private String readFileContent(String file) {
		try {
			return FileUtils.readFileToString(
					ResourceUtils.getFile(StringUtils.trimAllWhitespace(file)),
					Charset.defaultCharset());
		}
		catch (IOException e) {
			return "";
		}
	}
@author <a href="mailto:fangjian0423@gmail.com">Jim</a>
spring-cloud-alibaba-starters/spring-cloud-alibaba-sentinel-datasource/src/test/java/com/alibaba/cloud/sentinel/datasource/SentinelConverterTests.java