Ajax调用返回json数组，对象 (JSONArray.fromObject)

   JSONArray和JSONObject的详细使用：http://blog.csdn.net/yangbobo1992/article/details/8350765
　　/**
     * ajax调用返回json数组
     * @param list
     */
    public void printList(List<?> list){
        HttpServletResponse response = ServletActionContext.getResponse();  //获取response实例
        response.setContentType("text/html");　　　　　　//设置输出类型
        response.setCharacterEncoding("UTF-8"); //设置输出编码
        
        /*JsonConfigFactory.getInstance();
        JSONArray jsonArray = new JSONArray();
        jsonArray.addAll(list, JsonConfigFactory.getInstance());
        */
        try {
            response.getWriter().print(JSONArray.fromObject(list, JsonConfigFactory.getInstance()));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    /**
     * ajax调用返回json对象
     * @param obj
     */
    public void printObject(Object obj){
        HttpServletResponse response = ServletActionContext.getResponse();
        response.setContentType("text/html");
        response.setCharacterEncoding("UTF-8");
        try {
            response.getWriter().print(JSONObject.fromObject(obj,JsonConfigFactory.getInstance()));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    /**
     * ajax调用返回json对象
     * @param obj
     */
    public void printSting(String str){
        HttpServletResponse response = ServletActionContext.getResponse();
        response.setContentType("text/html");
        response.setCharacterEncoding("UTF-8");
        try {
            response.getWriter().print(str);
        } catch (IOException e) {
            e.printStackTrace();
        }