为什么我在下面的程序中遇到不满意的链接错误? 导入jpcap.*; 导入jpcap.packet.*; 导入java.io.*; 导入jpcap.packet.TCPPacket.*; 导入java.io.*; 导入jpcap.JpcapCaptor.*; 类网络实现PacketReceiver{ System.out.println(System.getProperty(“java.library.path”); 字符串sp=null; 字符串dp=null; 字符串窗口=null; 字符串序列=null; 字符串确认=null; FileWriter ff=null; 字符串da=null; 公共无效接收数据包(数据包pt){ 试一试{ if(TCPPacket的pt实例){ TCPPacket tp=(TCPPacket)pt; ff=新的文件编写器(“da.txt”,true); sp=新整数(tp.src_port).toString(); dp=新整数(tp.dst_端口).toString(); window=新整数(tp.window).toString(); sequence=新的Long(tp.sequence).toString(); 确认=新长(tp.ack_num).toString(); 字节[]dat=tp.data; da=新字符串(dat); ff.write(“\r\n源端口为:-”+sp); ff.write(“\r\n设计端口为:-”+dp); ff.写入(“\r\n序列号为:-”+序列); ff.写入(“\r\n确认号为:-”+确认); ff.write(“\r\n rsv1标志的状态为:-”+tp.rsv1); ff.write(“\r\n rsv2标志的状态为:-”+tp.rsv2); ff.write(“\r\n同步标志的状态为:-”+tp.Syn); ff.write(“\r\n Urg标志的状态为:-”+tp.Urg); ff.write(“\r\n Fin标志的状态为:-”+tp.Fin); ff.写入(“\r\n数据:-”+da); ff.写入(“\r\n”); ff.写入(“\r\n”); ff.close(); } }捕获(例外e){ System.out.println(e.getMessage()); } } 公共静态void main(字符串args[])引发IOException{ int i; 试一试{ NetworkInterface[]devices=JpcapCaptor.getDeviceList(); //对于每个网络接口 对于(i=0;i
的Javadoc非常简单。您缺少jcap所需的一些库为什么我在下面的程序中遇到不满意的链接错误? 导入jpcap.*; 导入jpcap.packet.*; 导入java.io.*; 导入jpcap.packet.TCPPacket.*; 导入java.io.*; 导入jpcap.JpcapCaptor.*; 类网络实现PacketReceiver{ System.out.println(System.getProperty(“java.library.path”); 字符串sp=null; 字符串dp=null; 字符串窗口=null; 字符串序列=null; 字符串确认=null; FileWriter ff=null; 字符串da=null; 公共无效接收数据包(数据包pt){ 试一试{ if(TCPPacket的pt实例){ TCPPacket tp=(TCPPacket)pt; ff=新的文件编写器(“da.txt”,true); sp=新整数(tp.src_port).toString(); dp=新整数(tp.dst_端口).toString(); window=新整数(tp.window).toString(); sequence=新的Long(tp.sequence).toString(); 确认=新长(tp.ack_num).toString(); 字节[]dat=tp.data; da=新字符串(dat); ff.write(“\r\n源端口为:-”+sp); ff.write(“\r\n设计端口为:-”+dp); ff.写入(“\r\n序列号为:-”+序列); ff.写入(“\r\n确认号为:-”+确认); ff.write(“\r\n rsv1标志的状态为:-”+tp.rsv1); ff.write(“\r\n rsv2标志的状态为:-”+tp.rsv2); ff.write(“\r\n同步标志的状态为:-”+tp.Syn); ff.write(“\r\n Urg标志的状态为:-”+tp.Urg); ff.write(“\r\n Fin标志的状态为:-”+tp.Fin); ff.写入(“\r\n数据:-”+da); ff.写入(“\r\n”); ff.写入(“\r\n”); ff.close(); } }捕获(例外e){ System.out.println(e.getMessage()); } } 公共静态void main(字符串args[])引发IOException{ int i; 试一试{ NetworkInterface[]devices=JpcapCaptor.getDeviceList(); //对于每个网络接口 对于(i=0;i,java,jpcap,unsatisfiedlinkerror,Java,Jpcap,Unsatisfiedlinkerror,的Javadoc非常简单。您缺少jcap所需的一些库 将来,当您遇到不理解的异常时,javadocs是一个很好的起点。未满足LinkError意味着尚未加载“JpcapCaptor”本机库 import jpcap.*; import jpcap.packet.*; import java.io.*; import jpcap.packet.TCPPacket.*; import java.io.*; import jpcap.JpcapCaptor.*; class Network imp
将来,当您遇到不理解的异常时,javadocs是一个很好的起点。未满足LinkError意味着尚未加载“JpcapCaptor”本机库
import jpcap.*;
import jpcap.packet.*;
import java.io.*;
import jpcap.packet.TCPPacket.*;
import java.io.*;
import jpcap.JpcapCaptor.*;
class Network implements PacketReceiver {
System.out.println(System.getProperty("java.library.path"));
String sp=null;
String dp=null;
String window=null;
String sequence=null;
String acknowledge=null;
FileWriter ff=null;
String da=null;
public void receivePacket(Packet pt) {
try {
if(pt instanceof TCPPacket) {
TCPPacket tp=(TCPPacket)pt;
ff=new FileWriter("da.txt",true);
sp=new Integer(tp.src_port).toString();
dp=new Integer(tp.dst_port).toString();
window=new Integer(tp.window).toString();
sequence=new Long(tp.sequence).toString();
acknowledge=new Long(tp.ack_num).toString();
byte[]dat=tp.data;
da=new String(dat);
ff.write("\r\n Source port is :-"+sp);
ff.write("\r\n Desination port is:-"+dp);
ff.write("\r\n Sequence no is:-"+sequence);
ff.write("\r\n Acknowledgement no is:-"+acknowledge);
ff.write("\r\n Status of rsv1 flag is:-"+tp.rsv1);
ff.write("\r\n Status of rsv2 flag is:-"+tp.rsv2);
ff.write("\r\n Status of Syn flag is:-"+tp.syn);
ff.write("\r\n Status of Urg flag is:-"+tp.urg);
ff.write("\r\n Status of Fin flag is:-"+tp.fin);
ff.write("\r\n Data :-"+da);
ff.write("\r\n");
ff.write("\r\n");
ff.close();
}
} catch(Exception e) {
System.out.println(e.getMessage());
}
}
public static void main(String args[])throws IOException {
int i;
try {
NetworkInterface[] devices = JpcapCaptor.getDeviceList();
//for each network interface
for (i = 0; i < devices.length; i++) {
//print out its name and description
System.out.println(i+": "+devices[i].name + "(" +
devices[i].description+")"+devices[i].loopback);
//print out its datalink name and description
System.out.println(" datalink: "+devices[i].datalink_name + "("
+ devices[i].datalink_description+")");
//print out its MAC address
System.out.print(" MAC address:");
for (byte b : devices[i].mac_address)
System.out.print(Integer.toHexString(b&0xff) + ":");
System.out.println();
//print out its IP address, subnet mask and broadcast address
for (NetworkInterfaceAddress a : devices[i].addresses)
System.out.println(" address:"+a.address + " " + a.subnet + " "+
a.broadcast);
}
JpcapCaptor captor=JpcapCaptor.openDevice(devices[0], 65535, true, 20);
captor.loopPacket(-1,new Network());
captor.close();
}
catch(Exception e) {
System.out.println(e.getMessage());
}
}
}
在计算机中安装jpcap,然后尝试运行代码。
您可以从这里下载jpcap.exe文件在完整编译和链接jpcap(在Mac OS X计算机上使用eclipse)之后,我遇到了相同的问题。原来有两个版本的Jpcap:(没有JpCaptor),还有一个版本有JpCaptor:。也许这有帮助 一定是因为代码的缩进不太好。请对代码块使用一致的逻辑缩进。代码的缩进是为了帮助人们理解程序流程。另外,尝试捕捉更具体的异常,不要捕捉
(异常e)
,我不想数数第63行是哪一行。也许你可以帮助拉姆·夏尔玛?@FrancisP奇怪的是,根据TextPad的说法,第63行是//打印出它的数据链名称和描述。如图所示,Francis P第63行是“NetworkInterface[]devices=JpcapCaptor.getDeviceList();”虽然此链接可以回答问题,但最好在此处包含答案的基本部分,并提供链接供参考。如果链接页面发生更改,仅链接的答案可能无效。-@Zizouz212-这不是一个链接唯一的答案。它为这个问题提供了一个解释,并以链接作为支持证据。
import jpcap.*;
import jpcap.packet.*;
import java.io.*;
import jpcap.packet.TCPPacket.*;
import java.io.*;
import jpcap.JpcapCaptor.*;
class Network implements PacketReceiver {
System.out.println(System.getProperty("java.library.path"));
String sp=null;
String dp=null;
String window=null;
String sequence=null;
String acknowledge=null;
FileWriter ff=null;
String da=null;
public void receivePacket(Packet pt) {
try {
if(pt instanceof TCPPacket) {
TCPPacket tp=(TCPPacket)pt;
ff=new FileWriter("da.txt",true);
sp=new Integer(tp.src_port).toString();
dp=new Integer(tp.dst_port).toString();
window=new Integer(tp.window).toString();
sequence=new Long(tp.sequence).toString();
acknowledge=new Long(tp.ack_num).toString();
byte[]dat=tp.data;
da=new String(dat);
ff.write("\r\n Source port is :-"+sp);
ff.write("\r\n Desination port is:-"+dp);
ff.write("\r\n Sequence no is:-"+sequence);
ff.write("\r\n Acknowledgement no is:-"+acknowledge);
ff.write("\r\n Status of rsv1 flag is:-"+tp.rsv1);
ff.write("\r\n Status of rsv2 flag is:-"+tp.rsv2);
ff.write("\r\n Status of Syn flag is:-"+tp.syn);
ff.write("\r\n Status of Urg flag is:-"+tp.urg);
ff.write("\r\n Status of Fin flag is:-"+tp.fin);
ff.write("\r\n Data :-"+da);
ff.write("\r\n");
ff.write("\r\n");
ff.close();
}
} catch(Exception e) {
System.out.println(e.getMessage());
}
}
public static void main(String args[])throws IOException {
int i;
try {
NetworkInterface[] devices = JpcapCaptor.getDeviceList();
//for each network interface
for (i = 0; i < devices.length; i++) {
//print out its name and description
System.out.println(i+": "+devices[i].name + "(" +
devices[i].description+")"+devices[i].loopback);
//print out its datalink name and description
System.out.println(" datalink: "+devices[i].datalink_name + "("
+ devices[i].datalink_description+")");
//print out its MAC address
System.out.print(" MAC address:");
for (byte b : devices[i].mac_address)
System.out.print(Integer.toHexString(b&0xff) + ":");
System.out.println();
//print out its IP address, subnet mask and broadcast address
for (NetworkInterfaceAddress a : devices[i].addresses)
System.out.println(" address:"+a.address + " " + a.subnet + " "+
a.broadcast);
}
JpcapCaptor captor=JpcapCaptor.openDevice(devices[0], 65535, true, 20);
captor.loopPacket(-1,new Network());
captor.close();
}
catch(Exception e) {
System.out.println(e.getMessage());
}
}
}
static{
System.loadLibrary("JpcapCaptor.dll");
}