io.afu.utils.files.FileUtils Maven / Gradle / Ivy

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package io.afu.utils.files;

import io.afu.utils.exception.BaseException;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.rmi.server.ExportException;

public class FileUtils {


    /**
     * 获取带后缀的文件名
     * @param filePath 文件路径
     * @return String
     */
    public static String getFileNameByFilePath(String filePath){
        String fileName = null;
        if (filePath.contains("\\")){
            fileName =filePath.substring(filePath.lastIndexOf("\\")+1,filePath.length());
        }else {
            fileName = filePath.substring(filePath.lastIndexOf("/")+1,filePath.length());
        }
        return fileName;
    }

    /**
     * 获取不带后缀的文件名
     * @param filePath 文件路径
     * @return String
     */
    public static String getFileNameWithoutSuffix(String filePath) {
        String nameWithoutSuffix = null;
        String fileName = getFileNameByFilePath(filePath);
        nameWithoutSuffix = fileName.substring(0,fileName.lastIndexOf("."));
        return nameWithoutSuffix;
    }


    /**
     * 通过URL来获取文件后缀
     * @param url 文件url
     * @return 后缀名
     */
    public static String getFileNameByUrl(String url){
        String[] strs = url.split("\\?");
        String pureUrl = strs[0];
        return pureUrl.substring(pureUrl.lastIndexOf("/")+1,pureUrl.length());
    }

    /**
     * 获取文件的二进制代码
     * @param filePath 文件路径
     * @return 返回二进制数组
     * @throws BaseException 文件读取出错抛错
     */
    public static byte[] getBytesFromFilePath(String filePath) throws BaseException {
        byte[] buffer = null;
        try {
            File file = new File(filePath);
            FileInputStream fileInputStream = new FileInputStream(file);
            ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(1000);
            byte[] b = new byte[1000];
            int n;
            while ((n=fileInputStream.read(b))!=-1){
                byteArrayOutputStream.write(b,0,n);
            }
            fileInputStream.close();
            byteArrayOutputStream.close();
            buffer = byteArrayOutputStream.toByteArray();
        }catch (Exception e){
            throw new BaseException(e);
        }
        return buffer;
    }

    /**
     * 写入bytes 到文件
     * @param filePath 文件路径
     * @param bytes 字节数组
     * @throws BaseException 抛错
     */
    public static void writeBytesToFile(String filePath,byte[] bytes,Boolean add) throws BaseException {
        try (FileOutputStream fileOutputStream = new FileOutputStream(filePath,add)){
            fileOutputStream.write(bytes);
        }catch (Exception e){
            throw new BaseException(e);
        }
    }

    /**
     * 写入String
     * @param filePath 路径
     * @param toWrite 需要写入的String
     * @throws BaseException 抛错
     */
    public static void writeStringToFile(String filePath,String toWrite) throws BaseException {
        byte[] toWriteArray = toWrite.getBytes();
        writeBytesToFile(filePath,toWriteArray,false);
    }

    /**
     * 写入String
     * @param filePath 路径
     * @param toWrite 需要写入的String
     * @param add 是否追加到文件中
     * @throws BaseException 抛错
     */
    public static void writeStringToFile(String filePath,String toWrite,Boolean add) throws BaseException {
        byte[] toWriteArray = toWrite.getBytes();
        writeBytesToFile(filePath,toWriteArray,add);
    }


    /**
     * 判断文件是否存在
     * @param filePath 文件路径
     * @return 是否存在的布尔值
     * @throws BaseException 抛错
     */
    public static Boolean exist(String filePath) throws BaseException {
        File file = new File(filePath);
        return file.exists();
    }







}