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How to convert list data into json in java

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天涯浪人
天涯浪人 2020-11-30 06:57

I have a function which is returning Data as List in java class. Now as per my need, I have to convert it into Json Format.

Below is my fun

7条回答
  • 刺人心
    刺人心 (楼主)
    2020-11-30 07:11

    i wrote my own function to return list of object for populate combo box : 

    public static String getJSONList(java.util.List list,String kelas,String name, String label) {
        try {
            Object[] args={};
            Class cl = Class.forName(kelas);
            Method getName = cl.getMethod(name, null);
            Method getLabel = cl.getMethod(label, null);
            String json="[";
            for (int i = 0; i < list.size(); i++) {
            Object o = list.get(i);
            if(i>0){
                json+=",";
            }
            json+="{\"label\":\""+getLabel.invoke(o,args)+"\",\"name\":\""+getName.invoke(o,args)+"\"}";
            //System.out.println("Object = " + i+" -> "+o.getNumber());
            }
            json+="]";
            return json;
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(JSONHelper.class.getName()).log(Level.SEVERE, null, ex);
        } catch (Exception ex) {
            System.out.println("Error in get JSON List");
            ex.printStackTrace();
        }
        return "";
    }



    and call it from anywhere like : 
    


    String toreturn=JSONHelper.getJSONList(list, "com.bean.Contact", "getContactID", "getNumber");

    
    
    
             
    
                                                        
    
            
            
    
              
                
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