网桥工作原理java

网桥是用于连接不同网段的网络设备，它的主要功能是根据目的地址来决定是否转发帧。下面是一个使用Java模拟网桥工作原理的示例：

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class BridgeSimulation {
    private Map<String, String> forwardingTable;

    public BridgeSimulation() {
        forwardingTable = new HashMap<>();
    }

    public void readFrames(String file1, String file2) {
        try (BufferedReader reader1 = new BufferedReader(new FileReader(file1));
             BufferedReader reader2 = new BufferedReader(new FileReader(file2))) {
            String frame1, frame2;
            while ((frame1 = reader1.readLine()) != null && (frame2 = reader2.readLine()) != null) {
                System.out.println("Received frame from file 1: " + frame1);
                System.out.println("Received frame from file 2: " + frame2);

                String destAddress1 = frame1.split(",")[0];
                String destAddress2 = frame2.split(",")[0];

                if (forwardingTable.containsKey(destAddress1)) {
                    System.out.println("Forwarding frame from file 1 to " + forwardingTable.get(destAddress1));
                } else {
                    System.out.println("Discarding frame from file 1");
                }

                if (forwardingTable.containsKey(destAddress2)) {
                    System.out.println("Forwarding frame from file 2 to " + forwardingTable.get(destAddress2));
                } else {
                    System.out.println("Discarding frame from file 2");
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void addEntryToForwardingTable(String destAddress, String port) {
        forwardingTable.put(destAddress, port);
    }

    public static void main(String[] args) {
        BridgeSimulation bridge = new BridgeSimulation();
        bridge.addEntryToForwardingTable("00:11:22:33:44:55", "Port 1");
        bridge.addEntryToForwardingTable("AA:BB:CC:DD:EE:FF", "Port 2");
        bridge.readFrames("file1.txt", "file2.txt");
    }
}

这个示例中，我们首先创建了一个`BridgeSimulation`类来模拟网桥的工作原理。在`readFrames`方法中，我们从两个文件中读取帧数据，并根据目的地址来判断是否转发帧。转发表使用`forwardingTable`来存储目的地址和对应的端口。

在`main`方法中，我们创建了一个`BridgeSimulation`对象，并添加了一些转发表的条目。然后调用`readFrames`方法来模拟网桥从文件中接收帧并进行转发。