解决的问题：一个超级庞大的文件加，里面有一些我们需要的文件， 把他们找出来。 具体自己看吧，用的上就拿去。
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.nio.channels.FileChannel;
import org.apache.commons.io.FileUtils;
/**
* @author Stony Zhang (zhangyu0182@sina.com)
* http://mybeautiful.iteye.com
*/
public class BatchFileRename {
private File targetFolder;
private String soureFolder;
private String extName; // such as ".png"
private FileNameHander nameHandler;
private FileWriter contentFileWriter;
public BatchFileRename(String soureFolder, String targetFolder, String extName) {
this(soureFolder,targetFolder,extName, true);
}
public BatchFileRename(String soureFolder, String targetFolder, String extName, boolean cleanTarget) {
this.soureFolder = soureFolder;
this.extName = extName;
this.targetFolder = new File(targetFolder);
if(!this.targetFolder.exists()){
this.targetFolder.mkdirs();
}
if (cleanTarget){
try {
FileUtils.cleanDirectory(this.targetFolder);
} catch (IOException e) {
e.printStackTrace();
}
}
try {
contentFileWriter = new FileWriter(new File(targetFolder, "content.txt"), true);
} catch (IOException e) {
e.printStackTrace();
}
}
public void execute() {
File sourceDir = new File(this.soureFolder);
if (!sourceDir.isDirectory()) {
System.out.println("Pls specified an correct forder!");
return;
}
scanFolder(sourceDir);
try {
contentFileWriter.close();
} catch (IOException e) {
e.printStackTrace();
}
}
private void scanFolder(File sourceDir) {
File[] list = sourceDir.listFiles();
for (File file : list) {
if (file.isDirectory()) {
scanFolder(file);
continue;
}
if (!file.getName().endsWith(extName)) {
continue;
}
this.copyToTargetFolder(file);
}
}
private void copyToTargetFolder(File file) {
try {
// check if the file exists?
String fileName = this.getFileName(file);
System.out.println("Copy file :" + file.getAbsolutePath());
contentFileWriter.write(String.format("%-40s %s\r\n", fileName, file.getAbsolutePath()));
contentFileWriter.write(String.format("%80s\r\n", "_").replace(" ", "_"));
copyFile(file, new File(this.targetFolder, fileName));
} catch (IOException e) {
e.printStackTrace();
}
}
private String getFileName(File file) {
String fName = getNameHandler().newName(file);
File destFile = new File(this.targetFolder, fName);
if (!destFile.exists()) {
return fName;
}
String newFileName;
int index = fName.lastIndexOf(".");
if (index > 0) {
String mainName = fName.substring(0, index);
String extName = fName.substring(index);
newFileName = mainName + "_1" + extName;
} else {
newFileName = fName + "_1";
}
File newFile = new File(this.targetFolder, newFileName);
if (newFile.exists()) {
return getFileName(newFile);
}
return newFileName;
}
public static void copyFile(File in, File out) throws IOException {
FileInputStream fileInputStream = new FileInputStream(in);
FileOutputStream fileOutputStream = new FileOutputStream(out);
try {
FileChannel sourceChannel = fileInputStream.getChannel();
FileChannel destinationChannel = fileOutputStream.getChannel();
sourceChannel.transferTo(0, sourceChannel.size(), destinationChannel);
// or destinationChannel.transferFrom(sourceChannel, 0,
// sourceChannel.size());
fileInputStream.close();
fileOutputStream.close();
sourceChannel.close();
destinationChannel.close();
} catch (Exception e) {
e.printStackTrace();
} finally {
}
}
public static void main(String[] args) {
BatchFileRename run = new BatchFileRename("f:\\temp\\test_src", "F:\\temp\\test_dest", ".png");
run.setNameHandler(new FileNameHander() {
@Override
public String newName(File file) {
return file.getName().toLowerCase();
}
});
run.execute();
}
public FileNameHander getNameHandler() {
return nameHandler;
}
public void setNameHandler(FileNameHander nameHandler) {
this.nameHandler = nameHandler;
}
private static interface FileNameHander {
String newName(File file);
}
}
注意： 依赖common-io.
转播
