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package util;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Serializable;
import java.io.StringWriter;
import java.io.Writer;
/**
* Created by sunhao on 17/5/9.
* IO工具类
*/
public class IOUtil
{
public static void close(OutputStream os) {
if (os != null) {
try {
os.close();
} catch (Exception ignored) {
}
}
}
public static void close(InputStream is) {
if (is != null) {
try {
is.close();
} catch (Exception ignored) {
}
}
}
public static void close(Writer os) {
if (os != null) {
try {
os.close();
} catch (Exception ignored) {
}
}
}
public static void close(Reader is) {
if (is != null) {
try {
is.close();
} catch (Exception ignored) {
}
}
}
public static void deleteAllFiles(File directory) {
File[] files = directory.listFiles();
for (File file : files) {
if (!file.delete()) {
// System.out.println("Cannot delete " + file);
}
}
}
public static String readString(InputStream input, String encoding)
throws IOException {
InputStreamReader ir = (encoding == null ? new InputStreamReader(input) : new InputStreamReader(input, encoding));
StringWriter sw = new StringWriter();
try {
copy(ir, sw);
return sw.toString();
} finally {
close(sw);
}
}
public static long copy(InputStream in, OutputStream out)
throws IOException {
byte[] buffer = new byte[1024 * 4];
int len;
long count = 0;
while ((len = in.read(buffer)) >= 0) {
out.write(buffer, 0, len);
count += len;
}
return count;
}
public static long copy(Reader in, Writer out)
throws IOException {
char[] buffer = new char[1024 * 4];
int len;
long count = 0;
while ((len = in.read(buffer)) >= 0) {
out.write(buffer, 0, len);
count += len;
}
return count;
}
public static long copy(File src, File dest)
throws IOException {
FileInputStream fis = new FileInputStream(src);
FileOutputStream fos = new FileOutputStream(dest);
try {
return copy(fis, fos);
} finally {
close(fis);
close(fos);
}
}
public static byte[] objToBytes(Serializable obj)
throws IOException {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutputStream oo = new ObjectOutputStream(bos);
try {
oo.writeObject(obj);
return bos.toByteArray();
} finally {
close(oo);
close(bos);
}
}
public static Object objFromBytes(byte[] bytes)
throws IOException, ClassNotFoundException {
ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
ObjectInputStream oi = new ObjectInputStream(bis);
try {
return oi.readObject();
} finally {
close(oi);
close(bis);
}
}
public static void objToStream(OutputStream os, Serializable obj)
throws IOException {
ObjectOutputStream oo = new ObjectOutputStream(os);
try {
oo.writeObject(obj);
} finally {
close(oo);
}
}
public static Object objFromStream(InputStream is)
throws IOException, ClassNotFoundException {
ObjectInputStream oi = new ObjectInputStream(is);
try {
return oi.readObject();
} finally {
close(oi);
}
}
public static void saveObject(File file, Serializable obj)
throws IOException {
objToStream(new BufferedOutputStream(new FileOutputStream(file)), obj);
}
public static Object loadObject(File file)
throws IOException, ClassNotFoundException {
return objFromStream(new BufferedInputStream(new FileInputStream(file)));
}
}