Java中基于Shiro,JWT实现微信小程序登录完整例子及实现过程

小程序官方流程图如下，官方地址 : https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/login.html :

本文是对接微信小程序自定义登录的一个完整例子实现 ，技术栈为 : SpringBoot+Shiro+JWT+JPA+Redis。

如果对该例子比较感兴趣或者觉得言语表达比较啰嗦，可查看完整的项目地址 : https://github.com/EalenXie/shiro-jwt-applet

主要实现 : 实现了小程序的自定义登陆，将自定义登陆态token返回给小程序作为登陆凭证。用户的信息保存在数据库中，登陆态token缓存在redis中。

效果如下 :

1 . 首先从我们的小程序端调用wx.login() ，获取临时凭证code :

2 . 模拟使用该code，进行小程序的登陆获取自定义登陆态 token，用postman进行测试 :

3 . 调用我们需要认证的接口，并携带该token进行鉴权，获取到返回信息  :

前方高能，本例代码说明较多， 以下是主要的搭建流程 :

1 . 首先新建maven项目 shiro-jwt-applet ，pom依赖 ，主要是shiro和jwt的依赖，和SpringBoot的一些基础依赖。

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>name.ealen</groupId>
<artifactId>shiro-jwt-applet</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>shiro-wx-jwt</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.6.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.apache.shiro</groupId>
<artifactId>shiro-spring</artifactId>
<version>1.4.0</version>
</dependency>
<dependency>
<groupId>com.auth0</groupId>
<artifactId>java-jwt</artifactId>
<version>3.4.1</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.47</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

2 . 配置你的application.yml ，主要是配置你的小程序appid和secret，还有你的数据库和redis

## 请自行修改下面信息
spring:
application:
name: shiro-jwt-applet
jpa:
hibernate:
ddl-auto: create # 请自行修改 请自行修改 请自行修改
# datasource本地配置
datasource:
url: jdbc:mysql://localhost:3306/yourdatabase
username: yourname
password: yourpass
driver-class-name: com.mysql.jdbc.Driver
# redis本地配置 请自行配置
redis:
database: 0
host: localhost
port: 6379
# 微信小程序配置 appid /appsecret
wx:
applet:
appid: yourappid
appsecret: yourappsecret

3 . 定义我们存储的微信小程序登陆的实体信息 WxAccount  : 

package name.ealen.domain.entity;
import org.springframework.format.annotation.DateTimeFormat;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import java.util.Date;
/**
* Created by EalenXie on 2018/11/26 10:26.
* 实体 属性描述 这里只是简单示例，你可以自定义相关用户信息
*/
@Entity
@Table
public class WxAccount {
@Id
@GeneratedValue
private Integer id;
private String wxOpenid;
private String sessionKey;
@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
private Date lastTime;
/**
* 省略getter/setter
*/
}

　　和一个简单的dao 访问数据库 WxAccountRepository :

package name.ealen.domain.repository;
import name.ealen.domain.entity.WxAccount;
import org.springframework.data.jpa.repository.JpaRepository;
/**
* Created by EalenXie on 2018/11/26 10:32.
*/
public interface WxAccountRepository extends JpaRepository<WxAccount, Integer> {
/**
* 根据OpenId查询用户信息
*/
WxAccount findByWxOpenid(String wxOpenId);
}

4 . 定义我们应用的服务说明 WxAppletService :

package name.ealen.application;
import name.ealen.interfaces.dto.Token;
/**
* Created by EalenXie on 2018/11/26 10:40.
* 微信小程序自定义登陆 服务说明
*/
public interface WxAppletService {
/**
* 微信小程序用户登陆，完整流程可参考下面官方地址，本例中是按此流程开发
* https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/login.html
* 1 . 我们的微信小程序端传入code。
* 2 . 调用微信code2session接口获取openid和session_key
* 3 . 根据openid和session_key自定义登陆态(Token)
* 4 . 返回自定义登陆态(Token)给小程序端。
* 5 . 我们的小程序端调用其他需要认证的api，请在header的Authorization里面携带 token信息
*
* @param code 小程序端 调用 wx.login 获取到的code,用于调用 微信code2session接口
* @return Token 返回后端 自定义登陆态 token 基于JWT实现
*/
public Token wxUserLogin(String code);
}

 　　返回给微信小程序token对象声明 Token :

package name.ealen.interfaces.dto;
/**
* Created by EalenXie on 2018/11/26 18:49.
* DTO 返回值token对象
*/
public class Token {
private String token;
public Token(String token) {
this.token = token;
}
/**
* 省略getter/setter
*/
}

5. 配置需要的基本组件，RestTemplate，Redis:

package name.ealen.infrastructure.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;
/**
* Created by EalenXie on 2018-03-23 07:37
* RestTemplate的配置类
*/
@Configuration
public class RestTemplateConfig {
@Bean
public RestTemplate restTemplate(ClientHttpRequestFactory factory) {
return new RestTemplate(factory);
}
@Bean
public ClientHttpRequestFactory simpleClientHttpRequestFactory() {
SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
factory.setReadTimeout(1000 * 60);      //读取超时时间为单位为60秒
factory.setConnectTimeout(1000 * 10);     //连接超时时间设置为10秒
return factory;
}
}

　　Redis的配置。本例是Springboot2.0的写法(和1.8的版本写法略有不同):

package name.ealen.infrastructure.config;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.cache.RedisCacheManager;
import org.springframework.data.redis.connection.RedisConnectionFactory;
/**
* Created by EalenXie on 2018-03-23 07:37
* Redis的配置类
*/
@Configuration
@EnableCaching
public class RedisConfig {

@Bean
public CacheManager cacheManager(RedisConnectionFactory factory) {
return RedisCacheManager.create(factory);
}
}

6. JWT的核心过滤器配置。继承了Shiro的BasicHttpAuthenticationFilter，并重写了其鉴权的过滤方法 :

package name.ealen.infrastructure.config.jwt;
import name.ealen.domain.vo.JwtToken;
import org.apache.shiro.web.filter.authc.BasicHttpAuthenticationFilter;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.RequestMethod;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Created by EalenXie on 2018/11/26 10:26.
* JWT核心过滤器配置
* 所有的请求都会先经过Filter，所以我们继承官方的BasicHttpAuthenticationFilter，并且重写鉴权的方法。
* 执行流程 preHandle->isAccessAllowed->isLoginAttempt->executeLogin
*/
public class JwtFilter extends BasicHttpAuthenticationFilter {

/**
* 判断用户是否想要进行 需要验证的操作
* 检测header里面是否包含Authorization字段即可
*/
@Override
protected boolean isLoginAttempt(ServletRequest request, ServletResponse response) {
String auth = getAuthzHeader(request);
return auth != null && !auth.equals("");

}
/**
* 此方法调用登陆，验证逻辑
*/
@Override
protected boolean isAccessAllowed(ServletRequest request, ServletResponse response, Object mappedValue) {
if (isLoginAttempt(request, response)) {
JwtToken token = new JwtToken(getAuthzHeader(request));
getSubject(request, response).login(token);
}
return true;
}
/**
* 提供跨域支持
*/
@Override
protected boolean preHandle(ServletRequest request, ServletResponse response) throws Exception {
HttpServletRequest httpServletRequest = (HttpServletRequest) request;
HttpServletResponse httpServletResponse = (HttpServletResponse) response;
httpServletResponse.setHeader("Access-control-Allow-Origin", httpServletRequest.getHeader("Origin"));
httpServletResponse.setHeader("Access-Control-Allow-Methods", "GET,POST,OPTIONS,PUT,DELETE");
httpServletResponse.setHeader("Access-Control-Allow-Headers", httpServletRequest.getHeader("Access-Control-Request-Headers"));
// 跨域时会首先发送一个option请求，这里我们给option请求直接返回正常状态
if (httpServletRequest.getMethod().equals(RequestMethod.OPTIONS.name())) {
httpServletResponse.setStatus(HttpStatus.OK.value());
return false;
}
return super.preHandle(request, response);
}
}

　　JWT的核心配置(包含Token的加密创建，JWT续期，解密验证) :

package name.ealen.infrastructure.config.jwt;
import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTVerifier;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.exceptions.JWTDecodeException;
import name.ealen.domain.entity.WxAccount;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;
import java.util.Date;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
/**
* Created by EalenXie on 2018/11/22 17:16.
*/
@Component
public class JwtConfig {
/**
* JWT 自定义密钥 我这里写死的
*/
private static final String SECRET_KEY = "5371f568a45e5ab1f442c38e0932aef24447139b";
/**
* JWT 过期时间值 这里写死为和小程序时间一致 7200 秒，也就是两个小时
*/
private static long expire_time = 7200;
@Autowired
private StringRedisTemplate redisTemplate;
/**
* 根据微信用户登陆信息创建 token
* 注 : 这里的token会被缓存到redis中,用作为二次验证
* redis里面缓存的时间应该和jwt token的过期时间设置相同
*
* @param wxAccount 微信用户信息
* @return 返回 jwt token
*/
public String createTokenByWxAccount(WxAccount wxAccount) {
String jwtId = UUID.randomUUID().toString();   //JWT 随机ID,做为验证的key
//1 . 加密算法进行签名得到token
Algorithm algorithm = Algorithm.HMAC256(SECRET_KEY);
String token = JWT.create()
.withClaim("wxOpenId", wxAccount.getWxOpenid())
.withClaim("sessionKey", wxAccount.getSessionKey())
.withClaim("jwt-id", jwtId)
.withExpiresAt(new Date(System.currentTimeMillis() + expire_time*1000)) //JWT 配置过期时间的正确姿势
.sign(algorithm);
//2 . Redis缓存JWT, 注 : 请和JWT过期时间一致
redisTemplate.opsForValue().set("JWT-SESSION-" + jwtId, token, expire_time, TimeUnit.SECONDS);
return token;
}
/**
* 校验token是否正确
* 1 . 根据token解密，解密出jwt-id , 先从redis中查找出redisToken，匹配是否相同
* 2 . 然后再对redisToken进行解密，解密成功则 继续流程 和 进行token续期
*
* @param token 密钥
* @return 返回是否校验通过
*/
public boolean verifyToken(String token) {
try {
//1 . 根据token解密，解密出jwt-id , 先从redis中查找出redisToken，匹配是否相同
String redisToken = redisTemplate.opsForValue().get("JWT-SESSION-" + getJwtIdByToken(token));
if (!redisToken.equals(token)) return false;
//2 . 得到算法相同的JWTVerifier
Algorithm algorithm = Algorithm.HMAC256(SECRET_KEY);
JWTVerifier verifier = JWT.require(algorithm)
.withClaim("wxOpenId", getWxOpenIdByToken(redisToken))
.withClaim("sessionKey", getSessionKeyByToken(redisToken))
.withClaim("jwt-id", getJwtIdByToken(redisToken))
.acceptExpiresAt(System.currentTimeMillis() + expire_time*1000 ) //JWT 正确的配置续期姿势
.build();
//3 . 验证token
verifier.verify(redisToken);
//4 . Redis缓存JWT续期
redisTemplate.opsForValue().set("JWT-SESSION-" + getJwtIdByToken(token), redisToken, expire_time, TimeUnit.SECONDS);
return true;
} catch (Exception e) { //捕捉到任何异常都视为校验失败
return false;
}
}
/**
* 根据Token获取wxOpenId(注意坑点 : 就算token不正确，也有可能解密出wxOpenId,同下)
*/
public String getWxOpenIdByToken(String token) throws JWTDecodeException {
return JWT.decode(token).getClaim("wxOpenId").asString();
}
/**
* 根据Token获取sessionKey
*/
public String getSessionKeyByToken(String token) throws JWTDecodeException {
return JWT.decode(token).getClaim("sessionKey").asString();
}
/**
* 根据Token 获取jwt-id
*/
private String getJwtIdByToken(String token) throws JWTDecodeException {
return JWT.decode(token).getClaim("jwt-id").asString();
}
}

7 . 自定义Shiro的Realm配置，Realm是自定义登陆及授权的逻辑配置 :

package name.ealen.infrastructure.config.shiro;
import name.ealen.domain.vo.JwtToken;
import name.ealen.infrastructure.config.jwt.JwtConfig;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationInfo;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.authc.SimpleAuthenticationInfo;
import org.apache.shiro.authc.credential.CredentialsMatcher;
import org.apache.shiro.authz.AuthorizationInfo;
import org.apache.shiro.authz.SimpleAuthorizationInfo;
import org.apache.shiro.realm.AuthorizingRealm;
import org.apache.shiro.realm.Realm;
import org.apache.shiro.subject.PrincipalCollection;
import org.springframework.stereotype.Component;
import javax.annotation.Resource;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
/**
* Created by EalenXie on 2018/11/26 12:12.
* Realm 的一个配置管理类 allRealm()方法得到所有的realm
*/
@Component
public class ShiroRealmConfig {
@Resource
private JwtConfig jwtConfig;
/**
* 配置所有自定义的realm,方便起见,应对可能有多个realm的情况
*/
public List<Realm> allRealm() {
List<Realm> realmList = new LinkedList<>();
AuthorizingRealm jwtRealm = jwtRealm();
realmList.add(jwtRealm);
return Collections.unmodifiableList(realmList);
}
/**
* 自定义 JWT的 Realm
* 重写 Realm 的 supports() 方法是通过 JWT 进行登录判断的关键
*/
private AuthorizingRealm jwtRealm() {
AuthorizingRealm jwtRealm = new AuthorizingRealm() {
/**
* 注意坑点 : 必须重写此方法，不然Shiro会报错
* 因为创建了 JWTToken 用于替换Shiro原生 token,所以必须在此方法中显式的进行替换，否则在进行判断时会一直失败
*/
@Override
public boolean supports(AuthenticationToken token) {
return token instanceof JwtToken;
}
@Override
protected AuthorizationInfo doGetAuthorizationInfo(PrincipalCollection principals) {
return new SimpleAuthorizationInfo();
}
/**
* 校验 验证token逻辑
*/
@Override
protected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken token) {
String jwtToken = (String) token.getCredentials();
String wxOpenId = jwtConfig.getWxOpenIdByToken(jwtToken);
String sessionKey = jwtConfig.getSessionKeyByToken(jwtToken);
if (wxOpenId == null || wxOpenId.equals(""))
throw new AuthenticationException("user account not exits , please check your token");
if (sessionKey == null || sessionKey.equals(""))
throw new AuthenticationException("sessionKey is invalid , please check your token");
if (!jwtConfig.verifyToken(jwtToken))
throw new AuthenticationException("token is invalid , please check your token");
return new SimpleAuthenticationInfo(token, token, getName());
}
};
jwtRealm.setCredentialsMatcher(credentialsMatcher());
return jwtRealm;
}
/**
* 注意坑点 : 密码校验 , 这里因为是JWT形式,就无需密码校验和加密,直接让其返回为true(如果不设置的话,该值默认为false,即始终验证不通过)
*/
private CredentialsMatcher credentialsMatcher() {
return (token, info) -> true;
}
}

　　Shiro的核心配置，包含配置Realm :

package name.ealen.infrastructure.config.shiro;
import name.ealen.infrastructure.config.jwt.JwtFilter;
import org.apache.shiro.mgt.DefaultSessionStorageEvaluator;
import org.apache.shiro.mgt.DefaultSubjectDAO;
import org.apache.shiro.spring.LifecycleBeanPostProcessor;
import org.apache.shiro.spring.security.interceptor.AuthorizationAttributeSourceAdvisor;
import org.apache.shiro.spring.web.ShiroFilterFactoryBean;
import org.apache.shiro.web.mgt.DefaultWebSecurityManager;
import org.springframework.aop.framework.autoproxy.DefaultAdvisorAutoProxyCreator;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.DependsOn;
import javax.servlet.Filter;
import java.util.HashMap;
import java.util.Map;
/**
* Created by EalenXie on 2018/11/22 18:28.
*/
@Configuration
public class ShirConfig {
/**
* SecurityManager,安全管理器,所有与安全相关的操作都会与之进行交互;
* 它管理着所有Subject,所有Subject都绑定到SecurityManager,与Subject的所有交互都会委托给SecurityManager
* DefaultWebSecurityManager :
* 会创建默认的DefaultSubjectDAO(它又会默认创建DefaultSessionStorageEvaluator)
* 会默认创建DefaultWebSubjectFactory
* 会默认创建ModularRealmAuthenticator
*/
@Bean
public DefaultWebSecurityManager securityManager(ShiroRealmConfig shiroRealmConfig) {
DefaultWebSecurityManager securityManager = new DefaultWebSecurityManager();
securityManager.setRealms(shiroRealmConfig.allRealm()); //设置realm
DefaultSubjectDAO subjectDAO = (DefaultSubjectDAO) securityManager.getSubjectDAO();
// 关闭自带session
DefaultSessionStorageEvaluator evaluator = (DefaultSessionStorageEvaluator) subjectDAO.getSessionStorageEvaluator();
evaluator.setSessionStorageEnabled(Boolean.FALSE);
subjectDAO.setSessionStorageEvaluator(evaluator);
return securityManager;
}
/**
* 配置Shiro的访问策略
*/
@Bean
public ShiroFilterFactoryBean factory(DefaultWebSecurityManager securityManager) {
ShiroFilterFactoryBean factoryBean = new ShiroFilterFactoryBean();
Map<String, Filter> filterMap = new HashMap<>();
filterMap.put("jwt", new JwtFilter());
factoryBean.setFilters(filterMap);
factoryBean.setSecurityManager(securityManager);
Map<String, String> filterRuleMap = new HashMap<>();
//登陆相关api不需要被过滤器拦截
filterRuleMap.put("/api/wx/user/login/**", "anon");
filterRuleMap.put("/api/response/**", "anon");
// 所有请求通过JWT Filter
filterRuleMap.put("/**", "jwt");
factoryBean.setFilterChainDefinitionMap(filterRuleMap);
return factoryBean;
}
/**
* 添加注解支持
*/
@Bean
@DependsOn("lifecycleBeanPostProcessor")
public DefaultAdvisorAutoProxyCreator defaultAdvisorAutoProxyCreator() {
DefaultAdvisorAutoProxyCreator defaultAdvisorAutoProxyCreator = new DefaultAdvisorAutoProxyCreator();
defaultAdvisorAutoProxyCreator.setProxyTargetClass(true); // 强制使用cglib，防止重复代理和可能引起代理出错的问题
return defaultAdvisorAutoProxyCreator;
}
/**
* 添加注解依赖
*/
@Bean
public LifecycleBeanPostProcessor lifecycleBeanPostProcessor() {
return new LifecycleBeanPostProcessor();
}

/**
* 开启注解验证
*/
@Bean
public AuthorizationAttributeSourceAdvisor authorizationAttributeSourceAdvisor(DefaultWebSecurityManager securityManager) {
AuthorizationAttributeSourceAdvisor authorizationAttributeSourceAdvisor = new AuthorizationAttributeSourceAdvisor();
authorizationAttributeSourceAdvisor.setSecurityManager(securityManager);
return authorizationAttributeSourceAdvisor;
}
}

　　用于Shiro鉴权的JwtToken对象 :

package name.ealen.domain.vo;
import org.apache.shiro.authc.AuthenticationToken;
/**
* Created by EalenXie on 2018/11/22 18:21.
* 鉴权用的token vo ，实现 AuthenticationToken
*/
public class JwtToken implements AuthenticationToken {
private String token;
public JwtToken(String token) {
this.token = token;
}
@Override
public Object getPrincipal() {
return token;
}
@Override
public Object getCredentials() {
return token;
}
public String getToken() {
return token;
}
public void setToken(String token) {
this.token = token;
}
}

8 . 实现实体的行为及业务逻辑，此例主要是调用微信接口code2session和创建返回token :   

package name.ealen.domain.service;
import name.ealen.application.WxAppletService;
import name.ealen.domain.entity.WxAccount;
import name.ealen.domain.repository.WxAccountRepository;
import name.ealen.domain.vo.Code2SessionResponse;
import name.ealen.infrastructure.config.jwt.JwtConfig;
import name.ealen.infrastructure.util.HttpUtil;
import name.ealen.infrastructure.util.JSONUtil;
import name.ealen.interfaces.dto.Token;
import org.apache.shiro.authc.AuthenticationException;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.stereotype.Service;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;
import javax.annotation.Resource;
import java.net.URI;
import java.util.Date;
/**
* Created by EalenXie on 2018/11/26 10:50.
* 实体 行为描述
*/
@Service
public class WxAccountService implements WxAppletService {
@Resource
private RestTemplate restTemplate;
@Value("${wx.applet.appid}")
private String appid;
@Value("${wx.applet.appsecret}")
private String appSecret;
@Resource
private WxAccountRepository wxAccountRepository;
@Resource
private JwtConfig jwtConfig;
/**
* 微信的 code2session 接口 获取微信用户信息
* 官方说明 : https://developers.weixin.qq.com/miniprogram/dev/api/open-api/login/code2Session.html
*/
private String code2Session(String jsCode) {
String code2SessionUrl = "https://api.weixin.qq.com/sns/jscode2session";
MultiValueMap<String, String> params = new LinkedMultiValueMap<>();
params.add("appid", appid);
params.add("secret", appSecret);
params.add("js_code", jsCode);
params.add("grant_type", "authorization_code");
URI code2Session = HttpUtil.getURIwithParams(code2SessionUrl, params);
return restTemplate.exchange(code2Session, HttpMethod.GET, new HttpEntity<String>(new HttpHeaders()), String.class).getBody();
}
/**
* 微信小程序用户登陆，完整流程可参考下面官方地址，本例中是按此流程开发
* https://developers.weixin.qq.com/miniprogram/dev/framework/open-ability/login.html
*
* @param code 小程序端 调用 wx.login 获取到的code,用于调用 微信code2session接口
* @return 返回后端 自定义登陆态 token 基于JWT实现
*/
@Override
public Token wxUserLogin(String code) {
//1 . code2session返回JSON数据
String resultJson = code2Session(code);
//2 . 解析数据
Code2SessionResponse response = JSONUtil.jsonString2Object(resultJson, Code2SessionResponse.class);
if (!response.getErrcode().equals("0"))
throw new AuthenticationException("code2session失败 : " + response.getErrmsg());
else {
//3 . 先从本地数据库中查找用户是否存在
WxAccount wxAccount = wxAccountRepository.findByWxOpenid(response.getOpenid());
if (wxAccount == null) {
wxAccount = new WxAccount();
wxAccount.setWxOpenid(response.getOpenid()); //不存在就新建用户
}
//4 . 更新sessionKey和 登陆时间
wxAccount.setSessionKey(response.getSession_key());
wxAccount.setLastTime(new Date());
wxAccountRepository.save(wxAccount);
//5 . JWT 返回自定义登陆态 Token
String token = jwtConfig.createTokenByWxAccount(wxAccount);
return new Token(token);
}
}
}

　　小程序code2session接口的返回VO对象Code2SessionResponse :

package name.ealen.domain.vo;
/**
* 微信小程序 Code2Session 接口返回值 对象
* 具体可以参考小程序官方API说明 : https://developers.weixin.qq.com/miniprogram/dev/api/open-api/login/code2Session.html
*/
public class Code2SessionResponse {
private String openid;
private String session_key;
private String unionid;
private String errcode = "0";
private String errmsg;
private int expires_in;
/**
* 省略getter/setter
*/
}

9.  定义我们的接口信息WxAppletController，此例包含一个登录获取token的api和一个需要认证的测试api :

package name.ealen.interfaces.facade;
import name.ealen.application.WxAppletService;
import org.apache.shiro.authz.annotation.RequiresAuthentication;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import javax.annotation.Resource;
import java.util.HashMap;
import java.util.Map;
/**
* Created by EalenXie on 2018/11/26 10:44.
* 小程序后台 某 API
*/
@RestController
public class WxAppletController {
@Resource
private WxAppletService wxAppletService;
/**
* 微信小程序端用户登陆api
* 返回给小程序端 自定义登陆态 token
*/
@PostMapping("/api/wx/user/login")
public ResponseEntity wxAppletLoginApi(@RequestBody Map<String, String> request) {
if (!request.containsKey("code") || request.get("code") == null || request.get("code").equals("")) {
Map<String, String> result = new HashMap<>();
result.put("msg", "缺少参数code或code不合法");
return new ResponseEntity<>(result, HttpStatus.BAD_REQUEST);
} else {
return new ResponseEntity<>(wxAppletService.wxUserLogin(request.get("code")), HttpStatus.OK);
}
}
/**
* 需要认证的测试接口 需要 @RequiresAuthentication 注解，则调用此接口需要 header 中携带自定义登陆态 authorization
*/
@RequiresAuthentication
@PostMapping("/sayHello")
public ResponseEntity sayHello() {
Map<String, String> result = new HashMap<>();
result.put("words", "hello World");
return new ResponseEntity<>(result, HttpStatus.OK);
}
}

10 . 运行主类，检查与数据库和redis的连接，进行测试 : 

package name.ealen;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* Created by EalenXie on 2018/11/26 10:25.
*/
@SpringBootApplication
public class ShiroJwtAppletApplication {
public static void main(String[] args) {
SpringApplication.run(ShiroJwtAppletApplication.class, args);
}

总结

以上所述是小编给大家介绍的Java中基于Shiro,JWT实现微信小程序登录完整例子及实现过程，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！

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