将图片转成二进制并生成Base64编码字符串,再将二进制转换成各种图片-优快云博客

本文展示如何使用Java读取本地文件并将其转换为Base64编码的字符串，然后将Base64编码的字符串解码回原始图像。代码示例包括图像的读取、编码和解码过程。

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import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class TestImageBinary {
	static BASE64Encoder encoder = new sun.misc.BASE64Encoder();
	static BASE64Decoder decoder = new sun.misc.BASE64Decoder();

	public static void main(String[] args) {
		System.out.println(getImageBinary());

		base64StringToImage(getImageBinary());
	}

	static String getImageBinary(){
		File f = new File("c://20090709442.jpg");		
		BufferedImage bi;
		try {
			bi = ImageIO.read(f);
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			ImageIO.write(bi, "jpg", baos);
			byte[] bytes = baos.toByteArray();

			return encoder.encodeBuffer(bytes).trim();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return null;
	}

	static void base64StringToImage(String base64String){
		try {
			byte[] bytes1 = decoder.decodeBuffer(base64String);

			ByteArrayInputStream bais = new ByteArrayInputStream(bytes1);
			BufferedImage bi1 =ImageIO.read(bais);
			File w2 = new File("c://QQ.bmp");//可以是jpg,png,gif格式
			ImageIO.write(bi1, "jpg", w2);//不管输出什么格式图片，此处不需改动
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

}