Java中关于文件路径读取问题的分析

package com.lxc.domain;
 
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Properties;
 
public class Test {
    public static void main(String[] args) {
        try {
            /**
             * Thread.currentThread() 当前线程对象
             * getContextClassLoader() 线程方法，获取的是当前线程的类加载器对象
             * getResource("") 这是类加载器对象的方法，当前线程的类加载器默认从类的根路径下加载资源
             *
             */
            String path = Thread.currentThread().getContextClassLoader().getResource("User.properties").getPath();
            System.out.println(path);
            FileReader reader = new FileReader(path);
    }
}

package com.lxc.domain;
 
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
 
public class Fanshe {
 
    public static void main(String[] args) {
        // 以流的方式读取
        InputStream inputStream = Thread.currentThread().getContextClassLoader().getResourceAsStream("com/lxc/domain/userProperties.properties");
        Properties properties = new Properties();
        try {
            properties.load(inputStream);
            inputStream.close();
            System.out.println(properties.getProperty("username"));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

package com.lxc.domain;
 
import java.util.ResourceBundle;
 
public class Fanshe {
 
    public static void main(String[] args) {
        ResourceBundle resourceBundle = ResourceBundle.getBundle("User");
        String username = resourceBundle.getString("username");
        System.out.println(username);
    }

package com.lxc.domain;
 
import java.util.ResourceBundle;
 
public class Fanshe {
 
    public static void main(String[] args) {
        ResourceBundle resourceBundle = ResourceBundle.getBundle("com/lxc/domain/User");
        String username = resourceBundle.getString("username");
        System.out.println(username);
    }
}