|  | @ -167,12 +167,12 @@ public abstract class EnvelopRestEndpoint {
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				|  |  |     }
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				|  |  | 
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				|  |  |     protected String randomString(int length) {
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				|  |  |         String str = "abcdefghigklmnopkrstuvwxyzABCDEFGHIGKLMNOPQRSTUVWXYZ0123456789";
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				|  |  |         String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
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				|  |  |         StringBuffer buffer = new StringBuffer();
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				|  |  |         Random random = new Random();
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				|  |  |         for (int i = 0; i < length; i++) {
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				|  |  |             int number = random.nextInt(str.length());//0~61
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				|  |  |             buffer.append(str.charAt(number));
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				|  |  |             int pos = random.nextInt(str.length());
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				|  |  |             buffer.append(str.charAt(pos));
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				|  |  |         }
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				|  |  |         return buffer.toString();
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				|  |  |     }
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