deletecategorycontroller.java.svn-base

本人编写的基于spring + spring mvc + hibernate架构的新闻系统

package org.coldice.webapp.controller;

import java.util.Iterator;

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

import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.coldice.model.Category;
import org.coldice.model.News;
import org.coldice.service.CategoryManager;
import org.coldice.service.NewsManager;
import org.springframework.validation.BindException;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.SimpleFormController;

public class DeleteCategoryController extends SimpleFormController {

	/** Logger for this class and subclasses */
	protected final Log logger = LogFactory.getLog(getClass());

	private CategoryManager categoryManager;

	private NewsManager newsManager;

	/**
	 * @param categoryManager
	 *            the categoryManager to set
	 */
	public void setCategoryManager(CategoryManager categoryManager) {
		this.categoryManager = categoryManager;
	}

	/**
	 * @param newsManager
	 *            the newsManager to set
	 */
	public void setNewsManager(NewsManager newsManager) {
		this.newsManager = newsManager;
	}

	public DeleteCategoryController() {
		// TODO Auto-generated constructor stub
		/** 为服务对象增加一个设置器，比如它能够把表单对象存储在数据库中 */
		setCommandName("category");
		setCommandClass(Category.class);
	}

	protected Object formBackingObject(HttpServletRequest request)
			throws ServletException {

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

		if (StringUtils.isNotEmpty(id)) {
			int categoryid = Integer.parseInt(id);
			return categoryManager.getCategory(categoryid);
		} else {
			return new Category();
		}
	}

	protected ModelAndView onSubmit(HttpServletRequest request,
			HttpServletResponse response, Object command, BindException errors)
			throws Exception {
		if (logger.isDebugEnabled()) {
			logger.debug("entering 'delete' method...");
		}
		Category category = (Category) command;
		// TODO Auto-generated method stub
		if (request.getParameter("delete") != null) {
			for (Iterator i = category.getNewses().iterator(); i.hasNext();) {
				News news = (News) i.next();
				news.setCategory(null);
				newsManager.updateNews(news);
			}
			categoryManager.removeCategory(category);

			logger.debug("delete category successful...");
			return new ModelAndView(getSuccessView());
		}
		return super.onSubmit(request, response, command, errors);
	}

}