Java17+Spring RestTemplate调用GithubApi

## 简介

GithubApi 官方提供一了一些SDK，node仓库的好用一些，Java的也有官方推荐的，但是用的不是很多，所以还是决定自己写以下。

本文记录几个使用 `RestTemplate` 调用 `GithubApi` 的实例。

- 环境：`Java17` + `Springboot3.2+`

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## 输出List：分页请求

```java

    /**
     * 仓库发布信息列表查询URL
     */
    private static final String RELEASE_LIST_URL = "https://api.github.com/repos/{user}/{repo}/releases";
    
    /**
     * 获取仓库Releases列表
     *
     * @param user user
     * @param repo repo
     * @param pageParam 分页参数
     * @return List<GithubRelease>
     */
    public static List<GithubRelease> getReleases(String user, String repo, Map<String, Object> pageParam) {
        String url = RELEASE_LIST_URL
                .replace("{user}", user)
                .replace("{repo}", repo);
        RestTemplate restTemplate = new RestTemplate();
        // 请求信息封装
        RequestEntity<Void> requestEntity = getRequestEntity(url, null, pageParam);
        // 发送请求并获得响应
        ResponseEntity<List<GithubRelease>> responseEntity = restTemplate.exchange(requestEntity, new ParameterizedTypeReference<List<GithubRelease>>() {
        });
        return responseEntity.getBody();
    }
    
    
    private static RequestEntity<Void> getRequestEntity(String url, Map<String, String> headerMap, Map<String, Object> param) {
        HttpHeaders headers = new HttpHeaders();
        if (AitLogProperties.getGithubToken() != null) {
            headers.setBearerAuth(AitLogProperties.getGithubToken());
        }
        if (headerMap != null) {
            for (Map.Entry<String, String> entry : headerMap.entrySet()) {
                headers.add(entry.getKey(), entry.getValue());
            }
        }

        return new RequestEntity<>(headers, HttpMethod.GET, URI.create(url + mapToUrlParam(param)));
    }
```

## 输出Map/Object

```java
    /**
     * 仓库基本信息查询URL
     */
    private static final String REPO_INFO_URL = "https://api.github.com/repos/{user}/{repo}";

    /**
     * 获取仓库信息
     *
     * @param user GithubUser
     * @param repo GithubRepo
     * @return GithubRepository
     */
    public static GithubRepository getRepoInfo(String user, String repo) {
        String url = REPO_INFO_URL
                .replace("{user}", user)
                .replace("{repo}", repo);
        return get(url, null, GithubRepository.class);
    }

    /**
     * Get 请求封装
     *
     * @param  url   请求地址
     * @param  param 请求参数
     * @param  clazz 响应数据实体类型
     * @return 响应数据实体
     */
    public static <T> T get(String url, Map<String, Object> param, Class<T> clazz) {
        RestTemplate restTemplate = new RestTemplate();
        RequestEntity<Void> requestEntity = getRequestEntity(url, null, param);
        ResponseEntity<T> responseEntity = restTemplate.exchange(
                requestEntity,
                clazz
        );
        return responseEntity.getBody();
    }
```

## 输出String

```java
    /**
     * Readme URL
     */
    private static final String README_URL = "https://api.github.com/repos/{user}/{repo}/readme";

    /**
     * 获取一个仓库的Readme内容，以Html格式返回
     *
     * @param user the username of the repository owner
     * @param repo the name of the repository
     * @return the HTML content of the README file
     */
    public static String getReadmeHtml(String user, String repo) {
        String url = README_URL
                .replace("{user}", user)
                .replace("{repo}", repo);

        RestTemplate restTemplate = new RestTemplate();

        HttpHeaders headers = new HttpHeaders();
        // 设置请求头
        if (AitLogProperties.getGithubToken() != null) {
            headers.setBearerAuth(AitLogProperties.getGithubToken());
        }
        headers.setAccept(MediaType.parseMediaTypes("application/vnd.github.html+json"));

        RequestEntity<Void> requestEntity = new RequestEntity<>(headers, HttpMethod.GET, URI.create(url));
        // 发送请求并获得响应
        ResponseEntity<String> responseEntity = restTemplate.exchange(
                requestEntity,
                String.class
        );
        return responseEntity.getBody();
    }

```