lx-admin-backend/ruoyi-common/src/main/java/com/ruoyi/common/utils/ServletUtils.java

package com.ruoyi.common.utils;

import cn.hutool.core.convert.Convert;
import cn.hutool.extra.servlet.ServletUtil;
import cn.hutool.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.web.context.request.RequestAttributes;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.nio.charset.StandardCharsets;

/**
 * 客户端工具类
 *
 * @author ruoyi
 */
public class ServletUtils extends ServletUtil {
	/**
	 * 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Boolean参数
     */
    public static Boolean getParameterToBool(String name) {
        return Convert.toBool(getRequest().getParameter(name));
    }

    /**
     * 获取Boolean参数
     */
    public static Boolean getParameterToBool(String name, Boolean defaultValue) {
        return Convert.toBool(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.setStatus(HttpStatus.HTTP_OK);
			response.setContentType(MediaType.APPLICATION_JSON_VALUE);
			response.setCharacterEncoding(StandardCharsets.UTF_8.toString());
			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.equalsAnyIgnoreCase(uri, ".json", ".xml")) {
			return true;
		}

		String ajax = request.getParameter("__ajax");
		if (StringUtils.equalsAnyIgnoreCase(ajax, "json", "xml")) {
			return true;
		}
		return false;
	}

	public static String getClientIP() {
		return getClientIP(getRequest());
	}

}