怎样用java编写网络连接检测程序?? 怎样用java编写网络连接检测程序??谢谢 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 是ping吗?这里有个C++的,可以参考一下,差不多:#include "winsock2.h"#include "stdlib.h"#include "stdio.h"#define ICMP_ECHO 8 #define ICMP_ECHOREPLY 0 #define ICMP_MIN 8 // minimum 8 byte icmp packet (just header) /* The IP header */ typedef struct iphdr { unsigned int h_len:4; // length of the header unsigned int version:4; // Version of IP unsigned char tos; // Type of service unsigned short total_len; // total length of the packet unsigned short ident; // unique identifier unsigned short frag_and_flags; // flags unsigned char ttl; unsigned char proto; // protocol (TCP, UDP etc) unsigned short checksum; // IP checksum unsigned int sourceIP; unsigned int destIP; }IpHeader; // // ICMP header // typedef struct icmphdr { BYTE i_type; BYTE i_code; /* type sub code */ USHORT i_cksum; USHORT i_id; USHORT i_seq; /* This is not the std header, but we reserve space for time */ ULONG timestamp; }IcmpHeader; #define STATUS_FAILED 0xFFFF #define DEF_PACKET_SIZE 32#define DEF_PACKET_NUMBER 4 /* 发送数据报的个数 */#define MAX_PACKET 1024 #define xmalloc(s) HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,(s)) #define xfree(p) HeapFree (GetProcessHeap(),0,(p)) void fill_icmp_data(char *, int); USHORT checksum(USHORT *, int); int decode_resp(char *,int ,struct sockaddr_in *); void Usage(char *progname){ fprintf(stderr,"Usage:\n"); fprintf(stderr,"%s [number of packets] [data_size]\n",progname); fprintf(stderr,"datasize can be up to 1Kb\n"); ExitProcess(STATUS_FAILED); } int main(int argc, char **argv){ WSADATA wsaData; SOCKET sockRaw; struct sockaddr_in dest,from; struct hostent * hp; int bread,datasize,times; int fromlen = sizeof(from); int timeout = 1000;int statistic = 0; /* 用于统计结果 */ char *dest_ip; char *icmp_data; char *recvbuf; unsigned int addr=0; USHORT seq_no = 0; if (WSAStartup(MAKEWORD(2,1),&wsaData) != 0){ fprintf(stderr,"WSAStartup failed: %d\n",GetLastError()); ExitProcess(STATUS_FAILED); } if (argc <2 ) { Usage(argv[0]); } sockRaw = WSASocket(AF_INET,SOCK_RAW,IPPROTO_ICMP,NULL, 0,WSA_FLAG_OVERLAPPED);////注:为了使用发送接收超时设置(即设置SO_RCVTIMEO, SO_SNDTIMEO),// 必须将标志位设为WSA_FLAG_OVERLAPPED !// if (sockRaw == INVALID_SOCKET) { fprintf(stderr,"WSASocket() failed: %d\n",WSAGetLastError()); ExitProcess(STATUS_FAILED); } bread = setsockopt(sockRaw,SOL_SOCKET,SO_RCVTIMEO,(char*)&timeout, sizeof(timeout)); if(bread == SOCKET_ERROR) { fprintf(stderr,"failed to set recv timeout: %d\n",WSAGetLastError()); ExitProcess(STATUS_FAILED); } timeout = 1000; bread = setsockopt(sockRaw,SOL_SOCKET,SO_SNDTIMEO,(char*)&timeout, sizeof(timeout)); if(bread == SOCKET_ERROR) { fprintf(stderr,"failed to set send timeout: %d\n",WSAGetLastError()); ExitProcess(STATUS_FAILED); } memset(&dest,0,sizeof(dest)); hp = gethostbyname(argv[1]); if (!hp){ addr = inet_addr(argv[1]); } if ((!hp) && (addr == INADDR_NONE) ) { fprintf(stderr,"Unable to resolve %s\n",argv[1]); ExitProcess(STATUS_FAILED); } if (hp != NULL) memcpy(&(dest.sin_addr),hp->h_addr,hp->h_length); else dest.sin_addr.s_addr = addr; if (hp) dest.sin_family = hp->h_addrtype; else dest.sin_family = AF_INET; dest_ip = inet_ntoa(dest.sin_addr); // // atoi函数原型是: int atoi( const char *string );// The return value is 0 if the input cannot be converted to an integer !//if(argc>2){times=atoi(argv[2]);if(times == 0)times=DEF_PACKET_NUMBER;}elsetimes=DEF_PACKET_NUMBER;if (argc >3) { datasize = atoi(argv[3]); if (datasize == 0) datasize = DEF_PACKET_SIZE;if (datasize >1024) /* 用户给出的数据包大小太大 */{fprintf(stderr,"WARNING : data_size is too large !\n");datasize = DEF_PACKET_SIZE; }} else datasize = DEF_PACKET_SIZE; datasize += sizeof(IcmpHeader); icmp_data = (char*)xmalloc(MAX_PACKET); recvbuf = (char*)xmalloc(MAX_PACKET); if (!icmp_data) { fprintf(stderr,"HeapAlloc failed %d\n",GetLastError()); ExitProcess(STATUS_FAILED); } memset(icmp_data,0,MAX_PACKET); fill_icmp_data(icmp_data,datasize); ////显示提示信息//fprintf(stdout,"\nPinging %s ....\n\n",dest_ip);for(int i=0;i{ int bwrote; ((IcmpHeader*)icmp_data)->i_cksum = 0; ((IcmpHeader*)icmp_data)->timestamp = GetTickCount(); ((IcmpHeader*)icmp_data)->i_seq = seq_no++; ((IcmpHeader*)icmp_data)->i_cksum = checksum((USHORT*)icmp_data,datasize);bwrote = sendto(sockRaw,icmp_data,datasize,0,(struct sockaddr*)&dest,sizeof(dest)); if (bwrote == SOCKET_ERROR){ if (WSAGetLastError() == WSAETIMEDOUT) { printf("Request timed out.\n"); continue; } fprintf(stderr,"sendto failed: %d\n",WSAGetLastError()); ExitProcess(STATUS_FAILED); } if (bwrote < datasize ) { fprintf(stdout,"Wrote %d bytes\n",bwrote); } bread = recvfrom(sockRaw,recvbuf,MAX_PACKET,0,(struct sockaddr*)&from,&fromlen); if (bread == SOCKET_ERROR){ if (WSAGetLastError() == WSAETIMEDOUT) { printf("Request timed out.\n"); continue; } fprintf(stderr,"recvfrom failed: %d\n",WSAGetLastError()); ExitProcess(STATUS_FAILED); } if(!decode_resp(recvbuf,bread,&from))statistic++; /* 成功接收的数目++ */Sleep(1000); }/*Display the statistic result*/fprintf(stdout,"\nPing statistics for %s \n",dest_ip);fprintf(stdout," Packets: Sent = %d,Received = %d, Lost = %d (%2.0f%% loss)\n",times,statistic,(times-statistic),(float)(times-statistic)/times*100);WSACleanup();return 0; } /* The response is an IP packet. We must decode the IP header to locate the ICMP data */ int decode_resp(char *buf, int bytes,struct sockaddr_in *from) { IpHeader *iphdr; IcmpHeader *icmphdr; unsigned short iphdrlen; iphdr = (IpHeader *)buf; iphdrlen = (iphdr->h_len) * 4 ; // number of 32-bit words *4 = bytes if (bytes < iphdrlen + ICMP_MIN) { printf("Too few bytes from %s\n",inet_ntoa(from->sin_addr)); } icmphdr = (IcmpHeader*)(buf + iphdrlen); if (icmphdr->i_type != ICMP_ECHOREPLY) { fprintf(stderr,"non-echo type %d recvd\n",icmphdr->i_type); return 1; } if (icmphdr->i_id != (USHORT)GetCurrentProcessId()) { fprintf(stderr,"someone else''s packet!\n"); return 1; } printf("%d bytes from %s:",bytes, inet_ntoa(from->sin_addr)); printf(" icmp_seq = %d. ",icmphdr->i_seq); printf(" time: %d ms ",GetTickCount()-icmphdr->timestamp); printf("\n");return 0; } USHORT checksum(USHORT *buffer, int size) { unsigned long cksum=0; while(size >1) { cksum+=*buffer++; size -=sizeof(USHORT); } if(size) { cksum += *(UCHAR*)buffer; } cksum = (cksum >> 16) + (cksum & 0xffff); cksum += (cksum >>16); return (USHORT)(~cksum); } /* Helper function to fill in various stuff in our ICMP request. */ void fill_icmp_data(char * icmp_data, int datasize){ IcmpHeader *icmp_hdr; char *datapart; icmp_hdr = (IcmpHeader*)icmp_data; icmp_hdr->i_type = ICMP_ECHO; icmp_hdr->i_code = 0; icmp_hdr->i_id = (USHORT)GetCurrentProcessId(); icmp_hdr->i_cksum = 0; icmp_hdr->i_seq = 0; datapart = icmp_data + sizeof(IcmpHeader); // // Place some junk in the buffer. // memset(datapart,''E'', datasize - sizeof(IcmpHeader)); } /******************* 附: ping命令执行时显示的画面 ****************\* C:\Documents and settings\houzhijiang>ping 236.56.54.12 * * ** Pinging 236.56.54.12 with 32 bytes of data: ** * * Request timed out. ** Request timed out. ** Request timed out. ** Request timed out. * * ** Ping statistics for 236.56.54.12: ** Packets: Sent = 4, Received = 0, Lost = 4 (100% loss), ** *\**************************************************************//**************************************************************\* C:\Documents and Settings\houzhijiang>ping 127.0.0.1 ** ** Pinging 127.0.0.1 with 32 bytes of data: ** ** Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 ** Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 ** Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 ** Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 ** ** Ping statistics for 127.0.0.1: ** Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), ** Approximate round trip times in milli-seconds: ** Minimum = 0ms, Maximum = 0ms, Average = 0ms ** *\**************************************************************/ //试试这个String ip = "192.168.1.14";//目标ipSocket my = new Socket(); //实例化socket对象try{ InetSocketAddress mySock = new InetSocketAddress(InetAddress.getByName(ip), 80);//假设连接目标的80端口 my.connect(mySock,100);//100毫秒超时 System.out.println("连接成功!");}catch(SocketTimeoutException e) {//捉到了! System.out.println("cannot connect ...");}catch(Exception e) {//其他有IOException等 //other Exception do...} Oracle中java存储过程java.security.AccessControlException 每个线程都可以或不可以标记为一个守护程序 那个高手前辈帮我看看~急!!!!!在线等! 用SWT做界面锁定的问题 怎样才能显示出来啊? 列车售票系统,打印车票应该用什么技术好呢? netbeans 生成主项目失败 -- 谁能帮我解析一下 请求高手帮忙 21天学通java的课后习题在那个网站 在java 程序里如何調用oracle 里寫的一些函數和包? 问两个JAVA入门级的问题 新人问题
#include "winsock2.h"
#include "stdlib.h"
#include "stdio.h"
#define ICMP_ECHO 8
#define ICMP_ECHOREPLY 0
#define ICMP_MIN 8 // minimum 8 byte icmp packet (just header)
/* The IP header */
typedef struct iphdr {
unsigned int h_len:4; // length of the header
unsigned int version:4; // Version of IP
unsigned char tos; // Type of service
unsigned short total_len; // total length of the packet
unsigned short ident; // unique identifier
unsigned short frag_and_flags; // flags
unsigned char ttl;
unsigned char proto; // protocol (TCP, UDP etc)
unsigned short checksum; // IP checksum
unsigned int sourceIP;
unsigned int destIP;
}IpHeader;
//
// ICMP header
//
typedef struct icmphdr {
BYTE i_type;
BYTE i_code; /* type sub code */
USHORT i_cksum;
USHORT i_id;
USHORT i_seq;
/* This is not the std header, but we reserve space for time */
ULONG timestamp;
}IcmpHeader;
#define STATUS_FAILED 0xFFFF
#define DEF_PACKET_SIZE 32
#define DEF_PACKET_NUMBER 4 /* 发送数据报的个数 */
#define MAX_PACKET 1024
#define xmalloc(s) HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,(s))
#define xfree(p) HeapFree (GetProcessHeap(),0,(p))
void fill_icmp_data(char *, int);
USHORT checksum(USHORT *, int);
int decode_resp(char *,int ,struct sockaddr_in *);
void Usage(char *progname){
fprintf(stderr,"Usage:\n");
fprintf(stderr,"%s [number of packets] [data_size]\n",progname);
fprintf(stderr,"datasize can be up to 1Kb\n");
ExitProcess(STATUS_FAILED);
}
int main(int argc, char **argv){
WSADATA wsaData;
SOCKET sockRaw;
struct sockaddr_in dest,from;
struct hostent * hp;
int bread,datasize,times;
int fromlen = sizeof(from);
int timeout = 1000;
int statistic = 0; /* 用于统计结果 */
char *dest_ip;
char *icmp_data;
char *recvbuf;
unsigned int addr=0;
USHORT seq_no = 0;
if (WSAStartup(MAKEWORD(2,1),&wsaData) != 0){
fprintf(stderr,"WSAStartup failed: %d\n",GetLastError());
ExitProcess(STATUS_FAILED);
}
if (argc <2 ) {
Usage(argv[0]);
}
sockRaw = WSASocket(AF_INET,SOCK_RAW,IPPROTO_ICMP,NULL, 0,WSA_FLAG_OVERLAPPED);
//
//注:为了使用发送接收超时设置(即设置SO_RCVTIMEO, SO_SNDTIMEO),
// 必须将标志位设为WSA_FLAG_OVERLAPPED !
//
if (sockRaw == INVALID_SOCKET) {
fprintf(stderr,"WSASocket() failed: %d\n",WSAGetLastError());
ExitProcess(STATUS_FAILED);
}
bread = setsockopt(sockRaw,SOL_SOCKET,SO_RCVTIMEO,(char*)&timeout,
sizeof(timeout));
if(bread == SOCKET_ERROR) {
fprintf(stderr,"failed to set recv timeout: %d\n",WSAGetLastError());
ExitProcess(STATUS_FAILED);
}
timeout = 1000;
bread = setsockopt(sockRaw,SOL_SOCKET,SO_SNDTIMEO,(char*)&timeout,
sizeof(timeout));
if(bread == SOCKET_ERROR) {
fprintf(stderr,"failed to set send timeout: %d\n",WSAGetLastError());
ExitProcess(STATUS_FAILED);
}
memset(&dest,0,sizeof(dest));
hp = gethostbyname(argv[1]);
if (!hp){
addr = inet_addr(argv[1]);
}
if ((!hp) && (addr == INADDR_NONE) ) {
fprintf(stderr,"Unable to resolve %s\n",argv[1]);
ExitProcess(STATUS_FAILED);
}
if (hp != NULL)
memcpy(&(dest.sin_addr),hp->h_addr,hp->h_length);
else
dest.sin_addr.s_addr = addr;
if (hp)
dest.sin_family = hp->h_addrtype;
else
dest.sin_family = AF_INET;
dest_ip = inet_ntoa(dest.sin_addr);
//
// atoi函数原型是: int atoi( const char *string );
// The return value is 0 if the input cannot be converted to an integer !
//
if(argc>2)
{
times=atoi(argv[2]);
if(times == 0)
times=DEF_PACKET_NUMBER;
}
else
times=DEF_PACKET_NUMBER;
if (argc >3)
{
datasize = atoi(argv[3]);
if (datasize == 0)
datasize = DEF_PACKET_SIZE;
if (datasize >1024) /* 用户给出的数据包大小太大 */
{
fprintf(stderr,"WARNING : data_size is too large !\n");
datasize = DEF_PACKET_SIZE;
}
}
else
datasize = DEF_PACKET_SIZE;
datasize += sizeof(IcmpHeader);
icmp_data = (char*)xmalloc(MAX_PACKET);
recvbuf = (char*)xmalloc(MAX_PACKET);
if (!icmp_data) {
fprintf(stderr,"HeapAlloc failed %d\n",GetLastError());
ExitProcess(STATUS_FAILED);
}
fill_icmp_data(icmp_data,datasize);
//
//显示提示信息
//
fprintf(stdout,"\nPinging %s ....\n\n",dest_ip);for(int i=0;i{
int bwrote;
((IcmpHeader*)icmp_data)->i_cksum = 0;
((IcmpHeader*)icmp_data)->timestamp = GetTickCount();
((IcmpHeader*)icmp_data)->i_seq = seq_no++;
((IcmpHeader*)icmp_data)->i_cksum = checksum((USHORT*)icmp_data,datasize);
bwrote = sendto(sockRaw,icmp_data,datasize,0,(struct sockaddr*)&dest,sizeof(dest));
if (bwrote == SOCKET_ERROR){
if (WSAGetLastError() == WSAETIMEDOUT) {
printf("Request timed out.\n");
continue;
}
fprintf(stderr,"sendto failed: %d\n",WSAGetLastError());
ExitProcess(STATUS_FAILED);
}
if (bwrote < datasize ) {
fprintf(stdout,"Wrote %d bytes\n",bwrote);
}
bread = recvfrom(sockRaw,recvbuf,MAX_PACKET,0,(struct sockaddr*)&from,&fromlen);
if (bread == SOCKET_ERROR){
if (WSAGetLastError() == WSAETIMEDOUT) {
printf("Request timed out.\n");
continue;
}
fprintf(stderr,"recvfrom failed: %d\n",WSAGetLastError());
ExitProcess(STATUS_FAILED);
}
if(!decode_resp(recvbuf,bread,&from))
statistic++; /* 成功接收的数目++ */
Sleep(1000);
}/*
Display the statistic result
*/
fprintf(stdout,"\nPing statistics for %s \n",dest_ip);
fprintf(stdout," Packets: Sent = %d,Received = %d, Lost = %d (%2.0f%% loss)\n",times,
statistic,(times-statistic),(float)(times-statistic)/times*100);WSACleanup();
return 0;
}
/*
The response is an IP packet. We must decode the IP header to locate
the ICMP data
*/
int decode_resp(char *buf, int bytes,struct sockaddr_in *from) {
IpHeader *iphdr;
IcmpHeader *icmphdr;
unsigned short iphdrlen;
iphdr = (IpHeader *)buf;
iphdrlen = (iphdr->h_len) * 4 ; // number of 32-bit words *4 = bytes
if (bytes < iphdrlen + ICMP_MIN) {
printf("Too few bytes from %s\n",inet_ntoa(from->sin_addr));
}
icmphdr = (IcmpHeader*)(buf + iphdrlen);
if (icmphdr->i_type != ICMP_ECHOREPLY) {
fprintf(stderr,"non-echo type %d recvd\n",icmphdr->i_type);
return 1;
}
if (icmphdr->i_id != (USHORT)GetCurrentProcessId()) {
fprintf(stderr,"someone else''s packet!\n");
return 1;
}
printf("%d bytes from %s:",bytes, inet_ntoa(from->sin_addr));
printf(" icmp_seq = %d. ",icmphdr->i_seq);
printf(" time: %d ms ",GetTickCount()-icmphdr->timestamp);
printf("\n");
return 0;
} USHORT checksum(USHORT *buffer, int size) {
unsigned long cksum=0;
while(size >1) {
cksum+=*buffer++;
size -=sizeof(USHORT);
}
if(size) {
cksum += *(UCHAR*)buffer;
}
cksum = (cksum >> 16) + (cksum & 0xffff);
cksum += (cksum >>16);
return (USHORT)(~cksum);
}
/*
Helper function to fill in various stuff in our ICMP request.
*/
void fill_icmp_data(char * icmp_data, int datasize){
IcmpHeader *icmp_hdr;
char *datapart;
icmp_hdr = (IcmpHeader*)icmp_data;
icmp_hdr->i_type = ICMP_ECHO;
icmp_hdr->i_code = 0;
icmp_hdr->i_id = (USHORT)GetCurrentProcessId();
icmp_hdr->i_cksum = 0;
icmp_hdr->i_seq = 0;
datapart = icmp_data + sizeof(IcmpHeader);
//
// Place some junk in the buffer.
//
memset(datapart,''E'', datasize - sizeof(IcmpHeader));
}
/******************* 附: ping命令执行时显示的画面 ****************\
* C:\Documents and settings\houzhijiang>ping 236.56.54.12 * * *
* Pinging 236.56.54.12 with 32 bytes of data: *
* *
* Request timed out. *
* Request timed out. *
* Request timed out. *
* Request timed out. *
* *
* Ping statistics for 236.56.54.12: *
* Packets: Sent = 4, Received = 0, Lost = 4 (100% loss), *
* *
\**************************************************************/
/**************************************************************\
* C:\Documents and Settings\houzhijiang>ping 127.0.0.1 *
* *
* Pinging 127.0.0.1 with 32 bytes of data: *
* *
* Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 *
* Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 *
* Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 *
* Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 *
* *
* Ping statistics for 127.0.0.1: *
* Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), *
* Approximate round trip times in milli-seconds: *
* Minimum = 0ms, Maximum = 0ms, Average = 0ms *
* *
\**************************************************************/
String ip = "192.168.1.14";//目标ip
Socket my = new Socket(); //实例化socket对象
try{
InetSocketAddress mySock = new InetSocketAddress(InetAddress.getByName(ip), 80);//假设连接目标的80端口
my.connect(mySock,100);//100毫秒超时
System.out.println("连接成功!");
}catch(SocketTimeoutException e) {//捉到了!
System.out.println("cannot connect ...");
}catch(Exception e) {//其他有IOException等
//other Exception do...
}