文件名称：Java文件处理工具类--FileUtil
文件大小：2KB
文件格式：RAR
更新时间：2013-02-03 12:26:33
java,file,文件处理,文件写入，文件读取,文件处理
package com.hexiang.utils; import java.io.*; /** * FileUtil. Simple file operation class. * * @author BeanSoft * */ public class FileUtil { /** * The buffer. */ protected static byte buf[] = new byte[1024]; /** * Read content from local file. FIXME How to judge UTF-8 and GBK, the * correct code should be: FileReader fr = new FileReader(new * InputStreamReader(fileName, "ENCODING")); Might let the user select the * encoding would be a better idea. While reading UTF-8 files, the content * is bad when saved out. * * @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 fileName * @param encoding * @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 '>': case '|': out.append('_'); break; default: out.append(ch); } } return out.toString(); } /** * Convert a given file name to a URL(URI) string. * * @param fileName - * the file to parse * @return - URL string */ public static String filePathToURL(String fileName) { String fileUrl = new File(fileName).toURI().toString(); return fileUrl; } /** * 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 appendFileString(String fileName, String content) throws IOException { OutputStreamWriter fout = new OutputStreamWriter(new FileOutputStream( fileName, true), "GBK"); fout.write(content); fout.close(); return true; } public static void main(String[] args) { System.out.println(replaceInvalidFileChars("http://www.abc.com/")); } }
【文件预览】：
FileUtil.java