spring mvc 返回String 中文是乱码的问题

解决办法：

加上produces

@RequestMapping(value="/user}",method=RequestMethod.GET,produces="application/json; charset=utf-8")

@RequestMapping(value="/user",method=RequestMethod.GET,produces="application/json; charset=utf-8")
	public @ResponseBody String treeFirst(@PathVariable String groupType){