java 从流中获取的字符串matches()方法返回false

在java方法中从cvs文件读取一串字符串数据,使用matches方法进行数字正则匹配,总是返回false;

            // 获取Object,返回结果为OSSObject对象
            OSSObject object = ossTools.getObject(mallCouponDirect.getFilename());
            // 获取Object的输入流
            InputStream objectContent = object.getObjectContent();
            BufferedReader br = new BufferedReader(new InputStreamReader(objectContent,"utf8"));
            String s = "";
            List<Integer> uidList = new ArrayList<Integer>();
            while((s = br.readLine())!=null){
                System.out.println(s);//打印结果是:159042459
                boolean a = s.matches("[0-9]+");//a 总是false
                if(a){
                    //...other codes
                    }
                }
            }
            

如果在while循环里直接把s设为“159042459”,a为true;

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