修改

src/main/java/com/llisoft/pay/service/AliPayService.java

@@ -50,7 +50,7 @@ public class AliPayService {
 	/** 编码集，支持GBK/UTF-8 */
 	private String charset = "UTF-8";
 	/** 商户生成签名字符串所使用的签名算法类型，目前支持RSA2和RSA，推荐使用RSA2 */
-	private String signType = "RSA";
+	private String signType = "RSA2";
 	
 	@Autowired
 	private PayService payService;