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在Java中创建GUID的最佳方法有哪些？

我是Java新手,对Java中的垃圾收集器感到困惑.它实际上做了什么以及什么时候开始行动.请描述Java中垃圾收集器的一些属性.

在Java中,有一个等同于C#"using"语句,允许为对象定义范围:

using (AwesomeClass hooray = new AwesomeClass())
{
   // Great code
}

我有以下代码处理服务器上的文件上传.但是如何将文件保存到服务器上的特定位置

import gwtupload.server.UploadAction;
import gwtupload.server.exceptions.UploadActionException;

import org.apache.commons.fileupload.FileItem;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Hashtable;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;




/**
 * This is an example of how to use UploadAction class.
 *  
 * This servlet saves all received files in a temporary folder, 
 * and deletes them when the user sends a remove request.
 * 
 * @author Manolo Carrasco Moñino
 *
 */
public class SampleUploadServlet extends UploadAction {

  private static final long serialVersionUID = 1L;

  Hashtable<String, String> receivedContentTypes …