MD5Util.java
2.93 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
package com.phxl.common.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* 提供一系列获取和校验MD5的方法
*
*/
public class MD5Util {
/**
* 获取该输入流的MD5值
*
* @param is
* @return
* @throws NoSuchAlgorithmException
* @throws IOException
*/
public static String getMD5(InputStream is) throws NoSuchAlgorithmException, IOException {
StringBuffer md5 = new StringBuffer();
MessageDigest md = MessageDigest.getInstance("MD5");
byte[] dataBytes = new byte[1024];
int nread = 0;
while ((nread = is.read(dataBytes)) != -1) {
md.update(dataBytes, 0, nread);
};
byte[] mdbytes = md.digest();
// convert the byte to hex format
for (int i = 0; i < mdbytes.length; i++) {
md5.append(Integer.toString((mdbytes[i] & 0xff) + 0x100, 16).substring(1));
}
return md5.toString();
}
/**
* 获取该文件的MD5值
*
* @param file
* @return
* @throws NoSuchAlgorithmException
* @throws IOException
*/
public static String getMD5(File file) throws NoSuchAlgorithmException, IOException {
FileInputStream fis = new FileInputStream(file);
return getMD5(fis);
}
/**
* 获取指定路径文件的MD5值
*
* @param path
* @return
* @throws NoSuchAlgorithmException
* @throws IOException
*/
public static String getMD5(String path) throws NoSuchAlgorithmException, IOException {
FileInputStream fis = new FileInputStream(path);
return getMD5(fis);
}
/**
* 校验该输入流的MD5值
*
* @param is
* @param toBeCheckSum
* @return
* @throws NoSuchAlgorithmException
* @throws IOException
*/
public static boolean md5CheckSum(InputStream is, String toBeCheckSum) throws NoSuchAlgorithmException, IOException {
return getMD5(is).equals(toBeCheckSum);
}
/**
* 校验该文件的MD5值
*
* @param file
* @param toBeCheckSum
* @return
* @throws NoSuchAlgorithmException
* @throws IOException
*/
public static boolean md5CheckSum(File file, String toBeCheckSum) throws NoSuchAlgorithmException, IOException {
return getMD5(file).equals(toBeCheckSum);
}
/**
* 校验指定路径文件的MD5值
*
* @param path
* @param toBeCheckSum
* @return
* @throws NoSuchAlgorithmException
* @throws IOException
*/
public static boolean md5CheckSum(String path, String toBeCheckSum) throws NoSuchAlgorithmException, IOException {
return getMD5(path).equals(toBeCheckSum);
}
/* MD5 TEST
public static void main(String[] args) {
try {
System.out.println(getMD5("D:/work/BJ/ESB_CSS_CSS_ImportCustCompFormRejectInfoSrv.xml"));
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
*/
}