读取网络流获取文件大小

来源：互联网发布：2016中国人工智能大会编辑：程序博客网时间：2024/04/30 21:24

package uxsino;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.text.DecimalFormat;

//http://www.runoob.com/wp-content/themes/runoob/assets/img/newlogo.png
//http://test.pi-brand.com/jeesite/userfiles/1/images/cms/product/2016/12/product_logo_0.png

public class Main {
public static int getStrByUrlConnection(String spec) {
int result = 0;
try {
URL url = new URL(spec);
URLConnection urlConnection = url.openConnection();
urlConnection.setDoInput(true);
InputStream inputStream = urlConnection.getInputStream();
result = stream2Str(inputStream);
} catch (IOException e) {
return 0;
}
return result;
}

private static int stream2Str(InputStream inputStream) {
byte[] buf = new byte[1024];
int len = -1;
int size = 0;
try {
while ((len = inputStream.read(buf)) != -1) {
size += len;
}
} catch (IOException e) {
return 0;
}
System.out.println(formetFileSize(size));
return size;
}

public static String formetFileSize(long fileS) {
DecimalFormat df = new DecimalFormat("#.00");
String fileSizeString = "";
if (fileS < 1024) {
fileSizeString = df.format((double) fileS) + "B";
} else if (fileS < 1048576) {
fileSizeString = df.format((double) fileS / 1024) + "K";
} else if (fileS < 1073741824) {
fileSizeString = df.format((double) fileS / 1048576) + "M";
} else {
fileSizeString = df.format((double) fileS / 1073741824) + "G";
}
return fileSizeString;
}

public static void main(String[] args) {
getStrByUrlConnection("http://down.liangchan.net/EXCEL2003.zip");
}
}

package uxsino;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.text.DecimalFormat;

public class News {
public static void downloadNet(String path) throws MalformedURLException {
// 下载网络文件
long bytesum = 0;
long byteread = 0;

URL url = new URL(path);

try {
URLConnection conn = url.openConnection();
InputStream inStream = conn.getInputStream();

byte[] buffer = new byte[1024];
while ((byteread = inStream.read(buffer)) != -1) {
bytesum += byteread;
}
System.out.println(formetFileSize(bytesum));
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args) throws MalformedURLException {
downloadNet("http://down.liangchan.net/EXCEL2003.zip");
}

public static String formetFileSize(long fileS) {
DecimalFormat df = new DecimalFormat("#.00");
String fileSizeString = "";
if (fileS < 1024) {
fileSizeString = df.format((double) fileS) + "B";
} else if (fileS < 1048576) {
fileSizeString = df.format((double) fileS / 1024) + "K";
} else if (fileS < 1073741824) {
fileSizeString = df.format((double) fileS / 1048576) + "M";
} else {
fileSizeString = df.format((double) fileS / 1073741824) + "G";
}
return fileSizeString;
}
}

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