Java中input与output_Java中的InputStream和OutputStream

Java中的InputStream和OutputStream

做Java技术好几个月了,碰到了很多琐碎细小的技术点,一直没有记录。“勿以善小而不为”,正好今天有点空,先从两个Stream说起。

InputStream vs OutputStream

InputStream用来进行数据读取,而OutputStream用来进行数据写入。接口描述:

public abstract class InputStream implements Closeable {

public abstract int read() throws IOException;

public int read(byte b[]) throws IOException;

public int read(byte b[], int off, int len) throws IOException;

public long skip(long n) throws IOException;

public void close() throws IOException;

public synchronized void mark(int readlimit);

public synchronized void reset() throws IOException;

//...

}

public abstract class OutputStream implements Closeable, Flushable {

public abstract void write(int b) throws IOException;

public void write(byte b[]) throws IOException;

public void write(byte b[], int off, int len) throws IOException;

public void flush() throws IOException;

public void close() throws IOException;

}

Close Streams

Java中的Stream是需要通过close方法显式进行关闭的。OutputStream上面还有一个方法叫flush,close方法会自动执行flush。所以在调用close之前无需调用flush方法。

如果一个Stream在构建的时候,通过构造函数传入另外一个Stream,当该Stream被close的时候,原始的Stream也会被关闭,参见如下代码:

OutputStream file = new FileOutputStream( "quarks.ser" );

OutputStream buffer = new BufferedOutputStream( file );

ObjectOutput output = new ObjectOutputStream( buffer );

try{

output.writeObject(quarks);

}

finally{

output.close();

}

派生类

有时间的话会把每个派生类简单解释一下。

Java中的InputStream和OutputStream 做Java技术好几个月了,碰到了很多琐碎细小的技术点,一直没有记录。“勿以善小而不为”,正好今天有点空,先从两个Stream说起。 InputStream vs OutputStream InputStream用来进行数据读取,而OutputStream用来进行数据写入。接口描述: public abstract class InputStream implements Closeable { public abstract int read() throws IOException; public int read(byte b[]) throws IOException; public int read(byte b[], int off, int len) throws IOException; public long skip(long n) throws IOException; public void close() throws IOException; public synchronized void mark(int readlimit); public synchronized void reset() throws IOException; //... } public abstract class OutputStream implements Closeable, Flushable { public abstract void write(int b) throws IOException; public void write(byte b[]) throws IOException; public void write(byte b[], int off, int len) throws IOException; public void flush() throws IOException; public void close() throws IOException; } Close Streams Java中的Stream是需要通过close方法显式进行关闭的。OutputStream上面还有一个方法叫flush,close方法会自动执行flush。所以在调用close之前无需调用flush方法。 如果一个Stream在构建的时候,通过构造函数传入另外一个Stream,当该Stream被close的时候,原始的Stream也会被关闭,参见如下代码: OutputStream file = new FileOutputStream( "quarks.ser" ); OutputStream buffer = new BufferedOutputStream( file ); ObjectOutput output = new ObjectOutputStream( buffer ); try{ output.writeObject(quarks); } finally{ output.close(); } 派生类 有时间的话会把每个派生类简单解释一下。
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