java JSON jar包

import net.sf.json.JSONArray; public static String toJson(Object resultobj) { if (resultobj != null) { JSONArray obj = JSONArray.fromObject(resultobj); return (obj.toString()); } return ""; } public void toJson(Object resultobj) throws Exception { if (resultobj != null) { // 返回json字符串 HttpServletResponse response = ServletActionContext.getResponse(); response.setContentType("text/html; charset=utf-8"); JSONArray obj = JSONArray.fromObject(resultobj); // 集合转为json PrintWriter out = response.getWriter(); out.println(obj.toString()); out.flush(); out.close(); } } //调用 ArrayList<StRain> list2=getData.StPptnRToStRain(); // 返回json字符串 toJson( list2); public class StRain { //时间 String time; //雨量 double val; }