转载自 使用org.apache.commons.io.FileUtils,IOUtils;工具类操作文件

File src = new File("G:/2012/portal/login.jsp");  
File tar = new File("G:/2012/portal/loginZs.jsp");  
File tarDir = new File("G:/2012/portal/center/");  FileUtils.copyFile(src,tar);//复制文件  
FileUtils.copyFileToDirectory(src, tarDir);//复制文件到指定文件夹  

 

File src = new File("G:/2012/portal/login.jsp");  
File tar = new File("G:/2012/portal/loginZs.jsp");  
File tarDir = new File("G:/2012/portal/center/");  FileUtils.copyFile(src,tar);//复制文件  
FileUtils.copyFileToDirectory(src, tarDir);//复制文件到指定文件夹

 

Commons IO是apache的一个开源的工具包,封装了IO操作的相关类,使用Commons IO可以很方便的读写文件,

 

FileUtils 中提供了许多设计文件操作的 已封装好的方法。

IOUtils 则是提供了读写文件的方法。

 

读取文件：

// by FileUtils    
List<String> lines = FileUtils.readLines(file, "UTF-8");    // by IOUtils    
List<String> lines = IOUtils.readLines(new FileInputStream(file), "UTF-8"); 

写入文件：

// by FileUtils    
FileUtils.writeLines(file, "UTF-8", lines);    // by IOUtils    
IOUtils.writeLines(lines, null, new FileOutputStream(file));    

public class IoTest {    /**  * @param args  */    public static void main(String[] args) throws Exception {    // 输入流复制到 输出流   Writer write = new FileWriter("c:\\kk.dat");    InputStream ins = new FileInputStream(new File("c:\\text.txt"));    IOUtils.copy(ins, write);    write.close();    ins.close();    //文本写入指定文件   String name = "my name is panxiuyan";    File file =  new File("c:\\name.txt");    FileUtils.writeStringToFile(file, name);    //将输入流转换成文本   URL url = new URL("http://www.dimurmill.com");    InputStream ins = url.openStream();    String contents = IOUtils.toString(ins,"UTF-8");    System.out.println( "Slashdot: " + contents );    //关闭相关流  File file = null;    InputStream ins = null;    try{    file = new File("C:\\Test.java");    ins = new FileInputStream(file);    }catch(Exception e){    e.printStackTrace();    }finally{    IOUtils.closeQuietly(ins);    }    }  //文件复制  File srcfile = new File("c:\\Test.java");      File destfile = new File("c:\\Test.java.bak");      FileUtils.copyFile(srcfile, destfile);      //文件复制指定的目录   File srcfile = new File("c:\\Test.java");      File destDir = new File("D:\\");    FileUtils.copyFileToDirectory(srcfile, destDir);    //网络流保存为文件  URL url = new URL("http://www.163.com");     File file = new File("c:\\163.html");        FileUtils.copyURLToFile(url, file);    //文件目录操作   File dir = new File("c:\\test");    FileUtils.cleanDirectory(dir);//清空目录下的文件    FileUtils.deleteDirectory(dir);//删除目录和目录下的文件   //目录大小    long size = FileUtils.sizeOfDirectory(dir);    //目录操作  File testFile = new File( "testFile.txt" );    //如果不存在,新建    // 如果存在,修改文件修改时间    FileUtils.touch( testFile );    //记录流的读取写入字节数   File test = new File( "test.dat" );    //输出流的统计    CountingOutputStream countStream = null;    //输入流的统计    //CountingInputStream countStream = null;    try {    FileOutputStream fos = new FileOutputStream( test );            countStream = new CountingOutputStream( fos );    countStream.write( "Hello".getBytes( ) );    } catch( IOException ioe ) {    System.out.println( "Error writing bytes to file." );    } finally {         IOUtils.closeQuietly( countStream );      }    if( countStream != null ) {    int bytesWritten = countStream.getCount( );    System.out.println( "Wrote " + bytesWritten + " bytes to test.dat" );    }    //相同的内容写入不同的文本   File test1 = new File("split1.txt");    File test2 = new File("split2.txt");    OutputStream outStream = null;    try {    FileOutputStream fos1 = new FileOutputStream( test1 );    FileOutputStream fos2 = new FileOutputStream( test2 );    //包含不同的文本    outStream = new TeeOutputStream( fos1, fos2 );    outStream.write( "One Two Three, Test".getBytes( ) );    outStream.flush( );         } catch( IOException ioe ) {        System.out.println( "Error writing to split output stream" );           } finally {             IOUtils.closeQuietly( outStream );              }   }    }