從子項目Spring的資源文件夾中讀取txt文件

Question

我正在嘗試從子項目sample-dfx-sbi中讀取文件

文件位於src / main / resources文件夾內

確切的文件位置是src / main / resources / wm / device.txt

我正在使用以下邏輯讀取文件

static final ClassLoader loader = DummyClass.class.getClassLoader();

public void getData(String ip)throws IOException {

    String filepath = loader.getResource("/wm/device.txt").toString();
    System.out.println(filepath);
    File file = new File(filepath);

    FileReader fileReader = new FileReader(file);  // exception

    ...

例外：

jar:file:/home/user/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/sample-dfx-web/WEB-INF/lib/sample-dfx-sbi-0.0.1-SNAPSHOT.jar!/wm/device.txt

java.io.FileNotFoundException: jar:file:/home/user/workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/sample-dfx-web/WEB-INF/lib/sample-dfx-sbi-0.0.1-SNAPSHOT.jar!/wm/device.txt (No such file or directory)
    at java.io.FileInputStream.open0(Native Method)
    at java.io.FileInputStream.open(FileInputStream.java:195)
    at java.io.FileInputStream.<init>(FileInputStream.java:138)

當我轉到工作空間內的上述位置並提取jar文件時，我可以看到wm / device.txt

那為什么不加載文件呢？

Answer 1

在JAR中綁定資源時，將其作為流讀取。

public String loadResource(String filelocation) {
    if (filelocation != null && !filelocation.trim().isEmpty()) {
        try (
            InputStream inputStream = getClass().getResourceAsStream(filelocation);
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));) {

            String fileLine = "";
            StringBuffer stringBuffer = new StringBuffer();

            while((fileLine = bufferedReader.readLine())!= null){
                stringBuffer.append(fileLine);
            }
            return stringBuffer.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    return null;
}