字符串拼接的问题

commons-web/src/main/java/com/yihu/ehr/controller/EnvelopRestEndPoint.java

@@ -159,12 +159,12 @@ public class EnvelopRestEndPoint extends BaseRestEndPoint {
     */
    protected String getRandomString(int length) {
        String str = "abcdefghijklmnopkrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        StringBuffer buffer = new StringBuffer();
        StringBuilder builder = new StringBuilder();
        Random random = new Random();
        for (int i = 0; i < length; i++) {
            int number = random.nextInt(str.length() - 1);
            buffer.append(str.charAt(number));
            int number = random.nextInt(str.length());
            builder.append(str.charAt(number));
        }
        return buffer.toString();
        return builder.toString();
    }
}