使用IDEA新建一个Maven项目
demo/ src/ main/ java/ resources/ # 资源路径 target/ classes/ # 编译后文件
resources文件夹下的文件在编译后，都放在了根目录classes之下
一、获取项目路径
package com.demo; import java.net.URL; public class App { public static void main(String[] args) { //项目根路径 URL url1 = App.class.getClassLoader().getResource(""); System.out.println(url1.getPath()); // 项目根路径 URL url2 = App.class.getResource("/"); System.out.println(url2.getPath()); // 文件根路径 URL url3 = App.class.getResource(""); System.out.println(url3.getPath()); } }
输出结果(省略/demo前的路径，只看后面的路径)
package com.demo; import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; import java.net.URL; public class App { public static void main(String[] args) throws IOException { URL url = App.class.getResource("/name.txt"); String filename = url.getPath(); System.out.println(filename); // /demo/target/classes/name.txt BufferedReader reader = new BufferedReader(new FileReader(filename)); String line ; while ((line = reader.readLine())!= null){ System.out.println(line); } reader.close(); } } /demo/target/classes/ /demo/target/classes/ /demo/target/classes/com/demo/package com.demo; import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; import java.net.URL; public class App { public static void main(String[] args) throws IOException { URL url = App.class.getResource("/name.txt"); String filename = url.getPath(); System.out.println(filename); // /demo/target/classes/name.txt BufferedReader reader = new BufferedReader(new FileReader(filename)); String line ; while ((line = reader.readLine())!= null){ System.out.println(line); } reader.close(); } }
二、读取文件
/demo/src/main/resources/name.txt
Tom Jack Jobs
读取文件内容
package com.demo; import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; import java.net.URL; public class App { public static void main(String[] args) throws IOException { URL url = App.class.getResource("/name.txt"); String filename = url.getPath(); System.out.println(filename); // /demo/target/classes/name.txt BufferedReader reader = new BufferedReader(new FileReader(filename)); String line ; while ((line = reader.readLine())!= null){ System.out.println(line); } reader.close(); } }
输出结果
Tom Jack Jobs • 1 • 2 • 3
参考
