转成BASE64编码

在JMETER添加前置处理器

import org.apache.commons.net.util.Base64;

String source = mClientID+query+ts; //source为源字符串即要转换的字符串

byte[] encodedBytes = Base64.encodeBase64(source.getBytes("UTF-8"));
String encoded = new String(encodedBytes);  //encoded为BASE64编码