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Base64可以将任何二进制文件以可打印字符的方式表示，也就是说，任何二进制文件都可以通过Base64编码技术转成字符串。在Java中，可以使用Base64类实现。
Python中的实现：https://blog.csdn.net/LONG_Yi_1994/article/details/112851047
1、图片（二进制文件）转字符串
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Base64;
public class ImageBase64Utils {
public static void main(String[] args) throws IOException {
FileInputStream inputStream = null;
try {
Base64.Encoder encoder = Base64.getEncoder();
inputStream = new FileInputStream("e://aa.jpg");
int available = inputStream.available();
byte[] bytes = new byte[available];
inputStream.read(bytes);
String base64Str = encoder.encodeToString(bytes);
System.out.println(base64Str);
} catch (Exception e) {
e.printStackTrace();
}finally {
inputStream.close();
}
}
}
2、字符串转成图片（二进制文件）
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Base64;
public class StrBase64Utils {
public static void main(String[] args) throws IOException {
FileOutputStream outputStream = null;
try {
Base64.Decoder decoder = Base64.getDecoder();
byte[] bytes = decoder.decode("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");
outputStream = new FileOutputStream("e://temp.jpg");
outputStream.write(bytes);
} catch (Exception e) {
e.printStackTrace();
}finally {
outputStream.close();
}
}
}
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