文件操作工具
zip文件压缩、下载
public class FileUtil {
/**
*生成zip压缩文件
**/
public static boolean createCardImgZip(String sourcePath, String zipName) {
// TODO Auto-generated method stub
boolean result = false;
String zipPath = sourcePath;
File sourceFile = new File(sourcePath);
FileInputStream fis = null;
BufferedInputStream bis = null;
FileOutputStream fos = null;
ZipOutputStream zos = null;
if (sourceFile.exists() == false) {
System.out.println("File catalog:" + sourcePath + "not exist!");
} else {
try {
if(!new File(zipPath).exists()){
new File(zipPath).mkdirs();
}
File zipFile = new File(zipPath + "/" + zipName + ".zip");
if (zipFile.exists()) {
System.out.println(zipPath + "Catalog File: " + zipName + ".zip" + "pack file.");
} else {
File[] sourceFiles = sourceFile.listFiles();
if (null == sourceFiles || sourceFiles.length < 1) {
System.out.println("File Catalog:" + sourcePath + "nothing in there,don't hava to compress!");
} else {
fos = new FileOutputStream(zipFile);
zos = new ZipOutputStream(new BufferedOutputStream(fos));
byte[] bufs = new byte[1024 * 10];
for (int i = 0; i < sourceFiles.length; i++) {
// create .zip and put pictures in
ZipEntry zipEntry = new ZipEntry(sourceFiles[i].getName());
zos.putNextEntry(zipEntry);
// read documents and put them in the zip
fis = new FileInputStream(sourceFiles[i]);
bis = new BufferedInputStream(fis, 1024 * 10);
int read = 0;
while ((read = bis.read(bufs, 0, 1024 * 10)) != -1) {
zos.write(bufs, 0, read);
}
}
result = true;
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
throw new RuntimeException(e);
} catch (IOException e) {
e.printStackTrace();
throw new RuntimeException(e);
} finally {
try {
if(null != bis) {
bis.close();
}
if(null != zos) {
zos.close();
}
} catch (IOException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
}
return result;
}
public static void doCompress(String srcFile, String zipFile) throws IOException {
doCompress(new File(srcFile), new File(zipFile));
}
/**
* 文件压缩
* @param srcFile 目录或者单个文件
* @param zipFile 压缩后的ZIP文件
*/
public static void doCompress(File srcFile, File zipFile) throws IOException {
ZipOutputStream out = null;
try {
out = new ZipOutputStream(new FileOutputStream(zipFile));
doCompress(srcFile, out);
} catch (Exception e) {
throw e;
} finally {
out.close();//记得关闭资源
}
}
public static void doCompress(String filelName, ZipOutputStream out) throws IOException{
doCompress(new File(filelName), out);
}
public static void doCompress(File file, ZipOutputStream out) throws IOException{
doCompress(file, out, "");
}
public static void doCompress(File inFile, ZipOutputStream out, String dir) throws IOException {
if ( inFile.isDirectory() ) {
File[] files = inFile.listFiles();
if (files!=null && files.length>0) {
for (File file : files) {
String name = inFile.getName();
if (!"".equals(dir)) {
name = dir + "/" + name;
}
FileUtil.doCompress(file, out, name);
}
}
} else {
FileUtil.doZip(inFile, out, dir);
}
}
public static void doZip(File inFile, ZipOutputStream out, String dir) throws IOException {
String entryName = null;
if (!"".equals(dir)) {
entryName = dir + "/" + inFile.getName();
} else {
entryName = inFile.getName();
}
ZipEntry entry = new ZipEntry(entryName);
out.putNextEntry(entry);
int len = 0 ;
byte[] buffer = new byte[1024];
FileInputStream fis = new FileInputStream(inFile);
while ((len = fis.read(buffer)) > 0) {
out.write(buffer, 0, len);
out.flush();
}
out.closeEntry();
fis.close();
}
}
zip解压到指定目录
ZipFile zipFile;//创建ZipInputStream对象
zipFile = new ZipFile(mf.getAbsoluteFile());
Enumeration<? extends ZipEntry > entries = zipFile.entries(); // 获取下一个ZipEntry,获取zipfile里面的每一个zipentry实例
while (entries.hasMoreElements()){
ZipEntry entry=entries.nextElement();
File entryDestination = new File("D:\\", entry.getName());
if (entry.isDirectory()) {
entryDestination.mkdirs();
} else {
entryDestination.getParentFile().mkdirs();
InputStream in = zipFile.getInputStream(entry);
OutputStream out = new FileOutputStream(entryDestination);
IOUtils.copy(in, out);
IOUtils.closeQuietly(in);
out.close();
}
}
文件编码转换
/**
* 把指定文件或目录转换成指定的编码
*
* @param fileName
* 要转换的文件
* @param fromCharsetName
* 源文件的编码
* @param toCharsetName
* 要转换的编码
* @throws Exception
*/
public static void convert(String fileName, String fromCharsetName,
String toCharsetName) throws Exception {
convert(new File(fileName), fromCharsetName, toCharsetName, null);
}
/**
* 把指定文件或目录转换成指定的编码
*
* @param file
* 要转换的文件或目录
* @param fromCharsetName
* 源文件的编码
* @param toCharsetName
* 要转换的编码
* @throws Exception
*/
public static void convert(File file, String fromCharsetName,
String toCharsetName) throws Exception {
convert(file, fromCharsetName, toCharsetName, null);
}
/**
* 把指定文件或目录转换成指定的编码
*
* @param file
* 要转换的文件或目录
* @param fromCharsetName
* 源文件的编码
* @param toCharsetName
* 要转换的编码
* @param filter
* 文件名过滤器
* @throws Exception
*/
public static void convert(String fileName, String fromCharsetName,
String toCharsetName, FilenameFilter filter) throws Exception {
convert(new File(fileName), fromCharsetName, toCharsetName, filter);
}
/**
* 把指定文件或目录转换成指定的编码
*
* @param file
* 要转换的文件或目录
* @param fromCharsetName
* 源文件的编码
* @param toCharsetName
* 要转换的编码
* @param filter
* 文件名过滤器
* @throws Exception
*/
public static void convert(File file, String fromCharsetName,
String toCharsetName, FilenameFilter filter) throws Exception {
if (file.isDirectory()) {
File[] fileList = null;
if (filter == null) {
fileList = file.listFiles();
} else {
fileList = file.listFiles(filter);
}
for (File f : fileList) {
convert(f, fromCharsetName, toCharsetName, filter);
}
} else {
if (filter == null
|| filter.accept(file.getParentFile(), file.getName())) {
String fileContent = getFileContentFromCharset(file,
fromCharsetName);
saveFile2Charset(file, toCharsetName, fileContent);
}
}
}
/**
* 以指定编码方式读取文件，返回文件内容
*
* @param file
* 要转换的文件
* @param fromCharsetName
* 源文件的编码
* @return
* @throws Exception
*/
public static String getFileContentFromCharset(File file,
String fromCharsetName) throws Exception {
if (!Charset.isSupported(fromCharsetName)) {
throw new UnsupportedCharsetException(fromCharsetName);
}
InputStream inputStream = new FileInputStream(file);
InputStreamReader reader = new InputStreamReader(inputStream,
fromCharsetName);
char[] chs = new char[(int) file.length()];
reader.read(chs);
String str = new String(chs).trim();
reader.close();
return str;
}
/**
* 以指定编码方式写文本文件，存在会覆盖
*
* @param file
* 要写入的文件
* @param toCharsetName
* 要转换的编码
* @param content
* 文件内容
* @throws Exception
*/
public static void saveFile2Charset(File file, String toCharsetName,
String content) throws Exception {
if (!Charset.isSupported(toCharsetName)) {
throw new UnsupportedCharsetException(toCharsetName);
}
OutputStream outputStream = new FileOutputStream(file);
OutputStreamWriter outWrite = new OutputStreamWriter(outputStream,
toCharsetName);
outWrite.write(content);
outWrite.close();
}
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