生成用户默认头像
@Test
public void getPng(){
String simpleUUID = IdUtil.simpleUUID();
StringBuilder stringBuilder=new StringBuilder();
stringBuilder.append("https://www.gravatar.com/avatar/")
.append(simpleUUID+".png")
.append("?f=y&")
.append("d=identicon&")
.append("r=g");
long size = HttpUtil.downloadFile(stringBuilder.toString(), FileUtil.file("E:\\touxiang\\"));
System.out.println("Download size: " + size);
}
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