Java在eclipse中读取文本文件

Question

我正在尝试读取不同包中但在同一项目中可用的文本文件，但总是将 InputStream 设为 null。

public class ReadFileApp {

    public static void main(String[] args) {

        Thread currentThread = Thread.currentThread();
        ClassLoader classLoader = currentThread.getContextClassLoader();
        InputStream inputStream = classLoader.getResourceAsStream("/com/rpsoft/response/fileOneResponse.txt");

        String response = null;
        try {
            response = new String(FileCopyUtils.copyToByteArray(inputStream));
        } catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println("Current Thread : " + currentThread);
        System.out.println("Class Loader : " + classLoader);
        System.out.println("InputStream : "+ inputStream);
        System.out.println("Response : " + response);
    }
}

获取异常:

Exception in thread "main" java.lang.IllegalArgumentException: No InputStream specified
    at org.springframework.util.Assert.notNull(Assert.java:112)
    at org.springframework.util.FileCopyUtils.copy(FileCopyUtils.java:106)
    at org.springframework.util.FileCopyUtils.copyToByteArray(FileCopyUtils.java:156)
    at com.rpsoft.filetransport.ReadFileApp.main(ReadFileApp.java:18)

Answer 1

您可以根据项目中的文件位置尝试任何一种。

// Read from same package 
getClass().getResourceAsStream("fileOneResponse.txt")

// Read from resources folder parallel to src in your project
new File("resources/fileOneResponse.txt")

// Read from src/resources folder
getClass().getResource("/resources/fileOneResponse.txt")

// Read from src/resources folder
getClass().getResourceAsStream("/resources/fileOneResponse.txt")