("success");
  }
//定义删除商品类别Action 
  private ActionForward performRemove(ActionMapping mapping, ActionForm actionForm, HttpServletRequest request, HttpServletResponse response) {
    return performView(mapping, actionForm, request, response);
  }
//定义彻底删除商品类别的Action
  private ActionForward performTrash(ActionMapping mapping, ActionForm actionForm, HttpServletRequest request, HttpServletResponse response) {
    ClassesForm form = (ClassesForm) actionForm;
    try {
      DataSource ds = (DataSource) servlet.getServletContext().getAttribute(Action.DATA_SOURCE_KEY);

      ClassesDAO classesDAO = new ClassesDAO(ds);

      String typesname = request.getParameter("typesname");
      classesDAO.delete(typesname);//删除商品类别
    } catch (Exception e) {
      generalError(request, e);
      return mapping.findForward("failure");
    }
    return mapping.findForward("success");
  }

  //捕获插入重复值的错误
  private void sqlDuplicateError(HttpServletRequest request, String objName) {
    ActionErrors aes = new ActionErrors();
    aes.add(aes.GLOBAL_ERROR, new ActionError("errors.database.duplicate", objName));
    saveErrors(request, aes);
    if (__log.isErrorEnabled()) {
      __log.error(" [Classes] Duplicate key Error - " + objName);
    }
  }
  //捕获一般性错误	
  private void generalError(HttpServletRequest request, Exception e) {
    ActionErrors aes = new ActionErrors();
    aes.add(aes.GLOBAL_ERROR, new ActionError("error.general", e.getMessage()));
    saveErrors(request, aes);
    e.printStackTrace();
    if (__log.isErrorEnabled()) {
      __log.error(" [Classes] Error - " + e.getMessage());
    }
  }
}