用java代碼，從數據庫中取出數據，轉換成json格式的文件，放到指定文件夾中

import org.json.JSONObject;

public void outJson(Object obj) throws Exception {

JSONObject json = new JSONObject(obj, false);

String rr = json.toString(1);

response.setCharacterEncoding("utf-8");

response.getOutputStream().write(rr.getBytes("utf-8"));

}