java 文件操作工具

package com.test.io;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

/**
* IO工具
*
*/
public class IOUtil {

/**
* 新建文件
*
* @param path
*            文件所在路径
* @param filename
*            文件名
* @param overWrite
*            是否强制覆盖
* @return 文件全路径
* @throws IOException
*/
public static String createFile(String path, String filename,
boolean overWrite) throws IOException {
File file = new File(path, filename);
if (file.exists()) {
try {
if (file.isDirectory()) {
throw new Exception("创建的文件和已有目录重名");
}
} catch (Exception e) {
return null;
}
if (overWrite) {
file.delete();
file.createNewFile();
}
} else {
file.createNewFile();
}
return file.getPath();
}

/**
* 新建目录
*
* @param path
*            目录所在路径
* @param dirName
*            目录名
* @return 目录全路径
*/
public static String createDir(String path, String dirName) {
File dir = new File(path, dirName);
if (dir.exists()) {
try {
if (dir.isFile()) {
throw new Exception("创建的目录和已有文件重名");
}
} catch (Exception e) {
return null;
}
} else {
dir.mkdirs();
}
return dir.getPath();
}

/**
* 拷贝
*
* @param src
*            源文件（文件夹）
* @param dest
*            目标文件夹
* @param overWrite
*            强制覆盖
* @return 未拷贝文件名
* @throws IOException
*/
public static String copy(String src, String dest, boolean overWrite)
throws IOException {
File srcFile = new File(src);
File destFile = new File(dest);
StringBuffer unCopyFiles = new StringBuffer();
if (!destFile.exists() || destFile.isFile()) {
throw new IOException("目标路径不是一个有效路径");
}
if (srcFile.isFile()) {
try {
copyFile(srcFile, dest, overWrite);
} catch (Exception e) {
unCopyFiles.append(srcFile.getPath());
unCopyFiles.append(";");
}
} else {
try {
dest = copyDir(srcFile, dest);
} catch (Exception e) {
unCopyFiles.append(srcFile.getPath());
unCopyFiles.append(";");
}
File[] files = srcFile.listFiles();
for (int i = 0; i < files.length; i++) {
String temp = copy(files[i].getPath(), dest, overWrite);
if (temp != null && !temp.isEmpty()) {
unCopyFiles.append(temp);
unCopyFiles.append(";");
}
}
}
return unCopyFiles.toString();
}

/**
* 剪切
*
* @param src
*            源文件（文件夹）
* @param dest
*            目标文件夹
* @param overWrite
*            强制覆盖
* @return 未剪切文件
* @throws IOException
*/
public static String cut(String src, String dest, boolean overWrite)
throws IOException {
File srcFile = new File(src);
File destFile = new File(dest);
String unCutaFiles = null;
if (!destFile.exists() || destFile.isFile()) {
throw new IOException("目标路径不是一个有效路径");
}
if (srcFile.isFile()) {
try {
copyFile(srcFile, dest, overWrite);
srcFile.delete();
} catch (Exception e) {
unCutaFiles += srcFile.getPath() + ";";
}
} else {
try {
dest = copyDir(srcFile, dest);

} catch (Exception e) {
unCutaFiles += srcFile.getPath() + ";";
}
File[] files = srcFile.listFiles();
for (int i = 0; i < files.length; i++) {
String temp = cut(files[i].getPath(), dest, overWrite);
if (temp != null) {
unCutaFiles += temp + ";";
}
files[i].delete();
}
srcFile.delete();
}
return unCutaFiles;
}

/**
* 删除
*
* @param path
*            文件（文件夹）全路径
*/
public static void delete(String path) {
File file = new File(path);
if (file.exists()) {
if (file.isDirectory()) {
File[] tmp = file.listFiles();
for (int i = 0; i < tmp.length; i++) {
delete(tmp[i].getPath());
}
file.delete();
} else {
file.delete();
}

}
}

/**
* 读取文件内容
*
* @param path
*            文件名
* @return 文件内容字符串
* @throws IOException
*/
public static String read(String path) throws IOException {
File file = new File(path);
if (!file.exists() || file.isDirectory())
throw new FileNotFoundException();
FileInputStream fis = new FileInputStream(file);
byte[] buf = new byte[1024];
StringBuffer sb = new StringBuffer();
while ((fis.read(buf)) != -1) {
sb.append(new String(buf));
buf = new byte[1024];// 重新生成，避免和上次读取的数据重复
}
return sb.toString();
}

/**
* 把内容写入文件
*
* @param path
*            文件名
* @param sb
*            写入内容
* @param encoding
*            编码方式（默认为UTF-8）
* @throws IOException
*/
public static void write(String path, StringBuffer sb, String encoding)
throws IOException {
if (sb == null || sb.length() < 1)
return;
File file = new File(path);
if (encoding == null)
encoding = "utf-8";
if (file.exists()) {
FileOutputStream out = new FileOutputStream(file, true);
byte[] bytes = sb.toString().getBytes(encoding);
out.write(bytes);
out.close();
} else {
throw new FileNotFoundException();
}
}

private static void copyFile(File srcFile, String dest, boolean overWrite)
throws Exception {

String fileName = srcFile.getName();
File file = new File(dest, fileName);

if (file.exists()) {
if (file.isDirectory()) {
throw new Exception("拷贝的文件和已有目录重名");
}
if (overWrite) {
file.delete();
file.createNewFile();
}
} else {
file.createNewFile();
}
FileInputStream in = new FileInputStream(srcFile);
FileOutputStream out = new FileOutputStream(file);

int c;
byte buffer[] = new byte[1024];
while ((c = in.read(buffer)) != -1) {
for (int i = 0; i < c; i++)
out.write(buffer[i]);
}
in.close();
out.close();

}

private static String copyDir(File srcDir, String dest) throws Exception {
String dirName = srcDir.getName();
File file = new File(dest, dirName);
if (file.exists()) {
if (file.isFile()) {
throw new Exception("拷贝的目录和已有文件重名");
}
} else {
file.mkdirs();
}
return file.getPath();
}

}