IT十八掌作业_java基础第20天_断点续传、屏广软件

感谢大家对IT十八掌大数据的支持，今天的作业如下：

阐述各个项目

------------------------

断点续传

------------------------------------------------

1.引入临时文件，伴随文件。

2.存放下载的数据

3.文件名.tmp

[xxx.tmp]

4.逻辑

if(文件存在?){

if(临时文件存在?){

//没下完

//TODO 读取临时文件，构建下载信息

}

else{

//文件已下载完成

//TODO 删除文件

}

//文件不存在

else{

//TODO 创建文件

//TODO 创建临时文件。

}

5.线程下载过程期间，实时更新info信息.

6.下载完成时删除临时文件。

7.窗口退出的时候

if(下载未完成?){

//TODO 将下载信息存放到临时文件中。

prop.store(os,comment);

}

8.窗口退出时，将infos集合内容构造成Properties对象，存成properties文件。

9.窗口打开是UI的布局恢复成上次的进度。

10.现在线程从服务器中定位新的起始点。

屏广软件

-----------------

1.将某个学生的屏幕分享给所有人。

--------------------------------------------------------------------------------------------------------

项目源码：

package com.it18zhang.downloader;

/**

* 下载信息对象

public class DownloadInfo {

private String url;

private String local;

private int startPos;//起始位置

private int endPos;//结束位置

public DownloadInfo() {

}

public DownloadInfo(String url, String local, int startPos, int endPos) {

this.url = url;

this.local = local;

this.startPos = startPos;

this.endPos = endPos;

}

public String getUrl() {

return url;

}

public void setUrl(String url) {

this.url = url;

}

public String getLocal() {

return local;

}

public void setLocal(String local) {

this.local = local;

}

public int getStartPos() {

return startPos;

}

public void setStartPos(int startPos) {

this.startPos = startPos;

}

public int getEndPos() {

return endPos;

}

public void setEndPos(int endPos) {

this.endPos = endPos;

}

package com.it18zhang.downloader;

import java.io.RandomAccessFile;

import java.net.URL;

import java.util.ArrayList;

import java.util.List;

/**

* 下载管理器

public class DownloadManager {

private String url ;

private String local ;

private int count ;

//文件总长度

private int totalLength ;

private List<DownloadInfo> infos ;

private UI ui ;//ui

/**

* DownloadManager

public DownloadManager(String url, String local, int count,UI ui) {

super();

this.url = url;

this.local = local;

this.count = count;

this.ui = ui ;

//准备下载

prepareDownload();

}

* 准备下载

* 1.提取url文件大小

* 2.创建本地文件

* 3.准备DownloadInfo集合

private void prepareDownload() {

infos = new ArrayList<DownloadInfo>();

try {

//1.提取文件大小

URL url0 = new URL(url);

this.totalLength = url0.openConnection().getContentLength();

//1'.设置ui的进度条的最大值.

ui.setProgressbarMax(totalLength);

//2.创建本地文件

RandomAccessFile raf = new RandomAccessFile(local, "rw");

raf.setLength(totalLength);

raf.close();

//3.准备DownloadInfo集合

int block = totalLength / count;

DownloadInfo info = null ;

for(int i = 0 ; i < count ; i ++){

info = new DownloadInfo();

info.setUrl(url);

info.setLocal(local);

info.setStartPos(i * block);

if(i == (count - 1)){

info.setEndPos(totalLength - 1 );

}

else{

info.setEndPos((i + 1) * block - 1);

}

infos.add(info);

}

catch (Exception e) {

e.printStackTrace();

}

/**

* 开始下载

public void start(){

for(DownloadInfo info : infos){

new DownloadThread(info, ui).start();

}

package com.it18zhang.downloader;

import java.io.InputStream;

import java.io.RandomAccessFile;

import java.net.URL;

import java.net.URLConnection;

/**

* 下载线程

public class DownloadThread extends Thread {

private DownloadInfo info ;

private UI ui ;

public DownloadThread(DownloadInfo info,UI ui) {

this.info = info;

this.ui = ui ;

}

public void run(){

try {

URL url = new URL(info.getUrl());

URLConnection conn = url.openConnection();

//设置header的key-value

conn.setRequestProperty("Range", "bytes=" + info.getStartPos() + "-" + info.getEndPos());

//获取流

InputStream is = conn.getInputStream();

//定位本地文件

RandomAccessFile raf = new RandomAccessFile(info.getLocal(), "rw");

raf.seek(info.getStartPos());

byte[] buf = new byte[1024];

int len = 0 ;

while((len = is.read(buf)) != -1){

while(ui.isPausing){

try {

Thread.sleep(500);

}

catch (Exception e) {

e.printStackTrace();

}

raf.write(buf, 0, len);

//更新进度条

ui.updateProcessBar(len);

}

raf.close();

}

catch (Exception e) {

e.printStackTrace();

}

package com.it18zhang.downloader;

public class StartUI {

public static void main(String[] args) {

new UI();

}

package com.it18zhang.downloader;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import javax.swing.JButton;

import javax.swing.JDialog;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JProgressBar;

import javax.swing.JTextField;

public class UI extends JFrame {

//url

private JLabel lbUrl;

private JTextField tfUrl;

//本地地址

private JLabel lbLocal;

private JTextField tfLocal;

//线程数量

private JLabel lbCount;

private JTextField tfCount;

//按钮

private JButton btnStart;

//暂停

private JButton btnPause ;

//进度条

private JProgressBar bar ;

//是否暂停

public boolean isPausing = false ;

public UI(){

ini();

}

/**

* 初始化

private void ini(){

this.setBounds(0, 0, 600, 400);

this.setLayout(null);

//url 标签

lbUrl = new JLabel("url : ");

lbUrl.setBounds(0, 0, 100, 50);

this.add(lbUrl);

tfUrl = new JTextField("http://localhost:8000/jdk-7u25-linux-x86_64.tar.gz");

tfUrl.setBounds(120, 0, 400, 50);

this.add(tfUrl);

//local地址

lbLocal = new JLabel("local : ");

lbLocal.setBounds(0, 60, 100, 50);

this.add(lbLocal);

tfLocal = new JTextField("d:/xx.tar.gz");

tfLocal.setBounds(120, 60, 400, 50);

this.add(tfLocal);

//count地址

lbCount = new JLabel("Count : ");

lbCount.setBounds(0, 120, 100, 50);

this.add(lbCount);

tfCount = new JTextField("3");

tfCount.setBounds(120, 120, 400, 50);

this.add(tfCount);

//下载按钮

btnStart = new JButton("开始");

btnStart.setBounds(10, 180, 100, 50);

this.add(btnStart);

btnStart.addMouseListener(new MouseAdapter() {

public void mouseClicked(MouseEvent e) {

String url = tfUrl.getText();

String local = tfLocal.getText();

int count = Integer.parseInt(tfCount.getText());

DownloadManager mgr = new DownloadManager(url, local, count, UI.this);

mgr.start();

bar.setVisible(true);

}

});

//暂停

btnPause = new JButton("暂停");

btnPause.setBounds(120, 180, 100, 50);

this.add(btnPause);

btnPause.addMouseListener(new MouseAdapter() {

public void mouseClicked(MouseEvent e) {

UI.this.isPausing = !UI.this.isPausing ;

btnPause.setText(UI.this.isPausing?"继续":"暂停");

}

});

//进度条

bar = new JProgressBar();

bar.setBounds(5, 240, 550,10);

this.add(bar);

this.setDefaultCloseOperation(EXIT_ON_CLOSE);

this.setVisible(true);

}

/**

* 更新进度条

public synchronized void updateProcessBar(int len) {

int newValue = bar.getValue() + len ;

bar.setValue(newValue);

if(newValue >= bar.getMaximum()){

JDialog d = new JDialog();

d.setTitle("下载完成！");

d.setVisible(true);

d.setBounds(400, 300, 200, 100);

bar.setValue(0);

bar.setVisible(false);

}

public void setProgressbarMax(int length) {

bar.setMaximum(length);

}

package com.it18zhang.downloader2;

/**

* 下载信息对象

public class DownloadInfo {

//线程索引编号，主要是对应进度条

private int index ;

private String url;

private String local;

private int startPos;//起始位置

private int endPos;//结束位置

public DownloadInfo() {

}

public DownloadInfo(String url, String local, int startPos, int endPos) {

this.url = url;

this.local = local;

this.startPos = startPos;

this.endPos = endPos;

}

public int getIndex() {

return index;

}

public void setIndex(int index) {

this.index = index;

}

public String getUrl() {

return url;

}

public void setUrl(String url) {

this.url = url;

}

public String getLocal() {

return local;

}

public void setLocal(String local) {

this.local = local;

}

public int getStartPos() {

return startPos;

}

public void setStartPos(int startPos) {

this.startPos = startPos;

}

public int getEndPos() {

return endPos;

}

public void setEndPos(int endPos) {

this.endPos = endPos;

}

package com.it18zhang.downloader2;

import java.io.RandomAccessFile;

import java.net.URL;

import java.util.ArrayList;

import java.util.List;

/**

* 下载管理器

public class DownloadManager {

private String url ;

private String local ;

private int count ;

//文件总长度

private int totalLength ;

private List<DownloadInfo> infos ;

public List<DownloadInfo> getInfos() {

return infos;

}

public void setInfos(List<DownloadInfo> infos) {

this.infos = infos;

}

private UI ui ;//ui

/**

* DownloadManager

public DownloadManager(String url, String local, int count,UI ui) {

super();

this.url = url;

this.local = local;

this.count = count;

this.ui = ui ;

//准备下载

prepareDownload();

}

* 准备下载

* 1.提取url文件大小

* 2.创建本地文件

* 3.准备DownloadInfo集合

private void prepareDownload() {

infos = new ArrayList<DownloadInfo>();

try {

//1.提取文件大小

URL url0 = new URL(url);

this.totalLength = url0.openConnection().getContentLength();

//1'.设置ui的进度条的最大值.

//ui.setProgressbarMax(totalLength);

//2.创建本地文件

RandomAccessFile raf = new RandomAccessFile(local, "rw");

raf.setLength(totalLength);

raf.close();

//3.准备DownloadInfo集合

int block = totalLength / count;

DownloadInfo info = null ;

for(int i = 0 ; i < count ; i ++){

info = new DownloadInfo();

info.setIndex(i);//索引

info.setUrl(url);//url

info.setLocal(local);//local

info.setStartPos(i * block);//startPos

if(i == (count - 1)){

info.setEndPos(totalLength - 1 );

}

else{

info.setEndPos((i + 1) * block - 1);

}

infos.add(info);

}

catch (Exception e) {

e.printStackTrace();

}

/**

* 开始下载

public void start(){

for(DownloadInfo info : infos){

new DownloadThread(info, ui).start();

}

package com.it18zhang.downloader2;

import java.io.InputStream;

import java.io.RandomAccessFile;

import java.net.URL;

import java.net.URLConnection;

/**

* 下载线程

public class DownloadThread extends Thread {

private DownloadInfo info ;

private UI ui ;

public DownloadThread(DownloadInfo info,UI ui) {

this.info = info;

this.ui = ui ;

}

public void run(){

try {

URL url = new URL(info.getUrl());

URLConnection conn = url.openConnection();

//设置header的key-value

conn.setRequestProperty("Range", "bytes=" + info.getStartPos() + "-" + info.getEndPos());

//获取流

InputStream is = conn.getInputStream();

//定位本地文件

RandomAccessFile raf = new RandomAccessFile(info.getLocal(), "rw");

raf.seek(info.getStartPos());

byte[] buf = new byte[1024];

int len = 0 ;

while((len = is.read(buf)) != -1){

while(ui.isPausing){

try {

Thread.sleep(500);

}

catch (Exception e) {

e.printStackTrace();

}

raf.write(buf, 0, len);

//更新进度条

ui.updateProcessBar(len,info.getIndex());

}

raf.close();

}

catch (Exception e) {

e.printStackTrace();

}

package com.it18zhang.downloader2;

public class StartUI {

public static void main(String[] args) {

new UI();

}

package com.it18zhang.downloader2;

import java.awt.Component;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.util.List;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JProgressBar;

import javax.swing.JTextField;

public class UI extends JFrame {

//url

private JLabel lbUrl;

private JTextField tfUrl;

//本地地址

private JLabel lbLocal;

private JTextField tfLocal;

//线程数量

private JLabel lbCount;

private JTextField tfCount;

//按钮

private JButton btnStart;

//暂停

private JButton btnPause ;

//进度条数组

private JProgressBar[] bars ;

//是否暂停

public boolean isPausing = false ;

//已经完成任务的线程数

private int completeCount = 0;

public UI(){

ini();

}

/**

* 初始化

private void ini(){

this.setBounds(0, 0, 600, 400);

this.setLayout(null);

//url 标签

lbUrl = new JLabel("url : ");

lbUrl.setBounds(0, 0, 100, 50);

this.add(lbUrl);

tfUrl = new JTextField("http://localhost:8000/jdk-7u25-linux-x86_64.tar.gz");

tfUrl.setBounds(120, 0, 400, 50);

this.add(tfUrl);

//local地址

lbLocal = new JLabel("local : ");

lbLocal.setBounds(0, 60, 100, 50);

this.add(lbLocal);

tfLocal = new JTextField("d:/xx.tar.gz");

tfLocal.setBounds(120, 60, 400, 50);

this.add(tfLocal);

//count地址

lbCount = new JLabel("Count : ");

lbCount.setBounds(0, 120, 100, 50);

this.add(lbCount);

tfCount = new JTextField("3");

tfCount.setBounds(120, 120, 400, 50);

this.add(tfCount);

//下载按钮

btnStart = new JButton("开始");

btnStart.setBounds(10, 180, 100, 50);

this.add(btnStart);

btnStart.addMouseListener(new MouseAdapter() {

public void mouseClicked(MouseEvent e) {

String url = tfUrl.getText();

String local = tfLocal.getText();

int count = Integer.parseInt(tfCount.getText());

DownloadManager mgr = new DownloadManager(url, local, count, UI.this);

//动态添加进度条

addBars(mgr.getInfos());

mgr.start();

}

});

//暂停

btnPause = new JButton("暂停");

btnPause.setBounds(120, 180, 100, 50);

this.add(btnPause);

btnPause.addMouseListener(new MouseAdapter() {

public void mouseClicked(MouseEvent e) {

UI.this.isPausing = !UI.this.isPausing ;

btnPause.setText(UI.this.isPausing?"继续":"暂停");

}

});

this.setDefaultCloseOperation(EXIT_ON_CLOSE);

this.setVisible(true);

}

/**

* 动态添加进度条

protected void addBars(List<DownloadInfo> infos) {

bars = new JProgressBar[infos.size()];

int y = 250 ;

for(int i = 0 ; i < infos.size() ; i ++){

DownloadInfo info = infos.get(i);

bars[i] = new JProgressBar();

bars[i].setMaximum(info.getEndPos() - info.getStartPos() + 1);//设置最大值

bars[i].setBounds(10, y + (i * 25), 400, 20);

this.add(bars[i]);

}

this.repaint();

}

/**

* 更新进度条

* @param indx

public void updateProcessBar(int len, int index) {

int newValue = bars[index].getValue() + len ;

bars[index].setValue(newValue);

if(newValue >= bars[index].getMaximum()){

completeCount ++ ;

if(completeCount >= bars.length){

//处理完成

processFinish();

}

/**

* 处理完成

private void processFinish() {

for(Component cmp : bars){

this.remove(cmp);

}

this.repaint();

}

package com.it18zhang.downloader3;

/**

* 下载信息对象

public class DownloadInfo {

//线程索引编号，主要是对应进度条

private int index ;

private String url;

private String local;

private int startPos;//起始位置

private int endPos;//结束位置

private int amount ;//已经下载的数据量

public DownloadInfo() {

}

public DownloadInfo(String url, String local, int startPos, int endPos) {

this.url = url;

this.local = local;

this.startPos = startPos;

this.endPos = endPos;

}

public int getIndex() {

return index;

}

public void setIndex(int index) {

this.index = index;

}

public String getUrl() {

return url;

}

public void setUrl(String url) {

this.url = url;

}

public String getLocal() {

return local;

}

public void setLocal(String local) {

this.local = local;

}

public int getStartPos() {

return startPos;

}

public void setStartPos(int startPos) {

this.startPos = startPos;

}

public int getEndPos() {

return endPos;

}

public void setEndPos(int endPos) {

this.endPos = endPos;

}

public int getAmount() {

return amount;

}

public void setAmount(int amount) {

this.amount = amount;

}

package com.it18zhang.downloader3;

import java.io.File;

import java.io.FileInputStream;

import java.io.RandomAccessFile;

import java.net.URL;

import java.util.ArrayList;

import java.util.List;

import java.util.Properties;

/**

* 下载管理器

public class DownloadManager {

private String url ;

private String local ;

private int count ;

//文件总长度

private int totalLength ;

private List<DownloadInfo> infos ;

public List<DownloadInfo> getInfos() {

return infos;

}

public void setInfos(List<DownloadInfo> infos) {

this.infos = infos;

}

private UI ui ;//ui

/**

* DownloadManager

public DownloadManager(String url, String local, int count,UI ui) {

super();

this.url = url;

this.local = local;

this.count = count;

this.ui = ui ;

//准备下载

prepareDownload();

}

* 准备下载

* 1.提取url文件大小

* 2.创建本地文件

* 3.准备DownloadInfo集合

private void prepareDownload() {

infos = new ArrayList<DownloadInfo>();

try {

//0.判断下载文件是否存在

File file = new File(local);

if(file.exists()){

File metaFile = new File(local + ".tmp");

//是否存在

if(metaFile.exists()){

this.infos = readInfosFromFile(metaFile);

}

//1.提取文件大小

URL url0 = new URL(url);

this.totalLength = url0.openConnection().getContentLength();

//2.创建本地文件

RandomAccessFile raf = new RandomAccessFile(local, "rw");

raf.setLength(totalLength);

raf.close();

//3.准备DownloadInfo集合

int block = totalLength / count;

DownloadInfo info = null ;

for(int i = 0 ; i < count ; i ++){

info = new DownloadInfo();

info.setIndex(i);//索引

info.setUrl(url);//url

info.setLocal(local);//local

info.setStartPos(i * block);//startPos

if(i == (count - 1)){

info.setEndPos(totalLength - 1 );

}

else{

info.setEndPos((i + 1) * block - 1);

}

infos.add(info);

}

catch (Exception e) {

e.printStackTrace();

}

/**

* 从元文件读取下载信息

private List<DownloadInfo> readInfosFromFile(File metaFile) {

List<DownloadInfo> infos = new ArrayList<DownloadInfo>();

try {

//Hashtable子类

Properties prop = new Properties();

prop.load(new FileInputStream(metaFile));

String url = prop.getProperty("url");

int count = Integer.parseInt(prop.getProperty("count"));

DownloadInfo info = null ;

for(int i = 0 ; i < count ; i ++){

String value = prop.getProperty("thread." + i);

//arr[0]=startPos arr[1] arr[2]

String[] arr = value.split(";");

info = new DownloadInfo();

info.setIndex(i);

info.setUrl(url);

info.setStartPos(Integer.parseInt(arr[0]));

info.setEndPos(Integer.parseInt(arr[1]));

info.setAmount(Integer.parseInt(arr[2]));

String path = metaFile.getAbsolutePath() ;

path = path.substring(0, path.lastIndexOf("."));

info.setLocal(path);

infos.add(info);

}

catch (Exception e) {

e.printStackTrace();

}

return null;

}

/**

* 开始下载

public void start(){

for(DownloadInfo info : infos){

new DownloadThread(info, ui).start();

}

package com.it18zhang.downloader3;

import java.io.InputStream;

import java.io.RandomAccessFile;

import java.net.URL;

import java.net.URLConnection;

/**

* 下载线程

public class DownloadThread extends Thread {

private DownloadInfo info ;

private UI ui ;

public DownloadThread(DownloadInfo info,UI ui) {

this.info = info;

this.ui = ui ;

}

public void run(){

try {

URL url = new URL(info.getUrl());

URLConnection conn = url.openConnection();

//设置header的key-value

conn.setRequestProperty("Range", "bytes=" + info.getStartPos() + "-" + info.getEndPos());

//获取流

InputStream is = conn.getInputStream();

//定位本地文件

RandomAccessFile raf = new RandomAccessFile(info.getLocal(), "rw");

raf.seek(info.getStartPos());

byte[] buf = new byte[1024];

int len = 0 ;

while((len = is.read(buf)) != -1){

while(ui.isPausing){

try {

Thread.sleep(500);

}

catch (Exception e) {

e.printStackTrace();

}

//1.写入文件

raf.write(buf, 0, len);

//2.更新进度条

ui.updateProcessBar(len,info.getIndex());

//3.更新下载信息

info.setAmount(info.getAmount() + len);

}

raf.close();

}

catch (Exception e) {

e.printStackTrace();

}

package com.it18zhang.downloader3;

public class StartUI {

public static void main(String[] args) {

new UI();

}

package com.it18zhang.downloader3;

import java.io.FileInputStream;

import java.util.Properties;

public class TestApp {

public static void main(String[] args) throws Exception {

Properties prop = new Properties();

prop.load(new FileInputStream("d:/conf.properties"));

for(Object key : prop.keySet()){

Object value = prop.get(key);

System.out.println(key + "=" + value);

}

package com.it18zhang.downloader3;

import java.awt.Component;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.util.List;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JProgressBar;

import javax.swing.JTextField;

public class UI extends JFrame {

//url

private JLabel lbUrl;

private JTextField tfUrl;

//本地地址

private JLabel lbLocal;

private JTextField tfLocal;

//线程数量

private JLabel lbCount;

private JTextField tfCount;

//按钮

private JButton btnStart;

//暂停

private JButton btnPause ;

//进度条数组

private JProgressBar[] bars ;

//是否暂停

public boolean isPausing = false ;

//已经完成任务的线程数

private int completeCount = 0;

public UI(){

ini();

}

/**

* 初始化

private void ini(){

this.setBounds(0, 0, 600, 400);

this.setLayout(null);

//url 标签

lbUrl = new JLabel("url : ");

lbUrl.setBounds(0, 0, 100, 50);

this.add(lbUrl);

tfUrl = new JTextField("http://localhost:8000/jdk-7u25-linux-x86_64.tar.gz");

tfUrl.setBounds(120, 0, 400, 50);

this.add(tfUrl);

//local地址

lbLocal = new JLabel("local : ");

lbLocal.setBounds(0, 60, 100, 50);

this.add(lbLocal);

tfLocal = new JTextField("d:/xx.tar.gz");

tfLocal.setBounds(120, 60, 400, 50);

this.add(tfLocal);

//count地址

lbCount = new JLabel("Count : ");

lbCount.setBounds(0, 120, 100, 50);

this.add(lbCount);

tfCount = new JTextField("3");

tfCount.setBounds(120, 120, 400, 50);

this.add(tfCount);

//下载按钮

btnStart = new JButton("开始");

btnStart.setBounds(10, 180, 100, 50);

this.add(btnStart);

btnStart.addMouseListener(new MouseAdapter() {

public void mouseClicked(MouseEvent e) {

String url = tfUrl.getText();

String local = tfLocal.getText();

int count = Integer.parseInt(tfCount.getText());

DownloadManager mgr = new DownloadManager(url, local, count, UI.this);

//动态添加进度条

addBars(mgr.getInfos());

mgr.start();

}

});

//暂停

btnPause = new JButton("暂停");

btnPause.setBounds(120, 180, 100, 50);

this.add(btnPause);

btnPause.addMouseListener(new MouseAdapter() {

public void mouseClicked(MouseEvent e) {

UI.this.isPausing = !UI.this.isPausing ;

btnPause.setText(UI.this.isPausing?"继续":"暂停");

}

});

this.setDefaultCloseOperation(EXIT_ON_CLOSE);

this.setVisible(true);

}

/**

* 动态添加进度条

protected void addBars(List<DownloadInfo> infos) {

bars = new JProgressBar[infos.size()];

int y = 250 ;

for(int i = 0 ; i < infos.size() ; i ++){

DownloadInfo info = infos.get(i);

bars[i] = new JProgressBar();

bars[i].setMaximum(info.getEndPos() - info.getStartPos() + 1);//设置最大值

bars[i].setBounds(10, y + (i * 25), 400, 20);

this.add(bars[i]);

}

this.repaint();

}

/**

* 更新进度条

* @param indx

public void updateProcessBar(int len, int index) {

int newValue = bars[index].getValue() + len ;

bars[index].setValue(newValue);

if(newValue >= bars[index].getMaximum()){

completeCount ++ ;

if(completeCount >= bars.length){

//处理完成

processFinish();

}

/**

* 处理完成

private void processFinish() {

for(Component cmp : bars){

this.remove(cmp);

}

this.repaint();

}

package com.it18zhang.urldemo;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.net.URL;

import java.net.URLConnection;

public class TestApp {

public static void main(String[] args) throws Exception {

String urlStr = "http://localhost:8000/jdk-7u25-linux-x86_64.tar.gz";

URL url = new URL(urlStr);

URLConnection conn = url.openConnection();

String type = conn.getContentType();

int length = conn.getContentLength();

System.out.println(type + " : " + length);

InputStream is = conn.getInputStream();

FileOutputStream fos = new FileOutputStream("d:/jdk.gz");

byte[] buf = new byte[1024];

int len = 0 ;

while((len = is.read(buf)) != -1){

fos.write(buf, 0, len);

}

fos.close();

is.close();

}

更多相关文章

随机推荐