gistfile1.txt /* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */package cn.huawei.com.CompressedSeacher.util;i
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package cn.huawei.com.CompressedSeacher.util;
import cn.huawei.com.CompressedSeacher.view.com.impl.FileListTableImpl;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.FileChannel.MapMode;
import java.util.Date;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* **
*
* @author l00358914
*/
public class FileUtils {
private static FileUtils instance = new FileUtils();
private FileUtils() {
}
public static FileUtils getInstance() {
return instance;
}
private static StringBuffer sb = new StringBuffer();
/**
* 将文本文件中的内容读入到buffer中
*
* @param buffer buffer
* @param filePath 文件路径
* @throws IOException 异常
* @author cn.outofmemory
*
*/
public static void readToBuffer(StringBuffer buffer, String filePath) throws IOException {
InputStream is = new FileInputStream(filePath);
String line; // 用来保存每行读取的内容
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
line = reader.readLine(); // 读取第一行
while (line != null) { // 如果 line 为空说明读完了
buffer.append(line); // 将读到的内容添加到 buffer 中
buffer.append("\n"); // 添加换行符
line = reader.readLine(); // 读取下一行
}
reader.close();
is.close();
}
/**
* 读取文本文件内容
*
* @param filePath 文件所在路径
* @return 文本内容
* @throws IOException 异常
* @author cn.outofmemory
*
*/
public static String readFile(String filePath) throws IOException {
StringBuffer sb = new StringBuffer();
FileUtils.readToBuffer(sb, filePath);
return sb.toString();
}
public static void fileChannelCopy(File s, File t) {
FileInputStream fi = null;
FileOutputStream fo = null;
FileChannel in = null;
FileChannel out = null;
try {
fi = new FileInputStream(s);
fo = new FileOutputStream(t);
in = fi.getChannel();//得到对应的文件通道
out = fo.getChannel();//得到对应的文件通道
in.transferTo(0, in.size(), out);//连接两个通道，并且从in通道读取，然后写入out通道
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
fi.close();
in.close();
fo.close();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* **
* java IO方式
*
* @param f1
* @param f2
* @return
* @throws Exception
*/
public static long copyFile_IO(File f1, File f2) throws Exception {
long time = new Date().getTime();
int length = 2097152;
FileInputStream in = new FileInputStream(f1);
FileOutputStream out = new FileOutputStream(f2);
byte[] buffer = new byte[length];
while (true) {
int ins = in.read(buffer);
if (ins == -1) {
in.close();
out.flush();
out.close();
return new Date().getTime() - time;
} else {
out.write(buffer, 0, ins);
}
}
}
/**
* **
* 使用NIO中的管道到管道传输
*
* @param f1
* @param f2
* @return
* @throws Exception
*/
public static long copyFile_NIO2Channel(File f1, File f2) throws Exception {
long time = new Date().getTime();
int length = 2097152;
FileInputStream in = new FileInputStream(f1);
FileOutputStream out = new FileOutputStream(f2);
FileChannel inC = in.getChannel();
FileChannel outC = out.getChannel();
int i = 0;
while (true) {
if (inC.position() == inC.size()) {
inC.close();
outC.close();
return new Date().getTime() - time;
}
if ((inC.size() - inC.position()) < 20971520) {
length = (int) (inC.size() - inC.position());
} else {
length = 20971520;
}
inC.transferTo(inC.position(), length, outC);
inC.position(inC.position() + length);
i++;
}
}
/****
*
*
* @param f1
* @param f2
* @return
* @throws Exception
*/
public static long copyFile_memoryImage(File f1, File f2) throws Exception {
long time = new Date().getTime();
int length = 2097152;
FileInputStream in = new FileInputStream(f1);
RandomAccessFile out = new RandomAccessFile(f2, "rw");
FileChannel inC = in.getChannel();
MappedByteBuffer outC = null;
MappedByteBuffer inbuffer = null;
byte[] b = new byte[length];
while (true) {
if (inC.position() == inC.size()) {
inC.close();
outC.force();
out.close();
return new Date().getTime() - time;
}
if ((inC.size() - inC.position()) < length) {
length = (int) (inC.size() - inC.position());
} else {
length = 20971520;
}
b = new byte[length];
inbuffer = inC.map(MapMode.READ_ONLY, inC.position(), length);
inbuffer.load();
inbuffer.get(b);
outC = out.getChannel().map(MapMode.READ_WRITE, inC.position(), length);
inC.position(b.length + inC.position());
outC.put(b);
outC.force();
}
}
/**
* **
* 管道对管道
*
* @param f1
* @param f2
* @return
* @throws Exception
*/
public static long copyFile_Channel2Channel(File f1, File f2) throws Exception {
long time = new Date().getTime();
int length = 2097152;
FileInputStream in = new FileInputStream(f1);
FileOutputStream out = new FileOutputStream(f2);
FileChannel inC = in.getChannel();
FileChannel outC = out.getChannel();
ByteBuffer b = null;
while (true) {
if (inC.position() == inC.size()) {
inC.close();
outC.close();
return new Date().getTime() - time;
}
if ((inC.size() - inC.position()) < length) {
length = (int) (inC.size() - inC.position());
} else {
length = 2097152;
}
b = ByteBuffer.allocateDirect(length);
inC.read(b);
b.flip();
outC.write(b);
outC.force(false);
}
}
/**
* 循环创建父目录，正则表达式方式
*
* @param outFileName
*/
public static void createFatherDir(String outFileName) {
// 匹配分隔符
Pattern p = Pattern.compile("[/\\" + File.separator + "]");
Matcher m = p.matcher(outFileName);
// 每找到一个匹配的分隔符，则创建一个该分隔符以前的目录
while (m.find()) {
int index = m.start();
String subDir = outFileName.substring(0, index);
File subDirFile = new File(subDir);
if (!subDirFile.exists()) {
subDirFile.mkdir();
System.out.println("目录创建完成:" + subDir);
}
}
}
public static void main(String[] args) {
try {
createFatherDir("D:\\decompileFolder\\tomcat-websocket.src\\META-INF\\test\\huawei\\web-fragment.xml");
fileChannelCopy(new File("D:\\decompileFolder\\tomcat-websocket.jar\\META-INF\\web-fragment.xml"), new File("D:\\decompileFolder\\tomcat-websocket.src\\META-INF\\test\\huawei\\web-fragment.xml"));
// copyFile_NIO2Channel(new File("D:\\decompileFolder\\tomcat-websocket.jar\\META-INF/web-fragment.xml"),new File("D:\\decompileFolder\\tomcat-websocket.src\\META-INF/web-fragment.xml"));
// copyFile_memoryImage(new File("D:\\decompileFolder\\tomcat-websocket.jar\\META-INF/web-fragment.xml"),new File("D:\\decompileFolder\\tomcat-websocket.src\\META-INF/web-fragment.xml"));
// copyFile_Channel2Channel(new File("D:\\decompileFolder\\tomcat-websocket.jar\\META-INF/web-fragment.xml"),new File("D:\\decompileFolder\\tomcat-websocket.src\\META-INF/web-fragment.xml"));
} catch (Exception ex) {
Logger.getLogger(FileUtils.class.getName()).log(Level.SEVERE, null, ex);
}
}
}