java.awt.Desktop 简介

摘自api

The 

Desktop

 class
allows a Java application to launch associated applications registered on the native desktop to handle a 

URI

 or
a file.

//使用系统中的关联应用程序来打开特定的文件（或者URI）

Supported operations include://支持的操作包括
launching the user-default browser to show a specified URI; //使用默认浏览器打开URI
launching the user-default mail client with an optional 

mailto

 URI;//使用默认邮件客户端打开任意的mailto地址（optional：任意的）
launching a registered application to open, edit or print a specified file.//使用关联的应用程序来打开、编辑或打印文件

This class provides methods corresponding to these operations. The methods look for the associated application registered on the current platform, and launch it to handle a URI or file. If there is no associated application or the associated application fails
to be launched, an exception is thrown.

//假如没有关联的应用程序或者不能打开关联应用程序，会抛出exception

An application is registered to a URI or file type; for example, the 

"sxi"

 file extension is typically registered to StarOffice. The mechanism
of registering, accessing, and launching the associated application is platform-dependent.//关联应用程序会根据平台不同而不同

Each operation is an action type represented by the 

Desktop.Action

 class.

Note: when some action is invoked and the associated application is executed, it will be executed on the same system as the one on which the Java application was launched. //调用的应用程序会运行在在java应该程序所运行的系统之上

ps:URL是一种具体的URI