java中json对象有没有方法可以把null值转换成空字符串

Question

如题所述

Answer 1

private ValueFilter filter = new ValueFilter() {
@Override
public Object process(Object obj, String s, Object v) {
if(v==null)
return "";
return v;
}
};
JSON.toJSONString(jsonMap, filter)本回答被提问者采纳