import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.io.PrintWriter; import java.io.BufferedReader; import java.util.Enumeration; import java.net.URLDecoder; import java.io.UnsupportedEncodingException; public class HttpRequestServlet extends HttpServlet { private static String htmlHead = ""; private static String htmlTail = ""; private void fieldInfo( PrintWriter o, String name, String info ) { o.print( "" + name + ":" ); o.print( info ); o.print( "
" ); } private void dumpInfo( PrintWriter o, HttpServletRequest request ) { o.print("

url

"); o.print("

"); fieldInfo(o, "method", request.getMethod() ); fieldInfo(o, "servlet-path", request.getServletPath() ); fieldInfo(o, "path-info", request.getPathInfo() ); fieldInfo(o, "query", request.getQueryString() ); o.print("

"); o.print("

headers

"); o.print("

"); Enumeration names = request.getHeaderNames(); while ( names.hasMoreElements() ) { String name = names.nextElement().toString(); fieldInfo(o, name, request.getHeader(name) ); } o.print("

"); } private void dumpQuery( PrintWriter o, String query ) { o.print("

query

"); o.print("

"); String[] pairs = query.split("\\&"); for ( int i=0; i < pairs.length; i++) { String[] fields = pairs[i].split("="); try { String n = URLDecoder.decode(fields[0], "ISO-8859-1"); String v = URLDecoder.decode(fields[1], "ISO-8859-1"); fieldInfo( o, n, v ); } catch( UnsupportedEncodingException ex ) { // ignore } } o.print("

"); } protected void doGet( HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println( htmlHead ); dumpInfo( out, request ); String q = request.getQueryString(); if ( q != null ) { dumpQuery(out, q ); } out.println( htmlTail ); } protected void doPost( HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println( htmlHead ); dumpInfo( out, request ); BufferedReader rd = request.getReader(); out.println("

content

"); int ch; StringBuilder sb = new StringBuilder(); while ( (ch=rd.read()) != -1 ) { sb.append( (char)ch); } dumpQuery(out, sb.toString() ); out.println( htmlTail ); } }