java - 列表仅填充 JSON 中的一行，应该填充多行

Question

您好，我有一个 JSF 应用程序，它向 API 发出 GET 请求，获取 JSON，然后从该 JSON 获取元素并用它填充 JSF 数据表。我想用所有元素填充数据表，但只添加一个。

这是我的 Java 代码:

@ManagedBean(name = "logic", eager = true)
@SessionScoped
public class Logic  {

    static JSONObject jsonObject = null;
    static JSONObject jo = null;
    static JSONArray cat = null;

    private ArrayList<Logic> logics;
    StringBuilder sb = new StringBuilder();
    String cif2;

    public void connect()  {

        try {   
            URL url = new URL("xxx");
            URLConnection yc = url.openConnection();
            BufferedReader in = new BufferedReader(new InputStreamReader(yc.getInputStream()));
            String inputLine;

            while((inputLine = in.readLine())!= null){
                System.out.println(inputLine);
                sb.append(inputLine+"\n");
                in.close();
            }
        } catch(Exception e) {System.out.println(e);}
    }

    private String cif;

    public ArrayList<Logic> getLogics() {
        return logics;
    }

    public Logic() throws ParseException {
        connect();

        JSONParser parser = new JSONParser();

        jsonObject = (JSONObject) parser.parse(sb.toString());
        cat = (JSONArray) jsonObject.get("mesaje");
        for(int i = 0; i < cat.size(); i++) {
            jo = (JSONObject) cat.get(i);
            cif2 = jo.get("cif").toString();
            logics = new ArrayList<Logic>(Arrays.asList(new Logic(cif2)));
        }
    }

    public Logic(String cif) throws ParseException {
        this.cif = cif;
    }

    public String getCif() {
        return cif;
    }

    public void setCif(String cif) {
        this.cif = cif;
    }
}

我编写的用于插入的代码是这样的:

public Logic() throws ParseException {
    connect();

    JSONParser parser = new JSONParser();

    jsonObject = (JSONObject) parser.parse(sb.toString());
    cat = (JSONArray) jsonObject.get("mesaje");
    for(int i = 0; i < cat.size(); i++) {
    jo = (JSONObject) cat.get(i);
    cif2 = jo.get("cif").toString();
    logics = new ArrayList<Logic>(Arrays.asList(new Logic(cif2)));
    }

}

它对 json 执行 for 循环，但只添加最后一个值。

我想添加所有值

提前致谢

Answer 1

您应该初始化 logics带有空数组列表。

private ArrayList<Logic> logics = new ArrayList<>();

还有

替换logics = new ArrayList<Logic>(Arrays.asList(new Logic(cif2)));与 logics.add(new Logic(cif2));