新闻发布项目——Servlet类（doDelCategoryServlet ）

package bdqn.newsManageServlet.Servlet;

import java.io.IOException;
import java.io.PrintWriter;

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

import bdqn.newsManageServlet.Service.categoryTBService;
import bdqn.newsManageServlet.Service.Impl.categoryTBServiceImpl;

public class doDelCategoryServlet extends HttpServlet {

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html;charset=utf-8");
		PrintWriter out = response.getWriter();

		//获取id
		int id=Integer.parseInt(request.getParameter("cgid"));
		//创建业务逻辑层的对象
		categoryTBService sgService = new categoryTBServiceImpl();
		int rel = sgService.delCategory(id);
		if (rel > 0) {
		//删除成功！
			out.print("<script>alert('删除成功');location.href='adminManage/manageTopic.jsp';</script>");
		} else if(rel==0) {
			//删除失败
			out.print("<script>alert('删除失败，该类别下有新闻，不能删除');location.href='adminManage/manageTopic.jsp';</script>");
		}else{
			//删除失败
			out.print("<script>alert('删除失败，请联系管理员！！！');location.href='adminManage/manageTopic.jsp';</script>");
		}
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doGet(request, response);
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}