MyEclipse+MySql日程管理系统

package Test; import java.io.RandomAccessFile; import java.io.File; //import java.io.InputStream; import java.io.DataInputStream; import java.io.BufferedInputStream; //import java.io.FileInputStream; import java.net.HttpURLConnection; //import java.net.ConnectException; import java.net.URL; import java.lang.Runnable; import java.lang.Thread; import java.util.Date; public class TestUpDown implements Runnable { private HttpURLConnection connection;// 存储连接 private int downsize = -1;// 下载文件大小,初始值为-1 private int downed = 0;// 文加已下载大小,初始值为0 private RandomAccessFile savefile;// 记录下载信息存储文件 private URL fileurl;// 记录要下载文件的地址 private DataInputStream fileStream;// 记录下载的数据流 public TestUpDown() { try { /* 开始创建下载的存储文件,并初始化值 */ File tempfileobject = new File("e:\\11.pdf"); if (!tempfileobject.exists()) { /* 文件不存在则建立 */ tempfileobject.createNewFile(); } savefile = new RandomAccessFile(tempfileobject, "rw"); /* 建立连接 */ fileurl = new URL( "http://www.computerapplications.com.cn/CN/article/downloadArticleFile.do?attachType=PDF&id=11182"); connection = (HttpURLConnection) fileurl.openConnection(); connection.setRequestProperty("Range", "byte=" + this.downed + "-"); this.downsize = connection.getContentLength(); // System.out.println(connection.getContentLength()); new Thread(this).start(); } catch (Exception e) { System.out.println(e.toString()); System.out.println("构建器错误"); System.exit(0); } } public void run() { /* 开始下载文件,以下测试非断点续传,下载的文件存在问题 */ try { System.out.println("begin!"); Date begintime = new Date(); begintime.setTime(new Date().getTime()); byte[] filebyte; int onecelen; // System.out.println(this.connection.getInputStream().getClass().getName()); this.fileStream = new DataInputStream(new BufferedInputStream( this.connection.getInputStream())); System.out.println("size = " + this.downsize); while (this.downsize != this.downed) { if (this.downsize - this.downed > 262144) {// 设置为最大256KB的缓存 filebyte = new byte[262144]; onecelen = 262144; } else { filebyte = new byte[this.downsize - this.downed]; onecelen = this.downsize - this.downed; } onecelen = this.fileStream.read(filebyte, 0, onecelen); this.savefile.write(filebyte, 0, onecelen); this.downed += onecelen; System.out.println(this.downed); } this.savefile.close(); System.out.println("end!"); System.out.println(begintime.getTime()); System.out.println(new Date().getTime()); System.out.println(begintime.getTime() - new Date().getTime()); } catch (Exception e) { System.out.println(e.toString()); System.out.println("run()方法有问题!"); } } public static void main(String[] src) throws Exception { new TestUpDown(); } }