資源簡介
用java實現的網際校驗和算法，詳情請查閱博主關于網際校驗和算法的博客：https://blog.csdn.net/qq_41664447/article/details/103450083
代碼片段和文件信息
package?internet;
public?class?CheckData?{
public?static?void?check（String[]?strings?int?type）?{
switch?（type）?{
case?1:ICMPData（strings）;break;
case?6:TCPData（strings）;break;
default:?System.out.println（“數據類型不符合要求“）;break;
}
}
private?static?void?ICMPData（String[]?strings）?{
//確定ICMP開始部分
int?IpLenOfHead?=?transformToTen（strings[14]?2）;
System.out.println（“IpLen:?“?+?IpLenOfHead）;
}
private?static?void?TCPData（String[]?strings）?{
//確定ICMP開始部分
int?IpLenOfHead?=?transformToTen（strings[14]?1）?*?4;
System.out.println（“IP數據報首部長度:?“?+?IpLenOfHead?+?“Bytes“）;
int?TCPLenOfHead?=?transformToTen（strings[14?+?IpLenOfHead?+?12]?2）?*?4;
System.out.println（“TCP首部長度:?“?+?TCPLenOfHead?+?“Bytes“）;
int?TCPLenOfBody?=?strings.length?-?IpLenOfHead?-?TCPLenOfHead?-?14;
System.out.println（“TCP數據部分長度:“?+?TCPLenOfBody）;
//校驗
/*
?*?（1）十二字節偽首部
?*?（2）TCP首部
?*?（3）TCP數據部分
?*/
String?dummyHead?=?““;
for（int?i?=?26;?i? dummyHead?+=?strings[i]?+?“?“;
}
dummyHead?+=?“00“?+?“?“;
dummyHead?+=?“06“?+?“?“;
dummyHead?+=?“00“?+?“?“;
int?temp?=?TCPLenOfBody?+?TCPLenOfHead;
dummyHead?+=?temp?+?“?“;
//追加TCP首部和數據部分到dummyHead
for（int?i?=?14?+?IpLenOfHead;?i? dummyHead?+=?strings[i]?+?“?“;
}
//運算檢驗
boolean?b?=?verify（dummyHead）;
}
private?static?boolean?verify（String?s）?{
System.out.println（“\n校驗和序列：“）;
String?[]strings?=?s.split（“?“）;
for（int?i?=?0;?i? if（i?%?2?==?0?&&?i?!=?0）?{
System.out.println（）;
}
System.out.print（strings[i]?+?“?“）;
}
//提取最后一列
int?sum1?=?0;//最右邊
int?sum2?=?0;
int?sum3?=?0;
int?sum4?=?0;
for（int?i?=?0;?i? if（i?%?2?!=?0）?{
sum1?+=?transformToTen（strings[i]?1）;
sum2?+=?transformToTen（strings[i]?2）;
}?else?{
sum3?+=?transformToTen（strings[i]?1）;
sum4?+=?transformToTen（strings[i]?2）;
}
}
System.out.println（）;
System.out.println（sum4?+?“?“?+?sum3?+?“?“?+?sum2?+?“?“?+?sum1）;
//轉換為16進制的高低位
int?high1?=?sum1?/?16;
int?low1?=?sum1?%?16;
sum2?+=?high1;
int?high2?=?sum2?/?16;
int?low2?=?sum2?%?16;
sum3?+=?high2;
int?high3?=?sum3?/?16;
int?low3?=?sum3?%?16;
sum4?+=?high3;
int?high4?=?sum4?/?16;
int?low4?=?sum4?%?16;
low1?+=?high4;
low2?+=?low1?/?16;
low1?=?low1?%?16;
low3?+=?low2?/?16;
low2?=?low2?%?16;
low4?+=?low3?/?16;
low3?=?low3?%?16;
//low4不會再大于等于16的
System.out.println（high4?+?“?“?+?high3?+?“?“?+?high2?+?“?“?+?high1）;
System.out.println（“answer:??“?+?low4?+?“?“?+?low3?+?“?“?+?low2?+?“?“?+?low1）;
return?true;
}
//轉換十六進制為十進制
private?static?int?transformToTen（String?string?int?type）?{
char[]?count?=?string.toCharArray（）;
int?low?=?count[1]?-?48;
if（low?>?9）?{
low?=?count[1]?-?87;
}
int?high?=?count[0]?-?48;
if（high?>?9）?{
high?=?cou?屬性????????????大小?????日期????時間???名稱
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............此處省略136個文件信息
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