Java生成Json字符串

public class Test01 {
public static void main(String[] args) {
// StringBuilder responseMsg = new StringBuilder();
// responseMsg.append("");
// responseMsg.append("");
// System.out.println(responseMsg.length());

    JSONObject jsonObj = new JSONObject();

// Map<String, String> ingredients = new HashMap<String, String>();
Date dNow = new Date( );
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
String dNowStr = dateFormat.format(dNow);
System.out.println("当前时间为: " + dNowStr);

    jsonObj.put("trans_date", dNowStr);

    jsonObj.put("curacc", "XXXXXXX");

// System.out.println(jsonObj);

    String json_to_string = JSONObject.toJSONString(jsonObj);

    System.out.println(json_to_string);

}

}