Socket编程获取162端口来的TRAP信息，却有access denied异常，可我已经修改了安全策略了，为什么阿？

Question

我用udp来获取trap信息，有如下的异常出现．
java.security.AccessControlException: access denied (java.net.SocketPermission localhost:162 listen,resolve)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkListen(Unknown Source)
at java.net.DatagramSocket.bind(Unknown Source)
at java.net.DatagramSocket.<init>(Unknown Source)
at java.net.DatagramSocket.<init>(Unknown Source)
at java.net.DatagramSocket.<init>(Unknown Source)
at uk.co.westhawk.snmp.net.StandardSocket.create(StandardSocket.java:59)
at uk.co.westhawk.snmp.stack.DefaultTrapContext.<init>(DefaultTrapContext.java:136)
at uk.co.westhawk.snmp.stack.DefaultTrapContext.<init>(DefaultTrapContext.java:108)
at uk.co.westhawk.snmp.stack.DefaultTrapContext.getInstance(DefaultTrapContext.java:150)
at trap.init(trap.java:42)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)该异常当我用java　viewer来运行就没有该异常，如果我直接将其下载到机器，就有了上面的异常．可我也已经在java　policy内修改了其属性了：
permission java.net.SocketPermission "10.10.70.39:1-5000", "accept,connect,listen, resol为什么还会有上面的错误？
求求各位高手了！

Answer 1

用socket 可以获得trap报文吗,trap 是用snmp 得到吧

Answer 2

import java.awt.*; 
import javax.swing.*;
import java.util.*;
import java.net.*;
import uk.co.westhawk.snmp.stack.*;
import uk.co.westhawk.snmp.stack.SnmpContext;
import uk.co.westhawk.snmp.pdu.*;
import uk.co.westhawk.snmp.event.*;  
public class trap extends javax.swing.JApplet implements TrapListener
{
    
    /** Creates a new instance of trap */
    public trap() {
    }
    SnmpContext context;
    JTextArea area;
    
    public trap(String propertiesFilename)
    {
        
    }
    String ipaddress;
    DefaultTrapContext defTrap;
    public void init()
    {
        Container content=this.getContentPane();
        area=new JTextArea();
        content.add(area);
       ipaddress="10.10.70.39";
        try 
        {
            defTrap =DefaultTrapContext.getInstance(162);
            defTrap.addUnhandledTrapListener(this);
            context=new SnmpContext("",6);
            context.addTrapListener(this);            System.out.println("ReceiveTrap.init(): " 
                + context.toString());
        }
        catch (java.io.IOException exc)
        {
            System.out.println("ReceiveTrap.init(): IOException " 
                + exc.getMessage());
            exc.printStackTrace();
            System.exit(0);
        }
    
    }
    
    public void trapReceived(TrapEvent evt)
    {
        if (evt.isDecoded())
        {               
            Pdu trapPdu = evt.getPdu();
            
            SnmpContextBasisFace context = trapPdu.getContext();            
            int version = context.getVersion();
            String host = context.getHost();
            int reqId = trapPdu.getReqId();
            
            //trapPdu.getRequestVarbinds();
           
            //area.append("ReceiveTrap.trapReceived():"
             //   + " received decoded trap id " + reqId 
              //  + ", v " + version
              //  + " from host " + host+"\n");
            System.out.println("ReceiveTrap.trapReceived():"
                + " received decoded trap id " + reqId 
                + ", v " + version
                + " from host " + host);           
            area.append(trapPdu.toString());
            System.out.println(trapPdu.toString());
            
        }
        else
        {
            int version = evt.getVersion();
            String host = evt.getHostAddress();
            System.out.println("ReceiveTrap.trapReceived():"
                + " received undecoded trap v " + version
                + " from host " + host);
            
                       
               try {
                        // make a context which matches the unexpected trap.
                        SnmpContextBasisFace tmpcont = new SnmpContext(host,context.getPort(),context.getTypeSocket());
                        byte[] mess = evt.getMessage();
                        // and get it to decode the thing.
                        Pdu got = tmpcont.processIncomingTrap(mess);
                        System.out.println( "got unexpected trap from "+host+" :"+got.toString());
                        tmpcont.destroy();
                    } 
               catch (Exception x) {   x.printStackTrace();}
        
                        }
    }
    
    public void update(Observable o, Object arg)
    {
        
        Pdu pdu = (Pdu) o;
        System.out.println("ReceiveTrap.update(): " + pdu.toString());
    }
    
}我用的第三方的包．import是第三方的包
我最后将第三方的文件和trap.class一起打包成trap.jar．
java的policy不管修改还是不修改，我调试程序，用java　appletviewer　都可以正确获取trap信息．我也修改了policy文件，但是还是出现上面的问题阿！
谢谢您了，帮我好好看看，我都弄了好几天了，难为我这小女子了！