commons-codec-1.8使用Base64编解码

最新推荐文章于 2021-08-30 10:38:24 发布

jis117

最新推荐文章于 2021-08-30 10:38:24 发布

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本文介绍了一个Java程序，该程序能够将图片文件转换为Base64编码，并将编码后的字符串写入文本文件中，再从文本文件读取Base64编码并还原成图片。

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package com;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.commons.codec.binary.Base64;

public class R {

	public static void main(String[] args) throws Exception {
		Base64WithImage t = new Base64WithImage();
		t.process();
	}

	public static Exception test() throws Exception {
		try {
			throw new IOException();
		} catch (IOException e) {
			System.out.println("cath");
			return new Exception();
		} finally {
			System.out.println("final");
		}
	}
}

class Base64WithImage {
	public static String TXT = "E:/test.txt";
	public static String IMAGE = "E:/test_copy.png";
	public static byte[] data;
	public static String content;

	public Base64WithImage() throws IOException {
		File file = new File(IMAGE);
		FileInputStream in = new FileInputStream(file);
		data = new byte[in.available()];
		in.read(data);
		in.close();
	}

	public String image2Base64() throws IOException {
		/*
		 * Base64 encoder = new Base64(); data = encoder.encode(data);
		 */
		data = Base64.encodeBase64(data);
		System.out.println(data);
		StringBuffer sb = new StringBuffer();

		for (byte bt : data) {
			sb.append((char) bt);
		}
		content = sb.toString();
		return sb.toString();
	}

	public void writeBase642TXT() throws IOException {
		File file = new File(TXT);
		FileOutputStream fos = new FileOutputStream(file);

		fos.write(content.getBytes());
		fos.close();
	}

	public void Base642Image() throws IOException {
		byte[] da = Base64.decodeBase64(content);

		FileOutputStream fos = null;
		try {
			File file = new File(TXT);
			fos = new FileOutputStream(file);
			fos.write(da);
			fos.flush();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			fos.close();
		}
	}

	public String readTXT() throws IOException {
		File file = new File(TXT);
		FileInputStream fis = new FileInputStream(file);
		System.out.println(fis.available());

		byte[] c = new byte[fis.available()];
		fis.read(c);
		fis.close();
		System.out.println(new String(c));
		return new String(c);
	}

	public void writeImage(byte[] data) throws IOException {
		File file = new File("E:/tt.png");
		FileOutputStream fos = new FileOutputStream(file);
		fos.write(data);
		fos.flush();
		fos.close();
	}

	public void process() throws IOException {
		image2Base64();
		writeBase642TXT();

		String c = readTXT();
		byte[] da = Base64.decodeBase64(c);
		writeImage(da);
	}
}