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@postmapping("/downloadzip")
    public void downloadcerts(httpservletrequest request, httpservletresponse response, @requestbody list<string> ids) throws unsupportedencodingexception {
    	//文件流octet-stream
        response.setcontenttype("application/octet-stream");
        response.setcharacterencoding("utf-8");
        response.addheader("content-disposition", "attachment;filename=" + urlencoder.encode("圖片.zip", "utf-8"));
        try {
            zipoutputstream resultstream = new zipoutputstream(response.getoutputstream());
			// 這里是查詢數據庫
            list<map> result = service.downloadcerts(ids);
            byte[] buffer = new byte[10240];
            for (map map :result) {
            	//因為數據庫保存的是圖片的base64 所以需要轉換
                base64decoder decoder = new base64decoder();
                file certface = new file("temp.png");
                outputstream out = new fileoutputstream(certface);
                byte[] b = decoder.decodebuffer(((string) map.get("certb64")).split(",")[1]);
                for (int i = 0; i <b.length ; i++) {
                    if (b[i] <0) {
                        b[i]+=256;
                    }
                }
                out.write(b);
                out.flush();
                out.close();
                //到這里 base64 轉換成了圖片
				//往zip里面壓入第一個文件  本地文件
                resultstream.putnextentry(new zipentry("本地圖片.png" ));
                inputstream stream = new fileinputstream(new file("temp.png"));
                int len;
                // 讀入需要下載的文件的內容，打包到zip文件
                while ((len = stream.read(buffer)) > 0) {
                    resultstream.write(buffer, 0, len);
                }
                resultstream.closeentry();
                stream.close();
                resultstream.flush();
                //第一個文件壓入完成 關閉流 刷新一下緩沖區
                // 往zip里面壓入第二個文件  網絡文件 例：https://profile.csdnimg.cn/8/c/e/3_blogdevteam
                resultstream.putnextentry(new zipentry("網絡圖片.png"));
                url url = new url("https://profile.csdnimg.cn/8/c/e/3_blogdevteam";);
                string str = url.tostring();
                urlconnection connection = url.openconnection();
                inputstream backstream = connection.getinputstream();
                // 讀入需要下載的文件的內容，打包到zip文件
                while ((len = backstream.read(buffer)) > 0) {
                    resultstream.write(buffer, 0, len);
                }
                resultstream.closeentry();
                backstream.close();
                resultstream.flush();
				//第二個文件壓入完成 關閉流 刷新一下緩沖區
            }
            resultstream.close();
            //關閉流
        } catch (ioexception e) {
            e.printstacktrace();
        }
    }

download(this.ids).then((response) =>{
	if (response.status == 200) {
	    let url = window.url.createobjecturl(new blob([response.data]))
	    let link= document.createelement('a')
	    link.style.display='none'
	    link.href=url
	    link.setattribute('download', "圖片.zip")    // 自定義下載文件名（如exemple.txt）
	    document.body.appendchild(link)
	    link.click()
	}else{
	    this.$message.error("下載出錯了");
	}
});

responsetype:'blob',