java IO流下个程序在网站下载东西

public static void saveUrlAs(String Url, File fileName){

//此方法只能用HTTP协议

//保存文件到本地

//Url是文件下载地址,fileName 为一个全名(路径+文件名)文件

URL url

DataOutputStream out = null

DataInputStream in = null

try {

url = new URL(Url)

HttpURLConnection connection = (HttpURLConnection) url.openConnection()

in = new DataInputStream(connection.getInputStream())

out = new DataOutputStream(new FileOutputStream(fileName))

byte[] buffer = new byte[4096]

int count = 0

while ((count = in.read(buffer)) >0) {

out.write(buffer, 0, count)

}

}catch (Exception e) {

e.printStackTrace()

}finally{

try {

if(out != null){

out.close()

}

if(in != null){

in.close()

}

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace()

}

}

}

java用输入输出流读取文件的时候应该没有关闭输入输出流，这样的话文件就会一直被占用， 重启后肯定就可以再次访问了。 一般java中io *** 作：

InputStream is = null

try{

一些io *** 作

}catch(){}finally{

is.close()

}

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