Jackson将对象数组反序列化为数组列表

Question

我有以下JSON文件要反序列化

{
    "rows":
    [
        {
            "USER_ID": 001,
            "COMMISSION": 0,
            "SWAPS": -1.87,
            "PROFIT": -73.39,
            "COMMENT": "MAM|12345678|10020031"
        },
        {
            "USER_ID": 002,
            "COMMISSION": 0,
            "SWAPS": 0,
            "PROFIT": 12.23,
            "COMMENT": "PAMM|12345678|10229501"
        },
        {
            "USER_ID": 003,
            "COMMISSION": 0,
            "SWAPS": 0,
            "PROFIT": 396.77,
            "COMMENT": "PAMM|12345678|10229501"
        },      
...
]}

Data
@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonPropertyOrder({
        "rows"
})
@Generated("jsonschema2pojo")
public class Rows {

    @JsonProperty("rows")
    private ArrayList<Row> rows = null;

    @JsonProperty("rows")
    public ArrayList<Row> getRows() {
        return rows;
    }

    @JsonProperty("rows")
    public void setRows(ArrayList<Row> rows) {
        this.rows = rows;
    }

@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonPropertyOrder({
        "USER_ID",
        "COMMISSION",
        "SWAPS",
        "PROFIT",
        "COMMENT"
})
@Generated("jsonschema2pojo")
public class Row {
    @JsonProperty("USER_ID")
    private int userId;
    @JsonProperty("COMMISSION")
    private float commission;
    @JsonProperty("SWAPS")
    private float swaps;
    @JsonProperty("PROFIT")
    private float profit;
    @JsonProperty("COMMENT")
    private String comment;

    @JsonProperty("USER_ID")
    public int getUserId() {
        return userId;
    }

    @JsonProperty("USER_ID")
    public void setUserId(int userId) {
        this.userId = userId;
    }

    @JsonProperty("COMMISSION")
    public float getCommission() {
        return commission;
    }
//..setter/getter continue..

 ObjectMapper mapper = new ObjectMapper();
        mapper.configure(DeserializationFeature.ACCEPT_SINGLE_VALUE_AS_ARRAY, true);


ArrayList<Rows> rowsArrayList = mapper.readValue(new File(ClientsRecordsPath), ArrayList.class);

            //json array to array object
            System.out.println("JSON array to Array objects...");
            System.out.println(rowsArrayList.get(0));

COMMENT=PAMM|123456|10314558}, {USER_ID=001, COMMISSION=0, SWAPS=0, PROFIT=13.57, COMMENT=PAMM|123456|10314558}, {USER_ID=002, COMMISSION=0, SWAPS=0, PROFIT=67.47, COMMENT=PAMM|123456|10314558}, {USER_ID=003, COMMISSION=0, SWAPS=0, PROFIT=202.41, COMMENT=PAMM|123456|10314558}, {USER_ID=004, COMMISSION=0, SWAPS=0, PROFIT=58.96, COMMENT=PAMM|123456|10314558}, {USER_ID=005, COMMISSION=0, SWAPS=0, PROFIT=6095, COMMENT=PAMM|123456|10314560}, {USER_ID=006, COMMISSION=0, ....

Answer 1

解析json文件的代码将是：

Rows rows = mapper.readValue(new File(ClientsRecordsPath), Rows.class);

由于json的根由Rows类表示，而不是ArrayList