今天写东西，发现JSONObject.fromObject()，方法，会把value是null的字段，转为0或""，就自己写了一个方法，如果value是null就不转换
package com.moji.feedstreamapplet.util;
import java.lang.reflect.Field;
import com.moji.feedstreamapplet.bean.ExpandParam;
import net.sf.json.JSONObject;
public class JsonUtil {
public static JSONObject jsonObjectFromBean(Object obj){
String className = obj.getClass().toString().split(" ")[1];
JSONObject jsonObj = new JSONObject();
try {
Class<?> c = Class.forName(className);
Field[] fields = c.getDeclaredFields();
for(Field field : fields){
field.setAccessible(true);
Object val = field.get(obj);
if(val != null && !val.toString().isEmpty()){
jsonObj.put(field.getName(), val);
}
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SecurityException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
return jsonObj;
}
public static void main(String[] args) {
ExpandParam ep = new ExpandParam();
ep.setDelete("1");
ep.setImageNumber(23);
ep.setIsCaputer(null);
JSONObject jsonObj = JsonUtil.jsonObjectFromBean(ep);
System.out.println(jsonObj);
}
}另一个方法：
JsonConfig config = new JsonConfig();
config.setJsonPropertyFilter(new PropertyFilter() { @Override
public boolean apply(Object source, String name, Object value) {
if (value == null || "".equals(value)) {
return true;
}
return false;
}
});
SONObject.fromObject(param,config);
就是JasonConfig