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				@ -167,12 +167,12 @@ public abstract class EnvelopRestEndpoint { 
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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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