Gson解决Bean to Json带有复杂结构或者循环的问题

	// 打印bean信息
	private void logServiceBean(Object t){
		LogUtility.logInfo("QLB Run Timestamp ======== QlbQaeApiService.logServiceBean start");
		try {
			// chenqing 2016/6/3 use gson
			String json = new GsonBuilder().excludeFieldsWithoutExposeAnnotation().create().toJson(t);
			LogUtility.logInfo("logServiceBean:"+json);
		} catch (Exception e) {
			// 如果不能转换，直接跳过
			LogUtility.logError(this, "logServiceBean json转换异常:", e);
		}
		LogUtility.logInfo("QLB Run Timestamp ======== QlbQaeApiService.logServiceBean end");
	}

public class QlbInstance implements Serializable {
	private static final long serialVersionUID = 6163926075819929084L;
	@Expose
	private String id;
	@Expose
	private String qlbInstanceName;
	@Expose
	private HashSet vipPorts = new HashSet();

}

在生成的json字符串中,所有没有加 @Expose的字段就不会被包含进去.关联对象中也可以使用.