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

作者：羊村懒王 | 2024-03-25 11:57:24

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[java] view plain copy

print ?

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：

[html] view plain copy

print ?

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


// 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：

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print ?

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


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

[java] view plain copy

print ?

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 );
}
}
}

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