package com.ruoyi.common.utils;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import org.springframework.web.context.request.RequestAttributes;

import org.springframework.web.context.request.RequestContextHolder;

import org.springframework.web.context.request.ServletRequestAttributes;

import com.ruoyi.common.core.text.Convert;

/**

 * 客户端工具类

 *

 * @author ruoyi

 */

public class ServletUtils

{

    /**

     * 获取String参数

     */

    public static String getParameter(String name)

    {

        return getRequest().getParameter(name);

    }

    /**

     * 获取String参数

     */

    public static String getParameter(String name, String defaultValue)

    {

        return Convert.toStr(getRequest().getParameter(name), defaultValue);

    }

    /**

     * 获取Integer参数

     */

    public static Integer getParameterToInt(String name)

    {

        return Convert.toInt(getRequest().getParameter(name));

    }

    /**

     * 获取Integer参数

     */

    public static Integer getParameterToInt(String name, Integer defaultValue)

    {

        return Convert.toInt(getRequest().getParameter(name), defaultValue);

    }

    /**

     * 获取request

     */

    public static HttpServletRequest getRequest()

    {

        return getRequestAttributes().getRequest();

    }

    /**

     * 获取response

     */

    public static HttpServletResponse getResponse()

    {

        return getRequestAttributes().getResponse();

    }

    /**

     * 获取session

     */

    public static HttpSession getSession()

    {

        return getRequest().getSession();

    }

    public static ServletRequestAttributes getRequestAttributes()

    {

        RequestAttributes attributes = RequestContextHolder.getRequestAttributes();

        return (ServletRequestAttributes) attributes;

    }

    /**

     * 将字符串渲染到客户端

     *

     * @param response 渲染对象

     * @param string 待渲染的字符串

     * @return null

     */

    public static String renderString(HttpServletResponse response, String string)

    {

        try

        {

            response.setContentType("application/json");

            response.setCharacterEncoding("utf-8");

            response.getWriter().print(string);

        }

        catch (IOException e)

        {

            e.printStackTrace();

        }

        return null;

    }

    /**

     * 是否是Ajax异步请求

     *

     * @param request

     */

    public static boolean isAjaxRequest(HttpServletRequest request)

    {

        String accept = request.getHeader("accept");

        if (accept != null && accept.indexOf("application/json") != -1)

        {

            return true;

        }

        String xRequestedWith = request.getHeader("X-Requested-With");

        if (xRequestedWith != null && xRequestedWith.indexOf("XMLHttpRequest") != -1)

        {

            return true;

        }

        String uri = request.getRequestURI();

        if (StringUtils.inStringIgnoreCase(uri, ".json", ".xml"))

        {

            return true;

        }

        String ajax = request.getParameter("__ajax");

        if (StringUtils.inStringIgnoreCase(ajax, "json", "xml"))

        {

            return true;

        }

        return false;

    }

}