最全面最稳定的Java读写操作工具箱

好吧！每次读写文件数据，都要回忆下关于while

的大段代码，还有各种异常处理！也许是这样：

byte[] buffer = new byte[1024];int c;while ((c = in.read(buffer, 0, 1024)) != -1) {os.write(buffer, 0, c);}os.flush();

终于受够了，请看下面工具箱。

文件、流、字符串、字节、对象等各种类型数据的快捷读写一应俱全。

import java.io.ByteArrayOutputStream;import java.io.Closeable;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.ObjectInputStream;import java.io.ObjectOutputStream;import java.io.OutputStream;public class IOUtils {private IOUtils() {}private static void closeSilently(Closeable closeable) {try {if (closeable != null) {closeable.close();}} catch (Exception e) {}}private static void throwExceptionIfNull(Object object) {if (object == null) {throw new NullPointerException();}}private static void ensureFileExists(File file) throws IOException {throwExceptionIfNull(file);if (file.isDirectory()) {throw new IOException(file.getAbsolutePath() + " isn't a file.");}if (!file.exists()) {File parent = file.getParentFile();if (parent != null && parent.isDirectory() && !parent.exists()) {if (!parent.mkdirs()) {throw new IOException("Create directory "+ parent.getAbsolutePath() + " failed.");}}if (!file.createNewFile()) {throw new IOException("Create file " + file.getAbsolutePath()+ " failed.");}}}public static void writeByte(OutputStream os, int b) throws IOException {os.write(b);os.flush();}public static void writeByte(OutputStream os, byte[] data, int off, int len)throws IOException {os.write(data, off, len);os.flush();}public static void writeByte(OutputStream os, byte[] data)throws IOException {os.write(data);os.flush();}public static void writeByte(File file, byte[] data) throws IOException {ensureFileExists(file);FileOutputStream os = new FileOutputStream(file);writeByte(os, data);closeSilently(os);}public static void writeByte(File parent, String filename, byte[] data)throws IOException {writeByte(new File(parent, filename), data);}public static void writeByte(String parent, String filename, byte[] data)throws IOException {writeByte(new File(parent, filename), data);}public static void writeByte(String pathname, byte[] data)throws IOException {writeByte(new File(pathname), data);}public static void writeString(OutputStream os, String text,String charsetName) throws IOException {writeByte(os, text.getBytes(charsetName));}public static void writeString(File file, String text, String charsetName)throws IOException {writeByte(file, text.getBytes(charsetName));}public static void writeString(String pathname, String text,String charsetName) throws IOException {writeByte(pathname, text.getBytes(charsetName));}public static void writeString(File parent, String filename, String text,String charsetName) throws IOException {writeByte(parent, filename, text.getBytes(charsetName));}public static void writeString(String parent, String filename, String text,String charsetName) throws IOException {writeByte(parent, filename, text.getBytes(charsetName));}public static void writeStream(OutputStream os, InputStream in)throws IOException {throwExceptionIfNull(os);throwExceptionIfNull(in);byte[] buffer = new byte[1024];int c;while ((c = in.read(buffer, 0, 1024)) != -1) {os.write(buffer, 0, c);}os.flush();}public static void writeStream(File target, InputStream in,boolean append)throws IOException {ensureFileExists(target);FileOutputStream os = new FileOutputStream(target,append);writeStream(os, in);closeSilently(os);}public static void writeStream(String pathname, InputStream in,boolean append)throws IOException {writeStream(new File(pathname), in,append);}public static void writeStream(String parent, String filename,InputStream in,boolean append) throws IOException {writeStream(new File(parent, filename), in,append);}public static void writeStream(File parent, String filename, InputStream in,boolean append)throws IOException {writeStream(new File(parent, filename), in,append);}public static void writeObject(OutputStream os, Object object)throws IOException {throwExceptionIfNull(os);ObjectOutputStream oos = new ObjectOutputStream(os);oos.writeObject(object);oos.flush();}public static void writeObject(File file, Object object) throws IOException {ensureFileExists(file);FileOutputStream os = new FileOutputStream(file);writeObject(os, object);closeSilently(os);}public static void writeObject(String pathname, Object object)throws IOException {writeObject(new File(pathname), object);}public static void writeObject(String parent, String filename, Object object)throws IOException {writeObject(new File(parent, filename), object);}public static void writeObject(File parent, String filename, Object object)throws IOException {writeObject(new File(parent, filename), object);}public static byte[] readByte(InputStream in) throws IOException {throwExceptionIfNull(in);ByteArrayOutputStream writer = new ByteArrayOutputStream();byte[] buffer = new byte[1024];int c;while ((c = in.read(buffer, 0, 1024)) != -1) {writer.write(buffer, 0, c);}writer.flush();return writer.toByteArray();}public static byte[] readByte(File file) throws IOException {FileInputStream in = new FileInputStream(file);byte[] result = readByte(in);closeSilently(in);return result;}public static byte[] readByte(String parent, String filename)throws IOException {return readByte(new File(parent, filename));}public static byte[] readByte(File parent, String filename)throws IOException {return readByte(new File(parent, filename));}public static byte[] readByte(String pathname) throws IOException {return readByte(new File(pathname));}public static String readString(InputStream in, String charsetName)throws IOException {return new String(readByte(in), charsetName);}public static String readString(File file, String charsetName)throws IOException {return new String(readByte(file), charsetName);}public static String readString(String parent, String filename,String charsetName) throws IOException {return new String(readByte(parent, filename), charsetName);}public static String readString(File parent, String filename,String charsetName) throws IOException {return new String(readByte(parent, filename), charsetName);}public static String readString(String pathname, String charsetName)throws IOException {return new String(readByte(pathname), charsetName);}public static Object readObject(InputStream in) throws IOException,ClassNotFoundException {throwExceptionIfNull(in);ObjectInputStream oin = new ObjectInputStream(in);return oin.readObject();}public static Object readObject(File file) throws IOException,ClassNotFoundException {FileInputStream in = new FileInputStream(file);Object result=readObject(in);closeSilently(in);return result;}public static Object readObject(String parent, String filename)throws IOException, ClassNotFoundException {return readObject(new File(parent, filename));}public static Object readObject(File parent, String filename) throws IOException,ClassNotFoundException {return readObject(new File(parent, filename));}public static Object readObject(String pathname) throws IOException,ClassNotFoundException {return readObject(new File(pathname));}}

国际惯例

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作者：薄荷记账  （转载请注明原作者）

简洁   稳定   优雅   无限可能！