java对文件（file）操作的各种方法

import java.io.*;
import java.util.*;

public class FileOperate {
private String message;

public FileOperate() {
}

/**
* 获取文件夹大小
*
* @param file 文件路径
*
* @return 返回文件夹大小
*/
public long getFileSize(File f) throws Exception {
long size = 0;
File flist[] = f.listFiles();
for (int i = 0; i < flist.length; i++) {
if (flist[i].isDirectory()) {
size = size + getFileSize(flist[i]);
} else {
size = size + flist[i].length();
}
}
return size;
}

/**
* 读取文本文件内容
*
* @param filePathAndName
* 带有完整绝对路径的文件名
* @param encoding
* 文本文件打开的编码方式
* @return 返回文本文件的内容
*/
public String readTxt(String filePathAndName, String encoding)
throws IOException {
encoding = encoding.trim();
StringBuffer str = new StringBuffer("");
String st = "";
try {
FileInputStream fs = new FileInputStream(filePathAndName);
InputStreamReader isr;
if (encoding.equals("")) {
isr = new InputStreamReader(fs);
} else {
isr = new InputStreamReader(fs, encoding);
}
BufferedReader br = new BufferedReader(isr);
try {
String data = "";
while ((data = br.readLine()) != null) {
str.append(data + " ");
}
} catch (Exception e) {
str.append(e.toString());
}
st = str.toString();
} catch (IOException es) {
st = "";
}
return st;
}

/**
* 遍历指定路径下指定后缀的所有文件
*
* @param folderPath
* 文件路径
* @param tag
* 后缀
* @return
*/
public Vector<String> checkFolder(String folderPath, String tag) {
// TODO Auto-generated method stub
Vector<String> output = new Vector<String>();
LinkedList<File> list = new LinkedList<File>();
File dir = new File(folderPath);
File file[] = dir.listFiles();
for (int i = 0; i < file.length; i++) {
if (file[i].isDirectory())
list.add(file[i]);
else {
StringBuffer strTemp = new StringBuffer(file[i]
.getAbsolutePath());
if (strTemp.substring(strTemp.length() - tag.length())
.toString().equals(tag))
output.add(file[i].getAbsolutePath());
}
}
File tmp;
while (!list.isEmpty()) {
tmp = list.removeFirst();
if (tmp.isDirectory()) {
file = tmp.listFiles();
if (file == null)
continue;
for (int i = 0; i < file.length; i++) {
if (file[i].isDirectory())
list.add(file[i]);
else {
StringBuffer strTemp = new StringBuffer(file[i]
.getAbsolutePath());
if (strTemp.substring(strTemp.length() - tag.length())
.toString().equals(tag))
output.add(file[i].getAbsolutePath());
}
}
} else {
StringBuffer strTemp = new StringBuffer(tmp.getAbsolutePath());
if (strTemp.substring(strTemp.length() - tag.length())
.toString().equals(tag))
output.add(tmp.getAbsolutePath());
}
}
return output;
}

/**
* 新建目录
*
* @param folderPath
* 目录
* @return 返回目录创建后的路径
*/
public String createFolder(String folderPath) {
String txt = folderPath;
try {
java.io.File myFilePath = new java.io.File(txt);
txt = folderPath;
if (!myFilePath.exists()) {
myFilePath.mkdir();
}
} catch (Exception e) {
message = "创建目录操作出错";
}
return txt;
}

/**
* 多级目录创建
*
* @param folderPath
* 准备要在本级目录下创建新目录的目录路径 例如 c:myf
* @param paths
* 无限级目录参数，各级目录以单数线区分 例如 a|b|c
* @return 返回创建文件后的路径 例如 c:myfa c
*/
public String createFolders(String folderPath, String paths) {
String txts = folderPath;
try {
String txt;
txts = folderPath;
StringTokenizer st = new StringTokenizer(paths, "|");
for (int i = 0; st.hasMoreTokens(); i++) {
txt = st.nextToken().trim();
if (txts.lastIndexOf("/") != -1) {
txts = createFolder(txts + txt);
} else {
txts = createFolder(txts + txt + "/");
}
}
} catch (Exception e) {
message = "创建目录操作出错！";
}
return txts;
}

/**
* 新建文件
*
* @param filePathAndName
* 文本文件完整绝对路径及文件名
* @param fileContent
* 文本文件内容
* @return
*/
public void createFile(String filePathAndName, String fileContent) {

try {
String filePath = filePathAndName;
filePath = filePath.toString();
File myFilePath = new File(filePath);
if (!myFilePath.exists()) {
myFilePath.createNewFile();
}
FileWriter resultFile = new FileWriter(myFilePath);
PrintWriter myFile = new PrintWriter(resultFile);
String strContent = fileContent;
myFile.println(strContent);
myFile.close();
resultFile.close();
} catch (Exception e) {
message = "创建文件操作出错";
}
}

/**
* 有编码方式的文件创建
*
* @param filePathAndName
* 文本文件完整绝对路径及文件名
* @param fileContent
* 文本文件内容
* @param encoding
* 编码方式 例如 GBK 或者 UTF-8
* @return
*/
public void createFile(String filePathAndName, String fileContent,
String encoding) {

try {
String filePath = filePathAndName;
filePath = filePath.toString();
File myFilePath = new File(filePath);
if (!myFilePath.exists()) {
myFilePath.createNewFile();
}
PrintWriter myFile = new PrintWriter(myFilePath, encoding);
String strContent = fileContent;
myFile.println(strContent);
myFile.close();
} catch (Exception e) {
message = "创建文件操作出错";
}
}

/**
* 删除文件
*
* @param filePathAndName
* 文本文件完整绝对路径及文件名
* @return Boolean 成功删除返回true遭遇异常返回false
*/
public boolean delFile(String filePathAndName) {
boolean bea = false;
try {
String filePath = filePathAndName;
File myDelFile = new File(filePath);
if (myDelFile.exists()) {
myDelFile.delete();
bea = true;
} else {
bea = false;
message = (filePathAndName + "删除文件操作出错");
}
} catch (Exception e) {
message = e.toString();
}
return bea;
}

/**
* 删除文件夹
*
* @param folderPath
* 文件夹完整绝对路径
* @return
*/
public void delFolder(String folderPath) {
try {
delAllFile(folderPath); // 删除完里面所有内容
String filePath = folderPath;
filePath = filePath.toString();
java.io.File myFilePath = new java.io.File(filePath);
myFilePath.delete(); // 删除空文件夹
} catch (Exception e) {
message = ("删除文件夹操作出错");
}
}

/**
* 删除指定文件夹下所有文件
*
* @param path
* 文件夹完整绝对路径
* @return
* @return
*/
public boolean delAllFile(String path) {
boolean bea = false;
File file = new File(path);
if (!file.exists()) {
return bea;
}
if (!file.isDirectory()) {
return bea;
}
String[] tempList = file.list();
File temp = null;
for (int i = 0; i < tempList.length; i++) {
if (path.endsWith(File.separator)) {
temp = new File(path + tempList[i]);
} else {
temp = new File(path + File.separator + tempList[i]);
}
if (temp.isFile()) {
temp.delete();
}
if (temp.isDirectory()) {
delAllFile(path + "/" + tempList[i]);// 先删除文件夹里面的文件
delFolder(path + "/" + tempList[i]);// 再删除空文件夹
bea = true;
}
}
return bea;
}

/**
* 复制单个文件
*
* @param oldPathFile
* 准备复制的文件源
* @param newPathFile
* 拷贝到新绝对路径带文件名
* @return
*/
public void copyFile(String oldPathFile, String newPathFile) {
try {
int bytesum = 0;
int byteread = 0;
File oldfile = new File(oldPathFile);
if (oldfile.exists()) { // 文件存在时
InputStream inStream = new FileInputStream(oldPathFile); // 读入原文件
FileOutputStream fs = new FileOutputStream(newPathFile);
byte[] buffer = new byte[1444];
while ((byteread = inStream.read(buffer)) != -1) {
bytesum += byteread; // 字节数 文件大小
fs.write(buffer, 0, byteread);
}
inStream.close();
}
} catch (Exception e) {
message = ("复制单个文件操作出错");
}
}

/**
* 复制整个文件夹的内容
*
* @param oldPath
* 准备拷贝的目录
* @param newPath
* 指定绝对路径的新目录
* @return
*/
public void copyFolder(String oldPath, String newPath) {
try {
new File(newPath).mkdirs(); // 如果文件夹不存在 则建立新文件夹
File a = new File(oldPath);
String[] file = a.list();
File temp = null;
for (int i = 0; i < file.length; i++) {
if (oldPath.endsWith(File.separator)) {
temp = new File(oldPath + file[i]);
} else {
temp = new File(oldPath + File.separator + file[i]);
}
if (temp.isFile()) {
FileInputStream input = new FileInputStream(temp);
FileOutputStream output = new FileOutputStream(newPath
+ "/" + (temp.getName()).toString());
byte[] b = new byte[1024 * 5];
int len;
while ((len = input.read(b)) != -1) {
output.write(b, 0, len);
}
output.flush();
output.close();
input.close();
}
if (temp.isDirectory()) {// 如果是子文件夹
copyFolder(oldPath + "/" + file[i], newPath + "/" + file[i]);
}
}
} catch (Exception e) {
message = "复制整个文件夹内容操作出错";
}
}

/**
* 移动文件
*
* @param oldPath
* @param newPath
* @return
*/
public void moveFile(String oldPath, String newPath) {
copyFile(oldPath, newPath);
delFile(oldPath);
}

/**
* 移动目录
*
* @param oldPath
* @param newPath
* @return
*/
public void moveFolder(String oldPath, String newPath) {
copyFolder(oldPath, newPath);
delFolder(oldPath);
}

public String getMessage() {
return this.message;
}