Java计算文件MD5值(支持大文件)

    
    
package com.hthl.xxtd;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.MessageDigest;

import org.apache.commons.codec.binary.Hex;
import org.apache.commons.codec.digest.DigestUtils;

/**
*MD5计算工具 xuxile 2017-09-13
*/
public class Md5CaculateUtil {

/**
* 获取一个文件的md5值(可处理大文件)
* @return md5 value
*/
public static String getMD5(File file) {
FileInputStream fileInputStream = null;
try {
MessageDigest MD5 = MessageDigest.getInstance( “MD5”);
fileInputStream = new FileInputStream(file);
byte[] buffer = new byte[ 8192];
int length;
while ((length = fileInputStream.read(buffer)) != - 1) {
MD5.update(buffer, 0, length);
}
return new String(Hex.encodeHex(MD5.digest()));
} catch (Exception e) {
e.printStackTrace();
return null;
} finally {
try {
if (fileInputStream != null){
fileInputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}

/**
* 求一个字符串的md5值
* @param target 字符串
* @return md5 value
*/
public static String MD5(String target) {
return DigestUtils.md5Hex(target);
}

public static void main(String[] args) {
long beginTime = System.currentTimeMillis();
File file = new File( “D:/1/pdi-ce-7.0.0.0-24.zip”);
String md5 = getMD5(file);
long endTime = System.currentTimeMillis();
System.out.println( “MD5:” + md5 + “\n 耗时:” + ((endTime - beginTime) / 1000) + “s”);
}
}
    
    

转自：https://blog.csdn.net/xuxile/article/details/77963894

  
  
package com.hthl.xxtd;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.MessageDigest;

import org.apache.commons.codec.binary.Hex;
import org.apache.commons.codec.digest.DigestUtils;

/**
*MD5计算工具 xuxile 2017-09-13
*/
public class Md5CaculateUtil {

/**
* 获取一个文件的md5值(可处理大文件)
* @return md5 value
*/
public static String getMD5(File file) {
FileInputStream fileInputStream = null;
try {
MessageDigest MD5 = MessageDigest.getInstance( “MD5”);
fileInputStream = new FileInputStream(file);
byte[] buffer = new byte[ 8192];
int length;
while ((length = fileInputStream.read(buffer)) != - 1) {
MD5.update(buffer, 0, length);
}
return new String(Hex.encodeHex(MD5.digest()));
} catch (Exception e) {
e.printStackTrace();
return null;
} finally {
try {
if (fileInputStream != null){
fileInputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}

/**
* 求一个字符串的md5值
* @param target 字符串
* @return md5 value
*/
public static String MD5(String target) {
return DigestUtils.md5Hex(target);
}

public static void main(String[] args) {
long beginTime = System.currentTimeMillis();
File file = new File( “D:/1/pdi-ce-7.0.0.0-24.zip”);
String md5 = getMD5(file);
long endTime = System.currentTimeMillis();
System.out.println( “MD5:” + md5 + “\n 耗时:” + ((endTime - beginTime) / 1000) + “s”);
}
}
  
  

转自：https://blog.csdn.net/xuxile/article/details/77963894