如何在Java中打印字符串而不是地址？

我的输出是“[B@b42cbf“没有错误

它应该是一个表示“服务器检查”的字符串

如何修复代码以输出字符串而不是地址

我打印对象的代码已经更改了好几次，但现在如下所示

System.out.println(packet.getMessage().toString());

import java.io.Serializable;

public class Packet implements Serializable {

    final public short MESSAGE = 0;
    final public short COMMAND = 1;

    private String _ip;
    private short _type;
    private String _source;
    private String _destination;
    private byte[] _message;


    public Packet(String ip, short type, String source, String destination,
            byte[] message) {
        this._ip = ip;
        this._type = type;
        this._source = source;
        this._destination = destination;
        this._message = message;
    }

    public String getIP() {
        return this._ip;
    }

    public Short getType() {
        return this._type;
    }

    public String getSource() {
        return this._source;
    }

    public String getDestination() {
        return this._destination;
    }

    public byte[] getMessage() {
        return this._message;
    }
}

public void sendPacket(Packet packet) throws NoConnection {
        if (this._isConnected) {
            try {
                this._oos.writeObject(packet);
                this._oos.flush();  // Makes packet send
            } catch (Exception e) {
                e.printStackTrace();
                this._isConnected = false;
                throw new NoConnection("No notification of disconnection...");
            }
        } else {
            throw new NoConnection("No connection...");
        }
    }

我的分组课程如下

System.out.println(packet.getMessage().toString());

import java.io.Serializable;

public class Packet implements Serializable {

    final public short MESSAGE = 0;
    final public short COMMAND = 1;

    private String _ip;
    private short _type;
    private String _source;
    private String _destination;
    private byte[] _message;


    public Packet(String ip, short type, String source, String destination,
            byte[] message) {
        this._ip = ip;
        this._type = type;
        this._source = source;
        this._destination = destination;
        this._message = message;
    }

    public String getIP() {
        return this._ip;
    }

    public Short getType() {
        return this._type;
    }

    public String getSource() {
        return this._source;
    }

    public String getDestination() {
        return this._destination;
    }

    public byte[] getMessage() {
        return this._message;
    }
}

public void sendPacket(Packet packet) throws NoConnection {
        if (this._isConnected) {
            try {
                this._oos.writeObject(packet);
                this._oos.flush();  // Makes packet send
            } catch (Exception e) {
                e.printStackTrace();
                this._isConnected = false;
                throw new NoConnection("No notification of disconnection...");
            }
        } else {
            throw new NoConnection("No connection...");
        }
    }

我通过ObjectOutputStream发送数据包，并在ObjectInputStream中接收数据包。该对象用（数据包）覆盖到数据包中。您可以看到其工作原理如下

System.out.println(packet.getMessage().toString());

import java.io.Serializable;

public class Packet implements Serializable {

    final public short MESSAGE = 0;
    final public short COMMAND = 1;

    private String _ip;
    private short _type;
    private String _source;
    private String _destination;
    private byte[] _message;


    public Packet(String ip, short type, String source, String destination,
            byte[] message) {
        this._ip = ip;
        this._type = type;
        this._source = source;
        this._destination = destination;
        this._message = message;
    }

    public String getIP() {
        return this._ip;
    }

    public Short getType() {
        return this._type;
    }

    public String getSource() {
        return this._source;
    }

    public String getDestination() {
        return this._destination;
    }

    public byte[] getMessage() {
        return this._message;
    }
}

public void sendPacket(Packet packet) throws NoConnection {
        if (this._isConnected) {
            try {
                this._oos.writeObject(packet);
                this._oos.flush();  // Makes packet send
            } catch (Exception e) {
                e.printStackTrace();
                this._isConnected = false;
                throw new NoConnection("No notification of disconnection...");
            }
        } else {
            throw new NoConnection("No connection...");
        }
    }

这是听众

@Override
    public void run() {
        try {
            this._ois = new ObjectInputStream(this._socket.getInputStream());
            Packet packet = (Packet) this._ois.readObject();
            this._listener.addPacket(packet);
        } catch(Exception e) {
            e.printStackTrace();
        }
    }

---

[B@b42cbf

是打印字节数组（即二进制数据）时得到的结果

要从中获取字符串，您需要知道编码，然后可以执行以下操作：

String messageStr = new String(packet.getMessage(), "UTF-8");

---

当然，只有当数据实际上是可打印的数据时，这才有效。

这是正常的，您将数组对象打印为字符串

使用：

System.out.println（新字符串（packet.getMessage（））；

---

也就是说，用其中的字节构建一个字符串。请注意，这使用默认编码。

getMessage（）

返回一个字节数组。数组的

toString（）

方法不会打印其内容。您可以使

getMessage（）

返回一个

字符串

。

+1是的，你说得很对，这样好多了。我应该在SO上设置宵禁。