怎样才能取得服务器端的环境变量信息！

java 中有个 AppServerLink，这个bean 里有个getResponseHeader ( )方法可以从应用服务器返回HTTP 报头，还有一些方法可以查一下，不知道是不是你要用的！

解决方案 »

  1.   

    public class ShowVariables extends HttpServlet {
      public void doGet(HttpServletRequest request,
                        HttpServletResponse response)
          throws ServletException, IOException {
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        String[][] variables =
          { { "AUTH_TYPE", request.getAuthType() },
            { "CONTENT_LENGTH",
              String.valueOf(request.getContentLength()) },
            { "CONTENT_TYPE", request.getContentType() },
            { "DOCUMENT_ROOT",
              getServletContext().getRealPath("/") },
            { "PATH_INFO", request.getPathInfo() },
            { "PATH_TRANSLATED", request.getPathTranslated() },
            { "QUERY_STRING", request.getQueryString() },
            { "REMOTE_ADDR", request.getRemoteAddr() },
            { "REMOTE_HOST", request.getRemoteHost() },
            { "REMOTE_USER", request.getRemoteUser() },
            { "REQUEST_METHOD", request.getMethod() },
            { "SCRIPT_NAME", request.getServletPath() },
            { "SERVER_NAME", request.getServerName() },
            { "SERVER_PORT",
              String.valueOf(request.getServerPort()) },
            { "SERVER_PROTOCOL", request.getProtocol() },
            { "SERVER_SOFTWARE",
              getServletContext().getServerInfo() }
          };
        String title = "Servlet Example: Showing CGI Variables";
        String docType =
          "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 " +
          "Transitional//EN\">\n";
        out.println(docType +
                    "<HTML>\n" +
                    "<HEAD><TITLE>" + title + "</TITLE></HEAD>\n" +
                    "<BODY BGCOLOR=\"#FDF5E6\">\n" +
                    "<CENTER>\n" +
                    "<H1>" + title + "</H1>\n" +
                    "<TABLE BORDER=1>\n" +
                    "  <TR BGCOLOR=\"#FFAD00\">\n" +
                    "    <TH>CGI Variable Name<TH>Value");
        for(int i=0; i<variables.length; i++) {
          String varName = variables[i][0];
          String varValue = variables[i][1];
          if (varValue == null)
            varValue = "<I>Not specified</I>";
          out.println("  <TR><TD>" + varName + "<TD>" + varValue);
        }
        out.println("</TABLE></CENTER></BODY></HTML>");
      }  /** POST and GET requests handled identically. */  public void doPost(HttpServletRequest request,
                         HttpServletResponse response)
          throws ServletException, IOException {
        doGet(request, response);
      }
    }
      

  2.   

    JAVA里面就有：System.getProperty("java.class.path");