uTools-Manuals/docs/java/javax/imageio/stream/FileImageInputStream.html

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     javax.imageio.stream 
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<h2 class="title" title="Class FileImageInputStream">Class FileImageInputStream</h2>
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<li><a href="../../../java/lang/Object.html" title="class in java.lang">java.lang.Object</a></li>
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<li><a href="../../../javax/imageio/stream/ImageInputStreamImpl.html" title="class in javax.imageio.stream">javax.imageio.stream.ImageInputStreamImpl</a></li>
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<li>javax.imageio.stream.FileImageInputStream</li>
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<dt>
         All Implemented Interfaces: 
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<span><a href="../../../java/io/Closeable.html" title="java.io中的接口">Closeable</a> ， <a href="../../../java/io/DataInput.html" title="java.io中的接口">DataInput</a> ， <a href="../../../java/lang/AutoCloseable.html" title="java.lang中的接口">AutoCloseable</a> ， <a href="../../../javax/imageio/stream/ImageInputStream.html" title="javax.imageio.stream中的接口">ImageInputStream</a></span>
</dd>
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<hr/> <br/> <pre>public class <span class="typeNameLabel">FileImageInputStream</span>
extends <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html" title="class in javax.imageio.stream">ImageInputStreamImpl</a></pre>
<div class="block">
<span>一个ImageInputStream的<code>ImageInputStream</code> ，从<code>File</code>或<code>RandomAccessFile</code>获取它的输入。</span>
<span>假设文件内容在对象的生存期内是稳定的。</span>
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<!-- --> </a> <h3>Fields inherited from class javax.imageio.stream.<a href="../../../javax/imageio/stream/ImageInputStreamImpl.html" title="class in javax.imageio.stream">ImageInputStreamImpl</a></h3> <code><a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#bitOffset">bitOffset</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#byteOrder">byteOrder</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#flushedPos">flushedPos</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#streamPos">streamPos</a></code></li>
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<caption>
<span>构造方法</span>
<span class="tabEnd"> </span>
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<tbody>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
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<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../javax/imageio/stream/FileImageInputStream.html#FileImageInputStream-java.io.File-">FileImageInputStream</a></span>(<a href="../../../java/io/File.html" title="class in java.io">File</a> f)</code>
<div class="block">
              构造一个 
             <code>FileImageInputStream</code> ，它将从给定的 
             <code>File</code>读取。 
            </div> </td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../javax/imageio/stream/FileImageInputStream.html#FileImageInputStream-java.io.RandomAccessFile-">FileImageInputStream</a></span>(<a href="../../../java/io/RandomAccessFile.html" title="class in java.io">RandomAccessFile</a> raf)</code>
<div class="block">
              构造一个 
             <code>FileImageInputStream</code> ，它将从给定的 
             <code>RandomAccessFile</code>读取。 
            </div> </td>
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<span class="activeTableTab" id="t0"><span>所有方法</span><span class="tabEnd"> </span></span>
<span class="tableTab" id="t2"><span><a href="javascript:show(2);">接口方法</a></span><span class="tabEnd"> </span></span>
<span class="tableTab" id="t4"><span><a href="javascript:show(8);">具体的方法</a></span><span class="tabEnd"> </span></span>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<tr class="altColor" id="i0">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/imageio/stream/FileImageInputStream.html#close--">close</a></span>()</code>
<div class="block">
              关闭流。 
            </div> </td>
</tr>
<tr class="rowColor" id="i1">
<td class="colFirst"><code>protected void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/imageio/stream/FileImageInputStream.html#finalize--">finalize</a></span>()</code>
<div class="block">
              在垃圾收集之前完成此对象。 
            </div> </td>
</tr>
<tr class="altColor" id="i2">
<td class="colFirst"><code>long</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/imageio/stream/FileImageInputStream.html#length--">length</a></span>()</code>
<div class="block">
              返回底层文件的长度，如果未知，则返回 
             <code>-1</code> 。 
            </div> </td>
</tr>
<tr class="rowColor" id="i3">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/imageio/stream/FileImageInputStream.html#read--">read</a></span>()</code>
<div class="block">
              从流中读取一个字节，并将其作为0和255之间的 
             <code>int</code>返回。 
            </div> </td>
</tr>
<tr class="altColor" id="i4">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/imageio/stream/FileImageInputStream.html#read-byte:A-int-int-">read</a></span>(byte[] b, int off, int len)</code>
<div class="block">
              从流中读取最多 
             <code>len</code>个字节，并将其存储在 
             <code>b</code>从索引 
             <code>off</code>开始。 
            </div> </td>
</tr>
<tr class="rowColor" id="i5">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../javax/imageio/stream/FileImageInputStream.html#seek-long-">seek</a></span>(long pos)</code>
<div class="block">
              将当前流位置设置为所需位置。 
            </div> </td>
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<!-- --> </a> <h3>Methods inherited from class javax.imageio.stream.<a href="../../../javax/imageio/stream/ImageInputStreamImpl.html" title="class in javax.imageio.stream">ImageInputStreamImpl</a></h3> <code><a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#checkClosed--">checkClosed</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#flush--">flush</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#flushBefore-long-">flushBefore</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#getBitOffset--">getBitOffset</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#getByteOrder--">getByteOrder</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#getFlushedPosition--">getFlushedPosition</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#getStreamPosition--">getStreamPosition</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#isCached--">isCached</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#isCachedFile--">isCachedFile</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#isCachedMemory--">isCachedMemory</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#mark--">mark</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#read-byte:A-">read</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readBit--">readBit</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readBits-int-">readBits</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readBoolean--">readBoolean</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readByte--">readByte</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readBytes-javax.imageio.stream.IIOByteBuffer-int-">readBytes</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readChar--">readChar</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readDouble--">readDouble</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readFloat--">readFloat</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readFully-byte:A-">readFully</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readFully-byte:A-int-int-">readFully</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readFully-char:A-int-int-">readFully</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readFully-double:A-int-int-">readFully</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readFully-float:A-int-int-">readFully</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readFully-int:A-int-int-">readFully</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readFully-long:A-int-int-">readFully</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readFully-short:A-int-int-">readFully</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readInt--">readInt</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readLine--">readLine</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readLong--">readLong</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readShort--">readShort</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readUnsignedByte--">readUnsignedByte</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readUnsignedInt--">readUnsignedInt</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readUnsignedShort--">readUnsignedShort</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#readUTF--">readUTF</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#reset--">reset</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#setBitOffset-int-">setBitOffset</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#setByteOrder-java.nio.ByteOrder-">setByteOrder</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#skipBytes-int-">skipBytes</a>, <a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#skipBytes-long-">skipBytes</a></code></li>
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<li class="blockList"><a name="constructor.detail">
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<ul class="blockList">
<li class="blockList"> <h4>FileImageInputStream</h4> <pre>public FileImageInputStream(<a href="../../../java/io/File.html" title="class in java.io">File</a> f)
                     throws <a href="../../../java/io/FileNotFoundException.html" title="class in java.io">FileNotFoundException</a>,
                            <a href="../../../java/io/IOException.html" title="class in java.io">IOException</a></pre>
<div class="block">
<span>构造一个<code>FileImageInputStream</code> ，将从给定的<code>File</code>读取。</span>
<p> <span>文件内容不得在此对象构建时间与上一次调用read方法的时间之间发生变化。</span> </p>
</div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>f</code> - a 
            <code>File</code>读取。 
           </dd>
<dt>
<span class="throwsLabel">异常</span>
</dt>
<dd>
<code><a href="../../../java/lang/IllegalArgumentException.html" title="class in java.lang">IllegalArgumentException</a></code> - 如果 
            <code>f</code>是 
            <code>null</code> 。 
           </dd>
<dd>
<code><a href="../../../java/lang/SecurityException.html" title="class in java.lang">SecurityException</a></code> - 如果安全管理器存在，并且不允许对该文件的读取访问。 
           </dd>
<dd>
<code><a href="../../../java/io/FileNotFoundException.html" title="class in java.io">FileNotFoundException</a></code> - 如果 
            <code>f</code>是一个目录，或由于任何其他原因无法打开阅读。 
           </dd>
<dd>
<code><a href="../../../java/io/IOException.html" title="class in java.io">IOException</a></code> - 如果发生I / O错误。 
           </dd>
</dl> </li>
</ul> <a name="FileImageInputStream-java.io.RandomAccessFile-">
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<li class="blockList"> <h4>FileImageInputStream</h4> <pre>public FileImageInputStream(<a href="../../../java/io/RandomAccessFile.html" title="class in java.io">RandomAccessFile</a> raf)</pre>
<div class="block">
<span>构造一个<code>FileImageInputStream</code> ，将从给定的<code>RandomAccessFile</code>读取。</span>
<p> <span>文件内容不得在此对象构建时间与上一次调用read方法的时间之间发生变化。</span> </p>
</div>
<dl>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>raf</code> - a 
            <code>RandomAccessFile</code>要阅读。 
           </dd>
<dt>
<span class="throwsLabel">异常</span>
</dt>
<dd>
<code><a href="../../../java/lang/IllegalArgumentException.html" title="class in java.lang">IllegalArgumentException</a></code> - 如果 
            <code>raf</code>是 
            <code>null</code> 。 
           </dd>
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<li class="blockList"> <h4>read</h4> <pre>public int read()
         throws <a href="../../../java/io/IOException.html" title="class in java.io">IOException</a></pre>
<div class="block">
<span class="descfrmTypeLabel">描述从类别复制： <code><a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#read--">ImageInputStreamImpl</a></code></span>
</div>
<div class="block">
<span>从该流读取单个字节，并返回它作为一个<code>int</code> 255之间0和如果达到EOF， <code>-1</code>被返回。</span>
<p> <span>子类必须为此方法提供一个实现。</span> <span>子类实现应该在退出之前更新流位置。</span> </p>
<p> <span>在发生读取之前，流内的位偏移必须重置为零。</span> </p>
</div>
<dl>
<dt>
<span class="overrideSpecifyLabel">Specified by:</span>
</dt>
<dd>
<code><a href="../../../javax/imageio/stream/ImageInputStream.html#read--">read</a></code>在接口 
            <code><a href="../../../javax/imageio/stream/ImageInputStream.html" title="interface in javax.imageio.stream">ImageInputStream</a></code>
</dd>
<dt>
<span class="overrideSpecifyLabel">Specified by:</span>
</dt>
<dd>
<code><a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#read--">read</a></code>在 
            <code><a href="../../../javax/imageio/stream/ImageInputStreamImpl.html" title="class in javax.imageio.stream">ImageInputStreamImpl</a></code>
</dd>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             流中下一个字节的值，如果达到EOF， 
            <code>-1</code> 。 
           </dd>
<dt>
<span class="throwsLabel">异常</span>
</dt>
<dd>
<code><a href="../../../java/io/IOException.html" title="class in java.io">IOException</a></code> - 如果流已关闭。 
           </dd>
</dl> </li>
</ul> <a name="read-byte:A-int-int-">
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<ul class="blockList">
<li class="blockList"> <h4>read</h4> <pre>public int read(byte[] b,
                int off,
                int len)
         throws <a href="../../../java/io/IOException.html" title="class in java.io">IOException</a></pre>
<div class="block">
<span class="descfrmTypeLabel">描述从类别复制： <code><a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#read-byte:A-int-int-">ImageInputStreamImpl</a></code></span>
</div>
<div class="block">
<span>读取到<code>len</code>从流字节，并将其存储到<code>b</code>开始于索引<code>off</code> 。</span>
<span>如果没有读取字节，因为已经到达流的末尾，则返回<code>-1</code> 。</span>
<p> <span>在发生读取之前，流内的位偏移必须重置为零。</span> </p>
<p> <span>子类必须为此方法提供一个实现。</span> <span>子类实现应该在退出之前更新流位置。</span> </p>
</div>
<dl>
<dt>
<span class="overrideSpecifyLabel">Specified by:</span>
</dt>
<dd>
<code><a href="../../../javax/imageio/stream/ImageInputStream.html#read-byte:A-int-int-">read</a></code>在接口 
            <code><a href="../../../javax/imageio/stream/ImageInputStream.html" title="interface in javax.imageio.stream">ImageInputStream</a></code>
</dd>
<dt>
<span class="overrideSpecifyLabel">Specified by:</span>
</dt>
<dd>
<code><a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#read-byte:A-int-int-">read</a></code>在 
            <code><a href="../../../javax/imageio/stream/ImageInputStreamImpl.html" title="class in javax.imageio.stream">ImageInputStreamImpl</a></code>
</dd>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>b</code> - 要写入的字节数组。 
           </dd>
<dd>
<code>off</code> -内的起始位置 
            <code>b</code>写。 
           </dd>
<dd>
<code>len</code> - 要读取的最大字节数。 
           </dd>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             实际读取的字节数，或 
            <code>-1</code>表示EOF。 
           </dd>
<dt>
<span class="throwsLabel">异常</span>
</dt>
<dd>
<code><a href="../../../java/io/IOException.html" title="class in java.io">IOException</a></code> - 如果发生I / O错误。 
           </dd>
</dl> </li>
</ul> <a name="length--">
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<ul class="blockList">
<li class="blockList"> <h4>length</h4> <pre>public long length()</pre>
<div class="block">
            返回底层文件的长度，如果未知，则返回 
           <code>-1</code> 。 
          </div>
<dl>
<dt>
<span class="overrideSpecifyLabel">Specified by:</span>
</dt>
<dd>
<code><a href="../../../javax/imageio/stream/ImageInputStream.html#length--">length</a></code>中的 
            <code><a href="../../../javax/imageio/stream/ImageInputStream.html" title="interface in javax.imageio.stream">ImageInputStream</a></code>
</dd>
<dt>
<span class="overrideSpecifyLabel">重写：</span>
</dt>
<dd>
<code><a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#length--">length</a></code>在 
            <code><a href="../../../javax/imageio/stream/ImageInputStreamImpl.html" title="class in javax.imageio.stream">ImageInputStreamImpl</a></code>
</dd>
<dt>
<span class="returnLabel">结果</span>
</dt>
<dd>
             文件长度为 
            <code>long</code> ，或 
            <code>-1</code> 。 
           </dd>
</dl> </li>
</ul> <a name="seek-long-">
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<ul class="blockList">
<li class="blockList"> <h4>seek</h4> <pre>public void seek(long pos)
          throws <a href="../../../java/io/IOException.html" title="class in java.io">IOException</a></pre>
<div class="block">
<span class="descfrmTypeLabel">从接口复制： <code><a href="../../../javax/imageio/stream/ImageInputStream.html#seek-long-">ImageInputStream</a></code></span>
</div>
<div class="block">
<span>将当前流位置设置为所需位置。</span>
<span>下一次读取将发生在此位置。</span>
<span>位偏移设置为0。</span>
<p> <span>一个<code>IndexOutOfBoundsException</code>如果将被抛出<code>pos</code>比冲洗位置（如通过返回较小<code>getflushedPosition</code> ）。</span> </p>
<p> <span>寻求文件结尾是合法的;</span> <span>一个<code>java.io.EOFException</code>会，如果执行读取只抛出。</span> </p>
</div>
<dl>
<dt>
<span class="overrideSpecifyLabel">Specified by:</span>
</dt>
<dd>
<code><a href="../../../javax/imageio/stream/ImageInputStream.html#seek-long-">seek</a></code>中的 
            <code><a href="../../../javax/imageio/stream/ImageInputStream.html" title="interface in javax.imageio.stream">ImageInputStream</a></code>
</dd>
<dt>
<span class="overrideSpecifyLabel">重写：</span>
</dt>
<dd>
<code><a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#seek-long-">seek</a></code>在 
            <code><a href="../../../javax/imageio/stream/ImageInputStreamImpl.html" title="class in javax.imageio.stream">ImageInputStreamImpl</a></code>
</dd>
<dt>
<span class="paramLabel">参数</span>
</dt>
<dd>
<code>pos</code> -一个 
            <code>long</code>含有所需文件的指针位置。 
           </dd>
<dt>
<span class="throwsLabel">异常</span>
</dt>
<dd>
<code><a href="../../../java/io/IOException.html" title="class in java.io">IOException</a></code> - 如果发生任何其他I / O错误。 
           </dd>
</dl> </li>
</ul> <a name="close--">
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<li class="blockList"> <h4>close</h4> <pre>public void close()
           throws <a href="../../../java/io/IOException.html" title="class in java.io">IOException</a></pre>
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<span class="descfrmTypeLabel">说明从界面： <code><a href="../../../javax/imageio/stream/ImageInputStream.html#close--">ImageInputStream</a></code>复制</span>
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<div class="block">
<span>关闭流。</span>
<span>尝试访问已关闭的流可能会导致<code>IOException</code>或错误的行为。</span>
<span>调用此方法可能允许实现此接口的类释放与流相关的资源，如内存，磁盘空间或文件描述符。</span>
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<dl>
<dt>
<span class="overrideSpecifyLabel">Specified by:</span>
</dt>
<dd>
<code><a href="../../../java/io/Closeable.html#close--">close</a></code>在接口 
            <code><a href="../../../java/io/Closeable.html" title="interface in java.io">Closeable</a></code>
</dd>
<dt>
<span class="overrideSpecifyLabel">Specified by:</span>
</dt>
<dd>
<code><a href="../../../java/lang/AutoCloseable.html#close--">close</a></code>在接口 
            <code><a href="../../../java/lang/AutoCloseable.html" title="interface in java.lang">AutoCloseable</a></code>
</dd>
<dt>
<span class="overrideSpecifyLabel">Specified by:</span>
</dt>
<dd>
<code><a href="../../../javax/imageio/stream/ImageInputStream.html#close--">close</a></code>在接口 
            <code><a href="../../../javax/imageio/stream/ImageInputStream.html" title="interface in javax.imageio.stream">ImageInputStream</a></code>
</dd>
<dt>
<span class="overrideSpecifyLabel">重写：</span>
</dt>
<dd>
<code><a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#close--">close</a></code>在 
            <code><a href="../../../javax/imageio/stream/ImageInputStreamImpl.html" title="class in javax.imageio.stream">ImageInputStreamImpl</a></code>
</dd>
<dt>
<span class="throwsLabel">异常</span>
</dt>
<dd>
<code><a href="../../../java/io/IOException.html" title="class in java.io">IOException</a></code> - 如果发生I / O错误。 
           </dd>
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<li class="blockList"> <h4>finalize</h4> <pre>protected void finalize()
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<span>在垃圾收集之前完成此对象。</span>
<span>调用<code>close</code>方法来关闭任何打开的输入源。</span>
<span>不应该从应用程序代码调用此方法。</span>
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<dl>
<dt>
<span class="overrideSpecifyLabel">重写：</span>
</dt>
<dd>
<code><a href="../../../javax/imageio/stream/ImageInputStreamImpl.html#finalize--">finalize</a></code>在 
            <code><a href="../../../javax/imageio/stream/ImageInputStreamImpl.html" title="class in javax.imageio.stream">ImageInputStreamImpl</a></code>
</dd>
<dt>
<span class="throwsLabel">异常</span>
</dt>
<dd>
<code><a href="../../../java/lang/Throwable.html" title="class in java.lang">Throwable</a></code> - 如果在超类最终化期间发生错误。 
           </dd>
<dt>
<span class="seeLabel">另请参见：</span>
</dt>
<dd>
<a href="../../../java/lang/ref/WeakReference.html" title="class in java.lang.ref"><code>WeakReference</code></a>, 
            <a href="../../../java/lang/ref/PhantomReference.html" title="class in java.lang.ref"><code>PhantomReference</code></a>
</dd>
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</ul> </li>
</ul> </li>
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