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從URL獲取文件保存到本地的代碼

<% @page? import = " java.net.*,java.io.* " %>

<%!

?? public ? boolean ?saveUrlAs(String?photoUrl,?String?fileName)? {

// 此方法只能用戶HTTP協(xié)議

???? try ? {

??????URL?url? = ? new ?URL(photoUrl);

??????HttpURLConnection?connection? = ?(HttpURLConnection)?url.openConnection();

??????DataInputStream?in? = ? new ?DataInputStream(connection.getInputStream());

??????DataOutputStream?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);

??????}

??????out.close();

??????in.close();

?????? return ? true ;

????}

???? catch ?(Exception?e)? {

?????? return ? false ;

????}

??}

public ?String?getDocumentAt(String?urlString)? {

// 此方法兼容HTTP和FTP協(xié)議

????StringBuffer?document? = ? new ?StringBuffer();

???? try ? {

??????URL?url? = ? new ?URL(urlString);

??????URLConnection?conn? = ?url.openConnection();

??????BufferedReader?reader? = ? new ?BufferedReader( new ?InputStreamReader(conn.

??????????getInputStream()));

??????String?line? = ? null ;

?????? while ?(?(line? = ?reader.readLine())? != ? null )? {

????????document.append(line? + ? " \n " );

??????}

??????reader.close();

????}

???? catch ?(MalformedURLException?e)? {

??????System.out.println( " Unable?to?connect?to?URL:? " ? + ?urlString);

????}

???? catch ?(IOException?e)? {

??????System.out.println( " IOException?when?connecting?to?URL:? " ? + ?urlString);

????}

???? return ?document.toString();

??}

// 測試

??String?photoUrl? = ? " http://ad4.sina.com.cn/200601/12/43932_750450.jpg " ;

??String?fileName? = ?photoUrl.substring(photoUrl.lastIndexOf( " / " ));

??String?filePath? = ? " d:/ghost/ " ;

?? boolean ?flag? = ?saveUrlAs(photoUrl,?filePath? + ?fileName);

??out.println( " Run?ok!\n<BR>Get?URL?file? " ? + ?flag);

posted on 2006-04-04 17:09 Q系列類、方法、變量…… 閱讀(325) 評論(0) 編輯收藏所屬分類: 網(wǎng)上工具代碼

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