Commons项目中用来处理IO的一些工具类包。    <br />    <p style="line-height:normal;margin-bottom:12pt;" class="MsoNormal"><span>Commons IO is a library of utilities to assist with developing IO functionality. There are four main areas included: <br /> <br />  ●Utility classes - with static methods to perform common tasks <br />  ●Filters - various implementations of file filters <br />  ●Comparators - various implementations of java.util.Comparator for files<br />  ●Streams - useful stream, reader and writer implementations</span></p>    <p></p>    <table style="width:100%;" class="MsoNormalTable" border="1" cellspacing="0" cellpadding="0" width="100%">     <tbody>      <tr>       <td colspan="2"> <p style="line-height:normal;" class="MsoNormal"><strong><span style="font-family:'Times New Roman','serif';font-size:18pt;">Packages</span></strong></p> </td>      </tr>      <tr>       <td width="20%"> <p style="line-height:normal;" class="MsoNormal"><strong><span style="font-family:'Times New Roman','serif';font-size:12pt;"><a href="/misc/goto?guid=4959499953255140806"><span style="color:#0000ff;">org.apache.commons.io</span></a></span></strong></p> </td>       <td> <p style="line-height:normal;" class="MsoNormal"><span style="font-family:'Times New Roman','serif';font-size:12pt;">This package defines utility classes for working with streams, readers, writers and files.</span></p> </td>      </tr>      <tr>       <td width="20%"> <p style="line-height:normal;" class="MsoNormal"><strong><span style="font-family:'Times New Roman','serif';font-size:12pt;"><a href="/misc/goto?guid=4959499953333836232"><span style="color:#0000ff;">org.apache.commons.io.comparator</span></a></span></strong></p> </td>       <td> <p style="line-height:normal;" class="MsoNormal"><span style="font-family:'Times New Roman','serif';font-size:12pt;">This package provides various <a title="class or interface in java.util" href="/misc/goto?guid=4959499953420364957"><span style="font-family:'Courier New';color:#0000ff;font-size:10pt;">Comparator</span></a> implementations for <a title="class or interface in java.io" href="/misc/goto?guid=4959499953498056724"><span style="font-family:'Courier New';color:#0000ff;font-size:10pt;">File</span></a>s.</span></p> </td>      </tr>      <tr>       <td width="20%"> <p style="line-height:normal;" class="MsoNormal"><strong><span style="font-family:'Times New Roman','serif';font-size:12pt;"><a href="/misc/goto?guid=4959499953583571102"><span style="color:#0000ff;">org.apache.commons.io.filefilter</span></a></span></strong></p> </td>       <td> <p style="line-height:normal;" class="MsoNormal"><span style="font-family:'Times New Roman','serif';font-size:12pt;">This package defines an interface (IOFileFilter) that combines both <a title="class or interface in java.io" href="/misc/goto?guid=4959499953667863391"><span style="font-family:'Courier New';color:#0000ff;font-size:10pt;">FileFilter</span></a> and <a title="class or interface in java.io" href="/misc/goto?guid=4959499953739751985"><span style="font-family:'Courier New';color:#0000ff;font-size:10pt;">FilenameFilter</span></a>.</span></p> </td>      </tr>      <tr>       <td width="20%"> <p style="line-height:normal;" class="MsoNormal"><strong><span style="font-family:'Times New Roman','serif';font-size:12pt;"><a href="/misc/goto?guid=4959499953822759343"><span style="color:#0000ff;">org.apache.commons.io.input</span></a></span></strong></p> </td>       <td> <p style="line-height:normal;" class="MsoNormal"><span style="font-family:'Times New Roman','serif';font-size:12pt;">This package provides implementations of input classes, such as </span><span style="font-family:'Courier New';font-size:10pt;">InputStream</span><span style="font-family:'Times New Roman','serif';font-size:12pt;"> and </span><span style="font-family:'Courier New';font-size:10pt;">Reader</span><span style="font-family:'Times New Roman','serif';font-size:12pt;">.</span></p> </td>      </tr>      <tr>       <td width="20%"> <p style="line-height:normal;" class="MsoNormal"><strong><span style="font-family:'Times New Roman','serif';font-size:12pt;"><a href="/misc/goto?guid=4959499953896992894"><span style="color:#0000ff;">org.apache.commons.io.output</span></a></span></strong></p> </td>       <td> <p style="line-height:normal;" class="MsoNormal"><span style="font-family:'Times New Roman','serif';font-size:12pt;">This </span></p> </td>      </tr>     </tbody>    </table>    <br /> 下面是一些示例代码：    <pre class="brush:java; toolbar: true; auto-links: false;">//直接将IO流转成字符串  InputStream in = new URL( "http://jakarta.apache.org" ).openStream();  try {    System.out.println( IOUtils.toString( in ) );  } finally {    IOUtils.closeQuietly(in);  } //读取文本文件的所有行  File file = new File("/commons/io/project.properties");  List lines = FileUtils.readLines(file, "UTF-8"); //路径处理  String filename = "C:/commons/io/../lang/project.xml";  String normalized = FilenameUtils.normalize(filename);  // result is "C:/commons/lang/project.xml" //获取目录空间  long freeSpace = FileSystemUtils.freeSpace("C:/");  //打印文件的所有行  LineIterator it = FileUtils.lineIterator(file, "UTF-8");  try {    while (it.hasNext()) {      String line = it.nextLine();      /// do something with line    }  } finally {    LineIterator.closeQuietly(iterator);  }</pre>    <p><strong>项目主页：</strong><a href="http://www.open-open.com/lib/view/home/1324994173561" target="_blank">http://www.open-open.com/lib/view/home/1324994173561</a></p>