String插入问题,在{.........}和{.........}中插入“,”

想将下面的JSONString中{.........}和{.........}中插入个","变成"{.........},{.........},{.........}"
{"mailNo":"900000000504","datoubi":"粤 南山","packageName":"深圳南山包","packageCode":"69","isDelivery":"true","message":"成功","code":"1000"}
{"mailNo":"900000000504","datoubi":"粤 南山","packageName":"深圳南山包","packageCode":"69","isDelivery":"true","message":"成功","code":"1000"}
{"mailNo":"900000000504","datoubi":"粤 南山","packageName":"深圳南山包","packageCode":"69","isDelivery":"true","message":"成功","code":"1000"}

"}{" 替换为 "},{" 不就行了

能不能描述清楚点,是在android上解析时候插入数据,还是在服务器上插入?

这是JAVA上的,只是想将数据格式变成{.........},{.........},{.........},因为{.........}个体数不固定,感觉不会弄了。

这是后端组装需求还是前端解析需求啊,可以说清楚么

有道理~~傻了,谢谢

substring("}{","},{")