itheima苍穹外卖项目学习笔记--Day6: 微信登录 / 商品浏览

news2024/11/27 0:32:58

Day6

- a. HttpClient
- - GET方式请求：
  - POST方式请求：
- b. 微信登录

a. HttpClient

HttpClient 是Apache Jakarta Common 下的子项目，可以用来提供高效的、最新的、功能丰富的支持 HTTP 协议的客户端编程工具包，并且它支持 HTTP 协议最新的版本和建议。

核心API：

HttpClient
HttpClients
CloseableHttpClient
HttpGet
HttpPost

发送请求步骤：

创建HttpClient
对象创建Http
请求对象调用HttpClient的execute方法发送请求

GET方式请求：

/**
 * 测试通过httpclient发送GET方式的请求
 */
@Test
public void testGET() throws Exception {
    // 创建httpclient对象
    CloseableHttpClient httpClient = HttpClients.createDefault();

    // 创建请求对象
    HttpGet httpGet = new HttpGet("http://localhost:8080/user/shop/status");

    // 发送请求，接收响应结果
    CloseableHttpResponse response = httpClient.execute(httpGet);

    // 获取客户端返回的状态码
    int statusCode = response.getStatusLine().getStatusCode();
    System.out.println("服务端返回的状态码为：" + statusCode);

    HttpEntity entity = response.getEntity();
    String body = EntityUtils.toString(entity);
    System.out.println("服务端返回的数据为：" +body);

    // 关闭资源
    response.close();
    httpClient.close();
}

POST方式请求：

/**
 * 测试通过httpclient发送POST方式的请求
 */
@Test
public void testPOST() throws Exception {
    // 创建httpclient对象
    CloseableHttpClient httpClient = HttpClients.createDefault();

    // 创建对象
    HttpPost httpPost = new HttpPost("http://localhost:8080/admin/employee/login");

    JSONObject jsonObject = new JSONObject();
    jsonObject.put("username", "admin");
    jsonObject.put("password", "123456");

    StringEntity entity = new StringEntity(jsonObject.toString());
    // 指定请求的编码方式
    entity.setContentEncoding("UTF-8");
    // 指定传输的数据格式
    entity.setContentType("application/json");
    httpPost.setEntity(entity);

    // 发送请求
    CloseableHttpResponse response = httpClient.execute(httpPost);

    // 解析返回结果
    int statusCode = response.getStatusLine().getStatusCode();
    System.out.println("响应码为：" + statusCode);

    HttpEntity entity1 = response.getEntity();
    String body = EntityUtils.toString(entity1);
    System.out.println("响应数据为：" + body);

    // 关闭自由
    response.close();
    httpClient.close();
}

b. 微信登录

在这里插入图片描述

业务规则：

基于微信登录实现小程序的登录功能
如果是新用户需要自动完成注册

在application.yml中，写入相关配置，在application-dev.yml中写入具体的配置属性

sky:
  jwt:
    user-secret-key: 
    user-ttl: 7200000
    user-token-name: authentication
  wechat:
    appid: ${sky.wechat.appid}
    secret: ${sky.wechat.secret}

创建user/UserController，创建微信登录的方法

@RestController
@RequestMapping("/user/user")
@Api(tags = "C端用户相关接口")
@Slf4j
public class UserController {
    
    @Autowired
    private UserService userService;
    
    @Autowired
    private JwtProperties jwtProperties;

    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @PostMapping("/login")
    @ApiOperation("微信登录")
    public Result<UserLoginVO> login(@RequestBody UserLoginDTO userLoginDTO){
        log.info("微信用户登录：{}",userLoginDTO);
        // 微信登录
        User user = userService.wxLogin(userLoginDTO);
        
        // 为微信用户生成jwt令牌
        Map<String, Object> claims = new HashMap<>();
        claims.put(JwtClaimsConstant.USER_ID, user.getId());
        String token = JwtUtil.createJWT(jwtProperties.getUserSecretKey(), jwtProperties.getUserTtl(), claims);

        UserLoginVO userLoginVO = UserLoginVO.builder()
                .id(user.getId())
                .openid(user.getOpenid())
                .token(token)
                .build();

        return Result.success(userLoginVO);
    }
}

在UserServiceImpl中，实现wxLogin的方法，及其父类接口

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    // 微信服务接口地址
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;

    /**
     * 微信登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {

        String openid = getOpenid(userLoginDTO.getCode());

        // 判断openid是否为空，如果为空表示登录失败，抛出业务异常
        if (openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        // 判断当前用户是否为新用户
        User user = userMapper.getByOpenId(openid);

        // 如果是新用户，自动完成注册
        if (user == null){
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }

        // 返回这个用户对象
        return user;
    }

    /**
     * 调用微信接口服务，获取微信用户的openid
     * @param code
     * @return
     */
    private String getOpenid(String code){
        // 调用微信接口服务，获取当前微信用户的openid
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type", "authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);

        JSONObject jsonObject = JSON.parseObject(json);
        String openid = jsonObject.getString("openid");

        return openid;
    }
}

创建UserMapper，实现相关接口

@Mapper
public interface UserMapper {

    /**
     * 根据openid查询用户
     * @param openid
     * @return
     */
    @Select("Select * from user where openid = #{openid}")
    User getByOpenId(String openid);

    /**
     * 插入数据
     * @param user
     */
    void insert(User user);
}

在UserMapper.xml中，动态写入插入数据的SQL语句

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.sky.mapper.UserMapper">
    <insert id="insert" useGeneratedKeys="true" keyProperty="id">
        insert into user (openid, name, phone, sex, id_number, avatar, create_time)
            values
        (#{openid}, #{name}, #{phone}, #{sex}, #{idNumber}, #{avatar}, #{createTime})
    </insert>
</mapper>

编写JwtTokenUserInterceptor拦截器，校验用户端token是否是合法的

@Component
@Slf4j
public class JwtTokenUserInterceptor implements HandlerInterceptor {

    @Autowired
    private JwtProperties jwtProperties;

    /**
     * 校验jwt
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法，直接放行
            return true;
        }

        //1、从请求头中获取令牌
        String token = request.getHeader(jwtProperties.getUserTokenName());

        //2、校验令牌
        try {
            log.info("jwt校验:{}", token);
            Claims claims = JwtUtil.parseJWT(jwtProperties.getUserSecretKey(), token);
            Long userId = Long.valueOf(claims.get(JwtClaimsConstant.USER_ID).toString());
            log.info("当前用户的id：", userId);
            BaseContext.setCurrentId(userId);
            //3、通过，放行
            return true;
        } catch (Exception ex) {
            //4、不通过，响应401状态码
            response.setStatus(401);
            return false;
        }
    }
}

在WebMvcConfiguration中，注册拦截器

@Autowired
private JwtTokenUserInterceptor jwtTokenUserInterceptor;

/**
 * 注册自定义拦截器
 *
 * @param registry
 */
protected void addInterceptors(InterceptorRegistry registry) {
    log.info("开始注册自定义拦截器...");
    registry.addInterceptor(jwtTokenAdminInterceptor)
            .addPathPatterns("/admin/**")
            .excludePathPatterns("/admin/employee/login");

    registry.addInterceptor(jwtTokenUserInterceptor)
            .addPathPatterns("/user/**")
            .excludePathPatterns("/user/user/login")
            .excludePathPatterns("/user/shop/status");
}