java private void write(String ipAddress, String message) throws IOException { FileWriter fileWriter = new FileWriter("src\\good\\better\\action.txt", true); fileWriter.write("ip地址:" + ipAddress + " "); fileWriter.write("时间:" + new Date() + " "); fileWriter.write("执行操作:"); fileWriter.write(message); fileWriter.write(" "); fileWriter.close();改进这段代码让它能够写入内容时换行
时间: 2024-03-24 17:41:23 浏览: 18
你可以在每个要换行的地方,使用`"\n"`或`System.lineSeparator()`来添加换行符。修改后的代码如下:
```
private void write(String ipAddress, String message) throws IOException {
FileWriter fileWriter = new FileWriter("src\\good\\better\\action.txt", true);
fileWriter.write("ip地址:" + ipAddress + " ");
fileWriter.write("时间:" + new Date() + "\n"); // 在时间后面添加换行符
fileWriter.write("执行操作:\n"); // 在执行操作后面添加换行符
fileWriter.write(message + "\n"); // 在操作内容后面添加换行符
fileWriter.close();
}
```
这样,每次写入内容时,都会自动换行,使得文本更易读。
相关问题
public static void main(String args[]) throws IOException { Scanner sc=new Scanner(System.in);
这是 Java 中一个简单的主函数,它使用 Scanner 类从命令行读取输入。具体来说,它创建了一个名为 sc 的 Scanner 对象,并将其与标准输入流 System.in 关联。接下来,它可以使用 sc 对象调用 Scanner 类中的方法来读取用户在命令行中输入的数据。在这个示例中,它使用了 throws IOException 来处理可能的输入输出异常。
将这个代码修改正确并输出结果import java.io.IOException; import java.net.DatagramPacket; import java.net.DatagramSocket; import java.net.InetAddress; public class UDPReceive { public static void main(String[ args) throws IOException { DatagramSocket receiveSocket = new DatagramSocket(12306); byte[] buffer = new byte[1024]; DatagramPacket dp = new DatagramPacket(buffer, 1024); receiveSocket.receive(dp); InetAddress ipAddress = dp.getAddress0; String ip = ipAddress.getHostAddress0; byte[] data = dp.getData0; int length = dp.getl ength0; String dataStr = new String(data,0,length); System.out.println("IP地址: "+ip+ ",数据是"+ dataStr); receiveSocket.close(; } public class UDPSend { public static void main(String[ args) throws IOException { DatagramSocket sendSocket = new DatagramSocket); byte[] buffer = "hello,UDP".getBytes0; DatagramPacket dp = new DatagramPacket(buffer, buffer.length, InetAddress .getByName("192.168.56.1"), 12306); //本机地址为 : 192.168.56.1 sendSocket.send(dp); sendSocket.close);
这段代码存在多处错误,我来帮你修改:
UDPReceive.java:
```java
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
public class UDPReceive {
public static void main(String[] args) throws IOException {
DatagramSocket receiveSocket = new DatagramSocket(12306);
byte[] buffer = new byte[1024];
DatagramPacket dp = new DatagramPacket(buffer, 1024);
receiveSocket.receive(dp);
InetAddress ipAddress = dp.getAddress();
String ip = ipAddress.getHostAddress();
byte[] data = dp.getData();
int length = dp.getLength();
String dataStr = new String(data, 0, length);
System.out.println("IP地址: " + ip + ", 数据是 " + dataStr);
receiveSocket.close();
}
}
```
UDPSend.java:
```java
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
public class UDPSend {
public static void main(String[] args) throws IOException {
DatagramSocket sendSocket = new DatagramSocket();
byte[] buffer = "hello,UDP".getBytes();
DatagramPacket dp = new DatagramPacket(buffer, buffer.length, InetAddress.getByName("192.168.56.1"), 12306);
// 本机地址为: 192.168.56.1
sendSocket.send(dp);
sendSocket.close();
}
}
```
这个程序的功能是通过UDP协议实现两个程序之间的通信,UDPSend程序向指定的IP地址和端口发送一个字符串,UDPReceive程序监听指定的端口,接收到数据后输出发送方的IP地址和数据内容。
程序输出结果为:
```
IP地址: 192.168.56.1, 数据是 hello,UDP
```
希望我的回答能够帮到你!