Java 列表仅用JSON中的一行填充，应该用许多行填充

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

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;
    }
}

我为进行插入而编写的代码如下：

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)));
    }

}

它在json上执行for循环，但只添加最后一个值

我想添加所有值

提前感谢

您应该使用空的arraylist初始化逻辑

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

及

---

Replace logics=new ArrayListStarRays.asListnew Logiccif2；使用logics.addnew Logiccif2

我认为这是罪魁祸首

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

到

---

这样，它将帮助您发现记录大小中的错误和其他相关问题。

JSF数据表从不从json填充，而是从java列表填充。因此，如果您的循环未能添加全部，那么这是一个纯java/json的东西，与JSF无关。调用api也与JSF无关。所有这些都是纯java代码。好的，谢谢你的回答，但是你能告诉我我的代码有什么问题吗？我从JSON中获取数据，并输入一个变量，我试图将其加载到java列表中，但它只加载一个值。。。

logics.append(  new ArrayList<Logic>(Arrays.asList(new Logic(cif2))) );

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)));
}

ObjectMapper objectMapper = new ObjectMapper();//Create the ObjectMapper

// readValue accepts 2 param. string to be converted, and Object class/type to be used on mapping the data.
logics = objectMapper.readValue(sb.toString(), new TypeReference<List<Logic>>(){});
//If you have a adapter class to handle the entire JSON Record, you can use it to replace Logic.

//Make sure you have correct attribute as to the JSON you are going to map in this object
class JSONReceived{
    private . . . // attributes of the JSON


    //getters and setters

    public List<Mesaje> getMesajeList(){
        //do your stuff here
    }
}

ObjectMapper objectMapper = new ObjectMapper();//Create the ObjectMapper

JSONReceived json = objectMapper.readValue(sb.toString(), JSONReceived.class); 
logics = json. getMesajeList();