使用Jackson在java中序列化數組數組

Question

我正在學習如何使用 Jackson，我必須序列化一組 ContoCorrente 對象

public class ContoCorrente {
    private String proprietario;
    private ArrayList<MovimentoBancario> movimenti;
//methods...
}

其中 MovimentoBancario 被定義為

public class MovimentoBancario {
    private String data;
    private String causale;
//methods...
}

我試過

ArrayList<ContoCorrente> conti= new ArrayList<ContoCorrente>(50);
        for(int i=0; i<50; i++){
            //fill array
        }
        try {
            ObjectMapper mapper = new ObjectMapper();
            mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
            System.out.println(mapper.writeValueAsString(conti));  
        } catch (Exception e) {
            e.printStackTrace();
        }

但輸出是

[{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{}]

我不知道我做錯了什么，這是我第一次嘗試序列化

Answer 1

您可以嘗試使用 Jackson 定義特定方法。

private static final ObjectMapper objectMapper = new ObjectMapper();
private static final ObjectReader reader = new ObjectMapper().readerFor(Array.class);


public static String toArray(ArrayList<ContoCorrente> array) throws JsonProcessingException {
    return objectMapper.writeValueAsString(array);
}

然后，如果您想閱讀，請使用閱讀器。