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('<div class="' + f + '">' + (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('<div class="' + f + '">数据接口请求异常：' + 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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