一、什么是单点登陆

单点登录（Single Sign On），简称为 SSO，是目前比较流行的企业业务整合的解决方案之一。SSO的定义是在多个应用系统中，用户只需要登录一次就可以访问所有相互信任的应用系统

二、简单的运行机制

单点登录的机制其实是比较简单的，用一个现实中的例子做比较。某公园内部有许多独立的景点，游客可以在各个景点门口单独买票。

对于需要游玩所有的景点的游客，这种买票方式很不方便，需要在每个景点门口排队买票，钱包拿 进拿出的，容易丢失，很不安全。

于是绝大多数游客选择在大门口买一张通票（也叫套票），就可以玩遍所有的景点而不需要重新再买票。他们只需要在每个景点门 口出示一下刚才买的套票就能够被允许进入每个独立的景点。

单点登录的机制也一样，如下图所示，

用户认证：这一环节主要是用户向认证服务器发起认证请求，认证服务器给用户返回一个成功的令牌token，主要在认证服务器中完成，即图中的认证系统，注意认证系统只能有一个。

身份校验：这一环节是用户携带token去访问其他服务器时，在其他服务器中要对token的真伪进行检验，主要在资源服务器中完成，即图中的应用系统2 3

三、JWT介绍

概念说明

从分布式认证流程中，我们不难发现，这中间起最关键作用的就是token，token的安全与否，直接关系到系统的健壮性，这里我们选择使用JWT来实现token的生成和校验。

JWT，全称JSON Web Token，官网地址https://jwt.io，是一款出色的分布式身份校验方案。可以生成token，也可以解析检验token。

JWT生成的token由三部分组成：

• 头部：主要设置一些规范信息，签名部分的编码格式就在头部中声明。
• 载荷：token中存放有效信息的部分，比如用户名，用户角色，过期时间等，但是不要放密码，会泄露！
• 签名：将头部与载荷分别采用base64编码后，用“.”相连，再加入盐，最后使用头部声明的编码类型进行编码，就得到了签名。

JWT生成token的安全性分析

从JWT生成的token组成上来看，要想避免token被伪造，主要就得看签名部分了，而签名部分又有三部分组成，其中头部和载荷的base64编码，几乎是透明的，毫无安全性可言，那么最终守护token安全的重担就落在了加入的盐上面了！

试想：如果生成token所用的盐与解析token时加入的盐是一样的。岂不是类似于中国人民银行把人民币防伪技术公开了？大家可以用这个盐来解析token，就能用来伪造token。这时，我们就需要对盐采用非对称加密的方式进行加密，以达到生成token与校验token方所用的盐不一致的安全效果！

非对称加密RSA介绍

基本原理：同时生成两把密钥：私钥和公钥，私钥隐秘保存，公钥可以下发给信任客户端

• 私钥加密，持有私钥或公钥才可以解密
• 公钥加密，持有私钥才可解密

优点：安全，难以破解

缺点：算法比较耗时，为了安全，可以接受

历史：三位数学家Rivest、Shamir 和 Adleman 设计了一种算法，可以实现非对称加密。这种算法用他们三个人的名字缩写：RSA。

四、SpringSecurity整合JWT

1.认证思路分析

SpringSecurity主要是通过过滤器来实现功能的！我们要找到SpringSecurity实现认证和校验身份的过滤器！

回顾集中式认证流程

用户认证：使用
UsernamePasswordAuthenticationFilter过滤器中attemptAuthentication方法实现认证功能，该过滤器父类中successfulAuthentication方法实现认证成功后的操作。

身份校验：使用BasicAuthenticationFilter过滤器中doFilterInternal方法验证是否登录，以决定能否进入后续过滤器。

分析分布式认证流程

用户认证：

由于分布式项目，多数是前后端分离的架构设计，我们要满足可以接受异步post的认证请求参数，需要修改
UsernamePasswordAuthenticationFilter过滤器中attemptAuthentication方法，让其能够接收请求体。

另外，默认successfulAuthentication方法在认证通过后，是把用户信息直接放入session就完事了，现在我们需要修改这个方法，在认证通过后生成token并返回给用户。

身份校验：

原来BasicAuthenticationFilter过滤器中doFilterInternal方法校验用户是否登录，就是看session中是否有用户信息，我们要修改为，验证用户携带的token是否合法，并解析出用户信息，交给SpringSecurity，以便于后续的授权功能可以正常使用。

2.具体实现

为了演示单点登录的效果，我们设计如下项目结构

2.1父工程创建

因为本案例需要创建多个系统，所以我们使用maven聚合工程来实现，首先创建一个父工程，导入springboot的父依赖即可

<parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.1.3.RELEASE</version><relativePath/></parent>

2.2公共工程创建

然后创建一个common工程，其他工程依赖此系统

导入JWT相关的依赖

<dependencies><dependency><groupId>io.jsonwebtoken</groupId><artifactId>jjwt-api</artifactId><version>0.10.7</version></dependency><dependency><groupId>io.jsonwebtoken</groupId><artifactId>jjwt-impl</artifactId><version>0.10.7</version><scope>runtime</scope></dependency><dependency><groupId>io.jsonwebtoken</groupId><artifactId>jjwt-jackson</artifactId><version>0.10.7</version><scope>runtime</scope></dependency><!--jackson包--><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.9.9</version></dependency><!--日志包--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-logging</artifactId></dependency><dependency><groupId>joda-time</groupId><artifactId>joda-time</artifactId></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId></dependency></dependencies>

创建相关的工具类

Payload

@Datapublic class Payload <T>{private String id;private T userInfo;private Date expiration;}

JsonUtils

public classJsonUtils{public static final ObjectMapper mapper = new ObjectMapper;private static final Logger logger = LoggerFactory.getLogger(JsonUtils.class);public static String toString(Object obj) {if (obj == ) {return ;}if (obj.getClass == String.class) {return (String) obj;}try {return mapper.writeValueAsString(obj);} catch (JsonProcessingException e) {logger.error("json序列化出错：" + obj, e);return ;}}public static <T> T toBean(String json, Class<T> tClass) {try {return mapper.readValue(json, tClass);} catch (IOException e) {logger.error("json解析出错：" + json, e);return ;}}public static <E> List<E> toList(String json, Class<E> eClass) {try {return mapper.readValue(json, mapper.getTypeFactory.constructCollectionType(List.class, eClass));} catch (IOException e) {logger.error("json解析出错：" + json, e);return ;}}public static <K, V> Map<K, V> toMap(String json, Class<K> kClass, Class<V> vClass) {try {return mapper.readValue(json, mapper.getTypeFactory.constructMapType(Map.class, kClass, vClass));} catch (IOException e) {logger.error("json解析出错：" + json, e);return ;}}public static <T> T nativeRead(String json, TypeReference<T> type) {try {return mapper.readValue(json, type);} catch (IOException e) {logger.error("json解析出错：" + json, e);return ;}}}

JwtUtils

public classJwtUtils{private static final String JWT_PAYLOAD_USER_KEY = "user";/*** 私钥加密token** @param userInfo 载荷中的数据* @param privateKey 私钥* @param expire 过期时间，单位分钟* @return JWT*/public static String generateTokenExpireInMinutes(Object userInfo, PrivateKey privateKey, int expire) {return Jwts.builder.claim(JWT_PAYLOAD_USER_KEY, JsonUtils.toString(userInfo)).setId(createJTI).setExpiration(DateTime.now.plusMinutes(expire).toDate).signWith(privateKey, SignatureAlgorithm.RS256).compact;}/*** 私钥加密token** @param userInfo 载荷中的数据* @param privateKey 私钥* @param expire 过期时间，单位秒* @return JWT*/public static String generateTokenExpireInSeconds(Object userInfo, PrivateKey privateKey, int expire) {return Jwts.builder.claim(JWT_PAYLOAD_USER_KEY, JsonUtils.toString(userInfo)).setId(createJTI).setExpiration(DateTime.now.plusSeconds(expire).toDate).signWith(privateKey, SignatureAlgorithm.RS256).compact;}/*** 公钥解析token** @param token 用户请求中的token* @param publicKey 公钥* @return Jws<Claims>*/private static Jws<Claims> parserToken(String token, PublicKey publicKey) {return Jwts.parser.setSigningKey(publicKey).parseClaimsJws(token);}private static String createJTI {return new String(Base64.getEncoder.encode(UUID.randomUUID.toString.getBytes));}/*** 获取token中的用户信息** @param token 用户请求中的令牌* @param publicKey 公钥* @return 用户信息*/public static <T> Payload<T> getInfoFromToken(String token, PublicKey publicKey, Class<T> userType) {Jws<Claims> claimsJws = parserToken(token, publicKey);Claims body = claimsJws.getBody;Payload<T> claims = new Payload<>;claims.setId(body.getId);claims.setUserInfo(JsonUtils.toBean(body.get(JWT_PAYLOAD_USER_KEY).toString, userType));claims.setExpiration(body.getExpiration);return claims;}/*** 获取token中的载荷信息** @param token 用户请求中的令牌* @param publicKey 公钥* @return 用户信息*/public static <T> Payload<T> getInfoFromToken(String token, PublicKey publicKey) {Jws<Claims> claimsJws = parserToken(token, publicKey);Claims body = claimsJws.getBody;Payload<T> claims = new Payload<>;claims.setId(body.getId);claims.setExpiration(body.getExpiration);return claims;}}

RsaUtils

public classRsaUtils{private static final int DEFAULT_KEY_SIZE = 2048;/*** 从文件中读取公钥** @param filename 公钥保存路径，相对于classpath* @return 公钥对象* @throws Exception*/public static PublicKey getPublicKey(String filename) throws Exception {byte bytes = readFile(filename);return getPublicKey(bytes);}/*** 从文件中读取密钥** @param filename 私钥保存路径，相对于classpath* @return 私钥对象* @throws Exception*/public static PrivateKey getPrivateKey(String filename) throws Exception {byte bytes = readFile(filename);return getPrivateKey(bytes);}/*** 获取公钥** @param bytes 公钥的字节形式* @return* @throws Exception*/private static PublicKey getPublicKey(byte[] bytes) throws Exception {bytes = Base64.getDecoder.decode(bytes);X509EncodedKeySpec spec = new X509EncodedKeySpec(bytes);KeyFactory factory = KeyFactory.getInstance("RSA");return factory.generatePublic(spec);}/*** 获取密钥** @param bytes 私钥的字节形式* @return* @throws Exception*/private static PrivateKey getPrivateKey(byte[] bytes) throws NoSuchAlgorithmException, InvalidKeySpecException {bytes = Base64.getDecoder.decode(bytes);PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(bytes);KeyFactory factory = KeyFactory.getInstance("RSA");return factory.generatePrivate(spec);}/*** 根据密文，生存rsa公钥和私钥,并写入指定文件** @param publicKeyFilename 公钥文件路径* @param privateKeyFilename 私钥文件路径* @param secret 生成密钥的密文*/public static void generateKey(String publicKeyFilename, String privateKeyFilename, String secret, int keySize) throws Exception {KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");SecureRandom secureRandom = new SecureRandom(secret.getBytes);keyPairGenerator.initialize(Math.max(keySize, DEFAULT_KEY_SIZE), secureRandom);KeyPair keyPair = keyPairGenerator.genKeyPair;// 获取公钥并写出byte publicKeyBytes = keyPair.getPublic.getEncoded;publicKeyBytes = Base64.getEncoder.encode(publicKeyBytes);writeFile(publicKeyFilename, publicKeyBytes);// 获取私钥并写出byte privateKeyBytes = keyPair.getPrivate.getEncoded;privateKeyBytes = Base64.getEncoder.encode(privateKeyBytes);writeFile(privateKeyFilename, privateKeyBytes);}private static byte readFile(String fileName) throws Exception {return Files.readAllBytes(new File(fileName).toPath);}private static void writeFile(String destPath, byte[] bytes) throws IOException {File dest = new File(destPath);if (!dest.exists) {dest.createNewFile;}Files.write(dest.toPath, bytes);}}

在通用子模块中编写测试类生成rsa公钥和私钥

public classJwtTest{private String privateKey = "c:/tools/auth_key/id_key_rsa";private String publicKey = "c:/tools/auth_key/id_key_rsa.pub";@Testpublic void test1 throws Exception{RsaUtils.generateKey(publicKey,privateKey,"dpb",1024);}}

2.3认证系统创建

接下来我们创建我们的认证服务。

导入相关的依赖

<dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-security</artifactId></dependency><dependency><artifactId>security-jwt-common</artifactId><groupId>com.dpb</groupId><version>1.0-SNAPSHOT</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.47</version></dependency><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.1.0</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.10</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-configuration-processor</artifactId><optional>true</optional></dependency></dependencies>

创建配置文件

spring:datasource:driver-class-name: com.mysql.jdbc.Driverurl: jdbc:mysql://localhost:3306/srmusername: rootpassword: 123456type: com.alibaba.druid.pool.DruidDataSourcemybatis:type-aliases-package: com.dpb.domainmapper-locations: classpath:mapper/*.xmllogging:level:com.dpb: debugrsa:key:pubKeyFile: c:toolsauth_keyid_key_rsa.pubpriKeyFile: c:toolsauth_keyid_key_rsa

提供公钥私钥的配置类

@Data@ConfigurationProperties(prefix = "rsa.key")publicclassRsaKeyProperties{private String pubKeyFile;private String priKeyFile;private PublicKey publicKey;private PrivateKey privateKey;/*** 系统启动的时候触发* @throws Exception*/@PostConstructpublic void createRsaKey throws Exception {publicKey = RsaUtils.getPublicKey(pubKeyFile);privateKey = RsaUtils.getPrivateKey(priKeyFile);}}

创建启动类

@SpringBootApplication@MapperScan("com.dpb.mapper")@EnableConfigurationProperties(RsaKeyProperties.class)public class App {public static void main(String[] args) {SpringApplication.run(App.class,args);}}

完成数据认证的逻辑

pojo

@Datapublic class RolePojo implements GrantedAuthority {private Integer id;private String roleName;private String roleDesc;@JsonIgnore@Overridepublic String getAuthority {return roleName;}}

@DatapublicclassUserPojoimplementsUserDetails{private Integer id;private String username;private String password;private Integer status;private List<RolePojo> roles;@JsonIgnore@Overridepublic Collection<? extends GrantedAuthority> getAuthorities {List<SimpleGrantedAuthority> auth = new ArrayList<>;auth.add(new SimpleGrantedAuthority("ADMIN"));return auth;}@Overridepublic String getPassword {return this.password;}@Overridepublic String getUsername {return this.username;}@JsonIgnore@OverridepublicbooleanisAccountNonExpired {return true;}@JsonIgnore@OverridepublicbooleanisAccountNonLocked {return true;}@JsonIgnore@OverridepublicbooleanisCredentialsNonExpired {return true;}@JsonIgnore@OverridepublicbooleanisEnabled {return true;}}

Mapper接口

public interface UserMapper {public UserPojo queryByUserName(@Param("userName") String userName);}

Mapper映射文件

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="com.dpb.mapper.UserMapper"><select id="queryByUserName" resultType="UserPojo">select * from t_user where username = #{userName}</select></mapper>

Service

public interfaceUserServiceextendsUserDetailsService{}

@Service@TransactionalpublicclassUserServiceImplimplementsUserService{@Autowiredprivate UserMapper mapper;@Overridepublic UserDetails loadUserByUsername(String s) throws UsernameNotFoundException {UserPojo user = mapper.queryByUserName(s);return user;}}

自定义认证过滤器

public class TokenLoginFilter extends UsernamePasswordAuthenticationFilter {private AuthenticationManager authenticationManager;private RsaKeyProperties prop;public TokenLoginFilter(AuthenticationManager authenticationManager, RsaKeyProperties prop) {this.authenticationManager = authenticationManager;this.prop = prop;}public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response) throws AuthenticationException {try {UserPojo sysUser = new ObjectMapper.readValue(request.getInputStream, UserPojo.class);UsernamePasswordAuthenticationToken authRequest = new UsernamePasswordAuthenticationToken(sysUser.getUsername, sysUser.getPassword);return authenticationManager.authenticate(authRequest);}catch (Exception e){try {response.setContentType("application/json;charset=utf-8");response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);PrintWriter out = response.getWriter;Map resultMap = new HashMap;resultMap.put("code", HttpServletResponse.SC_UNAUTHORIZED);resultMap.put("msg", "用户名或密码错误！");out.write(new ObjectMapper.writeValueAsString(resultMap));out.flush;out.close;}catch (Exception outEx){outEx.printStackTrace;}throw new RuntimeException(e);}}public void successfulAuthentication(HttpServletRequest request, HttpServletResponse response, FilterChain chain, Authentication authResult) throws IOException, ServletException {UserPojo user = new UserPojo;user.setUsername(authResult.getName);user.setRoles((List<RolePojo>)authResult.getAuthorities);String token = JwtUtils.generateTokenExpireInMinutes(user, prop.getPrivateKey, 24 * 60);response.addHeader("Authorization", "Bearer "+token);try {response.setContentType("application/json;charset=utf-8");response.setStatus(HttpServletResponse.SC_OK);PrintWriter out = response.getWriter;Map resultMap = new HashMap;resultMap.put("code", HttpServletResponse.SC_OK);resultMap.put("msg", "认证通过！");out.write(new ObjectMapper.writeValueAsString(resultMap));out.flush;out.close;}catch (Exception outEx){outEx.printStackTrace;}}}

自定义校验token的过滤器

public class TokenVerifyFilter extends BasicAuthenticationFilter {private RsaKeyProperties prop;public TokenVerifyFilter(AuthenticationManager authenticationManager, RsaKeyProperties prop) {super(authenticationManager);this.prop = prop;}public void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException {String header = request.getHeader("Authorization");if (header == || !header.startsWith("Bearer ")) {//如果携带错误的token，则给用户提示请登录！chain.doFilter(request, response);response.setContentType("application/json;charset=utf-8");response.setStatus(HttpServletResponse.SC_FORBIDDEN);PrintWriter out = response.getWriter;Map resultMap = new HashMap;resultMap.put("code", HttpServletResponse.SC_FORBIDDEN);resultMap.put("msg", "请登录！");out.write(new ObjectMapper.writeValueAsString(resultMap));out.flush;out.close;} else {//如果携带了正确格式的token要先得到tokenString token = header.replace("Bearer ", "");//验证tken是否正确Payload<UserPojo> payload = JwtUtils.getInfoFromToken(token, prop.getPublicKey, UserPojo.class);UserPojo user = payload.getUserInfo;if(user!=){UsernamePasswordAuthenticationToken authResult = new UsernamePasswordAuthenticationToken(user.getUsername, , user.getAuthorities);SecurityContextHolder.getContext.setAuthentication(authResult);chain.doFilter(request, response);}}}}

编写SpringSecurity的配置类

@Configuration@EnableWebSecurity@EnableGlobalMethodSecurity(securedEnabled=true)public class WebSecurityConfig extends WebSecurityConfigurerAdapter {@Autowiredprivate UserService userService;@Autowiredprivate RsaKeyProperties prop;@Beanpublic BCryptPasswordEncoder passwordEncoder{return new BCryptPasswordEncoder;}//指定认证对象的来源public void configure(AuthenticationManagerBuilder auth) throws Exception {auth.userDetailsService(userService).passwordEncoder(passwordEncoder);}//SpringSecurity配置信息public void configure(HttpSecurity http) throws Exception {http.csrf.disable.authorizeRequests.antMatchers("/user/query").hasAnyRole("ADMIN").anyRequest.authenticated.and.addFilter(new TokenLoginFilter(super.authenticationManager, prop)).addFilter(new TokenVerifyFilter(super.authenticationManager, prop)).sessionManagement.sessionCreationPolicy(SessionCreationPolicy.STATELESS);}}

启动服务测试

启动服务

通过Postman来访问测试

根据token信息我们访问其他资源

2.4资源系统创建

说明

资源服务可以有很多个，这里只拿产品服务为例，记住，资源服务中只能通过公钥验证认证。不能签发token！创建产品服务并导入jar包根据实际业务导包即可，咱们就暂时和认证服务一样了。

接下来我们再创建一个资源服务

导入相关的依赖

<dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-security</artifactId></dependency><dependency><artifactId>security-jwt-common</artifactId><groupId>com.dpb</groupId><version>1.0-SNAPSHOT</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.47</version></dependency><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.1.0</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.10</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-configuration-processor</artifactId><optional>true</optional></dependency></dependencies>

编写产品服务配置文件

切记这里只能有公钥地址！

server:port: 9002spring:datasource:driver-class-name: com.mysql.jdbc.Driverurl: jdbc:mysql://localhost:3306/srmusername: rootpassword: 123456type: com.alibaba.druid.pool.DruidDataSourcemybatis:type-aliases-package: com.dpb.domainmapper-locations: classpath:mapper/*.xmllogging:level:com.dpb: debugrsa:key:pubKeyFile: c:toolsauth_keyid_key_rsa.pub

编写读取公钥的配置类

@Data@ConfigurationProperties(prefix = "rsa.key")publicclassRsaKeyProperties{private String pubKeyFile;private PublicKey publicKey;/*** 系统启动的时候触发* @throws Exception*/@PostConstructpublic void createRsaKey throws Exception {publicKey = RsaUtils.getPublicKey(pubKeyFile);}}

编写启动类

@SpringBootApplication@MapperScan("com.dpb.mapper")@EnableConfigurationProperties(RsaKeyProperties.class)public class App {public static void main(String[] args) {SpringApplication.run(App.class,args);}}

复制认证服务中，用户对象，角色对象和校验认证的接口

复制认证服务中的相关内容即可

复制认证服务中SpringSecurity配置类做修改

@Configuration@EnableWebSecurity@EnableGlobalMethodSecurity(securedEnabled=true)public class WebSecurityConfig extends WebSecurityConfigurerAdapter {@Autowiredprivate UserService userService;@Autowiredprivate RsaKeyProperties prop;@Beanpublic BCryptPasswordEncoder passwordEncoder{return new BCryptPasswordEncoder;}//指定认证对象的来源public void configure(AuthenticationManagerBuilder auth) throws Exception {auth.userDetailsService(userService).passwordEncoder(passwordEncoder);}//SpringSecurity配置信息public void configure(HttpSecurity http) throws Exception {http.csrf.disable.authorizeRequests//.antMatchers("/user/query").hasAnyRole("USER").anyRequest.authenticated.and.addFilter(new TokenVerifyFilter(super.authenticationManager, prop))// 禁用掉session.sessionManagement.sessionCreationPolicy(SessionCreationPolicy.STATELESS);}}

去掉“增加自定义认证过滤器”即可！

编写产品处理器

@RestController@RequestMapping("/user")publicclassUserController{@RequestMapping("/query")public String query{return "success";}@RequestMapping("/update")public String update{return "update";}}

测试