Logstash使用codec处理json数据

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file {
	path => "/home/tomcat/tomcat7-8080-my/logs/my.log"
	start_position => beginning
	type => behavior
	codec => json {
		charset => "UTF-8"
	}
	add_field => {
		"machineIp"=>"192.168.1.3"
		"machineType"=>"test"
	}
}