Java 文件和字节数组互转

工具类如下

 

import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
 
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
 
public class FileUtil {
 
    private static Logger logger = LoggerFactory.getLogger(FileUtil.class);
 
    //byte to file
    public static void byte2File(byte[] bfile, String filePath, String fileName) {
        BufferedOutputStream bos = null;
        FileOutputStream fos = null;
        File file = null;
        try {
            File dir = new File(filePath);
            if (!dir.exists()) {// 判断文件目录是否存在
                dir.mkdirs();
            }
            file = new File(filePath + fileName);
            fos = new FileOutputStream(file);
            bos = new BufferedOutputStream(fos);
            bos.write(bfile);
        } catch (Exception e) {
            logger.error(e.getMessage(), e);
        } finally {
            if (bos != null) {
                try {
                    bos.close();
                } catch (IOException e1) {
                    logger.error(e1.getMessage(), e1);
 
                }
            }
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException e1) {
                    logger.error(e1.getMessage(), e1);
                }
            }
        }
    }
 
    //file to byte
    public static byte[] file2Byte(File filePath) {
        byte[] buffer = null;
 
        try {
            FileInputStream fis = new FileInputStream(filePath);
 
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            byte[] b = new byte[1024];
            int n;
            while ((n = fis.read(b)) != -1) {
                bos.write(b, 0, n);
            }
            fis.close();
            bos.close();
            buffer = bos.toByteArray();
        } catch (IOException e) {
            logger.error("error message {}", e.getMessage());
        }
        return buffer;
    }
}