layui登陸後token問題

layui是一個很是簡單且實用的後臺管理系統搭建框架，裏面的插件豐富使用簡單，只須要在原有基礎上進行修改便可，可是在數據處理方面略顯薄弱，內置的jquery在實際過程當中略顯不足，如果能添加內置的mvc模式框架那就更好了

     先介紹layui在登陸這一塊的使用，

       登陸問題主要是在token的存儲調用上，先貼出後臺的建立token以及攔截器的代碼

 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 ，能夠自定義祕鑰，並存儲登陸信息

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);

    /**
     * 建立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) {
         //獲得claims類
            claims = TokenUtil.parseJWT(token);
            cn.hutool.json.JSONObject jsonObject = JSONUtil.parseObj(claims.getSubject());
            contact = jsonObject.get("user", Contact.class);
        }
        return contact;
    }

claims 中是解密後的token類，存儲token中的所有信息

        //解密token
          claims = TokenUtil.parseJWT(token);
        //獲得用戶的類型
            String issuer = claims.getIssuer();
        //獲得登陸的時間
            Date issuedAt = claims.getIssuedAt();
         //獲得設置的登陸id
            String id = claims.getId();
    //claims.getExpiration().getTime() > DateUtil.date().getTime() ,判斷tokern是否過時
        //獲得存入token的對象
          cn.hutool.json.JSONObject jsonObject = JSONUtil.parseObj(claims.getSubject());
 Contact contact = jsonObject.get("user", Contact.class);

   建立好的token會在頁面中放置到請求頭中，後臺經過來攔截器來判斷是否過時，若過時則攔截請求，成功則在響應頭中返回新的token更新過時時間

     

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;

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

    /**
     * token 校驗
     *
     * @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 ,路徑:" + stringBuffer + ",入參:" + JSONUtil.toJsonStr(jsonObject));

        //校驗APP的登錄狀態，若是token 沒有過時
        LOG.info("come in preHandle");
        String oldToken = httpServletRequest.getHeader("token");
        LOG.info("token:" + oldToken);
        /*刷新token，有效期延長至一個月*/
        if (StringUtils.isNotBlank(oldToken)) {
            Claims claims = null;
            try {
                claims = TokenUtil.parseJWT(oldToken);
            } catch (Exception e) {
                e.printStackTrace();
                String str = "{\"code\":801,\"msg\":\"登錄失效,請從新登陸\"}";
                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\":\"登錄失效,請從新登陸\"}";
                    dealErrorReturn(httpServletRequest, httpServletResponse, str);
                    return false;
                }
            }
        }
        String str = "{\"code\":801,\"msg\":\"登錄失效,請從新登陸\"}";
        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 {
    }

    /**
     * 返回錯誤信息給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();
            }
        }
    }
}

      講完了token ,再講layui如何存儲token,並在每次渲染時添加token到請求頭中

 form.on('submit(LAY-user-login-submit)', function (obj) {
            //請求登入接口
            admin.req({
                //實際使用請改爲服務端真實接口
                url: '/userInfo/login',
                method: 'POST',
                data: obj.field,
                done: function (res) {
                    if (res.code === 0) {
                        //請求成功後，寫入 access_token
                        layui.data(setter.tableName, {
                            key: "token",
                            value: res.data.token
                        });
                        //登入成功的提示與跳轉
                        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
                        });
                    }
                }
            });
        });

       咱們將返回的token信息存入layui本地存儲的表中，在config.js中會配置表名，通常直接使用layui.setter.tableName 便可，

    因爲layui的table 是經過js渲染的，咱們沒法在js中對它進行設置請求頭，並且每個表格都要配置極爲麻煩，但layui的數據表格是基於ajax請求的，因此咱們選在在layui的module中手動修改table.js使得，每次請求是都會自動攜帶請求頭

      

  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('<div class="' + f + '">' + (t[n.msgName] || "返回的數據不符合規範，正確的成功狀態碼 (" + n.statusName + ") 應爲：" + 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('<div class="' + f + '">數據接口請求異常：' + 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)['token']:xhr.getResponseHeader("token")
                    })
                }
            })

      在table.js中找到這一代碼，按上面的配置

     headers: {"token":layui.data(layui.setter.tableName)['token']},這裏是設置請求頭的token,拿到登陸成功後存儲在表中的layui.data(layui.setter.tableName)['token']， 這樣既可攜帶token很簡單

    同時咱們須要更新token的過時時間，那麼就要拿到新的token，並放入表中

  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,並覆蓋表的舊token,若是爲空則不覆蓋     

            table講完，來看看請求，layui中內置了jquery，可使用var $ = layui,jquery, 來使用內置的ajax,那麼咱們也須要對ajax進行配置

       

  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}
        },

     一樣在l你引用的ayui.js或者layui.all.js中找到 ajaxSettings:配置一下便可

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