简介：FileUtil是专为Java开发者设计的一款高效实用的文件操作工具类库，提供了一系列便捷的方法来处理常见的文件系统任务。
package com.hexiang.utils;
import java.io.*;
/**
* FileUtil. Simple file operation class.
*
*/
public class FileUtil {
/**
* The buffer.
*/
protected static byte buf[] = new byte[1024];
/**
* Read content from local file.
*
* @param fileName - local file name to read
* @return
* @throws Exception
*/
public static String readFileAsString(String fileName) throws Exception {
String content = new String(readFileBinary(fileName));
return content;
}
/**
* 读取文件并返回为给定字符集的字符串.
*
* @param fileName
* @param encoding
* @return
* @throws Exception
*/
public static String readFileAsString(String fileName, String encoding) throws Exception {
String content = new String(readFileBinary(fileName), encoding);
return content;
}
/**
* 读取文件并返回为给定字符集的字符串.
*
* @param in
* @return
* @throws Exception
*/
public static String readFileAsString(InputStream in) throws Exception {
String content = new String(readFileBinary(in));
return content;
}
/**
* Read content from local file to binary byte array.
*
* @param fileName - local file name to read
* @return
* @throws Exception
*/
public static byte[] readFileBinary(String fileName) throws Exception {
FileInputStream fin = new FileInputStream(fileName);
return readFileBinary(fin);
}
/**
* 从输入流读取数据为二进制字节数组.
*
* @param streamIn
* @return
* @throws IOException
*/
public static byte[] readFileBinary(InputStream streamIn) throws IOException {
BufferedInputStream in = new BufferedInputStream(streamIn);
ByteArrayOutputStream out = new ByteArrayOutputStream(10240);
int len;
while ((len = in.read(buf)) >= 0)
out.write(buf, 0, len);
in.close();
return out.toByteArray();
}
/**
* Write string content to local file.
*
* @param fileName - local file name will write to
* @param content String text
* @return true if success
* @throws IOException
*/
public static boolean writeFileString(String fileName, String content) throws IOException {
FileWriter fout = new FileWriter(fileName);
fout.write(content);
fout.close();
return true;
}
/**
* Write string content to local file using given character encoding.
*
* @param fileName - local file name will write to
* @param content String text
* @param encoding the encoding
* @return true if success
* @throws IOException
*/
public static boolean writeFileString(String fileName, String content, String encoding) throws IOException {
OutputStreamWriter fout = new OutputStreamWriter(new FileOutputStream(fileName), encoding);
fout.write(content);
fout.close();
return true;
}
/**
* Write binary byte array to local file.
*
* @param fileName - local file name will write to
* @param content binary byte array
* @return true if success
* @throws IOException
*/
public static boolean writeFileBinary(String fileName, byte[] content) throws IOException {
FileOutputStream fout = new FileOutputStream(fileName);
fout.write(content);
fout.close();
return true;
}
/**
* 检查文件名是否合法. 文件名字不能包含字符\/:*?<>|
*
* @param fileName 文件名,不包含路径
* @return boolean is valid file name
*/
public static boolean isValidFileName(String fileName) {
boolean isValid = true;
String errChar = \\/:*?\<>|;
// if (fileName == null || fileName.length() == 0) {
isValid = false;
} else {
for (int i = 0; i < errChar.length(); i++) {
if (fileName.indexOf(errChar.charAt(i)) != -1) {
isValid = false;
break;
}
}
}
return isValid;
}
/**
* 把非法文件名转换为合法文件名.
*
* @param fileName
* @return
*/
public static String replaceInvalidFileChars(String fileName) {
StringBuffer out = new StringBuffer();
for (int i = 0; i < fileName.length(); i++) {
char ch = fileName.charAt(i);
// Replace invlid chars: \\/:*?\<>|
switch (ch) {
case \\:
case /:
case ::
case *:
case ?:
case \:
case <:
case >:
out
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