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新蒲京澳门赌场网站:java 常用IO操作



package com.syj.util;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.io.OutputStream;

import java.io.PrintWriter;

import java.io.StringReader;

import java.util.Arrays;

/**

*

* Title:IO对象类

*

*

*

* Description:常用的IO操作封装

*

*

*

* Copyright: 转载请注明出处http://blog.csdn.net/sunyujia/">http://blog.csdn.net/sunyujia/ *

*

* @author 孙钰佳

* @main mailto:sunyujia@yahoo.cn">sunyujia@yahoo.cn * @date Jun 15, 2008 4:37:58 PM

*/

public class IOUtil {

/**

* 缓冲区大年夜小 1MB

*/

private static final int BUFFER_SIZE = 1024 * 1024;

/**

*

* Description: 将输入流输出到输出流

*

* @param in

*输入流

* @param out

*输出流

* @param bufferSize

*缓冲区大年夜小

* @throws IOException

* @mail mailto:sunyujia@yahoo.cn">sunyujia@yahoo.cn * @since:Jun 15, 2008 5:57:24 PM

*/

public static void in2OutStream(InputStream in, 新蒲京澳门赌场网站OutputStream out,

int bufferSize) throws IOException {

byte[] buffer = new byte[bufferSize];// 缓冲区

for (int bytesRead = 0; (bytesRead = in.read(buffer)) != -1;) {

out.write(buffer, 0, bytesRead);

Arrays.fill(buffer, (byte) 0);

}

}

package com.syj.util;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.io.OutputStream;

import java.io.PrintWriter;

import java.io.StringReader;

import java.util.Arrays;

/**

*

* Title:IO对象类

*

*

*

* Description:常用的IO操作封装

*

*

*

* Copyright: 转载请注明出处http://blog.csdn.net/sunyujia/

*

*

* @author 孙钰佳

* @main sunyujia@yahoo.cn

* @date Jun 15, 2008 4:37:58 PM

*/

public class IOUtil {

/**

* 缓冲区大年夜小 1MB

*/

private static final int BUFFER_SIZE = 1024 * 1024;

/**

*

* Description: 将输入流输出到输出流

*

* @param in

*输入流

* @param out

*输出流

* @param bufferSize

*缓冲区大年夜小

* @throws IOException

* @mail sunyujia@yahoo.cn

* @since:Jun 15, 2008 5:57:24 PM

*/

public static void in2OutStream(InputStream in, OutputStream out,

int bufferSize) throws IOException {

byte[] buffer = new byte[bufferSize];// 缓冲区

for (int bytesRead = 0; (bytesRead = in.read(buffer)) != -1;) {

out.write(buffer, 0, bytesRead);

Arrays.fill(buffer, 新蒲京澳门赌场网站(byte) 0);

}

}

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/**

*

* Description: 读取文件返回字节数组流

*

* @param file

*文件

* @return 字节数组流

* @mail mailto:sunyujia@yahoo.cn">sunyujia@yahoo.cn * @since:Jun 15, 2008 4:52:41 PM

*/

public static ByteArrayOutputStream readFileToByteStream(File file)

throws IOException {

FileInputStream fis = null;

ByteArrayOutputStream bos = null;

try {

fis = new FileInputStream(file);

bos = new ByteArrayOutputStream();

in2OutStream(fis, bos, BUFFER_SIZE);

} finally {

if (fis != null)

fis.close();

}

return bos;

}

/**

*

* Description:读取文件返回字节数组

*

* @param file

*文件

* @return 字节数组

* @throws IOException

* @mail mailto:sunyujia@yahoo.cn">sunyujia@yahoo.cn * @since:Jun 15, 2008 5:38:50 PM

*/

public static byte[] readFileToByteArray(File file) throws IOException {

ByteArrayOutputStream bos = null;

try {

bos = readFileToByteStream(file);

} finally {

if (bos != null)

bos.close();

}

return bos.toByteArray();

}

/**

*

* Description:读取文件内容

*

* @param file

*文件

* @return String内容

* @throws IOException

* @mail mailto:sunyujia@yahoo.cn">sunyujia@yahoo.cn * @since:Jun 15, 2008 5:46:32 PM

*/

public static String readFileToString(File file) throws IOException {

StringBuffer sb = null;

BufferedReader in = null;

try {

in = new BufferedReader(new FileReader(file));

sb = new StringBuffer();

for (String line; (line = in.readLine()) != null;) {

sb.append(line + "\r\n");

}

} finally {

if (in != null)

in.close();

}

return sb.toString();

}

/**

*

* Description:复制文件

*

* @param src

*源文件

* @param dest

*目标文件

* @param cover

*是否覆盖

* @throws IOException

* @mail mailto:sunyujia@yahoo.cn">sunyujia@yahoo.cn * @since:Jun 15, 2008 6:08:28 PM

*/

public static void copyFile(File src, File dest, boolean cover)

throws IOException {

/**

*

* Description: 读取文件返回字节数组流

*

* @param file

*文件

* @return 字节数组流

* @mail sunyujia@yahoo.cn

* @since:Jun 15, 2008 4:52:41 PM

*/

public static ByteArrayOutputStream readFileToByteStream(File file)

throws IOException {

FileInputStream fis = null;

ByteArrayOutputStream bos = null;

try {

fis = new FileInputStream(file);

bos = new ByteArrayOutputStream();

in2OutStream(fis, bos, BUFFER_SIZE);

} finally {

if (fis != null)

fis.close();

}

return bos;

}

/**

*

* Description:读取文件返回字节数组

*

* @param file

*文件

* @return 字节数组

* @throws IOException

* @mail sunyujia@yahoo.cn

* @since:Jun 15, 2008 5:38:50 新蒲京澳门赌场网站PM

*/

public static byte[] readFileToByteArray(File file) throws IOException {

ByteArrayOutputStream bos = null;

try {

bos = readFileToByteStream(file);

} finally {

if (bos != null)

bos.close();

}

return bos.toByteArray();

}

/**

*

* Description:读取文件内容

*

* @param file

*文件

* @return String内容

* @throws IOException

* @mail sunyujia@yahoo.cn

* @since:Jun 15, 2008 5:46:32 PM

*/

public static String readFileToString(File file) throws IOException新蒲京澳门赌场网站 {

StringBuffer sb = null;

BufferedReader in = null;

try {

in = new BufferedReader(new FileReader(file));

sb = new StringBuffer();

for (String line; (line = in.readLine()) != null;) {

sb.append(line + "\r\n");

}

} finally {

if (in != null)

in.close();

}

return sb.toString();

}

/**

*

* Description:复制文件

*

* @param src

*源文件

* @param dest

*目标文件

* @param cover

*是否覆盖

* @throws IOException

* @mail sunyujia@yahoo.cn

* @since:Jun 15, 2008 6:08:28 PM

*/

public static void copyFile(File src, File dest, boolean cover)

throws IOException {

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FileInputStream in = null;

FileOutputStream out = null;

try {

if (!dest.exists()) {

dest.createNewFile();

} else if (dest.exists() && cover) {

dest.delete();

dest.createNewFile();

} else {

return;

}

in = new FileInputStream(src);

out = new FileOutputStream(dest);

in2OutStream(in, out, BUFFER_SIZE);

} finally {

try {

if (in != null)

in.close();

} finally {

if (out != null)

out.close();

}

}

}

/**

*

* Description:写文件

*

* @param file

*文件

* @param str

*内容

* @throws IOException

* @mail mailto:sunyujia@yahoo.cn">sunyujia@yahoo.cn * @since:Jun 15, 2008 6:17:24 PM

*/

public static void writeFile(File file, String str) throws IOException {

PrintWriter out = null;

BufferedReader in = null;

try {

if (!file.exists())

file.createNewFile();

in = new BufferedReader(new StringReader(str));

out = new PrintWriter(new BufferedWriter(new FileWriter(file)));

for (String line; (line = in.readLine()) != null;) {

out.println(line);

}

} finally {

try {

if (in != null)

in.close();

} finally {

if (out != null)

out.close();

}

}

}

/**

*

* Description:从节制台读取一串字符串

*

* @return 读取的字符串

* @throws IOException

* @mail mailto:sunyujia@yahoo.cn">sunyujia@yahoo.cn * @since:Jun 15, 2008 6:42:29 PM

*/

public static String readStringFromSystemIn() throws IOException {

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

try {

return br.readLine();

} finally {

if (br != null)

br.close();

}

}

/**

*

* Description:当ObjectInputStream工具调用

* readObject();时,会从ByteArrayInputStream流中反序列化出的工具

*

*

* @param bi

* @return

* @throws IOException

* @mail mailto:sunyujia@yahoo.cn">sunyujia@yahoo.cn * @since:Jun 15, 2008 7:07:53 PM

*/

public static ObjectInputStream buildObjectInputStream(

ByteArrayInputStream bi) throws IOException {

return new ObjectInputStream(bi);

}

/**

*

* Description:当ObjectOutputStream工具调用

* writeObject(o);时,o工具会序列化到ByteArrayOutputStream流中去

*

* @param bos

*字节数组流

* @return 工具输出流

* @throws IOException

* @mail mailto:sunyujia@yahoo.cn">sunyujia@yahoo.cn * @since:Jun 15, 2008 7:06:00 PM

*/

public static ObjectOutputStream buildObjectOutputStream(

ByteArrayOutputStream bos) throws IOException {

return new ObjectOutputStream(bos);

}

public static BufferedReader buildBufferedReader(String str) {

return new BufferedReader(new StringReader(str));

}

public static ByteArrayInputStream buildByteArrayInputStream(String str) {

return new ByteArrayInputStream(str.getBytes());

}

public static ByteArrayInputStream buildByteArrayInputStream(byte[] bt) {

return new ByteArrayInputStream(bt);

}

public static void main(String[] args) throws Exception {

byte[] bootFileBytes = IOUtil.readFileToByteArray(new File(

"C:\\boot.ini"));

System.out.println(new String(bootFileBytes));

String bootFileStr = readFileToString(new File("C:\\boot.ini"));

System.out.println(bootFileStr);

System.out.println(new String(bootFileBytes).equals(bootFileStr));

IOUtil.copyFile(new File("C:\\boot.ini"), new File("C:\\boot1.ini"),

true);

IOUtil.writeFile(new File("C:\\boot2.ini"), bootFileStr);

ByteArrayOutputStream bos = new ByteArrayOutputStream();

ObjectOutputStream oos = IOUtil.buildObjectOutputStream(bos);

oos.writeObject(new String("abcd"));

ObjectInputStream ois = IOUtil.buildObjectInputStream(IOUtil

.buildByteArrayInputStream(bos.toByteArray()));

System.out.println(ois.readObject());

System.ou新蒲京澳门赌场网站t.println(IOUtil.readStringFromSystemIn());

}

}

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