json-lib

package cn.dip.util;

import java.io.File;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JsonConfig;

public class JsonUtil {
 
 /**
  * 公用的json分页方法
  * @param start 起始页
  * @param limit 终止页
  * @param list 传入的所有数据数组
  * @param config 设置过滤字段
  * @return
  */
 public static String pageFromList(int start,int limit,List list,JsonConfig config){
  int total = start + limit;
  if(total>list.size()){
   total = list.size();
  }
  List templist = list.subList(start, total);
  Map<String, Object> map = new HashMap<String, Object>();
  map.put("totalProperty", list.size());
        map.put("topics", templist);
       
 
  String logs = JSONObject.fromObject(map,config).toString();
       
        return logs;
 }
 
 public static String pageFromListWithoutConfig(int start,int limit,List list){
  int total = start + limit;
  if(total>list.size()){
   total = list.size();
  }
  List templist = list.subList(start, total);
  Map<String, Object> map = new HashMap<String, Object>();
  map.put("totalProperty", list.size());
        map.put("topics", templist);
       
 
  String logs = JSONObject.fromObject(map).toString();
       
        return logs;
 }
 
 public static String jsonFromObject(Object object,JsonConfig config){
  String jsonString = JSONObject.fromObject(object,config).toString();
  return jsonString;
 }
 
 public static String jsonFromList(List list , JsonConfig config){
  String jsonString = JSONArray.fromObject(list,config).toString();
  return jsonString;
 }
 public static String jsonFromListWithoutConfig(List list ){
  String jsonString = JSONArray.fromObject(list).toString();
  return jsonString;
 }
 public static String jsonFromObjectWithoutConfig(Object object){
  return JSONObject.fromObject(object).toString();
 }
 public static String javabean2json(Object object) {
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("success", true);
        map.put("data", object);
        return JSONObject.fromObject(map).toString();
    }
 public static String javabean2jsonwithconfig(Object object,JsonConfig config) {
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("success", true);
        map.put("data", object);
        return JSONObject.fromObject(map,config).toString();
    }

}