java File的基本操作实例

package com.file.sample;

import java.io.*;

public class FileOperate {
public FileOperate() {
}

/**
* 新建目录
*
* @param folderPath
*            String 如 c:/fqf
* @return boolean
*/
public void newFolder(String folderPath) {
try {
String filePath = folderPath;
filePath = filePath.toString();
java.io.File myFilePath = new java.io.File(filePath);
if (!myFilePath.exists()) {
myFilePath.mkdir();
}
} catch (Exception e) {
System.out.println("新建目录操作出错");
e.printStackTrace();
}
}

/**
* 新建文件
*
* @param filePathAndName
*            String 文件路径及名称 如c:/fqf.txt
* @param fileContent
*            String 文件内容
* @return boolean
*/
public void newFile(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);
resultFile.close();
                            myFile.close();

                         
} catch (Exception e) {
System.out.println("新建目录操作出错");
e.printStackTrace();

}

}

/**
* 删除文件
*
* @param filePathAndName
*            String 文件路径及名称 如c:/fqf.txt
* @param fileContent
*            String
* @return boolean
*/
public void delFile(String filePathAndName) {
try {
String filePath = filePathAndName;
filePath = filePath.toString();
java.io.File myDelFile = new java.io.File(filePath);
myDelFile.delete();

} catch (Exception e) {
System.out.println("删除文件操作出错");
e.printStackTrace();

}

}

/**
* 删除文件夹
*
* @param filePathAndName
*            String 文件夹路径及名称 如c:/fqf
* @param fileContent
*            String
* @return boolean
*/
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) {
System.out.println("删除文件夹操作出错");
e.printStackTrace();

}

}

/**
* 删除文件夹里面的所有文件
*
* @param path
*            String 文件夹路径 如 c:/fqf
*/
public void delAllFile(String path) {
File file = new File(path);
if (!file.exists()) {
return;
}
if (!file.isDirectory()) {
return;
}
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
}
}
}

/**
* 复制单个文件
*
* @param oldPath
*            String 原文件路径 如：c:/fqf.txt
* @param newPath
*            String 复制后路径 如：f:/fqf.txt
* @return boolean
*/
public void copyFile(String oldPath, String newPath) {
try {
int bytesum = 0;
int byteread = 0;
File oldfile = new File(oldPath);
if (oldfile.exists()) { // 文件存在时
InputStream inStream = new FileInputStream(oldPath); // 读入原文件
FileOutputStream fs = new FileOutputStream(newPath);
byte[] buffer = new byte[1444];
int length;
while ((byteread = inStream.read(buffer)) != -1) {
bytesum += byteread; // 字节数 文件大小
System.out.println(bytesum);
fs.write(buffer, 0, byteread);
}
inStream.close();
}
} catch (Exception e) {
System.out.println("复制单个文件操作出错");
e.printStackTrace();

}

}

/**
* 复制整个文件夹内容
*
* @param oldPath
*            String 原文件路径 如：c:/fqf
* @param newPath
*            String 复制后路径 如：f:/fqf/ff
* @return boolean
*/
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) {
System.out.println("复制整个文件夹内容操作出错");
e.printStackTrace();

}

}

/**
* 移动文件到指定目录
*
* @param oldPath
*            String 如：c:/fqf.txt
* @param newPath
*            String 如：d:/fqf.txt
*/
public void moveFile(String oldPath, String newPath) {
copyFile(oldPath, newPath);
delFile(oldPath);

}

/**
* 移动文件到指定目录
*
* @param oldPath
*            String 如：c:/fqf.txt
* @param newPath
*            String 如：d:/fqf.txt
*/
public void moveFolder(String oldPath, String newPath) {
copyFolder(oldPath, newPath);
delFolder(oldPath);

}

public static void  main(String[] args){
FileOperate filedemo=new FileOperate();
filedemo.delAllFile("d:/test");
}
}

评论

1 楼 nggno1 2009-09-10  

/**
* 新建文件
*
* @param filePathAndName
*            String 文件路径及名称 如c:/fqf.txt
* @param fileContent
*            String 文件内容
* @return boolean
*/
public void newFile(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);
resultFile.close();

} catch (Exception e) {
System.out.println("新建目录操作出错");
e.printStackTrace();

}

}

myFile 未close。。这样不好吧