File操作
来源：互联网 发布：java程序设计实训学校 编辑：程序博客网 时间：2024/05/16 09:11
package com.pantosoft.edu.utils;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import javax.servlet.http.HttpServletRequest;
import org.apache.log4j.Logger;
import com.pantosoft.edu.constants.Constants;
public class FileUtil {
private static Logger logger = Logger.getLogger("FileUtil");
public static byte[] readFileToByteArray(File f) {
try {
BufferedInputStream bin = new BufferedInputStream(
new FileInputStream(f));
ByteArrayOutputStream bout = new ByteArrayOutputStream();
byte[] buffer = new byte[4096];
while (true) {
int readCount = bin.read(buffer);
if (readCount == -1)
break;
bout.write(buffer, 0, readCount);
}
bout.flush();
bout.close();
bin.close();
return bout.toByteArray();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 创建指定目录
* @param dir
*/
public static void mkDir(String dir) {
File file = new File(dir);
if (!file.isDirectory())
;
file.mkdir();
}
/**
* 是否存在该文件
* @param strFile
* @return
*/
public static boolean isExistFile(String strFile) {
File file = new File(strFile);
if (file.exists() && file.isFile())
return true;
return false;
}
/**
* 是否存在该目录
* @param strDir
* @return
*/
public static boolean isExistDir(String strDir) {
File file = new File(strDir);
if (file.exists() && file.isDirectory())
return true;
return false;
}
/**
* 删除目录下的所有文件及子目录
* @param dir
*/
public static void delFiles(String dir) {
File files = new File(dir);
if (!files.exists()) {
return;
}
File[] file = files.listFiles();
for (int i = 0; i < file.length; i++) {
String delDir = dir + File.separator + file[i].getName();
File delFileDir = new File(delDir);
if (delFileDir.exists() && delFileDir.isDirectory()) {
delFiles(delDir);
}
file[i].delete();
}
}
/**
* 删除文件
* @param dir
* @param fileName
*/
public static void delFile(String dir, String fileName) {
String fileNamePath = dir + File.separator + fileName;
delFile(fileNamePath);
}
/**
*
* @param path
*/
public static void delFile(String path) {
File delFile = new File(path);
if (delFile.exists() && delFile.isFile()) {
delFile.delete();
}
}
public static String readContent(String dir, String fileName) {
String pathName = dir + File.separator + fileName;
File file = new File(pathName);
String content = "";
if (!file.exists()) {
if (logger.isInfoEnabled())
logger.error("文件不存在 路径：" + pathName);
return content;
}
try {
BufferedReader in = new BufferedReader(new InputStreamReader(
new FileInputStream(pathName)));
String s = new String();
while ((s = in.readLine()) != null)
content = content + s + "\n";
in.close();
return content;
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
if (logger.isInfoEnabled())
logger.error("文件未找到 路径：" + pathName + " 信息：" + e.getMessage());
return "";
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
if (logger.isInfoEnabled())
logger.error("文件读写发生错误 路径：" + pathName + " 信息："
+ e.getMessage());
return "";
}
}
/**
* copy 源目录下的到所有文件到目标目录下
* @param sourceDir 源目录
* @param targetDir 目标目录
*/
public static void copyFiles(String sourceDir, String targetDir) {
File sourceFiles = new File(sourceDir);
String[] fileNames = sourceFiles.list();
if (fileNames == null || fileNames.length == 0) {
if (logger.isInfoEnabled())
logger.error("源目录 不存在：" + sourceDir);
return;
}
for (int i = 0; i < fileNames.length; i++) {
String srcName = sourceDir + File.separator + fileNames[i];
File srcFileDir = new File(srcName);
if (srcFileDir.isDirectory()) {
String targetName = targetDir + File.separator + fileNames[i];
File targetFileDir = new File(targetName);
if (!targetFileDir.exists() || !targetFileDir.isDirectory()) {
targetFileDir.mkdir();
}
copyFiles(srcName, targetName);
continue;
}
String targetName = targetDir + File.separator + fileNames[i];
readWriteFile(srcName, targetName);
}
}
/**
*
* @param sourceName 源文件全路径
* @param targetName 目标文件全路径
*/
public static void readWriteFile(String sourceName, String targetName) {
try {
File srcFile = new File(sourceName);
File targetFile = new File(targetName);
if (!srcFile.exists() || !srcFile.isFile()) {
srcFile.createNewFile();
}
if (!targetFile.exists() || !targetFile.isFile()) {
targetFile.createNewFile();
}
InputStream in = new FileInputStream(srcFile);
OutputStream os = new FileOutputStream(targetFile);
readWriteFile(in, os);
} catch (FileNotFoundException e) {
e.printStackTrace();
if (logger.isInfoEnabled())
logger.error("文件未找到 源文件路径：" + sourceName + " 目标文件路径:"
+ targetName + " 信息：" + e.getMessage());
// TODO Auto-generated catch block
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
if (logger.isInfoEnabled())
logger.error("文件未找到 源文件路径：" + sourceName + " 目标文件路径:"
+ targetName + " 信息：" + e.getMessage());
}
}
/**
*
* @param in
* @param targetName 目标文件全路径
*/
public static void readWriteFile(InputStream in, String targetName) {
try {
File targetFile = new File(targetName);
if (!targetFile.exists() || !targetFile.isFile()) {
targetFile.createNewFile();
}
OutputStream os = new FileOutputStream(targetFile);
readWriteFile(in, os);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
if (logger.isInfoEnabled())
logger.error("文件未找到 目标文件路径:" + targetName + " 信息："
+ e.getMessage());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
if (logger.isInfoEnabled())
logger.error("文件发生读写错误 目标文件路径:" + targetName + " 信息："
+ e.getMessage());
}
}
/**
*
* @param in
* @param targetName
*/
public static void readWriteFile(byte[] in, String targetName) {
try {
File targetFile = new File(targetName);
if (!targetFile.exists() || !targetFile.isFile()) {
targetFile.createNewFile();
}
OutputStream os = new FileOutputStream(targetFile);
os.write(in);
os.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
if (logger.isInfoEnabled())
logger.error("文件未找到 目标文件路径:" + targetName + " 信息："
+ e.getMessage());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
if (logger.isInfoEnabled())
logger.error("文件发生读写错误 目标文件路径:" + targetName + " 信息："
+ e.getMessage());
}
}
/**
*
* @param sourceName
* @param os
*/
public static void readWriteFile(String sourceName, OutputStream os) {
try {
File srcFile = new File(sourceName);
if (!srcFile.exists() || !srcFile.isFile()) {
srcFile.createNewFile();
}
InputStream in = new FileInputStream(srcFile);
readWriteFile(in, os);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
if (logger.isInfoEnabled())
logger.error("文件未找到 源文件路径:" + sourceName + " 信息："
+ e.getMessage());
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
if (logger.isInfoEnabled())
logger.error("文件发生读写错误 源文件路径:" + sourceName + " 信息："
+ e.getMessage());
}
}
/**
*
* @param in
* @param os
*/
public static void readWriteFile(InputStream in, OutputStream os) {
try {
int bytesRead = 0;
byte[] buffer = new byte[8192];
while ((bytesRead = in.read(buffer, 0, 8192)) != -1) {
os.write(buffer, 0, bytesRead);//将文件写入服务器
}
os.flush();
os.close();
in.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* 文件上传
* @param is
* @param filepath
* @param filename
* @throws IOException
*/
public static void uploadFile(InputStream is, String filepath,
String filename) throws IOException {
OutputStream os;
try {
String file = filepath + filename;
os = new FileOutputStream(file);
// 8k缓存数据
byte[] buffer = new byte[1024 * 8];
// 设置读进缓存的字节数
int len;
while ((len = is.read(buffer)) != -1) {
// 将缓存数据写入磁盘
os.write(buffer, 0, len);
}
// 关闭输出流
os.close();
// 关闭输入流
is.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
/**
*
* @param fileNames
* @return
*/
public static String[] separateFileNames(String fileNames) {
return fileNames.split(Constants.FILE_SEPARATE);
}
/**
*
* @param fileNames
* @param separateFlag
* @return
*/
public static String[] separateFileNames(String fileNames,
String separateFlag) {
return fileNames.split(separateFlag);
}
/**
* 用操作系统的目录分离符
* @param str
* @return
*/
public static String repace(String str) {
String realPath = "";
for (int i = 0; i < str.length(); i++) {
char ch = str.charAt(i);
String tmp = "";
if (ch == '/') {
tmp = File.separator;
} else if (ch == '\\') {
tmp = File.separator;
} else {
tmp = tmp + ch;
}
realPath = realPath + tmp;
}
return realPath;
}
/**
* 把反斜杆替换成斜杆
* @param str
* @return
*/
public static String repaceBySlash(String str) {
String realPath = "";
for (int i = 0; i < str.length(); i++) {
char ch = str.charAt(i);
String tmp = "";
if (ch == '\\') {
tmp = "/";
} else {
tmp = tmp + ch;
}
realPath = realPath + tmp;
}
return realPath;
}
/**
* 把斜杆替换成反斜杆
* @param str
* @return
*/
public static String repaceByBackslash(String str) {
String realPath = "";
for (int i = 0; i < str.length(); i++) {
char ch = str.charAt(i);
String tmp = "";
if (ch == '/') {
tmp = "\\";
} else {
tmp = tmp + ch;
}
realPath = realPath + tmp;
}
return realPath;
}
public static void writeFile(String path, String str) {
try {
FileWriter writer = new FileWriter(path);
writer.write(str);
writer.close();
} catch (IOException e) {
e.printStackTrace();
if (logger.isInfoEnabled())
logger.info(e.getMessage());
}
}
public static String getHttpPath(HttpServletRequest request) {
String root = request.getContextPath();
String basePath = request.getScheme() + "://" + request.getServerName()
+ ":" + request.getServerPort() + root;
return basePath;
}
}
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