skyTakeAway-06

HttpClient

**HttpClient的核心API：**

- HttpClient：Http客户端对象类型，使用该类型对象可发起Http请求。

- HttpClients：可认为是构建器，可创建HttpClient对象。

- CloseableHttpClient：实现类，实现了HttpClient接口。

- HttpGet：Get方式请求类型。

- HttpPost：Post方式请求类型。

**HttpClient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

@SpringBootTest
public class HttpClientTest {

    /**
     * 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，接受响应结果
        CloseableHttpResponse response = httpClient.execute(httpGet);

        //获取服务端返回的状态码
        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

@Test
    public void testPOST() throws Exception{
        // 创建httpclient对象
        CloseableHttpClient httpClient = HttpClients.createDefault();

        //创建请求对象
        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());
        //指定请求编码方式
        entity.setContentEncoding("utf-8");
        //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);

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

微信小程序开发

idea代码配置

**配置微信登录所需配置项：**

application-dev.yml

```yaml
sky:
  wechat:
    appid: wxffb3637a228223b8
    secret: 84311df9199ecacdf4f12d27b6b9522d
```

application.yml

```yaml
sky:
  wechat:
    appid: ${sky.wechat.appid}
    secret: ${sky.wechat.secret}
```

**配置为微信用户生成jwt令牌时使用的配置项：**

application.yml

```yaml
sky:
  jwt:
    # 设置jwt签名加密时使用的秘钥
    admin-secret-key: itcast
    # 设置jwt过期时间
    admin-ttl: 7200000
    # 设置前端传递过来的令牌名称
    admin-token-name: token
    user-secret-key: itheima
    user-ttl: 7200000
    user-token-name: authentication
```

 导入商品浏览功能代码

**接口设计：**

- 查询分类

- 根据分类id查询菜品

- 根据分类id查询套餐

- 根据套餐id查询包含的菜品