104 lines
2.7 KiB
Java
104 lines
2.7 KiB
Java
package cn.palmte.work.utils;
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import top.jfunc.common.crypto.symmetric.Base64;
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import java.io.*;
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/**
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* BASE64编码解码工具包
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* 依赖javabase64-1.3.1.jar
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*
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* @version 1.0
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*/
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public class Base64Utils {
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/**
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* 文件读取缓冲区大小
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*/
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private static final int CACHE_SIZE = 1024;
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/**
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* BASE64字符串解码为二进制数据
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*/
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public static byte[] decode(String base64) throws Exception {
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return Base64.decode(base64.getBytes());
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}
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/**
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* 二进制数据编码为BASE64字符串
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*/
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public static String encode(byte[] bytes) throws Exception {
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return Base64.encode(bytes);
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}
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/**
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* 将文件编码为BASE64字符串
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* 大文件慎用，可能会导致内存溢出
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*/
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public static String encodeFile(String filePath) throws Exception {
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byte[] bytes = fileToByte(filePath);
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return encode(bytes);
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}
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/**
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* BASE64字符串转回文件
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* @param filePath 文件绝对路径
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* @param base64 编码字符串
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*/
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public static void decodeToFile(String filePath, String base64) throws Exception {
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byte[] bytes = decode(base64);
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byteArrayToFile(bytes, filePath);
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}
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/**
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* 文件转换为二进制数组
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*
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* @param filePath 文件路径
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*/
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public static byte[] fileToByte(String filePath) throws Exception {
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byte[] data = new byte[0];
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File file = new File(filePath);
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if (file.exists()) {
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try( FileInputStream in = new FileInputStream(file);
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ByteArrayOutputStream out = new ByteArrayOutputStream(2048)) {
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byte[] cache = new byte[CACHE_SIZE];
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int nRead = 0;
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while ((nRead = in.read(cache)) != -1) {
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out.write(cache, 0, nRead);
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out.flush();
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}
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data = out.toByteArray();
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}
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}
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return data;
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}
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/**
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* 二进制数据写文件
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*
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* @param bytes 二进制数据
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* @param filePath 文件生成目录
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*/
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public static void byteArrayToFile(byte[] bytes, String filePath) throws Exception {
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File destFile = new File(filePath);
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if (!destFile.getParentFile().exists()) {
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destFile.getParentFile().mkdirs();
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}
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destFile.createNewFile();
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try(InputStream in = new ByteArrayInputStream(bytes);
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OutputStream out = new FileOutputStream(destFile)){
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byte[] cache = new byte[CACHE_SIZE];
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int nRead = 0;
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while ((nRead = in.read(cache)) != -1) {
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out.write(cache, 0, nRead);
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out.flush();
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}
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}
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}
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}
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