fastjson对JSONObject中的指定字段重新赋值的实现

JSONObject对同一个key重新put时，新值就会取代旧值，没有set之类的方法

构建json string时，所有的引号都要转义

package xx;
 
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
 
// 对JSONObject中的指定字段重新赋值
public class testJsonReplace {
 
  public static void main(String[] args) {
 
		String query_jsonstr = "{"timezone":"GMT+0","action":"front_BRAND","format":"true","lan":"en_us","column":["day","impressions","clicks","ctr","brand_estimated_ecpm","pay_out"],"dimension":["day"],"filter":{"posid":{"op":"in","value":"2454105"}},"start":1528761600000,"end":1529452800000}";
		JSonObject query = JSON.parseObject(query_jsonstr);
 
		if (query.getJSonObject("filter") != null) {
			JSonObject posJson = new JSonObject();
			posJson.put("op", "in");
			posJson.put("value", "2454117");
			query.getJSonObject("filter").put("posid", posJson);
		}
    String posid = query.getJSonObject("filter").getJSonObject("posid").getString("value");
		String newJsonStr = query.toJSonString();
		System.out.println(newJsonStr);
  }
}

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