我将如何读取打包的文件？

Question

I have a file that I packaged in my JAR file, but I can't figure out how I would read the text file and store it into a String variable. Any ideas anyone?

Answer 1

I would recommend

java.lang.Class#getResource(java.lang.String) or java.lang.Class#getResourceAsStream(java.lang.String)

Answer 2

This approach would work for any jar file, even if it's not in your current project/library/classpath:

String myJarFilename ="C:\\path\\to\\myfile.jar";
JarFile jarFile = new JarFile(myJarFilename);
JarEntry jarEntry = jarFile.getJarEntry("mytextfile.txt");

if (jarEntry != null)
{
    InputStream is = jarFile.getInputStream(jarEntry);
    // do normal stuff here to read string from inputstream

    InputStreamReader isr = new InputStreamReader(is);
    byte[] charArr = new byte[2048];
    int bytesRead = 0;
    StringBuffer sb = new StringBuffer();
    while (bytesRead = is.read(charArr, 0, 2048) > 0)
    {
        sb.append(charArr, 0, bytesRead);            
    }
    String fileContent = sb.toString();
}

Answer 3

您可以使用URLClassLoader来访问JAR存档中的资源。