encapsulate some queue class for more benefits to use Amazon SQS
when use these class to invoke Amazon SQS, you must run a client in local, the client you can download a jar from: https://github.com/adamw/elasticmq
when you download the jar like: elasticmq-server-0.13.8.jar
you can use command run it in local like: java -jar elasticmq-server-0.13.8.jar
finally, you can run the test case of SqsTest
you can find some document in Amazon website: http://docs.aws.amazon.com/zh_cn/sdk-for-java/v1/developer-guide/examples-sqs-messages.html