用Java实现可保存状态的数据库生成XML树，源码来了（11）

2022-07-15 80酷酷网 80kuku.com

　　xml|生成xml|数据|数据库3. XMLTreeXSL.java
package com.sitechasia;

import javax.servlet.*;
import javax.servlet.http.*;

import java.io.PrintWriter;
import java.io.IOException;

public class XMLTreeXSL extends HttpServlet {
    PrintWriter out;
    boolean flag=true;

        private static final String CONTENT_TYPE = "text/xsl";
        private static final String CONTENT_XSL = "<?xml version=\"1.0\" encoding=\"gb2312\" ?><xsl:stylesheet xmlns:xsl=\"http://www.w3.org/TR/WD-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;
                    }
                    if (flag) {
                    javax.servlet.http.Cookie cookies[] = request.getCookies();
                    String t_click_id = null;

                        response.setContentType(CONTENT_TYPE);
                        out = response.getWriter();
                        out.println(CONTENT_XSL);
                        out.println("<xsl:template match=\"/\">");
                        out.println("<HTML>");
                        out.println("<HEAD><STYLE>body{FONT-SIZE: 10pt;}</STYLE></HEAD>");
                        out.println("<BODY><xsl:apply-templates select=\"//node\"/></BODY></HTML></xsl:template>");
                        if ((cookies == null)||(cookies.length == 0)){
                            out.println("No Clicked Node");
                        }
                        else {
                            for(int i = 0;i < cookies.length; i++){
                                javax.servlet.http.Cookie c =cookies[i];
                                if ( c.getName().equals("ClickId")){
                                    t_click_id = c.getValue();
                                    out.println("<xsl:template match=\"node\">");

                                    out.println("<xsl:if test=\".[number(id) $eq$ "+c.getValue()+"]\">");
                                    out.println("当前点击节点的序号：<xsl:value-of select=\"id\"/><br/>");
                                    out.println("节点名称：<xsl:value-of select=\"value\"/><br/>");
                                    out.println("子节点为：<hr/>");
                                    out.println("<xsl:for-each select=\"./node[number(father) $eq$ "+t_click_id+"]\">");
                                    out.println("序号：<xsl:value-of select=\"id\"/><br/>");
                                    out.println("名称：<xsl:value-of select=\"value\"/><br/>");
                                    out.println("</xsl:for-each>");
                                    out.println("</xsl:if>");
                                    out.println("</xsl:template>");
                                    out.println("</xsl:stylesheet>");
                                }
                            }
                        }
                    }
                }
                catch(Exception e){
                           System.out.println("errror:"+e.getMessage());
                    e.printStackTrace();
                }
        }

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

4.Servlet的配置,web.xml文件
<?xml version="1.0" ?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 1.2//EN" "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
<web-app>
<servlet>
  <servlet-name>
    xmlservlet
  </servlet-name>
  <servlet-class>
    com.sitechasia.XMLServlet
  </servlet-class>
</servlet>
<servlet-mapping>
  <servlet-name>
    xmlservlet
  </servlet-name>
  <url-pattern>
    xs
  </url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>
    RefreshServlet
  </servlet-name>
  <servlet-class>
    com.sitechasia.RefreshServlet
  </servlet-class>
</servlet>
<servlet-mapping>
  <servlet-name>
    RefreshServlet
  </servlet-name>
  <url-pattern>
    rs
  </url-pattern>
</servlet-mapping>

<servlet>
  <servlet-name>
    xmltreexsl
  </servlet-name>
  <servlet-class>
    com.sitechasia.XMLTreeXSL
  </servlet-class>
</servlet>

<servlet-mapping>
  <servlet-name>
    xmltreexsl
  </servlet-name>
  <url-pattern>
    xmltreexsl.xsl
  </url-pattern>
</servlet-mapping>
</web-app>