java实现接口访问（一）

一、前置准备：

1. PostMan
2. 访问的网站：Github
3. 访问的接口：
   https://api.github.com/search/commits?q=committer-date:2017-11-27..2017-12-01&page=1&per_page=100
4. 实现访问：查找2017-11-27到 2017-12-01的100条数据

二、代码实现
1. 使用PostMan输入访问的接口，取得需要的字段，items，和items中repository的字段id，和full_name（可以自己获取想要的字段）

1. java类
   （1）、CommitRepo

public class CommitRepo {    private String id;    private String full_name;    @Override    public String toString() {        return "CommitRepo [id=" + id + ", full_name=" + full_name + "]";    }    public String getId() {        return id;    }    public String getFull_name() {        return full_name;    }}

（2）、CommitItems

public class CommitItems {    private CommitRepo repository;//名字要一样（repository）    public CommitRepo getRepository() {        return repository;    }    @Override    public String toString() {        return "CommitItems [repository=" + repository + "]";    }}

（3）、GithubCommitsResult

public class GithubCommitsResult {    private CommitItems[] items;    public CommitItems[] getItems() {        return items;    }    @Override    public String toString() {        return "GithubCommitsResult [items=" + Arrays.toString(items) + "]";    }}

（4）、GithubTest测试类

public static void main(String[] args) {    try {    URL url = new URL("https://api.github.com/search/commits?q=committer-date:2017-11-27..2017-12-01&page=10&per_page=100");    HttpsURLConnection https = (HttpsURLConnection) url.openConnection();// 打开连接                https.addRequestProperty("Accept","application/vnd.github.cloak-preview");// 设置请求属性    https.addRequestProperty("Authorization", "Basic "+up);    https.setDoInput(true);    InputStream is = https.getInputStream();    Gson gson = new GsonBuilder().create();    GithubCommitsResult gcr = gson.fromJson(new InputStreamReader(is),GithubCommitsResult.class);    for(int i=0;i<gcr.getItems().length;i++){          System.out.println(gcr.getItems()[i].getRepository().getId());    }        is.close();        https.disconnect();    } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }

（5）、GithubTest测试类代码修改

public static void main(String[] args) {    String url="https://api.github.com/search/commits?q=committer-date:2017-11-27..2017-12-01&page=1&per_page=100";    String ret=getGithubApiReply(url);    Gson gson = new GsonBuilder().create();    GithubCommitsResult gcr = gson.fromJson(ret,GithubCommitsResult.class);    System.out.println(gcr.getItems()[99].getRepository().getId());}

public static String getGithubApiReply(String api_url) {    String retstr = null;    try {        URL url = new URL(api_url);        HttpsURLConnection https = (HttpsURLConnection) url                    .openConnection();// 打开连接        https.addRequestProperty("Accept",                    "application/vnd.github.cloak-preview");// 设置请求属性               https.setDoInput(true);        InputStream is = https.getInputStream();        Reader reader = new InputStreamReader(is, "utf-8");        StringBuffer sb = new StringBuffer();        int c = -1;        while ((c = reader.read()) != -1) {            sb.append((char) c);        }        retstr = new String(sb);        is.close();        https.disconnect();    } catch (IOException e) {        e.printStackTrace();    }    return retstr;}