// 解碼 Base64 字符串
        byte[] decodedBytes =Base64.decodeBase64(as);
        // 設(shè)置項(xiàng)目路徑下的文件路徑（例如保存為當(dāng)前工作目錄下的 decoded_image.jpg）
        String filePath = "/picture/"+name;
 
        // 保存解碼后的字節(jié)數(shù)組為圖像文件
        try (FileOutputStream fos = new FileOutputStream(filePath)) {
            fos.write(decodedBytes);
            System.out.println("文件已成功保存為: " + filePath);
        } catch (IOException e) {
            e.printStackTrace();
        }

var img = "https://img2.baidu.com/it/u=2163681967,1120787845&fm=253&fmt=auto&app=138&f=PNG?w=200&h=267";
    function getBase64Image(img) {
           var canvas = document.createElement("canvas");
           console.log(img.width,img.height)
           canvas.width = img.width;
           canvas.height = img.height;

           var ctx = canvas.getContext("2d");
           ctx.drawImage(img, 20, 20, 200, 200);
           var ext = img.src.substring(img.src.lastIndexOf(".")+1).toLowerCase();
           var dataURL = canvas.toDataURL("image/"+ext);
           return dataURL;
       }
    var canvas=document.querySelector('canvas');
    // 獲取畫筆
    var context=canvas.getContext('2d');
    // 創(chuàng)建一個(gè)img標(biāo)簽 構(gòu)造函數(shù)方式new Image();
    var image=new Image();
    image.crossOrigin = 'anonymous';
    // console.log(img);
    image.src=img
    console.log('image',image)
    // 繪制圖片,drawImage有5個(gè)參數(shù):要繪制得圖片/視頻,開始x、y軸位置,寬高
    image.onload=function(){
        context.drawImage(image,0,0,200,200);
        var base64 = getBase64Image(image);
           console.log(base64);
    }