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('<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。
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