echoashtmlservlet.java

java web 开发,Java Xml 编程指南书籍源码

// servlet Xml2DBS, which sets up commands for the
// Xml2DBTables class

import javax.servlet.*;  // communicate with client
import javax.servlet.http.*; 

import MyNa.utils.Logger;  // saves admin/debug info to file

import MyNa.utils.Env;   // basic package

import MyNa.utils.HtmlWrapper; // sends HTML to client.
import java.io.IOException; // thrown by HtmlWrapper
import java.io.PrintWriter; // for res.getWriter();
import MyNa.utils.MiscDate; // for logging.
import MyNa.xml.EchoAsHtml;



public class EchoAsHtmlServlet extends HttpServlet { 
  String filePath = "MyNa/EchoAsHtml/"; // C:\JRun\jsm-default\MyNa\EchoAsHtml
  String topFileName = "top.htm";  // these are not used now, but may be
  String ctlFileName = "ctl.htm"; // future template/session controls.
  Logger lg;

  public void doGet (HttpServletRequest req, 
                     HttpServletResponse res)
          throws ServletException, IOException{
    doPost(req,res);
  }

  public void doPost (HttpServletRequest req, 
                     HttpServletResponse res)
          throws ServletException, IOException{
    res.setContentType("text/html");
    PrintWriter out=res.getWriter();
    HtmlWrapper W=new HtmlWrapper(out);
    lg=new Logger(); 
    try{
      Env E=new Env(req);
      String myURL=res.encodeURL(req.getRequestURI());
      E.put("xmlServlet",myURL);
      setStr(E,"filePath","",filePath);
      String theXmlData=E.getStr("XmlData");
      if(null==theXmlData){
        W.wrapPage("EchoAsHtml error","no Xml Data Source specified");
        return;
        }
      E.put("echo_inputFileName",theXmlData);
      E.put("echo_out",out);
      EchoAsHtml eah=new EchoAsHtml();
      eah.setEnv(E);
      eah.doIt();
    }catch(Exception ex){
      W.wrapPage("EchoAsHtml doPost failure",""+ex);}
  }


public String setStr(Env E,String resNm,String pre,String nm,String dflt){
  //sets E[resNm] to pre+(getInitParameter(nm) or E[nm] or dflt)
  String val=getInitParameter(nm);
  if(null==val)val=E.getStr(nm);
  if(null==val)val=dflt;
  E.put(resNm,pre+val);
  return pre+val;
}
public String setStr(Env E,String nm,String pre,String dflt){
  //sets E[nm] to pre+(getInitParameter(nm) or E[nm] or dflt)
  return setStr(E,nm,pre,nm,dflt);
}

}