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[英]aws lambda java : How to set the class path while compiling on the fly
[英]To generate Java Class on Fly and add to class path
我正在运行中生成一个Java类,并尝试对其调用方法。 为此,似乎我必须执行以下操作
我该如何实现?
我使其与JavaCompiler和Custom类加载器一起工作,如下所示。
private Path compileSource(Path javaFile, String contractFileNameWithoutExtension) {
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
compiler.run(null, null, null, javaFile.toFile().getAbsolutePath());
return javaFile.getParent().resolve(contractFileNameWithoutExtension+".class");
}
public Class findClass(String name) {
String filePath = sourceCodeLocation +"/"+ name.replace(".", "/")+".class";
byte[] b = loadClassFromFile(filePath);
return defineClass(name, b, 0, b.length);
}
private byte[] loadClassFromFile(String fileName) {
try {
InputStream inputStream = FileUtils.getFileInputStream.apply(fileName);
byte[] buffer;
ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
int nextValue = 0;
try {
while ((nextValue = inputStream.read()) != -1) {
byteStream.write(nextValue);
}
} catch (IOException e) {
e.printStackTrace();
}
buffer = byteStream.toByteArray();
return buffer;
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
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