mxzaction.java

这是Java学习的一些常用的例子

//---------------------------------------------------------
// Application: Ch03
// Author     : helpsoft
// File       : MxzAction.java
//
// Copyright 2004 www.helpsoft.org
//开发时间：2004-11-01 01:03:28 CST 2004
// 作者：曹广鑫
// 访问 http://www.helpsoft.org
//---------------------------------------------------------


package org.helpsoft.ch03.controller;

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 org.helpsoft.ch03.model.*;
import org.helpsoft.ch03.dao.*;
import org.helpsoft.ch03.util.*;

public class MxzAction extends Action {
  private org.apache.commons.logging.Log __log = LogFactory.getFactory().getInstance(this.getClass());
  private static final int PAGE_LENGTH = 20;

  public ActionForward execute(ActionMapping mapping, ActionForm form,
      HttpServletRequest request, HttpServletResponse response) {
    ActionForward myforward = null;
    String myaction = mapping.getParameter();

    if (isCancelled(request)) {
      if (__log.isInfoEnabled()) {
        __log.info(" [Mxz] " + mapping.getAttribute() + " - action was cancelled");
      }
      return mapping.findForward("cancel");
    }
    if (__log.isInfoEnabled()) {
      __log.info(" [Mxz] action: "+myaction);
    }
    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 if ("NEWQUERY".equalsIgnoreCase(myaction)) {
      myforward = performnewQuery(mapping, form, request, response);
    } else {
      myforward = mapping.findForward("failure");
    }
    return myforward;
  }


  private ActionForward performList(ActionMapping mapping, ActionForm actionForm, HttpServletRequest request, HttpServletResponse response) {
    try {
      DataSource ds = (DataSource) servlet.getServletContext().getAttribute(Action.DATA_SOURCE_KEY);

      MxzDAO mxzDAO = new MxzDAO(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 mxzs = mxzDAO.list(offset, length);

      String[] objKeys = {"Mxz", "list"};
      String objKey = CacheManager.createKey(objKeys);
      Integer size = (Integer)SizeCacheManager.getCache(objKey);
      if(size == null) {
        size = new Integer(mxzDAO.getSize("mxz", ""));
        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("MXZS", mxzs);
    } catch (Exception e) {
      generalError(request, e);
      return mapping.findForward("failure");
    }

    return mapping.findForward("success");
  }

  private ActionForward performView(ActionMapping mapping, ActionForm actionForm, HttpServletRequest request, HttpServletResponse response) {
    MxzForm form = (MxzForm) actionForm;
    try {
      DataSource ds = (DataSource) servlet.getServletContext().getAttribute(Action.DATA_SOURCE_KEY);

      MxzDAO mxzDAO = new MxzDAO(ds);

      String id = request.getParameter("id");
      Mxz mxz = mxzDAO.retrieve(id);
      if (mxz == null) {
        ActionErrors aes = new ActionErrors();
        aes.add(aes.GLOBAL_ERROR, new ActionError("error.object.notfound", "Mxz"));
        saveErrors(request, aes);
        if (__log.isErrorEnabled()) {
          __log.error(" [Mxz] Object not found");
        }
      } else {
        org.apache.commons.beanutils.BeanUtils.populate(form, org.apache.commons.beanutils.BeanUtils.describe(mxz));
      }
    } catch (Exception e) {
      generalError(request, e);
      return mapping.findForward("failure");
    }
    return mapping.findForward("success");
  }

  private ActionForward performSave(ActionMapping mapping, ActionForm actionForm, HttpServletRequest request, HttpServletResponse response) {
    MxzForm form = (MxzForm) actionForm;

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

      MxzDAO mxzDAO = new MxzDAO(ds);

      Mxz mxz = new Mxz();
      org.apache.commons.beanutils.BeanUtils.populate(mxz, org.apache.commons.beanutils.BeanUtils.describe(form));
      int strutsAction = form.getStrutsAction();
      if (strutsAction == MxzForm.ADD) {
        String id = mxz.getId();
        if (mxzDAO.retrieve(id) == null) {
          mxzDAO.insert(mxz);
        } else {
          sqlDuplicateError(request, "Mxz");
          return mapping.findForward("failure");
        }
      } else if (strutsAction == MxzForm.EDIT) {
        mxzDAO.update(mxz);
      }
    } catch (Exception e) {
      generalError(request, e);
      return mapping.findForward("failure");
    }
    return mapping.findForward("success");
  }

  private ActionForward performEdit(ActionMapping mapping, ActionForm actionForm, HttpServletRequest request, HttpServletResponse response) {
    MxzForm form = (MxzForm) actionForm;
    form.setStrutsAction(MxzForm.EDIT);
    try {
      DataSource ds = (DataSource) servlet.getServletContext().getAttribute(Action.DATA_SOURCE_KEY);

      MxzDAO mxzDAO = new MxzDAO(ds);

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

      Mxz mxz = mxzDAO.retrieve(id);
      org.apache.commons.beanutils.BeanUtils.populate(form, org.apache.commons.beanutils.BeanUtils.describe(mxz));
    } catch (Exception e) {
      generalError(request, e);
      return mapping.findForward("failure");
    }
    return mapping.findForward("success");
  }

  private ActionForward performAdd(ActionMapping mapping, ActionForm actionForm, HttpServletRequest request, HttpServletResponse response) {
    MxzForm form = (MxzForm) actionForm;
    form.setStrutsAction(MxzForm.ADD);
    return mapping.findForward("success");
  }
  private ActionForward performRemove(ActionMapping mapping, ActionForm actionForm, HttpServletRequest request, HttpServletResponse response) {
    return performView(mapping, actionForm, request, response);
  }

  private ActionForward performTrash(ActionMapping mapping, ActionForm actionForm, HttpServletRequest request, HttpServletResponse response) {
    MxzForm form = (MxzForm) actionForm;
    try {
      DataSource ds = (DataSource) servlet.getServletContext().getAttribute(Action.DATA_SOURCE_KEY);

      MxzDAO mxzDAO = new MxzDAO(ds);

      String id = request.getParameter("id");
      mxzDAO.delete(id);
    } catch (Exception e) {
      generalError(request, e);
      return mapping.findForward("failure");
    }
    return mapping.findForward("success");
  }
  private ActionForward performnewQuery(ActionMapping mapping, ActionForm actionForm, HttpServletRequest request, HttpServletResponse response) {
    MxzForm form = (MxzForm) actionForm;
    try {
      DataSource ds = (DataSource) servlet.getServletContext().getAttribute(Action.DATA_SOURCE_KEY);

      MxzDAO mxzDAO = new MxzDAO(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);
      }

      float sr = form.getSr();
      float zc = form.getZc();
      String rq = form.getRq();
      String[] objKeys = {"Mxz", "newQuery", String.valueOf(sr), String.valueOf(zc), String.valueOf(rq)};
      String objKey = CacheManager.createKey(objKeys);
      Integer size = (Integer)SizeCacheManager.getCache(objKey);
      if(size == null) {
        size = new Integer(mxzDAO.getSize("mxz", ""));
        SizeCacheManager.putCache(size, objKey, 1);
      }
      List mxzs = mxzDAO.newQuery(offset, length, sr, zc, rq);
      String url = request.getContextPath()+"/"+mapping.getPath()+".do"+"?sr="+sr+"&zc="+zc+"&rq="+rq;
      String pagerHeader = Pager.generate(offset, size.intValue(), length, url);
      request.setAttribute("pagerHeader", pagerHeader);

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

    return mapping.findForward("success");
  }



  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(" [Mxz] Duplicate key Error - " + objName);
    }
  }

  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(" [Mxz] Error - " + e.getMessage());
    }
  }
}