Ajax的工具类AjaxUtils，使用struts返回Json类型

public class AjaxUtil {  
  
    /** 
     * ajax response method<br/> 
     * 如果出现异常，则返回错误代码505 
     *  
     * @param response 
     * @param text 
     * ajax返回的内容 
     *  
     */  
    public static void ajaxResponse(HttpServletResponse response,String text) {  
        try {  
            response.setContentType("text/html;charset=utf-8");  
            response.getWriter().write(text);  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
    }  
  
    /** 
     * <pre> 
     * 注意：ajax请求必须携带：jsonnp请求callback 
     *  
     * eg: 
     * $.getJSON(path + "ajax/news/comment.go?newsId=" + newsId + "&content=" +content+ "&callback=?",function(data) { 
     *   alert(data['val']); 
     * }); 
     *  
     * </pre> 
     *  
     * @param response 
     * @param msg 
     */  
    public static void jsonnpResponse(HttpServletResponse response,String callback,String msg) {  
        try {  
            response.setContentType("text/html;charset=utf-8");  
            response.getWriter().write(callback + "(" + msg + ")");  
        } catch (IOException e) {  
  
        }  
    }  
  
    /** 
     * 异常操作，需要浏览器地址返回上一步 
     *  
     * @param response 
     * @param alertMsg 
     *            弹出提示信息 
     */  
    public static void ajaxResponseRollBack(HttpServletResponse response,String msg) {  
        try {  
            response.setContentType("text/html;charset=utf-8");  
            response.getWriter().write(  
                    "<script type='text/javascript'>alert('" + msg  
                            + "');window.history.back();</script>");  
        } catch (IOException e) {  
            // LogConsoleUtil.write(Common.class,"ajaxResponseRollBack()",// e.getMessage());  
        }  
    }  
  
    // ajaxJSON返回  
    public static void ajaxJSONResponse(HttpServletResponse response,String str,Object object) {  
        response.setContentType("text/json;charset=utf-8");  
        JSONObject json = new JSONObject();  
        json.put(str,object);  
        try {  
            response.getWriter().write(json.toString());  
        } catch (IOException e) {  
            e.printStackTrace();  
        }  
    }  
  
    public static void ajaxResponseAlert(HttpServletResponse response,String msg) {  
        try {  
            response.setContentType("text/html;charset=utf-8");  
            response.getWriter().write(  
                    "<script type='text/javascript'>alert('" + msg  
                            + "');</script>");  
        } catch (IOException e) {  
            // LogConsoleUtil.write(Common.class,// e.getMessage());  
        }  
    }  
  
    public static Integer StringToInteger(HttpServletRequest request,String name) {  
        String obj = request.getParameter(name);  
        Integer result = -1;  
        if (obj != null) {  
            result = Integer.parseInt(obj);  
        }  
        return result;  
    }  
  
}