📄 insertnewblogservlet.java
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package blogServlet;
/**
* 在数据库中插入用户日志
*/
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 InsertNewBlogServlet extends HttpServlet {
private static boolean on = true;
/**
* Constructor of the object.
*/
public InsertNewBlogServlet() {
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 {
System.out.println(" -----------Enter InsertNewBlogServlet first: ");
//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();
UserInfo user = (UserInfo)session.getAttribute("LoginUser");
if(null==user){
//测试
System.out.println(" -----------Enter InsertNewBlogServlet second: ");
request.getRequestDispatcher("login.html").forward(request, response);
return ;
}
PrintWriter out = response.getWriter();
String userName = user.getName();
//防重复提交
if(!on){
System.out.println("重复提交问题：");
request.getRequestDispatcher("ShowUserBlogsServlet").include(request, response);
return ;
}
String title = request.getParameter("title");
String keyword = request.getParameter("keyword");
String content = request.getParameter("content");
UserBlog ui = new UserBlog();
ui.setTitle(title);
ui.setKeyword(keyword);
ui.setContent(content);
DaoUserBlog dub = new DaoUserBlog();
on = false;//正在提交，拒绝新来的请求
boolean flag = dub.newUserBlog(userName,ui);
if(flag){
out.write("日志创建成功");
on = true;
request.getRequestDispatcher("ShowUserBlogsServlet").include(request, response);
}
else{
out.println("<HTML>");
out.println("<HEAD><TITLE>apologized</TITLE></HEAD><BODY>");
out.println("apologized");
out.println("</BODY>");
out.println("<HTML>");
}
out.flush();
out.close();
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
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