用Java实现可保存状态的数据库生成XML树，源码来了（9）

用Java实现可保存状态的数据库生成XML树，源码来了（9）

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--- 用Java实现可保存状态的数据库生成XML树，源码来了（9） (http://www.webasp.net/article/7/6976.htm)

-- 作者：未知
-- 发布日期： 2003-07-26

6.3.2.Servlet源码
1.RefreshServlet.java
package com.sitechasia;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;

import java.sql.*;
import sun.jdbc.rowset.*;
import javax.sql.*;

import javax.rmi.*;

import javax.naming.*;

import weblogic.html.*;

import com.sitechasia.ejb.*;

public class RefreshServlet extends HttpServlet {
 PrintWriter out;
 ResultEdit re;
 private static final String CONTENT_TYPE = "text/html";
 private Object ref;
 private static String querySQL = null;
 private static String HostIP = null;
 private static String HostPort = null;

 public void init() throws ServletException {
 }

 public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 try{
 response.setContentType(CONTENT_TYPE);
 out = response.getWriter();

 HttpSession session=request.getSession(true);

 if (request.getMethod().equals("POST")){
 querySQL = request.getParameter("sql");
 HostIP = request.getParameter("ip");
 HostPort = request.getParameter("port");
 Context ctx =getInitialContext(HostIP,HostPort);
 ref = ctx.lookup("ResultEdit");
 ResultEditHome home = (ResultEditHome) PortableRemoteObject.narrow(ref, ResultEditHome.class);
 re = home.create();
 re.setRowSet(querySQL);
 session.setAttribute("ResultEditHandle",re.getHandle());
 session.setAttribute("ResultEditHostIP",HostIP);
 session.setAttribute("ResultEditHostPort",HostPort);
 }

 if (session.getAttribute("ResultEditHandle")!=null){
 out.println("<html><head><title>Enter</title><META HTTP-EQUIV='Refresh' CONTENT='2;url=/xmltree/index.html'/></head>");
 out.println("<body>");
 out.println("<center>Refresh......go to XMLServlet</center></body></html>");
 }
 else {
 out.println("<html><head><title>no EJB message</title><META HTTP-EQUIV='Refresh' CONTENT='2;url=/RefreshPost.html'/></head>");
 out.println("<body>");
 out.println("<center>Refresh...... return RefreshPost.html</center></body></html>");
 }

 }
 catch(Exception e){
 System.out.println("error:"+e.getMessage());
 e.printStackTrace();
 }
 }

 static public Context getInitialContext(String host,String port) throws Exception {
 Properties p = new Properties();
 p.put(Context.INITIAL_CONTEXT_FACTORY,"weblogic.jndi.WLInitialContextFactory");
 p.put(Context.PROVIDER_URL,"t3://"+host+":"+port);
 return new InitialContext(p);
 }

 static public Context getInitialContext() throws Exception {
 Properties p = new Properties();
 p.put(Context.INITIAL_CONTEXT_FACTORY,"weblogic.jndi.WLInitialContextFactory");
 p.put(Context.PROVIDER_URL,"t3://127.0.0.1:80");
 return new InitialContext(p);
 }
}

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