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封装了mybatis的crud
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package com.zys.mybatis.utils;

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.BufferedReader;
import java.io.IOException;
import java.util.Enumeration;
import java.util.LinkedHashMap;
import java.util.Map;

/**
 * @author zys
 * @version 1.0
 * @date 2021/1/14 10:02
 */
public class ServletUtils
{
    /**
     * 获取String参数
     */
    public static String getParameter(String name) {
        return getRequest().getParameter(name);
    }

    /**
     * 获取request
     */
    public static HttpServletRequest getRequest() {
        return getRequestAttributes().getRequest();
    }

    /**
     * 获取response
     */
    public static HttpServletResponse getResponse() {
        return getRequestAttributes().getResponse();
    }

    public static String getHeader(String headerKey){
        return getRequest().getHeader(headerKey);
    }

    /**
     * 获取session
     */
    public static HttpSession getSession() {
        return getRequest().getSession();
    }

    public static ServletRequestAttributes getRequestAttributes() {
        RequestAttributes attributes = RequestContextHolder.getRequestAttributes();
        return (ServletRequestAttributes) attributes;
    }

    public static Map getHeaders(HttpServletRequest request) {
        Map map = new LinkedHashMap<>();
        Enumeration enumeration = request.getHeaderNames();
        if (enumeration != null) {
            while (enumeration.hasMoreElements()) {
                String key = enumeration.nextElement();
                String value = request.getHeader(key);
                map.put(key, value);
            }
        }
        return map;
    }

    /**
     *获取 request 中用POST方式"Content-type"是
     * "application/json"发送的 json数据
     * @param request
     * @return
     */
    public static String getPostByJson(HttpServletRequest request) {
        try {
            BufferedReader reader = request.getReader();
            char[] buf = new char[512];
            int len = 0;
            StringBuilder contentBuffer = new StringBuilder();
            while ((len = reader.read(buf)) != -1) {
                contentBuffer.append(buf, 0, len);
            }
            return contentBuffer.toString();
        }catch (IOException e){
            return null;
        }
    }

    /**
     * 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(200);
            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 (inStringIgnoreCase(uri, ".json", ".xml")) {
            return true;
        }

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

    private static boolean inStringIgnoreCase(String str, String... strs) {
        if (str != null && strs != null) {
            for (String s : strs) {
                if (str.equalsIgnoreCase(trim(s))) {
                    return true;
                }
            }
        }
        return false;
    }

    private static String trim(String str) {
        return (str == null ? "" : str.trim());
    }
}