Struts2.0中Action直接返回字符串
对于Struts2中Action中返回字符串的处理，比如做级联时，就可能用到返回json(字符串)的数据，些时Action该返回字符串,其实：让Action中的返回字符串的方法，直接return null;并在return之前用输出流输出字符串就可以了，跟servlet输入HTMl方法一样。
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public class CscandmsAction extends ActionSupport implements ServletResponseAware{Logger log=Logger.getLogger(CscandmsAction.class); private HttpServletResponse response;public void setServletResponse(HttpServletResponse arg0) {this.response=arg0;}/** * country dms做级联时返回的JSON数据(字符串) * @param numcountryguid * @return */public String getTestJSON() throws Exception{response.setCharacterEncoding("utf-8");PrintWriter pw=null;try {pw = response.getWriter();pw.write("JSON字符串");} catch (IOException e) {log.error(e.getMessage(),e.fillInStackTrace());}//response.setCharacterEncoding("utf-8");pw.flush();pw.close();return null;}}?