delblogservlet.java

java语言中servlet的用法实例

package blogServlet;

/**
 * 删除日志
 */
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 DelBlogServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public DelBlogServlet() {
		super();
	}

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

	public void service(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		PrintWriter out = response.getWriter();
		//验证用户是否已经登录,若否则重定向到登录页面
		javax.servlet.http.HttpSession session = request.getSession();
		if(null==session.getAttribute("LoginUser")){
			//response.sendRedirect("login.html");
			request.getRequestDispatcher("login.html").forward(request, response);
			return ;
		}
		
		//获取用户名，以便返回显示日志界面
		UserInfo ui = (UserInfo)session.getAttribute("LoginUser");
		String name = ui.getName();
		
		//删除指定的日志，传入参数为日志ID
		String blogID = request.getParameter("id");
		DaoUserBlog dub = new DaoUserBlog();
		boolean delSuccess = dub.DelUserBlog(blogID);
		if(delSuccess){
			out.write("日志删除成功\r\n");
			request.getRequestDispatcher("ShowUserBlogsServlet").include(request, response);
		}else{
			out.write("日志删除失败\r\n");
			request.getRequestDispatcher("ShowUserBlogsServlet").include(request, response);
		}
		out.flush();
		out.close();
	}

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