图片与字符串互相转换

r囧r小猫 2022-05-11 08:56 185阅读 0赞

图片文件-----》字符串  ：图片需要先读取成byte\[\] ，再使用BASE64将byte\[\] 编码后成为字符串；

字符串-----》图片文件 ：先将字符串使用Base64解码得到byte\[\] ,然后写出成为文件；

package com.test;
    
    import java.io.BufferedInputStream;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;
    import java.util.Base64;
    
    public class Test {
    
    	public static void main(String[] args) throws IOException {
    		String path = "D:\\B_Link.png"; // 图片资源路径
    		File file = new File(path);
    		String imageStr = getImageStr(file);
    		System.out.println("BASE64后的图片字符串：" + imageStr);
    
    		File imageFile = getImageFile(imageStr);
    		System.out.println(imageFile.getAbsolutePath());
    
    	}
    
    	public static String getImageStr(File imageFile) {
    		InputStream in = null;
    		try {
    			in = new BufferedInputStream(new FileInputStream(imageFile));
    			byte[] data = new byte[in.available()];
    			in.read(data);
    			in.close();
    			String imageStr = new String(Base64.getEncoder().encode(data));
    			return imageStr;
    
    		} catch (IOException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    		return null;
    	}
    
    	public static File getImageFile(String imageStr) {
    		File file = new File("D:\\" + System.currentTimeMillis() + ".png");
    		try {
    			OutputStream out = new FileOutputStream(file);
    			byte[] data = Base64.getDecoder().decode(imageStr);
    			out.write(data);
    			out.flush();
    			out.close();
    		} catch (IOException e) {
    			e.printStackTrace();
    		}
    		return file;
    	}
    
    }