savetopic.java

功能描述 1） 后台：管理员负责对整个论坛进行管理

package bbs.servlet;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
import bbs.db.TopicDB;
import bbs.bean.BbsTopic;

public class SaveTopic
    extends HttpServlet {
  private static final String CONTENT_TYPE = "text/html; charset=GBK";

  //Initialize global variables
  public void init() throws ServletException {
  }

  //Process the HTTP Get request
  public void doGet(HttpServletRequest request, HttpServletResponse response) throws
      ServletException, IOException {
    response.setContentType(CONTENT_TYPE);
    PrintWriter out = response.getWriter();
    //获得用户名，ID，帖子的标题，帖子的内容
    String topicid = request.getParameter("topicid");
    String name = request.getParameter("username");
    String subject = request.getParameter("subject");
    String content = request.getParameter("contents");
    try{
      BbsTopic obj = new BbsTopic();
      obj.setTid(Integer.parseInt(topicid));
      obj.setUname(name);
      obj.setTtopic(subject);
      obj.setTcontents(content);
      TopicDB db = new TopicDB();
      String message = null;
      //判断修改是否成功
      if(db.update(obj)>0){
        message = "修改贴子成功！";
      }
      else{
        message = "修改贴子失败！";
      }
      request.getRequestDispatcher("usertopic?message="+message+"").forward(request,response);
    }
    catch(Exception ex){
      ex.printStackTrace();
      request.setAttribute("message", "数据库操作发生错误！");
      request.getRequestDispatcher("error.jsp").forward(request, response);

    }

    out.close();
  }

  //Process the HTTP Post request
  public void doPost(HttpServletRequest request, HttpServletResponse response) throws
      ServletException, IOException {
    doGet(request, response);
  }

  //Clean up resources
  public void destroy() {
  }
}