commons-io jar包用法

//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);
 }