使用java实现http多线程下载

======================== BUILD OUTPUT DESCRIPTION ======================== When you build an Java application project that has a main class, the IDE automatically copies all of the JAR files on the projects classpath to your projects dist/lib folder. The IDE also adds each of the JAR files to the Class-Path element in the application JAR files manifest file (MANIFEST.MF). To run the project from the command line, go to the dist folder and type the following: java -jar "QSDown.jar" To distribute this project, zip up the dist folder (including the lib folder) and distribute the ZIP file. Notes: * If two JAR files on the project classpath have the same name, only the first JAR file is copied to the lib folder. * Only JAR files are copied to the lib folder. If the classpath contains other types of files or folders, none of the classpath elements are copied to the lib folder. In such a case, you need to copy the classpath elements to the lib folder manually after the build. * If a library on the projects classpath also has a Class-Path element specified in the manifest,the content of the Class-Path element has to be on the projects runtime path. * To set a main class in a standard Java project, right-click the project node in the Projects window and choose Properties. Then click Run and enter the class name in the Main Class field. Alternatively, you can manually type the class name in the manifest Main-Class element.