managecategory.java

博客管理系统。安装说明： 1、在SQLSERVER中创建blog数据库并创建登陆帐号blog：blog

package huc.blog.servlet;

import huc.blog.bean.Category;
import huc.blog.bean.User;
import huc.blog.op.CategoryOp;
import huc.blog.util.ParamUtils;

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;

public class ManageCategory extends HttpServlet {

	private static final long serialVersionUID = 1L;

	/**
	 * 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 {
		doPost(request, response);
	}

	/**
	 * 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 {

		User user = (User)ParamUtils.getObjectAttribute(request.getSession(), "loginUser", null);
		
		if(user == null){
			response.sendRedirect("../");
		}
		else{
			String cmd = ParamUtils.getParameter(request, "cmd", "");
			String categoryName = ParamUtils.getParameter(request, "categoryName", "");
			
			String message = "";
			
			CategoryOp categoryOp = new CategoryOp();
			if(cmd.equals("add")){
				Category category = new Category();
				category.setCategoryName(categoryName);
				category.setUserid(user.getId());
				if(categoryOp.checkCategory(category)){
					message = "exist";
				}
				else{
					category = categoryOp.add(category);
					
					if(category != null){
						message = category.getId();
					}
				}
				
				response.setContentType("text/html;charset=UTF-8");
				PrintWriter out = response.getWriter();
				out.print(message);
			}
		}
	}

}