Java读取远程文件[Http,ftp]，并保存

最新推荐文章于 2022-10-04 12:40:13 发布

转载最新推荐文章于 2022-10-04 12:40:13 发布 · 1.5k 阅读

文章标签：

#java #string #templates #url #buffer #exception

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本文介绍了一个简单的Java程序，通过使用URL、HttpURLConnection、DataInputStream和DataOutputStream来下载网络图片，并将其保存到本地文件系统。该程序能够处理HTTP和FTP协议，包括错误处理和文件操作。

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import java.net.*;
import java.io.*;
/*
* Created on 2007-6-1
*
* TODO To change the template for this generated file go to
* Window - Preferences - Java - Code Style - Code Templates
*/

/**
* @author howard
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/
public class TestUrl {

public boolean saveUrlAs(String photoUrl, String fileName) {
     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) {
      System.out.println(e);
      return false;
     }
    }
    /**
     * 兼容HTTP和FTP协议
     * @param urlString
     * @return
     */
    public String getDocumentAt(String urlString) {
     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();
    }

    /**
     *
     * @param args
     */
    public static void main(String[] args) {
     TestUrl test = new TestUrl();
     String photoUrl = "http://www.zhplc.com/468x60.gif";
     String fileName = photoUrl.substring(photoUrl.lastIndexOf("/"));
     String filePath = "c:\\";
     boolean flag = test.saveUrlAs(photoUrl, filePath + fileName);
     System.out.println("Run ok!\n Get URL file " + flag);
    }

}