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 public class JsonUtils {
 
 
 
 
 
 
 
 public static String toJsonStr(Object object) throws Exception {
 return new ObjectMapper().writeValueAsString(object);
 }
 
 
 
 
 
 
 public static void writeJsonStr(HttpServletResponse response, Object object) {
 response.setContentType("application/json;charset=utf-8");
 try {
 String jsonStr = toJsonStr(object);
 response.getWriter().write(jsonStr);
 } catch (Exception e) {
 e.printStackTrace();
 }
 }
 }
 
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