Java SHA-1的读写问题
我正在尝试用java生成文件内容的SHA-1,然后将其读回。一个十六进制数字变了,我不知道为什么 代码: 在文件中写入Java SHA-1的读写问题,java,Java,我正在尝试用java生成文件内容的SHA-1,然后将其读回。一个十六进制数字变了,我不知道为什么 代码: 在文件中写入 //writer: import java.util.*; import java.io.*; import java.security.*; public class Writer{ public static void main(String []args)throws Exception{ InputStream is = new Fil
//writer:
import java.util.*;
import java.io.*;
import java.security.*;
public class Writer{
public static void main(String []args)throws Exception{
InputStream is = new FileInputStream("input.txt");
PrintStream os=new PrintStream(new File("out.txt"));
byte[] buffer = new byte[1024];
String str;
MessageDigest complete = MessageDigest.getInstance("SHA-1");
MessageDigest partial = MessageDigest.getInstance("SHA-1");
int numRead;
do {
numRead = is.read(buffer);
if (numRead > 0) {
complete.update(buffer, 0, numRead);
partial.update(buffer,0,numRead);
byte []digest=partial.digest();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < digest.length; i++) {
sb.append(String.format("%x", digest[i]));
}
System.out.println(sb.toString());
str=new String(digest);
os.println(str);
partial.reset();
}
} while (numRead != -1);
byte []digest=complete.digest();
StringBuilder sb = new StringBuilder();
for (int i = 0; i < digest.length; i++) {
sb.append(String.format("%x", digest[i]));
}
System.out.println(sb.toString());
str=new String(digest);
os.println(str);
is.close();
os.close();
}
}
out.txt:
ñUk%¦QÃÜH1‡³üâÒ9ÇðÔ
NÕÇAÛ÷€Yþós3@ïÏ›´YO
â¶a'æòVHéâÒ±Ž&Ô¥
&£[òÌ®(^;˜µ #†Ãh
çÑRÍ?_"”š»Á°IEQð{
读者输出
f1556b25a651c3dc4831871ab3fce2d239c7f0d4
4ed5c741dbf78059fef3733340efcf9b16b4594f
e2b66127e6f25648e9e2d21cb18e26d4a541a17
26c213a35b3f2ccae28ad5e3b98b5a02386c368
e7d152cd3f5f22949abbc11eb049451c511df07b
你试过使用调试器吗?对于任何程序员来说,这都是一个必不可少的工具。它还将帮助您更好地理解问题,以便您可以编写一个小程序来重新创建问题。您的问题并不清楚。提供程序输出,可能会有意义。添加了示例输入输出。请退房。
f1556b25a651c3dc4831871ab3fce2d239c7f0d4
4ed5c741dbf78059fef3733340efcf9b16b4594f
e2b66127e6f25648e9e2d21cb18e26d4a541a17
26c213a35b3f2ccae28ad5e3b98b5a02386c368
e7d152cd8f5f22949abbc11eb049451c511df07b
ñUk%¦QÃÜH1‡³üâÒ9ÇðÔ
NÕÇAÛ÷€Yþós3@ïÏ›´YO
â¶a'æòVHéâÒ±Ž&Ô¥
&£[òÌ®(^;˜µ #†Ãh
çÑRÍ?_"”š»Á°IEQð{
f1556b25a651c3dc4831871ab3fce2d239c7f0d4
4ed5c741dbf78059fef3733340efcf9b16b4594f
e2b66127e6f25648e9e2d21cb18e26d4a541a17
26c213a35b3f2ccae28ad5e3b98b5a02386c368
e7d152cd3f5f22949abbc11eb049451c511df07b