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

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 );              
            }   
         }    
    
}