Md5Util.java
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package com.huaheng.pc.manager.apkinfo.domain;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.MessageDigest;
/**
* @author
*/
public class Md5Util {
/**
* // 计算文件的 MD5 值
* @param file
* @return
*/
public static String md5(File file) {
if (file == null || !file.isFile() || !file.exists()) {
return "";
}
FileInputStream in = null;
String result = "";
byte[] buffer = new byte[8192];
int len;
try {
MessageDigest md5 = MessageDigest.getInstance("MD5");
in = new FileInputStream(file);
while ((len = in.read(buffer)) != -1) {
md5.update(buffer, 0, len);
}
byte[] bytes = md5.digest();
for (byte b : bytes) {
String temp = Integer.toHexString(b & 0xff);
if (temp.length() == 1) {
temp = "0" + temp;
}
result += temp;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if(null!=in){
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return result;
}
}