从 POF 流中读取数组答案

【问题标题】：Reading an array from POF Stream从 POF 流中读取数组
【发布时间】：2014-06-19 15:18:45
【问题描述】：

有没有办法知道 POF 流中数组的元素数量？

我需要使用 PofReader 来读取数组。但是，我不知道如何使大小与 POF 流中的元素数量相匹配。

public class BasicTypesPofSerializer implements PofSerializer {

private static final int ARRAY_SIZE = 10;

private static final int ID = 0;

private static final int BOOLEAN1 = 1;
private static final int BOOLEAN2 = 2;
private static final int BOOLEAN3 = 3;

private static final int BYTE1 = 4;
private static final int BYTE2 = 5;
private static final int BYTE3 = 6;

private static final int SHORT1 = 7;
private static final int SHORT2 = 8;
private static final int SHORT3 = 9;

private static final int INT1 = 10;
private static final int INT2 = 11;
private static final int INT3 = 12;

private static final int FLOAT1 = 13;
private static final int FLOAT2 = 14;
private static final int FLOAT3 = 15;

private static final int DOUBLE1 = 16;
private static final int DOUBLE2 = 17;
private static final int DOUBLE3 = 18;

private static final int NUMBER1 = 19;
private static final int NUMBER2 = 20;

private static final int CHAR1 = 22;
private static final int CHAR2 = 23;
private static final int CHAR3 = 24;

private static final int STRING1 = 25;
private static final int STRING2 = 26;

private static final int DATE1 = 28;
private static final int DATE2 = 29;

private static final int OBJECT1 = 31;
private static final int OBJECT2 = 32;

private static final int CLASS1 = 34;
private static final int CLASS2 = 35;

@Override
public Object deserialize(PofReader reader) throws IOException {

    BasicTypes basic = new BasicTypes();

basic.number2 = (Number[]) reader.readObjectArray(NUMBER2, new Number[ARRAY_SIZE]);
basic.string2 = (String[]) reader.readObjectArray(STRING2, new String[ARRAY_SIZE]);
basic.obj2 = (Serializable[]) reader.readObjectArray(OBJECT2, new Serializable[ARRAY_SIZE]);

reader.readRemainder();
    return basic;
    }
}

正如您在此代码示例中所见，我有几个数组。每个元素中的元素数量可能相同也可能不同。我需要知道一种让大小与元素数量相匹配的方法，这样我就不会让元素被截断或空位。有没有办法做到这一点？

【问题讨论】：

根据documentation，您甚至不必知道大小。通过例如new Number[0] 应该可以工作。
我传递了一个 10，并读取了一个只有 2 个元素的数组，我得到了 8 个空字段
您是否尝试使用新号码[0]？
没问题，我已将解决方案作为答案发布在下面，以便您接受。

标签： java arrays deserialization

【解决方案1】：

根据documentation，您甚至不必知道大小。你可以这样做：

@Override
public Object deserialize(PofReader reader) throws IOException {

    BasicTypes basic = new BasicTypes();

    basic.number2 = (Number[]) reader.readObjectArray(NUMBER2, new Number[0]);
    basic.string2 = (String[]) reader.readObjectArray(STRING2, new String[0]);
    basic.obj2 = (Serializable[]) reader.readObjectArray(OBJECT2, new Serializable[0]);

    reader.readRemainder();
    return basic;
    }
}

我认为你甚至可以尝试传递 null。

【讨论】：