struts1+json的应用

 struts1不像struts2一样，并未对json做集成，因此要使用json就必须自己写代码实现json对象的封装，可以在BaseAction中写一个共通方法，用于封装后台的数据为json对象并发送到前台：

public class BaseAction extends Action{

private String encoding = "UTF-8";
private String contentType = "application/json";

/**
 * to make JSON object that will be returned to the front-end and send it
 *
 * @param response response
 * @param objName jsonObjectName
 * @param obj object that is used to make jsonObject
 * @throws IOException
 */
protected void makeJSONObject(HttpServletResponse response, String objName, Object obj) throws IOException {

this.contentType = contentType + ";charset=" + encoding;
LogUtil.log.info("Set contentType to: " + contentType);

JSONObject jsonObj = new JSONObject();
jsonObj.put(objName, obj);

response.setContentType(contentType);
response.setCharacterEncoding(encoding);
PrintWriter pw = response.getWriter();
pw.write(jsonObj.toString());
pw.flush();

}
}