springboot设置接口的返回值编码格式

@ResponseBody
@RequestMapping(value = "get_method_test", method = RequestMethod.GET,produces = "application/json;charset=GBK")
public String getMethodTest(HttpServletRequest request) {

1、GBK　　
　　produces = "application/json;charset=GBK"
2、utf-8
　　produces = "application/json;charset=utf-8"
3、ISO-8859-1　　
　　produces = "application/json;charset=ISO-8859-1"