不处理从数据库取出数据如下: 

String s1="{\"MsgId\":1,\"TotalCount\":10,\"FilterCount\":8,\"SentCount\":7,\"ErrorCount\":0}";

去掉转义符

import org.apache.commons.lang.StringEscapeUtils;

StringEscapeUtils.unescapeJava(s1)

解决后

{"MsgId":1,"TotalCount":10,"FilterCount":8,"SentCount":7,"ErrorCount":1}

将字符串json转换成json对象

com.gexin.fastjson.JSONArray medicalFieldsObject = com.gexin.fastjson.JSONArray.parseArray(arrayString);

还是谷歌搜索好用