layui登录后token问题详解

layui是一个非常简单且实用的后台管理系统搭建框架，里面的插件丰富使用简单，只需要在原有基础上进行修改即可，但是在数据处理方面略显薄弱，内置的jquery在实际过程中略显不足，若是能添加内置的mvc模式框架那就更好了

先介绍layui在登录这一块的使用，

登录问题主要是在token的存储调用上，先贴出后台的创建token以及拦截器的代码

首先引入jar包

<dependency>
            <groupId>io.jsonwebtoken</groupId>
            <artifactId>jjwt</artifactId>
            <version>0.7.0</version>
            <exclusions>
                <exclusion>
                    <artifactId>jackson-databind</artifactId>
                    <groupId>com.fasterxml.jackson.core</groupId>
                </exclusion>
            </exclusions>
        </dependency>

token使用io.jsonwebtoken ，可以自定义秘钥，并存储登录信息

package com.zeus.utils;
import cn.hutool.json.JSON;
import cn.hutool.json.JSONObject;
import cn.hutool.json.JSONUtil;
import com.zeus.constant.CommonConstants;
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.JwtBuilder;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.crypto.spec.SecretKeySpec;

import javax.xml.bind.DatatypeConverter;
import java.security.Key;
import java.util.Date;

public class TokenUtil {
    private static Logger LOG = LoggerFactory.getLogger(TokenUtil.class);

    /**
     * 创建TOKEN
     *
     * @param id, issuer, subject, ttlMillis
     * @return java.lang.String
     * @methodName createJWT
     * @author fusheng
     * @date 2019/1/10
     */
    public static String createJWT(String id, String issuer, String subject, long ttlMillis) {

        SignatureAlgorithm signatureAlgorithm = SignatureAlgorithm.HS256;

        long nowMillis = System.currentTimeMillis();
        Date now = new Date(nowMillis);

        byte[] apiKeySecretBytes = DatatypeConverter.parseBase64Binary("englishlearningwebsite");
        Key signingKey = new SecretKeySpec(apiKeySecretBytes, signatureAlgorithm.getJcaName());

        JwtBuilder builder = Jwts.builder().setId(id)
                .setIssuedAt(now)
                .setSubject(subject)
                .setIssuer(issuer)
                .signWith(signatureAlgorithm, signingKey);

        if (ttlMillis >= 0) {
            long expMillis = nowMillis + ttlMillis;
            Date exp = new Date(expMillis);
            builder.setExpiration(exp);
        }
        return builder.compact();
    }

    /**
     * 解密TOKEN
     *
     * @param jwt
     * @return io.jsonwebtoken.Claims
     * @methodName parseJWT
     * @author fusheng
     * @date 2019/1/10
     */
    public static Claims parseJWT(String jwt) {
        Claims claims = Jwts.parser()
                .setSigningKey(DatatypeConverter.parseBase64Binary("englishlearningwebsite"))
                .parseClaimsJws(jwt).getBody();
        return claims;
    }

}

解密主要使用到 parseJWT 方法

public static Contact getContact(String token) {
        Claims claims = null;
        Contact contact = null;
        if (token != null) {
         //得到claims类
            claims = TokenUtil.parseJWT(token);
            cn.hutool.json.JSONObject jsonObject = JSONUtil.parseObj(claims.getSubject());
            contact = jsonObject.get("user", Contact.class);
        }
        return contact;
    }

claims 中是解密后的token类，存储token中的全部信息

//解密token          
claims = TokenUtil.parseJWT(token);        //得到用户的类型
    String issuer = claims.getIssuer();        //得到登录的时间
    Date issuedAt = claims.getIssuedAt();         //得到设置的登录id
    String id = claims.getId();    //claims.getExpiration().getTime() > DateUtil.date().getTime() ,判断tokern是否过期        
    //得到存入token的对象          
    cn.hutool.json.JSONObject jsonObject = JSONUtil.parseObj(claims.getSubject());        
    Contact  contact = jsonObject.get("user", Contact.class);

创建好的token会在页面中放置到请求头中，后台通过来拦截器来判断是否过期，若过期则拦截请求，成功则在响应头中返回新的token更新过期时间

package com.zeus.interceptor;


import cn.hutool.core.date.DateUtil;
import cn.hutool.json.JSON;
import cn.hutool.json.JSONUtil;
import com.zeus.utils.TokenUtil;
import io.jsonwebtoken.Claims;
import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Map;

import static com.zeus.constant.CommonConstants.EFFECTIVE_TIME;

/**
 * 登陆拦截器
 *
 * @author:fusheng
 * @date:2019/1/10
 * @ver:1.0
 **/
public class LoginHandlerIntercepter implements HandlerInterceptor {
    private static final Logger LOG = LoggerFactory.getLogger(LoginHandlerIntercepter.class);

    /**
     * token 校验
     *
     * @param httpServletRequest, httpServletResponse, o
     * @return boolean
     * @methodName preHandle
     * @author fusheng
     * @date 2019/1/3 0003
     */
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {
        Map<String, String[]> mapIn = httpServletRequest.getParameterMap();
        JSON jsonObject = JSONUtil.parseObj(mapIn);
        StringBuffer stringBuffer = httpServletRequest.getRequestURL();

        LOG.info("httpServletRequest ,路径:" + stringBuffer + ",入参:" + JSONUtil.toJsonStr(jsonObject));

        //校验APP的登陆状态，如果token 没有过期
        LOG.info("come in preHandle");
        String oldToken = httpServletRequest.getHeader("token");
        LOG.info("token:" + oldToken);
        /*刷新token，有效期延长至一个月*/
        if (StringUtils.isNotBlank(oldToken)) {
            Claims claims = null;
            try {
                claims = TokenUtil.parseJWT(oldToken);
            } catch (Exception e) {
                e.printStackTrace();
                String str = "{\"code\":801,\"msg\":\"登陆失效,请重新登录\"}";
                dealErrorReturn(httpServletRequest, httpServletResponse, str);
                return false;
            }
            if (claims.getExpiration().getTime() > DateUtil.date().getTime()) {
                String userId = claims.getId();
                try {
                    String newToken = TokenUtil.createJWT(claims.getId(), claims.getIssuer(), claims.getSubject(), EFFECTIVE_TIME);
                    LOG.info("new TOKEN:{}", newToken);
                    httpServletRequest.setAttribute("userId", userId);
                    httpServletResponse.setHeader("token", newToken);
                    LOG.info("flush token success ,{}", oldToken);
                    return true;
                } catch (Exception e) {
                    e.printStackTrace();
                    String str = "{\"code\":801,\"msg\":\"登陆失效,请重新登录\"}";
                    dealErrorReturn(httpServletRequest, httpServletResponse, str);
                    return false;
                }
            }
        }
        String str = "{\"code\":801,\"msg\":\"登陆失效,请重新登录\"}";
        dealErrorReturn(httpServletRequest, httpServletResponse, str);
        return false;
    }

    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {
    }

    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {
    }

    /**
     * 返回错误信息给WEB
     *
     * @param httpServletRequest, httpServletResponse, obj
     * @return void
     * @methodName dealErrorReturn
     * @author fusheng
     * @date 2019/1/3 0003
     */
    public void dealErrorReturn(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object obj) {
        String json = (String) obj;
        PrintWriter writer = null;
        httpServletResponse.setCharacterEncoding("UTF-8");
        httpServletResponse.setContentType("application/json; charset=utf-8");
        try {
            writer = httpServletResponse.getWriter();
            writer.print(json);

        } catch (IOException ex) {
            LOG.error("response error", ex);
        } finally {
            if (writer != null) {
                writer.close();
            }
        }
    }
}

讲完了token ,再讲layui如何存储token,并在每次渲染时添加token到请求头中

form.on('submit(LAY-user-login-submit)', function (obj) {
            //请求登入接口
            admin.req({
                //实际使用请改成服务端真实接口
                url: '/userInfo/login',
                method: 'POST',
                data: obj.field,
                done: function (res) {
                    if (res.code === 0) {
                        //请求成功后，写入 access_token
                        layui.data(setter.tableName, {
                            key: "token",
                            value: res.data.token
                        });
                        //登入成功的提示与跳转
                        layer.msg(res.msg, {
                            offset: '15px',
                            icon: 1,
                            time: 1000
                        }, function () {
                            location.href ="index"

                        });
                    } else {
                        layer.msg(res.msg, {
                            offset: '15px',
                            icon: 1,
                            time: 1000
                        });
                    }
                }
            });
        });

我们将返回的token信息存入layui本地存储的表中，在config.js中会配置表名，一般直接使用layui.setter.tableName 即可，

由于layui的table 是通过js渲染的，我们无法在js中对它进行设置请求头，而且每一个表格都要配置极为麻烦，但layui的数据表格是基于ajax请求的，所以我们选在在layui的module中手动修改table.js使得，每次请求是都会自动携带请求头

a.contentType && 0 == a.contentType.indexOf("application/json") && (d = JSON.stringify(d)), t.ajax({
                type: a.method || "get",
                url: a.url,
                contentType: a.contentType,
                data: d,
                dataType: "json",
                headers: {"token":layui.data(layui.setter.tableName)['token']},
                success: function (t) {
                    if(t.code==801){
                        top.location.href = "index";
                    }else {
                        "function" == typeof a.parseData && (t = a.parseData(t) || t), t[n.statusName] != n.statusCode ? (i.renderForm(), i.layMain.html(&#39;<div class="&#39; + f + &#39;">&#39; + (t[n.msgName] || "返回的数据不符合规范，正确的成功状态码 (" + n.statusName + ") 应为：" + n.statusCode) + "</div>")) : (i.renderData(t, e, t[n.countName]), o(), a.time = (new Date).getTime() - i.startTime + " ms"), i.setColsWidth(), "function" == typeof a.done && a.done(t, e, t[n.countName])
                    }
                },
                error: function (e, t) {
                    i.layMain.html(&#39;<div class="&#39; + f + &#39;">数据接口请求异常：&#39; + t + "</div>"), i.renderForm(), i.setColsWidth()
                },
                complete: function( xhr,data ){
                    layui.data(layui.setter.tableName, {
                        key: "token",
                        value: xhr.getResponseHeader("token")==null?layui.data(layui.setter.tableName)[&#39;token&#39;]:xhr.getResponseHeader("token")
                    })
                }
            })

在table.js中找到这一代码，按上面的配置

headers: {"token":layui.data(layui.setter.tableName)['token']},这里是设置请求头的token,拿到登录成功后存储在表中的layui.data(layui.setter.tableName)['token']， 这样既可携带token很简单

同时我们需要更新token的过期时间，那么就要拿到新的token，并放入表中

  complete: function( xhr,data ){
     layui.data(layui.setter.tableName, {
key: "token",
value: xhr.getResponseHeader("token")==null?layui.data(layui.setter.tableName)['token']:xhr.getResponseHeader("token") })
}

使用ajax的complete方法拿到token,并覆盖表的旧token,如果为空则不覆盖

table讲完，来看看请求，layui中内置了jquery，可以使用var $ = layui,jquery, 来使用内置的ajax,那么我们也需要对ajax进行配置

pe.extend({
        active: 0,
        lastModified: {},
        etag: {},
        ajaxSettings: {
            url: en,
            type: "GET",
            isLocal: Vt.test(tn[1]),
            global: !0,
            processData: !0,
            async: !0,
            headers: {"token":layui.data(layui.setter.tableName)['token']},
            contentType: "application/x-www-form-urlencoded; charset=UTF-8",
            accepts: {
                "*": Zt,
                text: "text/plain",
                html: "text/html",
                xml: "application/xml, text/xml",
                json: "application/json, text/javascript"
            },
            contents: {xml: /\bxml\b/, html: /\bhtml/, json: /\bjson\b/},
            responseFields: {xml: "responseXML", text: "responseText", json: "responseJSON"},
            converters: {"* text": String, "text html": !0, "text json": pe.parseJSON, "text xml": pe.parseXML},
            flatOptions: {url: !0, context: !0}
        },

同样在l你引用的ayui.js或者layui.all.js中找到 ajaxSettings:配置一下即可。

更多layui知识请关注layui使用教程栏目。

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