java 上传文件大小转换为 GB/MB/KB/B - 胖头陀春天 - 博客园

安宇雨 - 随手采集
2023-07-12 09:26:31
随手采集
0000-未整理-等待研究

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1.工具类

package cn.cmodes.common.utils;
import java.io.File;
import java.io.FileInputStream;
import java.text.DecimalFormat; public class FileSizeUtil { private static final String TAG=FileSizeUtil.class.getSimpleName(); public static final int SIZETYPE_B = 1;//获取文件大小单位为B的double值

public static final int SIZETYPE_KB = 2;//获取文件大小单位为KB的double值
public static final int SIZETYPE_MB = 3;//获取文件大小单位为MB的double值
public static final int SIZETYPE_GB = 4;//获取文件大小单位为GB的double值

/*\*
 \* 获取文件指定文件的指定单位的大小
 \*
 \* @param filePath 文件路径
 \* @param sizeType 获取大小的类型1为B、2为KB、3为MB、4为GB
 \* @return double值的大小 */
public static double getFileOrFilesSize(String filePath, int sizeType) {
    File file = new File(filePath); long blockSize = 0; try { if (file.isDirectory()) {
            blockSize = getFileSizes(file);
        } else {
            blockSize = getFileSize(file);
        }
    } catch (Exception e) {
        e.printStackTrace();
    } return FormetFileSize(blockSize, sizeType);
} /*\*
 \* 调用此方法自动计算指定文件或指定文件夹的大小
 \*
 \* @param filePath 文件路径
 \* @return 计算好的带B、KB、MB、GB的字符串 */
public static String getAutoFileOrFilesSize(String filePath) {
    File file = new File(filePath); long blockSize = 0; try { if (file.isDirectory()) {
            blockSize = getFileSizes(file);
        } else {
            blockSize = getFileSize(file);
        }
    } catch (Exception e) {
        e.printStackTrace();
    } return formatFileSize(blockSize);
} /*\*
 \* 获取指定文件大小 */
private static long getFileSize(File file) throws Exception { long size = 0; if (file.exists()) {
        FileInputStream fis = null;
        fis = new FileInputStream(file);
        size = fis.available();
    } else {
        file.createNewFile();
    } return size;
} /*\*
 \* 获取指定文件夹 */
private static long getFileSizes(File f) throws Exception { long size = 0;
    File flist\[\] = f.listFiles();
    assert flist != null; for (File file : flist) { if (file.isDirectory()) {
            size = size + getFileSizes(file);
        } else {
            size = size + getFileSize(file);
        }
    } return size;
} **/*\*
 \* 转换文件大小 */

public static String formatFileSize(long fileS) {

    DecimalFormat df = new DecimalFormat("#.00");
    String fileSizeString = "";
    String wrongSize = "0B"; if (fileS == 0) { return wrongSize;
    } if (fileS < 1024) {
        fileSizeString = df.format((double) fileS) + "B";
    } else if (fileS < 1048576) {
        fileSizeString = df.format((double) fileS / 1024) \+ "KB";
    } else if (fileS < 1073741824) {
        fileSizeString = df.format((double) fileS / 1048576) \+ "MB";
    } else {
        fileSizeString = df.format((double) fileS / 1073741824) \+ "GB";
    } return fileSizeString;
}** /*\*
 \* 转换文件大小,指定转换的类型 */
private static double FormetFileSize(long fileS, int sizeType) {
    DecimalFormat df = new DecimalFormat("#.00"); double fileSizeLong = 0; switch (sizeType) { case SIZETYPE_B:
            fileSizeLong = Double.valueOf(df.format((double) fileS)); break; case SIZETYPE_KB:
            fileSizeLong = Double.valueOf(df.format((double) fileS / 1024)); break; case SIZETYPE_MB:
            fileSizeLong = Double.valueOf(df.format((double) fileS / 1048576)); break; case SIZETYPE_GB:
            fileSizeLong = Double.valueOf(df.format((double) fileS / 1073741824)); break; default: break;
    } return fileSizeLong;
}

}

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2.使用

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/*\*
 \* 新增多媒体\-图片
 \*
 \* @param mediaphoto 多媒体-图片信息
 \* @return 结果 */ @Override
@Transactional public int insertMediaphoto(Mediaphoto mediaphoto) { if (StringUtils.isBlank(mediaphoto.getId())) {
        mediaphoto.setId(IdGen.uuid());
    }
    mediaphoto.setCreateTime(new Date());
   **mediaphoto.setFileSize(fileService.formatFileSize(mediaphoto.getFileName()));** int i = mediaphotoMapper.insertMediaphoto(mediaphoto);
    searchService.UpdateResourceEs(mediaphoto.getDocumentId()); return i;
}

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3.效果图