Java获取classpath路径总结-优快云博客

本文链接：https://blog.youkuaiyun.com/yhm_js/article/details/79185609

本文介绍了两种在Java中获取class文件所在路径的方法：一种是通过静态方式，另一种是非静态方式。并给出了具体的代码实现，包括对不同JDK版本的支持。

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Java获取classpath路径总结

1概述

这里我对异常情况也做了屏蔽，给大家参考一下。资源文件放在资源目录即可。

1.1静态获取

private static URL currentStaticClassPathResourceUrl = null;

static {
    //1.静态调用:不能加/,而且还没有: file:
    currentStaticClassPathResourceUrl = Thread.currentThread().getContextClassLoader().getResource("packetText1.txt");
    if (null == currentStaticClassPathResourceUrl) { //支持非:JDK7和 JDK8
        currentStaticClassPathResourceUrl = Thread.currentThread().getContextClassLoader().getResource("/packetText1.txt");
    }
    System.out.println("[static]" + currentStaticClassPathResourceUrl.getPath());
}

public void testImmulateClient2() {

    String ip = "127.0.0.1";
    int port = 1500;

    PacketImmulateSender packetSender = new PacketImmulateSender(ip, port, new File(currentStaticClassPathResourceUrl.getPath()));
    Thread senderThread = new Thread(packetSender);
    senderThread.start();

    try {
        Thread.sleep(2000 * 60);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
    System.out.println("SubjectObserverClientTest End.");
}

1.2对象方法获取

public void testImmulateClient() {

    String ip = "127.0.0.1";
    int port = 1500;

    URL currentNoStaticClassPathResourceUrl = null;
    //非静态调用:加/
    currentNoStaticClassPathResourceUrl = this.getClass().getResource("/packetText1.txt");
    if (null == currentNoStaticClassPathResourceUrl) {
        currentNoStaticClassPathResourceUrl = this.getClass().getResource("packetText1.txt");
    }
    System.out.println("[no-static]" + currentNoStaticClassPathResourceUrl.getPath());

    PacketImmulateSender packetSender = new PacketImmulateSender(ip, port, new File(currentNoStaticClassPathResourceUrl.getPath()));
    Thread senderThread = new Thread(packetSender);
    senderThread.start();

    try {
        Thread.sleep(2000 * 60);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
    System.out.println("SubjectObserverClientTest End.");
}