Question

我正在编写一个java程序，它接受我生成的.class文件和Jars，然后使用类加载器将它们加载到内存中。

我目前有一个工作的jarring系统，代码为：

var model = {
    cats: [
        {
            name: "Fossie",
            url: "",
            count: 0
        },
        {
            name: "Bootsie",
            url: "",
            count: 0
        }
    ], 
    currentCatIndex: 0,
    getCurrentCat: function() {
        return this.cats[this.currentCatIndex];
    }
}
console.log(model.getCurrentCat());

引用代码中的内容：

 public static int BUFFER_SIZE = 10240;
  protected static void createJarArchive(File archiveFile, File[] tobeJared) {
    try {
      byte buffer[] = new byte[BUFFER_SIZE];
      // Open archive file
      FileOutputStream stream = new FileOutputStream(archiveFile);
      JarOutputStream out = new JarOutputStream(stream, new Manifest());

      for (int i = 0; i < tobeJared.length; i++) {
        if (tobeJared[i] == null || !tobeJared[i].exists()
            || tobeJared[i].isDirectory())
          continue; // Just in case...
        System.out.println("Adding " + tobeJared[i].getName());

        // Add archive entry
        JarEntry jarAdd = new JarEntry(getPackageNameModified +tobeJared[i].getName());
        jarAdd.setTime(tobeJared[i].lastModified());
        out.putNextEntry(jarAdd);

        // Write file to archive
        FileInputStream in = new FileInputStream(tobeJared[i]);
        while (true) {
          int nRead = in.read(buffer, 0, buffer.length);
          if (nRead <= 0)
            break;
          out.write(buffer, 0, nRead);
        }
        in.close();
      }

      out.close();
      stream.close();
      System.out.println("Adding completed OK");
    } catch (Exception ex) {
      ex.printStackTrace();
      System.out.println("Error: " + ex.getMessage());
    }
  }

但是，当我将jar加载到内存中时，我收到错误：

getPackageNameModified = com\Test

我正在使用一个squoop类加载器来执行此操作。

AKA：

Could not load jar C:\Users\Dalton\AppData\Local\Temp\Test.jar into JVM. (Could not find class com.Test.ObjectFactory.)

使用以下命令行，类加载器代码正常工作，但我想避免在java程序中使用命令行：

ClassLoaderStack.addJarFile(jarFileAbsolute, absoluteClass);

Answer 1

以下解决了我的问题：

try
    {
        byte buffer[] = new byte[BUFFER_SIZE];
        // Open archive file
        FileOutputStream stream = new FileOutputStream(archiveFile);
        JarOutputStream out = new JarOutputStream(stream, new Manifest());

        for (int i = 0; i < tobeJared.length; i++)
        {
            if (tobeJared[i].toString().endsWith(CLASS))
            { 
                // the .replace \\ with / is a java JDK bug that requires all
                    // paths to use / and end in / for a jar to properly be made

                LOG.info("Adding "
                        + getPackageNameModified().replace(
                                DOUBLE_BACKSLASH, FORWARD_SLASH) + FORWARD_SLASH + tobeJared[i].getName()
                        + " to the temporary JAR.");

                // Add archive entry
                JarEntry jarAdd = new JarEntry(
                        getPackageNameModified().replace(DOUBLE_BACKSLASH,
                                FORWARD_SLASH) + FORWARD_SLASH + tobeJared[i].getName());
                jarAdd.setTime(tobeJared[i].lastModified());
                out.putNextEntry(jarAdd);

                // Write file to archive
                FileInputStream in = new FileInputStream(tobeJared[i]);
                while (true)
                {
                    int nRead = in.read(buffer, 0, buffer.length);
                    if (nRead <= 0) break;
                    out.write(buffer, 0, nRead);
                }
                in.close();
            }
        }

        out.close();
        stream.close();
        LOG.info("Adding complete --> Success");
    }
    catch (Exception ex)
    {
        ex.printStackTrace();
        LOG.error("Error: " + ex.getMessage());
    }

问题是在java中\是一个bug。所有目录拆分使用/替换，并以/结尾。我不知道为什么会出现这个问题，但由于这个原因，生成的JAR可以加载类。

Java代码相当于jar cf

1 个答案: