Java文件完整性校验SHA256

Java文件完整性校验sha256

• pom依赖

<dependency>
    <groupId>commons-codecgroupId>
    <artifactId>commons-codecartifactId>
    <version>1.12version>
dependency>

• Java代码
  • 测试大概十个G文件处理时间大概需要50秒

import org.apache.commons.codec.digest.DigestUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.xml.crypto.Data;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Date;

/**
 * sha文件完整性校验
 *
 * @author xxx
 */
public class FileCheckSHA {
     

    private static final Logger logger = LoggerFactory.getLogger(FileCheckSHA.class);

    public static void main(String[] args) throws IOException {
     

        long startTime = System.currentTimeMillis();//记录开始时间
		
        File file = new File("C:\\Users\\xxx\\Desktop\\test.zip");
        String fileSHA256 = fileSHA256(file);
        System.out.println(fileSHA256);

        long endTime = System.currentTimeMillis();//记录结束时间
        float excTime = (float) (endTime - startTime) / 1000;
        int minutes = (int) (excTime / 60);
        int second = (int) (excTime % 60);
        logger.info("一共用时" + minutes + "分" + second + "秒 》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》");


        boolean b = checkFileSHA256(file, "8fbc38cfae2f49664d7bd2832d5a8316d59fab684b00781436216acddee50f96");
        System.out.println(b);
    }


    /**
     * 获取文件SHA256
     *
     * @param file
     * @return
     */
    public static String fileSHA256(File file) {
     
        String sha256Hex = null;
        FileInputStream inputStream = null;
        try {
     
            inputStream = new FileInputStream(file);
            sha256Hex = DigestUtils.sha256Hex(inputStream);
            return sha256Hex;
        } catch (IOException e) {
     
            logger.error("文件获取SHA256失败", e);
        } finally {
     
            if (inputStream != null) {
     
                try {
     
                    inputStream.close();
                } catch (IOException e) {
     
                    e.printStackTrace();
                }
            }
        }
        return null;
    }


    /**
     * 检查文件的SHA256 是否正确
     *
     * @param file   文件
     * @param SHA256 SHA256结果值
     * @return
     */
    public static boolean checkFileSHA256(File file, String SHA256) {
     
        String sha256Hex = null;
        FileInputStream inputStream = null;
        try {
     
            inputStream = new FileInputStream(file);
            sha256Hex = DigestUtils.sha256Hex(inputStream);
            if (sha256Hex.equals(SHA256)) {
     
                return true;
            }
        } catch (IOException e) {
     
            logger.error("SHA256检查文件完整性失败", e);
        } finally {
     
            if (inputStream != null) {
     
                try {
     
                    inputStream.close();
                } catch (IOException e) {
     
                    e.printStackTrace();
                }
            }
        }
        return false;
    }
}