java中base64转图片

Java中，可以使用Base64类将Base64编码的字符串转换为图片。以下是一个示例代码：

import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Base64;

public class Base64ToImage {
    public static void main(String[] args) {
        String base64Str = "iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAACW0lEQVR4nLWTT0jTURzHv7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7MzO7