Java中获取项目路径下的文件的方法大全

项目路径示例

项目的resources文件夹下
     mytxt文件里面
      文件名叫fileTest.txt

getResourceAsStream

 String filePath = "/mytxt/fileTest.txt";
 InputStream inputStream = FileUtil.class.getResourceAsStream(filePath);

getResource+getPath

String filePath = "/mytxt/fileTest.txt";
String path = FileUtil.class.getResource(filePath).getPath();
InputStream fileInputStream = new FileInputStream(path);

getClassLoader().getResourceAsStream
文件路径path初始不带 / 杠

String filePath = "mytxt/fileTest.txt";
InputStream inputStream = FileUtil.class.getClassLoader().getResourceAsStream(filePath);

Thread.currentThread().getContextClassLoader().getResource
此种方式文件路径path初始不带 / 杠

String filePath = "mytxt/fileTest.txt";       
String path = Thread.currentThread().getContextClassLoader().
getResource(filePath ).getPath();
        InputStream fileInputStream = new FileInputStream(path);

System.getProperty
项目根路径
然后拼接target/classes及文件路径

String filePath = "/mytxt/fileTest.txt";
String relativelyPath = System.getProperty("user.dir");

InputStream fileInputStream = new FileInputStream(relativelyPath + "/target/classes/" + filePath);

Paths.get("").toAbsolutePath()
先拿项目根路径
再拼接target/classes及文件路径

String filePath = "/mytxt/fileTest.txt"; 
Path path = Paths.get("").toAbsolutePath();      
InputStream fileInputStream = new FileInputStream(path + "/target/classes/" + filePath);