工具类一共6个:
org.apache.commons.io.filefilter.FileFilterUtils
org.apache.commons.io.
- EndianUtils
- FilenameUtils
- FileSystemUtils
- FileUtils
- IOUtils
普通地读取一个网页的源代码的代码可能如下
InputStream in = new URL( "http://laoyu.info" ).openStream(); try { InputStreamReader inR = new InputStreamReader( in ); BufferedReader buf = new BufferedReader( inR ); String line; while ( ( line = buf.readLine() ) != null ) { System.out.println( line ); } } finally { in.close(); }
使用了Commons IO,则可以大大简化代码.如下:
InputStream in = new URL( "http://laoyu.info" ).openStream(); try { System.out.println( IOUtils.toString( in ) ); } finally { IOUtils.closeQuietly(in); }
Commons IO里的常用类
FileUtils包含了文件操作的相关方法.
下面的代码用于读取磁盘上的某个文件:
File file = new File("c:/test.txt"); List lines = FileUtils.readLines(file, "UTF-8");
FileSystemUtils 可以获得指定磁盘路径的可用空间
long freeSpace = FileSystemUtils.freeSpace("d:/");
文件复制代码:
File src = new File("src.txt"); File dest = new File("dest.txt"); FileUtils.copyFile(src, dest);
方便地下载文件到本地
InputStream in = new URL("http://www.baidu.com/img/baidu_logo.gif").openStream(); byte [] gif = IOUtils.toByteArray(in); //IOUtils.write(gif,new FileOutputStream(new File("c:/test.gif"))); FileUtils.writeByteArrayToFile(new File("c:/test.gif"),gif); IOUtils.closeQuietly(in);
时间: 2024-10-20 14:06:30