170810、spring+springmvc+Interceptor+jwt+redis实现sso单点登录

在分布式环境中，如何支持PC、APP（ios、android）等多端的会话共享，这也是所有公司都需要的解决方案，用传统的session方式来解决，我想已经out了，我们是否可以找一个通用的方案，比如用传统cas来实现多系统之间的sso单点登录或使用oauth的第三方登录方案? 今天给大家简单讲解一下使用spring拦截器Interceptor机制、jwt认证方式、redis分布式缓存实现sso单点登录，闲话少说，直接把步骤记录下来分享给大家：

1. 引入jwt的相关jar包，在项目pom.xml中引入：

<dependency>
            <groupId>com.auth0</groupId>
            <artifactId>java-jwt</artifactId>
            <version>2.2.0</version>
</dependency>

2. 拦截器配置：

<mvc:interceptor>
            <mvc:mapping path="${adminPath}/**" />
            <mvc:exclude-mapping path="${adminPath}/rest/login"/>
            <bean class="com.ml.honghu.interceptor.LoginInterceptor" />
</mvc:interceptor>

3. 编写jwt的加密或者解密工具类：

public class JWT {
    private static final String SECRET = "HONGHUJWT1234567890QWERTYUIOPASDFGHJKLZXCVBNM";

    private static final String EXP = "exp";

    private static final String PAYLOAD = "payload";

    //加密
    public static <T> String sign(T object, long maxAge) {
        try {
            final JWTSigner signer = new JWTSigner(SECRET);
            final Map<String, Object> claims = new HashMap<String, Object>();
            ObjectMapper mapper = new ObjectMapper();
            String jsonString = mapper.writeValueAsString(object);
            claims.put(PAYLOAD, jsonString);
            claims.put(EXP, System.currentTimeMillis() + maxAge);
            return signer.sign(claims);
        } catch(Exception e) {
            return null;
        }
    }

    //解密
    public static<T> T unsign(String jwt, Class<T> classT) {
        final JWTVerifier verifier = new JWTVerifier(SECRET);
        try {
            final Map<String,Object> claims= verifier.verify(jwt);
            if (claims.containsKey(EXP) && claims.containsKey(PAYLOAD)) {
                  String json = (String)claims.get(PAYLOAD);
                  ObjectMapper objectMapper = new ObjectMapper();
                  return objectMapper.readValue(json, classT);

            }
            return null;
        } catch (Exception e) {
            return null;
        }
    }
}

PS：这个加密工具类是我从网上找的，如果各位要修改，可以按照自己业务修改即可。

4. 创建Login.java对象，用来进行jwt的加密或者解密：

public class Login implements Serializable{
    /**
     *
     */
    private static final long serialVersionUID = 1899232511233819216L;

    /**
     * 用户id
     */
    private String uid;

    /**
     * 登录用户名
     */
    private String loginName;

    /**
     * 登录密码
     */
    private String password;

    public Login(){
        super();
    }

    public Login(String uid, String loginName, String password){
        this.uid = uid;
        this.loginName = loginName;
        this.password = password;
    }

    public String getUid() {
        return uid;
    }
    public void setUid(String uid) {
        this.uid = uid;
    }
    public String getLoginName() {
        return loginName;
    }
    public void setLoginName(String loginName) {
        this.loginName = loginName;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }

}

5. 定义RedisLogin对象，用来通过uid往redis进行user对象存储：

public class RedisLogin implements Serializable{
    /**
     *
     */
    private static final long serialVersionUID = 8116817810829835862L;

    /**
     * 用户id
     */
    private String uid;

    /**
     * jwt生成的token信息
     */
    private String token;

    /**
     * 登录或刷新应用的时间
     */
    private long refTime;

    public RedisLogin(){

    }

    public RedisLogin(String uid, String token, long refTime){
        this.uid = uid;
        this.token = token;
        this.refTime = refTime;
    }

    public String getUid() {
        return uid;
    }
    public void setUid(String uid) {
        this.uid = uid;
    }
    public String getToken() {
        return token;
    }
    public void setToken(String token) {
        this.token = token;
    }
    public long getRefTime() {
        return refTime;
    }
    public void setRefTime(long refTime) {
        this.refTime = refTime;
    }

}

6. 编写LoginInterceptor.java拦截器

public class LoginInterceptor implements HandlerInterceptor{

    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        PrintWriter writer = null;
        HandlerMethod method = null;
        try {
            method = (HandlerMethod) handler;
        } catch (Exception e) {
            writer = response.getWriter();
            ResponseVO responseVO = ResponseCode.buildEnumResponseVO(ResponseCode.REQUEST_URL_NOT_SERVICE, false);
            responseMessage(response, writer, responseVO);
            return false;
        }
        IsLogin isLogin = method.getMethodAnnotation(IsLogin.class);
        if(null == isLogin){
            return true;
        }

        response.setCharacterEncoding("utf-8");
        String token = request.getHeader("token");
        String uid = request.getHeader("uid");
        //token不存在
        if(StringUtils.isEmpty(token)) {
            writer = response.getWriter();
            ResponseVO responseVO = LoginResponseCode.buildEnumResponseVO(LoginResponseCode.LOGIN_TOKEN_NOT_NULL, false);
            responseMessage(response, writer, responseVO);
            return false;
        }
        if(StringUtils.isEmpty(uid)){
            writer = response.getWriter();
            ResponseVO responseVO = LoginResponseCode.buildEnumResponseVO(LoginResponseCode.USERID_NOT_NULL, false);
            responseMessage(response, writer, responseVO);
            return false;
        }

        Login login = JWT.unsign(token, Login.class);
        //解密token后的loginId与用户传来的loginId判断是否一致
        if(null == login || !StringUtils.equals(login.getUid(), uid)){
            writer = response.getWriter();
            ResponseVO responseVO = LoginResponseCode.buildEnumResponseVO(LoginResponseCode.USERID_NOT_UNAUTHORIZED, false);
            responseMessage(response, writer, responseVO);
            return false;
        }

        //验证登录时间
        RedisLogin redisLogin = (RedisLogin)JedisUtils.getObject(uid);
        if(null == redisLogin){
            writer = response.getWriter();
            ResponseVO responseVO = LoginResponseCode.buildEnumResponseVO(LoginResponseCode.RESPONSE_CODE_UNLOGIN_ERROR, false);
            responseMessage(response, writer, responseVO);
            return false;
        }

        if(!StringUtils.equals(token, redisLogin.getToken())){
            writer = response.getWriter();
            ResponseVO responseVO = LoginResponseCode.buildEnumResponseVO(LoginResponseCode.USERID_NOT_UNAUTHORIZED, false);
            responseMessage(response, writer, responseVO);
            return false;
        }
        //系统时间>有效期（说明已经超过有效期）
        if (System.currentTimeMillis() > redisLogin.getRefTime()) {
            writer = response.getWriter();
            ResponseVO responseVO = LoginResponseCode.buildEnumResponseVO(LoginResponseCode.LOGIN_TIME_EXP, false);
            responseMessage(response, writer, responseVO);
            return false;
        }

        //重新刷新有效期
        redisLogin = new RedisLogin(uid, token, System.currentTimeMillis() + 60L* 1000L* 30L);
        JedisUtils.setObject(uid , redisLogin, 360000000);
        return true;
    }

    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
            ModelAndView modelAndView) throws Exception {

    }

    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
            throws Exception {

    }

    private void responseMessage(HttpServletResponse response, PrintWriter out, ResponseVO responseVO) {
        response.setContentType("application/json; charset=utf-8");
        JSONObject result = new JSONObject();
        result.put("result", responseVO);
        out.print(result);
        out.flush();
        out.close();
    }

}

7. 定义异常的LoginResponseCode

public enum LoginResponseCode {
    USERID_NOT_NULL(3001,"用户id不能为空."),
    LOGIN_TOKEN_NOT_NULL(3002,"登录token不能为空."),
    USERID_NOT_UNAUTHORIZED(3003, "用户token或ID验证不通过"),
    RESPONSE_CODE_UNLOGIN_ERROR(421, "未登录异常"),
    LOGIN_TIME_EXP(3004, "登录时间超长，请重新登录");

    // 成员变量
    private int code; //状态码
    private String message; //返回消息

    // 构造方法
    private LoginResponseCode(int code,String message) {
        this.code = code;
        this.message = message;
    }
    public int getCode() {
        return code;
    }
    public void setCode(int code) {
        this.code = code;
    }
    public String getMessage() {
        return message;
    }
    public void setMessage(String message) {
        this.message = message;
    }  

    public static ResponseVO buildEnumResponseVO(LoginResponseCode responseCode, Object data) {
        return new ResponseVO(responseCode.getCode(),responseCode.getMessage(),data);
    }

    public static Map<String, Object> buildReturnMap(LoginResponseCode responseCode, Object data) {
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("code", responseCode.getCode());
        map.put("message", responseCode.getMessage());
        map.put("data", data);
        return map;
    }
}

8. 编写统一sso单点登录接口：

@RequestMapping(value = "/login", method = RequestMethod.POST)
    public Map<String, Object> login(@RequestBody JSONObject json){
        String loginName = json.optString("loginName");
        String password = json.optString("password");
        //校验用户名不能为空
        if(StringUtils.isEmpty(loginName)){
            return MemberResponseCode.buildReturnMap(MemberResponseCode.RESPONSE_CODE_USER_NAME_IS_NOT_EMPTY, null);
        }
        //校验用户密码不能为空
        if(StringUtils.isEmpty(password)){
            return MemberResponseCode.buildReturnMap(MemberResponseCode.RESPONSE_CODE_PWD_CAN_NOT_BE_EMPTY, null);
        }
        //根据用户名查询数据库用户信息
        User user = systemService.getBaseUserByLoginName(loginName);
        //用户名或密码不正确
        if(null == user){
            return MemberResponseCode.buildReturnMap(MemberResponseCode.RESPONSE_CODE_USER_VALIDATE_NO_SUCCESS, false);
        }
        boolean isValidate = systemService.validatePassword(password, user.getPassword());
        if(!isValidate){
            return MemberResponseCode.buildReturnMap(MemberResponseCode.RESPONSE_CODE_USER_VALIDATE_NO_SUCCESS, false);
        }
        if(isValidate){
            //HttpSession session =request.getSession(false);
            Login login = new Login(user.getId(), user.getLoginName(), user.getPassword());
             //给用户jwt加密生成token
            String token = JWT.sign(login, 60L* 1000L* 30L);
            Map<String,Object> result =new HashMap<String,Object>();
            result.put("loginToken", token);
            result.put("userId", user.getId());
            result.put("user", user);

            //保存用户信息到session
            //session.setAttribute(user.getId() + "@@" + token, user);
            //重建用户信息
            this.rebuildLoginUser(user.getId(), token);
            return ResponseCode.buildReturnMap(ResponseCode.RESPONSE_CODE_LOGIN_SUCCESS, result);
        }

        return ResponseCode.buildReturnMap(ResponseCode.USER_LOGIN_PWD_ERROR, false);
    }

9. 测试sso单点登录：

返回结果集：

{
  "message": "用户登录成功",
  "data": {
    "loginToken": "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJleHAiOjE1MDkzODA1OTU0NTksInBheWxvYWQiOiJ7XCJ1aWRcIjpcIjExXCIsXCJsb2dpbk5hbWVcIjpcImFkbWluXCIsXCJwYXNzd29yZFwiOlwiZjU0NGQxM2QyY2EwNDU5ZGQ0ZTU1NzVjNmZkYWIzMzM0MzE1MWFlZjgwYmE5ZTNiN2U1ZjM2MzJcIn0ifQ.56L60WtxHXSu9vNs6XsWy5zbmc3kP_IWG1YpReK50DM",
    "userId": "11",
    "user": {
      "QQ":"2147775633",
      "id": "11",
      "isNewRecord": false,
      "remarks": "",
      "createDate": "2017-08-08 08:08:08",
      "updateDate": "2017-10-29 11:23:50",
      "loginName": "admin",
      "no": "00012",
      "name": "admin",
      "email": "2147775633@qq.com",
      "phone": "400000000",
      "mobile": "13888888888",
      "userType": "",
      "loginIp": "0:0:0:0:0:0:0:1",
      "loginDate": "2017-10-30 10:48:06",
      "loginFlag": "1",
      "photo": "",
      "idCard": "420888888888888888",
      "oldLoginIp": "0:0:0:0:0:0:0:1",
      "oldLoginDate": "2017-10-30 10:48:06",
      "roleNames": "",
      "admin": false
    }
  },
  "code": 200
}

原文地址：http://2147775633.iteye.com/blog/2398104