用Java实现可保存状态的数据库生成XML树，源码来了（10）

用Java实现可保存状态的数据库生成XML树，源码来了（10）

- 中国WEB开发者网络 (http://www.webasp.net)
-- 技术教程 (http://www.webasp.net/article/)
--- 用Java实现可保存状态的数据库生成XML树，源码来了（10） (http://www.webasp.net/article/7/6975.htm)

-- 作者：未知
-- 发布日期： 2003-07-26

2.XMLServlet.java
package com.sitechasia;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.PrintWriter;
import java.io.IOException;

import javax.sql.RowSet;

import com.sitechasia.ejb.*;

import javax.ejb.Handle;

public class XMLServlet extends HttpServlet {
 PrintWriter out;
 private static ResultEdit re;
 private Object ref;
 boolean flag=true;
 private Handle handle=null;
 private static String HostIP = null;
 private static String HostPort = null;

 private static final String CONTENT_TYPEX = "text/xml";
 private static final String CONTENT_TYPEH = "text/html";

 private static final String CONTENT_XSLT = "<?xml-stylesheet type=\"text/xsl\" href=\"/xsl/treefunc.xsl\"?>";
 private static final String CONTENT_XSLC = "<?xml-stylesheet type=\"text/xsl\" href=\"xmltreexsl.xsl\"?>";

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

 /**Process the HTTP Get request*/
 public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 try{
 HttpSession session=request.getSession();

 if ( session.getAttribute("ResultEditHandle")==null) {
 flag=false;
 }
 else {
 flag=true;
 handle=(Handle)session.getAttribute("ResultEditHandle");
 re =(ResultEdit)handle.getEJBObject();
 }
 if (flag){
 RowSet rs = re.getRowSet();
 response.setContentType(CONTENT_TYPEX);
 out = response.getWriter();
 out.println("<?xml version=\"1.0\" encoding=\"gb2312\" ?>");
 if (request.getParameterValues("clickId")==null){
 out.println(CONTENT_XSLT);
 }
 else {
 out.println(CONTENT_XSLC);
 }
 out.println("<project>");
 while(rs.next()){
 if (rs.getString(2).equals("0")){
 if(rs.getString("herf")==null){
 out.println("<node>");
 out.println("<id>"+rs.getString(1)+"</id>");
 out.println("<layer>"+rs.getString(2)+"</layer>");
 out.println("<name>"+rs.getString(3)+"</name>");
 out.println("<value>"+(rs.getString(4))+"</value>");
 out.println("<father>"+rs.getString(5)+"</father>");
 out.println("<href></href>");
 out.println("<target></target>");
 childnode(rs.getString(1));
 out.println("</node>");
 }
 else {
 out.println("<node>");
 out.println("<id>"+rs.getString(1)+"</id>");
 out.println("<layer>"+rs.getString(2)+"</layer>");
 out.println("<name>"+rs.getString(3)+"</name>");
 out.println("<value>"+(rs.getString(4))+"</value>");
 out.println("<father>"+rs.getString(5)+"</father>");
 out.println("<href>"+rs.getString(6)+"</href>");
 out.println("<target>"+rs.getString(7)+"</target>");
 out.println("</node>");
 }
 }
 }
 out.println("</project>");
 rs.close();
 }
 else {
 response.setContentType(CONTENT_TYPEH);
 out = response.getWriter();
 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("errror:"+e.getMessage());
 e.printStackTrace();
 }
 }

 /**Clean up resources
 id 1
 layer 2
 name 3
 value 4
 father 5
 herf 6
 target 7
 */
 public void destroy() {
 }

 public void childnode(String father){
 try{
 RowSet rs = re.getRowSet();
 while(rs.next()){
 if (rs.getString(5).equals(father)){
 if(rs.getString("herf")==null){
 out.println("<node>");
 out.println("<id>"+rs.getString(1)+"</id>");
 out.println("<layer>"+rs.getString(2)+"</layer>");
 out.println("<name>"+rs.getString(3)+"</name>");
 out.println("<value>"+(rs.getString(4))+"</value>");
 out.println("<father>"+rs.getString(5)+"</father>");
 out.println("<href></href>");
 out.println("<target></target>");
 childnode(rs.getString(1));
 out.println("</node>");
 }
 else{
 out.println("<node>");
 out.println("<id>"+rs.getString(1)+"</id>");
 out.println("<layer>"+rs.getString(2)+"</layer>");
 out.println("<name>"+rs.getString(3)+"</name>");
 out.println("<value>"+(rs.getString(4))+"</value>");
 out.println("<father>"+rs.getString(5)+"</father>");
 out.println("<href>"+rs.getString(6)+"</href>");
 out.println("<target>"+rs.getString(7)+"</target>");
 out.println("</node>");
 }
 }
 }
 rs.close();
 }
 catch(Exception e){
 System.out.println(e.getMessage());
 e.printStackTrace();
 }
 }
}

webasp.net