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Hutool是一个小而全的Java工具类库，通过静态方法封装，降低相关API的学习成本，提高工作效率，使Java拥有函数式语言般的优雅，让Java语言也可以“甜甜的”。
package cn.hutool.core.io;
import cn.hutool.core.collection.LineIter;
import cn.hutool.core.convert.Convert;
import cn.hutool.core.exceptions.UtilException;
import cn.hutool.core.io.copy.ReaderWriterCopier;
import cn.hutool.core.io.copy.StreamCopier;
import cn.hutool.core.lang.Assert;
import cn.hutool.core.util.CharsetUtil;
import cn.hutool.core.util.HexUtil;
import cn.hutool.core.util.StrUtil;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.Flushable;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.PushbackInputStream;
import java.io.PushbackReader;
import java.io.Reader;
import java.io.Serializable;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import java.nio.CharBuffer;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;
import java.util.Collection;
import java.util.Objects;
import java.util.zip.CRC32;
import java.util.zip.CheckedInputStream;
import java.util.zip.Checksum;
/**
* IO工具类
* IO工具类只是辅助流的读写，并不负责关闭流。原因是流可能被多次读写，读写关闭后容易造成问题。
*
* @author xiaoleilu
*/
public class IoUtil extends NioUtil {
// -------------------------------------------------------------------------------------- Copy start
/**
* 将Reader中的内容复制到Writer中 使用默认缓存大小，拷贝后不关闭Reader
*
* @param reader Reader
* @param writer Writer
* @return 拷贝的字节数
* @throws IORuntimeException IO异常
*/
public static long copy(Reader reader, Writer writer) throws IORuntimeException {
return copy(reader, writer, DEFAULT_BUFFER_SIZE);
}
/**
* 将Reader中的内容复制到Writer中，拷贝后不关闭Reader
*
* @param reader Reader
* @param writer Writer
* @param bufferSize 缓存大小
* @return 传输的byte数
* @throws IORuntimeException IO异常
*/
public static long copy(Reader reader, Writer writer, int bufferSize) throws IORuntimeException {
return copy(reader, writer, bufferSize, null);
}
/**
* 将Reader中的内容复制到Writer中，拷贝后不关闭Reader
*
* @param reader Reader
* @param writer Writer
* @param bufferSize 缓存大小
* @param streamProgress 进度处理器
* @return 传输的byte数
* @throws IORuntimeException IO异常
*/
public static long copy(Reader reader, Writer writer, int bufferSize, StreamProgress streamProgress) throws IORuntimeException {
return copy(reader, writer, bufferSize, -1, streamProgress);
}
/**
* 将Reader中的内容复制到Writer中，拷贝后不关闭Reader
*
* @param reader Reader
* @param writer Writer
* @param bufferSize 缓存大小
* @param count 最大长度
* @param streamProgress 进度处理器
* @return 传输的byte数
* @throws IORuntimeException IO异常
*/
public static long copy(Reader reader, Writer writer, int bufferSize, long count, StreamProgress streamProgress) throws IORuntimeException {
return new ReaderWriterCopier(bufferSize, count, streamProgress).copy(reader, writer);
}
/**
* 拷贝流，使用默认Buffer大小，拷贝后不关闭流
*
* @param in 输入流
* @param out 输出流
* @return 传输的byte数
* @throws IORuntimeException IO异常
*/
public static long copy(InputStream in, OutputStream out) throws IORuntimeException {
return copy(in, out, DEFAULT_BUFFER_SIZE);
}
/**
* 拷贝流，拷贝后不关闭流
*
* @param in 输入流
* @param out 输出流
* @param bufferSize 缓存大小
* @return 传输的byte数
* @throws IORuntimeException IO异常
*/
public static long copy(InputStream in, OutputStream out, int bufferSize) throws IORuntimeException {
return copy(in, out, bufferSize, null);
}
/**
* 拷贝流，拷贝后不关闭流
*
* @param in 输入流
* @param out 输出流
* @param bufferSize 缓存大小
* @param streamProgress 进度条
* @return 传输的byte数
* @throws IORuntimeException IO异常
*/
public static long copy(InputStream in, OutputStream out, int bufferSize, StreamProgress streamProgress) throws IORuntimeException {
return copy(in, out, bufferSize, -1, streamProgress);
}
/**
* 拷贝流，拷贝后不关闭流
*
* @param in 输入流
* @param out 输出流
* @param bufferSize 缓存大小
* @param count 总拷贝长度
* @param streamProgress 进度条
* @return 传输的byte数
* @throws IORuntimeException IO异常
* @since 5.7.8
*/
public static long copy(InputStream in, OutputStream out, int bufferSize, long count, StreamProgress streamProgress) throws IORuntimeException {
return new StreamCopier(bufferSize, count, streamProgress).copy(in, out);
}
/**
* 拷贝文件流，使用NIO
*
* @param in 输入
* @param out 输出
* @return 拷贝的字节数
* @throws IORuntimeException IO异常
*/
public static long copy(FileInputStream in, FileOutputStream out) throws IORuntimeException {
Assert.notNull(in, "FileInputStream is null!");
Assert.notNull(out, "FileOutputStream is null!");
FileChannel inChannel = null;
FileChannel outChannel = null;
try {
inChannel = in.getChannel();
outChannel = out.getChannel();
return copy(inChannel, outChannel);
} finally {
close(outChannel);
close(inChannel);
}
}
// -------------------------------------------------------------------------------------- Copy end
// -------------------------------------------------------------------------------------- getReader and getWriter start
/**
* 获得一个文件读取器，默认使用UTF-8编码
*
* @param in 输入流
* @return BufferedReader对象
* @since 5.1.6
*/
public static BufferedReader getUtf8Reader(InputStream in) {
return getReader(in, CharsetUtil.CHARSET_UTF_8);
}
/**
* 获得一个文件读取器
*
* @param in 输入流
* @param charsetName 字符集名称
* @return BufferedReader对象
* @deprecated 请使用 {@link #getReader(InputStream, Charset)}
*/
@Deprecated
public static BufferedReader getReader(InputStream in, String charsetName) {
return getReader(in, Charset.forName(charsetName));
}
/**
* 从{@link BOMInputStream}中获取Reader
*
* @param in {@link BOMInputStream}
* @return {@link BufferedReader}
* @since 5.5.8
*/
public static BufferedReader getReader(BOMInputStream in) {
return getReader(in, in.getCharset());
}
/**
* 从{@link InputStream}中获取{@link BomReader}
*
* @param in {@link InputStream}
* @return {@link BomReader}
* @since 5.7.14
*/
public static BomReader getBomReader(InputStream in) {
return new BomReader(in);
}
/**
* 获得一个Reader
*
* @param in 输入流
* @param charset 字符集
* @return BufferedReader对象
*/
public static BufferedReader getReader(InputStream in, Charset charset) {
if (null == in) {
return null;
}
InputStreamReader reader;
if (null == charset) {
reader = new InputStreamReader(in);
} else {
reader = new InputStreamReader(in, charset);
}
return new BufferedReader(reader);
}
/**
* 获得{@link BufferedReader}
* 如果是{@link BufferedReader}强转返回，否则新建。如果提供的Reader为null返回null
*
* @param reader 普通Reader，如果为null返回null
* @return {@link BufferedReader} or null
* @since 3.0.9
*/
public static BufferedReader getReader(Reader reader) {
if (null == reader) {
return null;
}
return (reader instanceof BufferedReader) ? (BufferedReader) reader : new BufferedReader(reader);
}
/**
* 获得{@link PushbackReader}
* 如果是{@link PushbackReader}强转返回，否则新建
*
* @param reader 普通Reader
* @param pushBackSize 推后的byte数
* @return {@link PushbackReader}
* @since 3.1.0
*/
public static PushbackReader getPushBackReader(Reader reader, int pushBackSize) {
return (reader instanceof PushbackReader) ? (PushbackReader) reader : new PushbackReader(reader, pushBackSize);
}
/**
* 获得一个Writer，默认编码UTF-8
*
* @param out 输入流
* @return OutputStreamWriter对象
* @since 5.1.6
*/
public static OutputStreamWriter getUtf8Writer(OutputStream out) {
return getWriter(out, CharsetUtil.CHARSET_UTF_8);
}
/**
* 获得一个Writer
*
* @param out 输入流
* @param charsetName 字符集
* @return OutputStreamWriter对象
* @deprecated 请使用 {@link #getWriter(OutputStream, Charset)}
*/
@Deprecated
public static OutputStreamWriter getWriter(OutputStream out, String charsetName) {
return getWriter(out, Charset.forName(charsetName));
}
/**
* 获得一个Writer
*
* @param out 输入流
* @param charset 字符集
* @return OutputStreamWriter对象
*/
public static OutputStreamWriter getWriter(OutputStream out, Charset charset) {
if (null == out) {
return null;
}
if (null == charset) {
return new OutputStreamWriter(out);
} else {
return new OutputStreamWriter(out, charset);
}
}
// -------------------------------------------------------------------------------------- getReader and getWriter end
// -------------------------------------------------------------------------------------- read start
/**
* 从流中读取UTF8编码的内容
*
* @param in 输入流
* @return 内容
* @throws IORuntimeException IO异常
* @since 5.4.4
*/
public static String readUtf8(InputStream in) throws IORuntimeException {
return read(in, CharsetUtil.CHARSET_UTF_8);
}
/**
* 从流中读取内容，读取完成后关闭流
*
* @param in 输入流
* @param charsetName 字符集
* @return 内容
* @throws IORuntimeException IO异常
* @deprecated 请使用 {@link #read(InputStream, Charset)}
*/
@Deprecated
public static String read(InputStream in, String charsetName) throws IORuntimeException {
final FastByteArrayOutputStream out = read(in);
return StrUtil.isBlank(charsetName) ? out.toString() : out.toString(charsetName);
}
/**
* 从流中读取内容，读取完毕后关闭流
*
* @param in 输入流，读取完毕后关闭流
* @param charset 字符集
* @return 内容
* @throws IORuntimeException IO异常
*/
public static String read(InputStream in, Charset charset) throws IORuntimeException {
return StrUtil.str(readBytes(in), charset);
}
/**
* 从流中读取内容，读到输出流中，读取完毕后关闭流
*
* @param in 输入流
* @return 输出流
* @throws IORuntimeException IO异常
*/
public static FastByteArrayOutputStream read(InputStream in) throws IORuntimeException {
return read(in, true);
}
/**
* 从流中读取内容，读到输出流中，读取完毕后可选是否关闭流
*
* @param in 输入流
* @param isClose 读取完毕后是否关闭流
* @return 输出流
* @throws IORuntimeException IO异常
* @since 5.5.3
*/
public static FastByteArrayOutputStream read(InputStream in, boolean isClose) throws IORuntimeException {
final FastByteArrayOutputStream out;
if (in instanceof FileInputStream) {
// 文件流的长度是可预见的，此时直接读取效率更高
try {
out = new FastByteArrayOutputStream(in.available());
} catch (IOException e) {
throw new IORuntimeException(e);
}
} else {
out = new FastByteArrayOutputStream();
}
try {
copy(in, out);
} finally {
if (isClose) {
close(in);
}
}
return out;
}
/**
* 从Reader中读取String，读取完毕后关闭Reader
*
* @param reader Reader
* @return String
* @throws IORuntimeException IO异常
*/
public static String read(Reader reader) throws IORuntimeException {
return read(reader, true);
}
/**
* 从{@link Reader}中读取String
*
* @param reader {@link Reader}
* @param isClose 是否关闭{@link Reader}
* @return String
* @throws IORuntimeException IO异常
*/
public static String read(Reader reader, boolean isClose) throws IORuntimeException {
final StringBuilder builder = StrUtil.builder();
final CharBuffer buffer = CharBuffer.allocate(DEFAULT_BUFFER_SIZE);
try {
while (-1 != reader.read(buffer)) {
builder.append(buffer.flip());
}
} catch (IOException e) {
throw new IORuntimeException(e);
} finally {
if (isClose) {
IoUtil.close(reader);
}
}
return builder.toString();
}
/**
* 从流中读取bytes，读取完毕后关闭流
*
* @param in {@link InputStream}
* @return bytes
* @throws IORuntimeException IO异常
*/
public static byte[] readBytes(InputStream in) throws IORuntimeException {
return readBytes(in, true);
}
/**
* 从流中读取bytes
*
* @param in {@link InputStream}
* @param isClose 是否关闭输入流
* @return bytes
* @throws IORuntimeException IO异常
* @since 5.0.4
*/
public static byte[] readBytes(InputStream in, boolean isClose) throws IORuntimeException {
return read(in, isClose).toByteArray();
}
/**
* 读取指定长度的byte数组，不关闭流
*
* @param in {@link InputStream}，为{@code null}返回{@code null}
* @param length 长度，小于等于0返回空byte数组
* @return bytes
* @throws IORuntimeException IO异常
*/
public static byte[] readBytes(InputStream in, int length) throws IORuntimeException {
if (null == in) {
return null;
}
if (length <= 0) {
return new byte[0];
}
final FastByteArrayOutputStream out = new FastByteArrayOutputStream(length);
copy(in, out, DEFAULT_BUFFER_SIZE, length, null);
return out.toByteArray();
}
/**
* 读取16进制字符串
*
* @param in {@link InputStream}
* @param length 长度
* @param toLowerCase true 传换成小写格式 ， false 传换成大写格式
* @return 16进制字符串
* @throws IORuntimeException IO异常
*/
public static String readHex(InputStream in, int length, boolean toLowerCase) throws IORuntimeException {
return HexUtil.encodeHexStr(readBytes(in, length), toLowerCase);
}
/**
* 从流中读取前64个byte并转换为16进制，字母部分使用大写
*
* @param in {@link InputStream}
* @return 16进制字符串
* @throws IORuntimeException IO异常
*/
public static String readHex64Upper(InputStream in) throws IORuntimeException {
return readHex(in, 64, false);
}
/**
* 从流中读取前8192个byte并转换为16进制，字母部分使用大写
*
* @param in {@link InputStream}
* @return 16进制字符串
* @throws IORuntimeException IO异常
*/
public static String readHex8192Upper(InputStream in) throws IORuntimeException {
try {
int i = in.available();
return readHex(in, Math.min(8192, in.available()), false);
} catch (IOException e) {
throw new IORuntimeException(e);
}
}
/**
* 从流中读取前64个byte并转换为16进制，字母部分使用小写
*
* @param in {@link InputStream}
* @return 16进制字符串
* @throws IORuntimeException IO异常
*/
public static String readHex64Lower(InputStream in) throws IORuntimeException {
return readHex(in, 64, true);
}
/**
* 从流中读取对象，即对象的反序列化
*
*
* 注意！！！ 此方法不会检查反序列化安全，可能存在反序列化漏洞风险！！！
*
*
* @param 读取对象的类型
* @param in 输入流
* @return 输出流
* @throws IORuntimeException IO异常
* @throws UtilException ClassNotFoundException包装
*/
public static T readObj(InputStream in) throws IORuntimeException, UtilException {
return readObj(in, null);
}
/**
* 从流中读取对象，即对象的反序列化，读取后不关闭流
*
*
* 注意！！！ 此方法不会检查反序列化安全，可能存在反序列化漏洞风险！！！
*
*
* @param 读取对象的类型
* @param in 输入流
* @param clazz 读取对象类型
* @return 输出流
* @throws IORuntimeException IO异常
* @throws UtilException ClassNotFoundException包装
*/
public static T readObj(InputStream in, Class clazz) throws IORuntimeException, UtilException {
try {
return readObj((in instanceof ValidateObjectInputStream) ?
(ValidateObjectInputStream) in : new ValidateObjectInputStream(in),
clazz);
} catch (IOException e) {
throw new IORuntimeException(e);
}
}
/**
* 从流中读取对象，即对象的反序列化，读取后不关闭流
*
*
* 此方法使用了{@link ValidateObjectInputStream}中的黑白名单方式过滤类，用于避免反序列化漏洞
* 通过构造{@link ValidateObjectInputStream}，调用{@link ValidateObjectInputStream#accept(Class[])}
* 或者{@link ValidateObjectInputStream#refuse(Class[])}方法添加可以被序列化的类或者禁止序列化的类。
*
*
* @param 读取对象的类型
* @param in 输入流，使用{@link ValidateObjectInputStream}中的黑白名单方式过滤类，用于避免反序列化漏洞
* @param clazz 读取对象类型
* @return 输出流
* @throws IORuntimeException IO异常
* @throws UtilException ClassNotFoundException包装
*/
public static T readObj(ValidateObjectInputStream in, Class clazz) throws IORuntimeException, UtilException {
if (in == null) {
throw new IllegalArgumentException("The InputStream must not be null");
}
if(null != clazz){
in.accept(clazz);
}
try {
//noinspection unchecked
return (T) in.readObject();
} catch (IOException e) {
throw new IORuntimeException(e);
} catch (ClassNotFoundException e) {
throw new UtilException(e);
}
}
/**
* 从流中读取内容，使用UTF-8编码
*
* @param 集合类型
* @param in 输入流
* @param collection 返回集合
* @return 内容
* @throws IORuntimeException IO异常
*/
public static > T readUtf8Lines(InputStream in, T collection) throws IORuntimeException {
return readLines(in, CharsetUtil.CHARSET_UTF_8, collection);
}
/**
* 从流中读取内容
*
* @param 集合类型
* @param in 输入流
* @param charsetName 字符集
* @param collection 返回集合
* @return 内容
* @throws IORuntimeException IO异常
* @deprecated 请使用 {@link #readLines(InputStream, Charset, Collection)}
*/
@Deprecated
public static > T readLines(InputStream in, String charsetName, T collection) throws IORuntimeException {
return readLines(in, CharsetUtil.charset(charsetName), collection);
}
/**
* 从流中读取内容
*
* @param 集合类型
* @param in 输入流
* @param charset 字符集
* @param collection 返回集合
* @return 内容
* @throws IORuntimeException IO异常
*/
public static > T readLines(InputStream in, Charset charset, T collection) throws IORuntimeException {
return readLines(getReader(in, charset), collection);
}
/**
* 从Reader中读取内容
*
* @param 集合类型
* @param reader {@link Reader}
* @param collection 返回集合
* @return 内容
* @throws IORuntimeException IO异常
*/
public static > T readLines(Reader reader, T collection) throws IORuntimeException {
readLines(reader, (LineHandler) collection::add);
return collection;
}
/**
* 按行读取UTF-8编码数据，针对每行的数据做处理
*
* @param in {@link InputStream}
* @param lineHandler 行处理接口，实现handle方法用于编辑一行的数据后入到指定地方
* @throws IORuntimeException IO异常
* @since 3.1.1
*/
public static void readUtf8Lines(InputStream in, LineHandler lineHandler) throws IORuntimeException {
readLines(in, CharsetUtil.CHARSET_UTF_8, lineHandler);
}
/**
* 按行读取数据，针对每行的数据做处理
*
* @param in {@link InputStream}
* @param charset {@link Charset}编码
* @param lineHandler 行处理接口，实现handle方法用于编辑一行的数据后入到指定地方
* @throws IORuntimeException IO异常
* @since 3.0.9
*/
public static void readLines(InputStream in, Charset charset, LineHandler lineHandler) throws IORuntimeException {
readLines(getReader(in, charset), lineHandler);
}
/**
* 按行读取数据，针对每行的数据做处理
* {@link Reader}自带编码定义，因此读取数据的编码跟随其编码。
* 此方法不会关闭流，除非抛出异常
*
* @param reader {@link Reader}
* @param lineHandler 行处理接口，实现handle方法用于编辑一行的数据后入到指定地方
* @throws IORuntimeException IO异常
*/
public static void readLines(Reader reader, LineHandler lineHandler) throws IORuntimeException {
Assert.notNull(reader);
Assert.notNull(lineHandler);
for (String line : lineIter(reader)) {
lineHandler.handle(line);
}
}
// -------------------------------------------------------------------------------------- read end
/**
* String 转为流
*
* @param content 内容
* @param charsetName 编码
* @return 字节流
* @deprecated 请使用 {@link #toStream(String, Charset)}
*/
@Deprecated
public static ByteArrayInputStream toStream(String content, String charsetName) {
return toStream(content, CharsetUtil.charset(charsetName));
}
/**
* String 转为流
*
* @param content 内容
* @param charset 编码
* @return 字节流
*/
public static ByteArrayInputStream toStream(String content, Charset charset) {
if (content == null) {
return null;
}
return toStream(StrUtil.bytes(content, charset));
}
/**
* String 转为UTF-8编码的字节流流
*
* @param content 内容
* @return 字节流
* @since 4.5.1
*/
public static ByteArrayInputStream toUtf8Stream(String content) {
return toStream(content, CharsetUtil.CHARSET_UTF_8);
}
/**
* 文件转为{@link FileInputStream}
*
* @param file 文件
* @return {@link FileInputStream}
*/
public static FileInputStream toStream(File file) {
try {
return new FileInputStream(file);
} catch (FileNotFoundException e) {
throw new IORuntimeException(e);
}
}
/**
* byte[] 转为{@link ByteArrayInputStream}
*
* @param content 内容bytes
* @return 字节流
* @since 4.1.8
*/
public static ByteArrayInputStream toStream(byte[] content) {
if (content == null) {
return null;
}
return new ByteArrayInputStream(content);
}
/**
* {@link ByteArrayOutputStream}转为{@link ByteArrayInputStream}
*
* @param out {@link ByteArrayOutputStream}
* @return 字节流
* @since 5.3.6
*/
public static ByteArrayInputStream toStream(ByteArrayOutputStream out) {
if (out == null) {
return null;
}
return new ByteArrayInputStream(out.toByteArray());
}
/**
* 转换为{@link BufferedInputStream}
*
* @param in {@link InputStream}
* @return {@link BufferedInputStream}
* @since 4.0.10
*/
public static BufferedInputStream toBuffered(InputStream in) {
Assert.notNull(in, "InputStream must be not null!");
return (in instanceof BufferedInputStream) ? (BufferedInputStream) in : new BufferedInputStream(in);
}
/**
* 转换为{@link BufferedInputStream}
*
* @param in {@link InputStream}
* @param bufferSize buffer size
* @return {@link BufferedInputStream}
* @since 5.6.1
*/
public static BufferedInputStream toBuffered(InputStream in, int bufferSize) {
Assert.notNull(in, "InputStream must be not null!");
return (in instanceof BufferedInputStream) ? (BufferedInputStream) in : new BufferedInputStream(in, bufferSize);
}
/**
* 转换为{@link BufferedOutputStream}
*
* @param out {@link OutputStream}
* @return {@link BufferedOutputStream}
* @since 4.0.10
*/
public static BufferedOutputStream toBuffered(OutputStream out) {
Assert.notNull(out, "OutputStream must be not null!");
return (out instanceof BufferedOutputStream) ? (BufferedOutputStream) out : new BufferedOutputStream(out);
}
/**
* 转换为{@link BufferedOutputStream}
*
* @param out {@link OutputStream}
* @param bufferSize buffer size
* @return {@link BufferedOutputStream}
* @since 5.6.1
*/
public static BufferedOutputStream toBuffered(OutputStream out, int bufferSize) {
Assert.notNull(out, "OutputStream must be not null!");
return (out instanceof BufferedOutputStream) ? (BufferedOutputStream) out : new BufferedOutputStream(out, bufferSize);
}
/**
* 转换为{@link BufferedReader}
*
* @param reader {@link Reader}
* @return {@link BufferedReader}
* @since 5.6.1
*/
public static BufferedReader toBuffered(Reader reader) {
Assert.notNull(reader, "Reader must be not null!");
return (reader instanceof BufferedReader) ? (BufferedReader) reader : new BufferedReader(reader);
}
/**
* 转换为{@link BufferedReader}
*
* @param reader {@link Reader}
* @param bufferSize buffer size
* @return {@link BufferedReader}
* @since 5.6.1
*/
public static BufferedReader toBuffered(Reader reader, int bufferSize) {
Assert.notNull(reader, "Reader must be not null!");
return (reader instanceof BufferedReader) ? (BufferedReader) reader : new BufferedReader(reader, bufferSize);
}
/**
* 转换为{@link BufferedWriter}
*
* @param writer {@link Writer}
* @return {@link BufferedWriter}
* @since 5.6.1
*/
public static BufferedWriter toBuffered(Writer writer) {
Assert.notNull(writer, "Writer must be not null!");
return (writer instanceof BufferedWriter) ? (BufferedWriter) writer : new BufferedWriter(writer);
}
/**
* 转换为{@link BufferedWriter}
*
* @param writer {@link Writer}
* @param bufferSize buffer size
* @return {@link BufferedWriter}
* @since 5.6.1
*/
public static BufferedWriter toBuffered(Writer writer, int bufferSize) {
Assert.notNull(writer, "Writer must be not null!");
return (writer instanceof BufferedWriter) ? (BufferedWriter) writer : new BufferedWriter(writer, bufferSize);
}
/**
* 将{@link InputStream}转换为支持mark标记的流
* 若原流支持mark标记，则返回原流，否则使用{@link BufferedInputStream} 包装之
*
* @param in 流
* @return {@link InputStream}
* @since 4.0.9
*/
public static InputStream toMarkSupportStream(InputStream in) {
if (null == in) {
return null;
}
if (false == in.markSupported()) {
return new BufferedInputStream(in);
}
return in;
}
/**
* 转换为{@link PushbackInputStream}
* 如果传入的输入流已经是{@link PushbackInputStream}，强转返回，否则新建一个
*
* @param in {@link InputStream}
* @param pushBackSize 推后的byte数
* @return {@link PushbackInputStream}
* @since 3.1.0
*/
public static PushbackInputStream toPushbackStream(InputStream in, int pushBackSize) {
return (in instanceof PushbackInputStream) ? (PushbackInputStream) in : new PushbackInputStream(in, pushBackSize);
}
/**
* 将指定{@link InputStream} 转换为{@link InputStream#available()}方法可用的流。
* 在Socket通信流中，服务端未返回数据情况下{@link InputStream#available()}方法始终为{@code 0}
* 因此，在读取前需要调用{@link InputStream#read()}读取一个字节（未返回会阻塞），一旦读取到了，{@link InputStream#available()}方法就正常了。
* 需要注意的是，在网络流中，是按照块来传输的，所以 {@link InputStream#available()} 读取到的并非最终长度，而是此次块的长度。
* 此方法返回对象的规则为：
*
*
* - FileInputStream 返回原对象，因为文件流的available方法本身可用
* - 其它InputStream 返回PushbackInputStream
*
*
* @param in 被转换的流
* @return 转换后的流，可能为{@link PushbackInputStream}
* @since 5.5.3
*/
public static InputStream toAvailableStream(InputStream in) {
if (in instanceof FileInputStream) {
// FileInputStream本身支持available方法。
return in;
}
final PushbackInputStream pushbackInputStream = toPushbackStream(in, 1);
try {
final int available = pushbackInputStream.available();
if (available <= 0) {
//此操作会阻塞，直到有数据被读到
int b = pushbackInputStream.read();
pushbackInputStream.unread(b);
}
} catch (IOException e) {
throw new IORuntimeException(e);
}
return pushbackInputStream;
}
/**
* 将byte[]写到流中
*
* @param out 输出流
* @param isCloseOut 写入完毕是否关闭输出流
* @param content 写入的内容
* @throws IORuntimeException IO异常
*/
public static void write(OutputStream out, boolean isCloseOut, byte[] content) throws IORuntimeException {
try {
out.write(content);
} catch (IOException e) {
throw new IORuntimeException(e);
} finally {
if (isCloseOut) {
close(out);
}
}
}
/**
* 将多部分内容写到流中，自动转换为UTF-8字符串
*
* @param out 输出流
* @param isCloseOut 写入完毕是否关闭输出流
* @param contents 写入的内容，调用toString()方法，不包括不会自动换行
* @throws IORuntimeException IO异常
* @since 3.1.1
*/
public static void writeUtf8(OutputStream out, boolean isCloseOut, Object... contents) throws IORuntimeException {
write(out, CharsetUtil.CHARSET_UTF_8, isCloseOut, contents);
}
/**
* 将多部分内容写到流中，自动转换为字符串
*
* @param out 输出流
* @param charsetName 写出的内容的字符集
* @param isCloseOut 写入完毕是否关闭输出流
* @param contents 写入的内容，调用toString()方法，不包括不会自动换行
* @throws IORuntimeException IO异常
* @deprecated 请使用 {@link #write(OutputStream, Charset, boolean, Object...)}
*/
@Deprecated
public static void write(OutputStream out, String charsetName, boolean isCloseOut, Object... contents) throws IORuntimeException {
write(out, CharsetUtil.charset(charsetName), isCloseOut, contents);
}
/**
* 将多部分内容写到流中，自动转换为字符串
*
* @param out 输出流
* @param charset 写出的内容的字符集
* @param isCloseOut 写入完毕是否关闭输出流
* @param contents 写入的内容，调用toString()方法，不包括不会自动换行
* @throws IORuntimeException IO异常
* @since 3.0.9
*/
public static void write(OutputStream out, Charset charset, boolean isCloseOut, Object... contents) throws IORuntimeException {
OutputStreamWriter osw = null;
try {
osw = getWriter(out, charset);
for (Object content : contents) {
if (content != null) {
osw.write(Convert.toStr(content, StrUtil.EMPTY));
}
}
osw.flush();
} catch (IOException e) {
throw new IORuntimeException(e);
} finally {
if (isCloseOut) {
close(osw);
}
}
}
/**
* 将多部分内容写到流中
*
* @param out 输出流
* @param isCloseOut 写入完毕是否关闭输出流
* @param obj 写入的对象内容
* @throws IORuntimeException IO异常
* @since 5.3.3
*/
public static void writeObj(OutputStream out, boolean isCloseOut, Serializable obj) throws IORuntimeException {
writeObjects(out, isCloseOut, obj);
}
/**
* 将多部分内容写到流中
*
* @param out 输出流
* @param isCloseOut 写入完毕是否关闭输出流
* @param contents 写入的内容
* @throws IORuntimeException IO异常
*/
public static void writeObjects(OutputStream out, boolean isCloseOut, Serializable... contents) throws IORuntimeException {
ObjectOutputStream osw = null;
try {
osw = out instanceof ObjectOutputStream ? (ObjectOutputStream) out : new ObjectOutputStream(out);
for (Object content : contents) {
if (content != null) {
osw.writeObject(content);
}
}
osw.flush();
} catch (IOException e) {
throw new IORuntimeException(e);
} finally {
if (isCloseOut) {
close(osw);
}
}
}
/**
* 从缓存中刷出数据
*
* @param flushable {@link Flushable}
* @since 4.2.2
*/
public static void flush(Flushable flushable) {
if (null != flushable) {
try {
flushable.flush();
} catch (Exception e) {
// 静默刷出
}
}
}
/**
* 关闭
* 关闭失败不会抛出异常
*
* @param closeable 被关闭的对象
*/
public static void close(Closeable closeable) {
if (null != closeable) {
try {
closeable.close();
} catch (Exception e) {
// 静默关闭
}
}
}
/**
* 尝试关闭指定对象
* 判断对象如果实现了{@link AutoCloseable}，则调用之
*
* @param obj 可关闭对象
* @since 4.3.2
*/
public static void closeIfPosible(Object obj) {
if (obj instanceof AutoCloseable) {
close((AutoCloseable) obj);
}
}
/**
* 对比两个流内容是否相同
* 内部会转换流为 {@link BufferedInputStream}
*
* @param input1 第一个流
* @param input2 第二个流
* @return 两个流的内容一致返回true，否则false
* @throws IORuntimeException IO异常
* @since 4.0.6
*/
public static boolean contentEquals(InputStream input1, InputStream input2) throws IORuntimeException {
if (false == (input1 instanceof BufferedInputStream)) {
input1 = new BufferedInputStream(input1);
}
if (false == (input2 instanceof BufferedInputStream)) {
input2 = new BufferedInputStream(input2);
}
try {
int ch = input1.read();
while (EOF != ch) {
int ch2 = input2.read();
if (ch != ch2) {
return false;
}
ch = input1.read();
}
int ch2 = input2.read();
return ch2 == EOF;
} catch (IOException e) {
throw new IORuntimeException(e);
}
}
/**
* 对比两个Reader的内容是否一致
* 内部会转换流为 {@link BufferedInputStream}
*
* @param input1 第一个reader
* @param input2 第二个reader
* @return 两个流的内容一致返回true，否则false
* @throws IORuntimeException IO异常
* @since 4.0.6
*/
public static boolean contentEquals(Reader input1, Reader input2) throws IORuntimeException {
input1 = getReader(input1);
input2 = getReader(input2);
try {
int ch = input1.read();
while (EOF != ch) {
int ch2 = input2.read();
if (ch != ch2) {
return false;
}
ch = input1.read();
}
int ch2 = input2.read();
return ch2 == EOF;
} catch (IOException e) {
throw new IORuntimeException(e);
}
}
/**
* 对比两个流内容是否相同，忽略EOL字符
* 内部会转换流为 {@link BufferedInputStream}
*
* @param input1 第一个流
* @param input2 第二个流
* @return 两个流的内容一致返回true，否则false
* @throws IORuntimeException IO异常
* @since 4.0.6
*/
public static boolean contentEqualsIgnoreEOL(Reader input1, Reader input2) throws IORuntimeException {
final BufferedReader br1 = getReader(input1);
final BufferedReader br2 = getReader(input2);
try {
String line1 = br1.readLine();
String line2 = br2.readLine();
while (line1 != null && line1.equals(line2)) {
line1 = br1.readLine();
line2 = br2.readLine();
}
return Objects.equals(line1, line2);
} catch (IOException e) {
throw new IORuntimeException(e);
}
}
/**
* 计算流CRC32校验码，计算后关闭流
*
* @param in 文件，不能为目录
* @return CRC32值
* @throws IORuntimeException IO异常
* @since 4.0.6
*/
public static long checksumCRC32(InputStream in) throws IORuntimeException {
return checksum(in, new CRC32()).getValue();
}
/**
* 计算流的校验码，计算后关闭流
*
* @param in 流
* @param checksum {@link Checksum}
* @return Checksum
* @throws IORuntimeException IO异常
* @since 4.0.10
*/
public static Checksum checksum(InputStream in, Checksum checksum) throws IORuntimeException {
Assert.notNull(in, "InputStream is null !");
if (null == checksum) {
checksum = new CRC32();
}
try {
in = new CheckedInputStream(in, checksum);
IoUtil.copy(in, new NullOutputStream());
} finally {
IoUtil.close(in);
}
return checksum;
}
/**
* 计算流的校验码，计算后关闭流
*
* @param in 流
* @param checksum {@link Checksum}
* @return Checksum
* @throws IORuntimeException IO异常
* @since 5.4.0
*/
public static long checksumValue(InputStream in, Checksum checksum) {
return checksum(in, checksum).getValue();
}
/**
* 返回行遍历器
*
* LineIterator it = null;
* try {
* it = IoUtil.lineIter(reader);
* while (it.hasNext()) {
* String line = it.nextLine();
* // do something with line
* }
* } finally {
* it.close();
* }
*
*
* @param reader {@link Reader}
* @return {@link LineIter}
* @since 5.6.1
*/
public static LineIter lineIter(Reader reader) {
return new LineIter(reader);
}
/**
* 返回行遍历器
*
* LineIterator it = null;
* try {
* it = IoUtil.lineIter(in, CharsetUtil.CHARSET_UTF_8);
* while (it.hasNext()) {
* String line = it.nextLine();
* // do something with line
* }
* } finally {
* it.close();
* }
*
*
* @param in {@link InputStream}
* @param charset 编码
* @return {@link LineIter}
* @since 5.6.1
*/
public static LineIter lineIter(InputStream in, Charset charset) {
return new LineIter(in, charset);
}
/**
* {@link ByteArrayOutputStream} 转换为String
* @param out {@link ByteArrayOutputStream}
* @param charset 编码
* @return 字符串
* @since 5.7.17
*/
public static String toStr(ByteArrayOutputStream out, Charset charset){
try {
return out.toString(charset.name());
} catch (UnsupportedEncodingException e) {
throw new IORuntimeException(e);
}
}
}
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