dbmodifyblogservlet.java

java语言中servlet的用法实例

package blogServlet;

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 javax.servlet.http.HttpSession;
/**
 * 将修改后的日志写入数据库
 * @author Administrator
 */
public class DBModifyBlogServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public DBModifyBlogServlet() {
		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();
		
		HttpSession session = request.getSession();
		UserInfo user = (UserInfo)session.getAttribute("LoginUser");
		if(null==user){
			System.out.println("此用户还未登录");
			out.write("你还未登录");
			request.getRequestDispatcher("login.html").forward(request, response);
			return ;
		}
		
		String sqlUpdate = "update userblog set title='"
				+ request.getParameter("title").toString() + "' ,keyword='"
				+ request.getParameter("keyword") + "' ,content='"
				+ request.getParameter("content") +"' where id like '"+request.getParameter("blogID")+"';";
		DaoUserBlog dub = new DaoUserBlog();
		boolean flag = dub.modifyBlog(sqlUpdate);
		if(flag){
			out.println("日志修改成功");
			request.getRequestDispatcher("/ShowUserBlogsServlet").include(request, response);
		}
		else{
			out.println("日志修改失败");
			request.getRequestDispatcher("login.html").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
	}

}