modelsaveaction.java

Java/J2EE框架Jdon-Framework系统的Sample

/**
 * Copyright 2005 Jdon.com
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

package com.jdon.strutsutil;

import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionError;
import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;


import com.jdon.util.Debug;

import com.jdon.controller.events.EventModel;
import com.jdon.controller.model.Model;

import com.jdon.model.ModelHandler;
import com.jdon.model.ModelForm;
import com.jdon.model.ModelManager;
import com.jdon.model.ModelKey;
import com.jdon.model.mapping.ModelMapping;
import com.jdon.controller.WebAppUtil;
import javax.servlet.ServletContext;
import com.jdon.model.ModelManagerRegistry;
import com.jdon.controller.ContainerClient;

/**
 * 接受数据保存操作，如新增保存、修改保存或删除等数据库操作
 *  无需继承实现 直接配置使用
 * 接受页面输入，保存页面数据到数据库
 * 根据前台jsp页面中action判断是新增保存还是编辑保存
 * <action name="productForm" type="com.jdon.strutsutil.ModelSaveAction" input="/admin/product.jsp"  scope="request" path="/admin/saveProductAction">
 *    <forward name="success" path="/admin/productOk.jsp" />
 *    <forward name="failure" path="/admin/productOk.jsp" />
 * </action>
 *
 * <p>Copyright: Jdon.com Copyright (c) 2003</p>
 * <p></p>
 * @author banq
 * @version 1.0
 */
public class ModelSaveAction extends Action {

  private final static String module = ModelSaveAction.class.getName();
  private ContainerClient containerClient = new ContainerClient();
  private ModelManager modelManager;


  public ActionForward execute(ActionMapping actionMapping,
                               ActionForm actionForm,
                               HttpServletRequest request,
                               HttpServletResponse response) throws
      Exception {

    if (modelManager == null){
      ServletContext sc = this.getServlet().getServletContext();
      modelManager = (ModelManager)containerClient.getPOJOService(ModelManagerRegistry.MM_NAME, sc);
    }


    init(actionMapping, request);


    EventModel em = null;
    String formName = FormBeanUtil.getFormName(actionMapping);

    ModelHandler modelHandler = modelManager.borrowtHandlerObject(formName);
    try {

      ModelForm form = getModelForm(modelHandler,actionForm,request);
      Model model = makeModel(actionMapping, actionForm, request, modelHandler);
      modelHandler.formCopyToModel(form, model);

      em = new EventModel(); //创建一个事件，与EJB实现通讯，并从事件中获取处理出错情况
      em.setActionName(module);
      em.setModel(model); //将model数据赋予事件
      em.setActionType(FormBeanUtil.actionTransfer(form.getAction())); //设置事件操作类型

      Debug.logVerbose(" save data to database ... ", module);
      modelHandler.serviceAction(em, request);

    } catch (Exception ex) {
      Debug.logError("please check your ejb 、 model or form :" + ex, module);
      throw new Exception("System error! please call system Admin." + ex);
    } finally {
      modelManager.returnHandlerObject(modelHandler);
    }

    if (em.getErrors() != null) { //处理出错
      Debug.logError(" save error!! " + em.getErrors(), module);
      ActionErrors errors = new ActionErrors();
      ActionError error = new ActionError(em.getErrors());
      errors.add(ActionErrors.GLOBAL_ERROR, error);
      saveErrors(request, errors);
      return actionMapping.findForward(FormBeanUtil.FORWARD_FAILURE_NAME);
    } else {
//      clearModelCache(em);
      Debug.logVerbose(" save successfully ... ", module);
      return actionMapping.findForward(FormBeanUtil.FORWARD_SUCCESS_NAME);
    }

  }

  private void init(ActionMapping actionMapping, HttpServletRequest request) throws
      Exception {
//    FormBeanUtil.removeActionForm(actionMapping, request);
    checkConfigName(actionMapping);

  }

  /**
   * 由ModelHandler的initForm生成一个新的ModelForm
   * 将载有用户数据
   * @param modelHandler
   * @param actionForm
   * @param request
   * @return
   * @throws java.lang.Exception
   */
  private ModelForm getModelForm(ModelHandler modelHandler,
                                 ActionForm actionForm,
                                 HttpServletRequest request) throws Exception {

    if (actionForm == null){
         throw new Exception(" must define a name value in action config.");
    }
    ModelForm strutsForm = (ModelForm) actionForm;
    String action = strutsForm.getAction();
    if ( (action == null) || (action.length() == 0))
       throw new Exception(" Jsp need field : <html:hidden property=action />");


//    ModelForm newForm = modelHandler.initForm(request);
//    PropertyUtils.copyProperties(newForm, strutsForm);
    return strutsForm;

  }

  /**
   *
   * @param actionMapping
   * @param actionForm
   * @param request
   * @return Model
   * @throws java.lang.Exception
   */
  private Model makeModel(ActionMapping actionMapping, ActionForm actionForm,
                          HttpServletRequest request, ModelHandler modelHandler) throws Exception {
    String formName = actionMapping.getName();
    if (formName == null)
      throw new Exception("no define the FormName in struts_config.xml");

    ModelMapping modelMapping = modelHandler.getModelMapping();
    String keyName = modelMapping.getKeyName();
    String keyValue = request.getParameter(keyName);

    ModelKey modelKey = new ModelKey(keyValue, formName);
    Model model = modelManager.getCache(modelKey);
    if (model != null) {//有缓存，则清除对应的缓存
       modelManager.removeCache(keyValue);
    }else{//缓存没有，则生成新的空白的model
      Debug.logVerbose(" no model cache, keyName is " + keyName, module);
      model = modelManager.getModelObject(formName);
    }

    return model;
  }


  private void checkConfigName(ActionMapping actionMapping) throws Exception {
    if (actionMapping.findForward(FormBeanUtil.FORWARD_FAILURE_NAME) == null)
      Debug.logError(
          "not found the forward name '" + FormBeanUtil.FORWARD_FAILURE_NAME +
          "' in struts-config.xml", module);
    else if (actionMapping.findForward(FormBeanUtil.FORWARD_SUCCESS_NAME) == null)
      Debug.logError(
          "not found the forward name '" + FormBeanUtil.FORWARD_SUCCESS_NAME +
          "' in struts-config.xml", module);

  }

}