json字符串中key對(duì)應(yīng)的value值如何進(jìn)行修改

LinkedHashMap<String, Object> json = JSON.parseObject(你的JSON,LinkedHashMap.class,Feature.OrderedField);
JSONObject jsonObject=new JSONObject(true);
jsonObject.putAll(json);
//更新頻度
 jsonObject.put("key", "P");//替換key對(duì)應(yīng)的值
 String new_text = jsonObject.toJSONString();

public class Test {
 
  /**
   * @param args the command line arguments
   */
  public static void main(String[] args) throws JSONException{
    // TODO code application logic here.
    //已有Json格式字符串{"id":"10001","name":"肉類","menus":[{"name":"牛肉","price":"30.00"},{"name":"羊肉","price":"20.00"}]}
    //需求是將牛肉的price改為50.00
    String json="{\"id\":\"10001\",\"name\":\"肉類\",\"menus\":[{\"name\":\"牛肉\",\"price\":\"30.00\"},{\"name\":\"羊肉\",\"price\":\"20.00\"}]}";
    System.out.println("1. "+json);
    JSONObject kindJson=new JSONObject(json);//將string轉(zhuǎn)為jsonobject
    String menuJson=kindJson.getString("menus");//獲取到menus
    JSONArray menus=new JSONArray(menuJson);//再將menuJson轉(zhuǎn)為jsonarray
    System.out.println("2. "+menus);
    JSONObject beefJson= menus.getJSONObject(0);//根據(jù)下標(biāo)0（類似數(shù)組）獲取牛肉的json對(duì)象
    beefJson.put("price", "50.00");//直接提交price的key，如果該key存在則替換value
    menus.put(0, beefJson);//覆蓋掉原來的值
    
    System.out.println("3. "+beefJson);
    System.out.println("4. "+menus);//替換完后打印查看
    kindJson.put("menus", menus);//再將menus覆蓋
    
    json=kindJson.toString();//賦值
    System.out.println("5. "+json);//替換完成    
  }  
}