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<p style="text-indent:2em">圖檔處理是當今軟體開發中非常重要的一環，然而處理圖檔的開源架構卻并不多。現金網上流傳的<a href="http://lib.csdn.net/base/java" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" class="replace_word" title="Java 知識庫" target="_blank" style="color:#df3434; font-weight:bold;">Java</a>處理圖檔的代碼，雖然可對圖檔進行簡單處理，但效果并不理想。雖然也有些其他解決方案，但都擺脫不了繁瑣，使用起來十分不友善。</p>
<p style="text-indent:2em">為了解決這個問題，我也是在網上找了好久，看了很多資料，功夫不負有心人，最終找到了一個處理圖檔十分棒的開源架構。特此拿出來與大家分享。</p>
<p style="text-indent:2em"><br>
</p>
<p style="text-indent:2em">Thumbnailator 是一個優秀的圖檔處理的Google開源Java類庫。處理效果遠比<a href="http://lib.csdn.net/base/java" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" class="replace_word" title="Java 知識庫" target="_blank" style="color:#df3434; font-weight:bold;">Java </a>API的好。從API提供現有的圖像檔案和圖像對象的類中簡化了處理過程，兩三行代碼就能夠從現有圖檔生成處理後的圖檔，且允許微調圖檔的生成方式，同時保持了需要寫入的最低限度的代碼量。還支援對一個目錄的所有圖檔進行批量處理操作。</p>
<p style="text-indent:2em">支援的處理操作：圖檔縮放，區域裁剪，水印，旋轉，保持比例。</p>
<p style="text-indent:2em">另外值得一提的是，Thumbnailator至今仍不斷更新，怎麼樣，感覺很有保障吧！</p>
<p style="text-indent:2em">Thumbnailator官網：<a target="_blank" href="http://code.google.com/p/thumbnailator/" target="_blank" rel="external nofollow" >http://code.google.com/p/thumbnailator/</a></p>
<p style="text-indent:2em">下面我們介紹下如何使用Thumbnailator</p>
<p style="text-indent:2em">原圖：</p>
<p><img alt="" src="https://img-blog.csdn.net/20131227172325812?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvd2FuZ3BlbmcwNDc=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center"></p>
<p style="text-indent:2em">1、指定大小進行縮放</p>
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<ol class="dp-j" start="1">
<li class="alt"><span><span class="comment">//size(寬度, 高度)</span><span> </span></span></li><li><span> </span></li><li class="alt"><span><span class="comment">/*</span> </span></li><li><span><span class="comment"> * 若圖檔橫比200小，高比300小，不變</span> </span></li><li class="alt"><span><span class="comment"> * 若圖檔橫比200小，高比300大，高縮小到300，圖檔比例不變</span> </span></li><li><span><span class="comment"> * 若圖檔橫比200大，高比300小，橫縮小到200，圖檔比例不變</span> </span></li><li class="alt"><span><span class="comment"> * 若圖檔橫比200大，高比300大，圖檔按比例縮小，橫為200或高為300</span> </span></li><li><span><span class="comment"> */</span><span> </span></span></li><li class="alt"><span>Thumbnails.of(<span class="string">"images/a380_1280x1024.jpg"</span><span>) </span></span></li><li><span> .size(<span class="number">200</span><span>, </span><span class="number">300</span><span>) </span></span></li><li class="alt"><span> .toFile(<span class="string">"c:/a380_200x300.jpg"</span><span>); </span></span></li><li><span> </span></li><li class="alt"><span>Thumbnails.of(<span class="string">"images/a380_1280x1024.jpg"</span><span>) </span></span></li><li><span> .size(<span class="number">2560</span><span>, </span><span class="number">2048</span><span>) </span></span></li><li class="alt"><span> .toFile(<span class="string">"c:/a380_2560x2048.jpg"</span><span>); </span></span></li></ol>
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<p><br>
</p>
<p style="text-indent:2em">2、按照比例進行縮放</p>
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<ol class="dp-j" start="1">
<li class="alt"><span><span class="comment">//scale(比例)</span><span> </span></span></li><li><span>Thumbnails.of(<span class="string">"images/a380_1280x1024.jpg"</span><span>) </span></span></li><li class="alt"><span> .scale(<span class="number">0</span><span>.25f) </span></span></li><li><span> .toFile(<span class="string">"c:/a380_25%.jpg"</span><span>); </span></span></li><li class="alt"><span> </span></li><li><span>Thumbnails.of(<span class="string">"images/a380_1280x1024.jpg"</span><span>) </span></span></li><li class="alt"><span> .scale(<span class="number">1</span><span>.10f) </span></span></li><li><span> .toFile(<span class="string">"c:/a380_110%.jpg"</span><span>); </span></span></li></ol>
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<p><br>
</p>
<p style="text-indent:2em">3、不按照比例，指定大小進行縮放</p>
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<ol class="dp-j" start="1">
<li class="alt"><span><span class="comment">//keepAspectRatio(false)預設是按照比例縮放的</span><span> </span></span></li><li><span>Thumbnails.of(<span class="string">"images/a380_1280x1024.jpg"</span><span>) </span></span></li><li class="alt"><span> .size(<span class="number">200</span><span>,</span><span class="number">200</span><span>) </span></span></li><li><span> .keepAspectRatio(<span class="keyword">false</span><span>) </span></span></li><li class="alt"><span> .toFile(<span class="string">"c:/a380_200x200.jpg"</span><span>); </span></span></li></ol>
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<p><br>
</p>
<p style="text-indent:2em">4、旋轉</p>
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<ol class="dp-j" start="1">
<li class="alt"><span><span class="comment">//rotate(角度),正數：順時針負數：逆時針</span><span> </span></span></li><li><span>Thumbnails.of(<span class="string">"images/a380_1280x1024.jpg"</span><span>) </span></span></li><li class="alt"><span> .size(<span class="number">1280</span><span>,</span><span class="number">1024</span><span>) </span></span></li><li><span> .rotate(<span class="number">90</span><span>) </span></span></li><li class="alt"><span> .toFile(<span class="string">"c:/a380_rotate+90.jpg"</span><span>); </span></span></li><li><span> </span></li><li class="alt"><span>Thumbnails.of(<span class="string">"images/a380_1280x1024.jpg"</span><span>) </span></span></li><li><span> .size(<span class="number">1280</span><span>,</span><span class="number">1024</span><span>) </span></span></li><li class="alt"><span> .rotate(-<span class="number">90</span><span>) </span></span></li><li><span> .toFile(<span class="string">"c:/a380_rotate-90.jpg"</span><span>); </span></span></li></ol>
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<p><br>
</p>
<p style="text-indent:2em">5、水印</p>
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view plain</a><a target="_blank" href="http://blog.csdn.net/wangpeng047/article/details/17610451#" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" class="CopyToClipboard" title="copy">copy</a><a target="_blank" href="https://code.csdn.net/snippets/130986" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" title="在CODE上檢視代碼片" style="text-indent:0"><img src="https://code.csdn.net/assets/CODE_ico.png" alt="在CODE上檢視代碼片" height="12" width="12" style="position:relative; top:1px; left:2px"></a><a target="_blank" href="https://code.csdn.net/snippets/130986/fork" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" title="派生到我的代碼片" style="text-indent:0"><img src="https://code.csdn.net/assets/ico_fork.svg" alt="派生到我的代碼片" height="12" width="12" style="position:relative; top:2px; left:2px"></a><div style="position: absolute; left: 834px; top: 4099px; width: 18px; height: 18px; z-index: 99;"><embed id="ZeroClipboardMovie_5" src="http://static.blog.csdn.net/scripts/ZeroClipboard/ZeroClipboard.swf" loop="false" menu="false" quality="best" bgcolor="#ffffff" width="18" height="18" name="ZeroClipboardMovie_5" align="middle" allowscriptaccess="always" allowfullscreen="false" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" flashvars="id=5&width=18&height=18" wmode="transparent"></div></div>
</div>
<ol class="dp-j" start="1">
<li class="alt"><span><span class="comment">//watermark(位置，水印圖，透明度)</span><span> </span></span></li><li><span>Thumbnails.of(<span class="string">"images/a380_1280x1024.jpg"</span><span>) </span></span></li><li class="alt"><span> .size(<span class="number">1280</span><span>,</span><span class="number">1024</span><span>) </span></span></li><li><span> .watermark(Positions.BOTTOM_RIGHT,ImageIO.read(newFile(<span class="string">"images/watermark.png"</span><span>)),</span><span class="number">0</span><span>.5f) </span></span></li><li class="alt"><span> .outputQuality(<span class="number">0</span><span>.8f) </span></span></li><li><span> .toFile(<span class="string">"c:/a380_watermark_bottom_right.jpg"</span><span>); </span></span></li><li class="alt"><span> </span></li><li><span>Thumbnails.of(<span class="string">"images/a380_1280x1024.jpg"</span><span>) </span></span></li><li class="alt"><span> .size(<span class="number">1280</span><span>,</span><span class="number">1024</span><span>) </span></span></li><li><span> .watermark(Positions.CENTER,ImageIO.read(newFile(<span class="string">"images/watermark.png"</span><span>)),</span><span class="number">0</span><span>.5f) </span></span></li><li class="alt"><span> .outputQuality(<span class="number">0</span><span>.8f) </span></span></li><li><span> .toFile(<span class="string">"c:/a380_watermark_center.jpg"</span><span>); </span></span></li></ol>
<div class="save_code tracking-ad" data-mod="popu_249"><a href="javascript:;" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" ><img src="http://static.blog.csdn.net/images/save_snippets.png"></a></div></div>
<p><br>
<img alt="" src="https://img-blog.csdn.net/20131227173438828?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvd2FuZ3BlbmcwNDc=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center"></p>
<p><br>
</p>
<p><img alt="" src="https://img-blog.csdn.net/20131227173619562?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvd2FuZ3BlbmcwNDc=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center"></p>
<p><br>
</p>
<p style="text-indent:2em">6、裁剪</p>
<div class="dp-highlighter bg_java">
<div class="bar">
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</div>
<ol class="dp-j" start="1">
<li class="alt"><span><span class="comment">//sourceRegion()</span><span> </span></span></li><li><span> </span></li><li class="alt"><span><span class="comment">//圖檔中心400*400的區域</span><span> </span></span></li><li><span>Thumbnails.of(<span class="string">"images/a380_1280x1024.jpg"</span><span>) </span></span></li><li class="alt"><span> .sourceRegion(Positions.CENTER,<span class="number">400</span><span>,</span><span class="number">400</span><span>) </span></span></li><li><span> .size(<span class="number">200</span><span>,</span><span class="number">200</span><span>) </span></span></li><li class="alt"><span> .keepAspectRatio(<span class="keyword">false</span><span>) </span></span></li><li><span> .toFile(<span class="string">"c:/a380_region_center.jpg"</span><span>); </span></span></li><li class="alt"><span> </span></li><li><span><span class="comment">//圖檔右下400*400的區域</span><span> </span></span></li><li class="alt"><span>Thumbnails.of(<span class="string">"images/a380_1280x1024.jpg"</span><span>) </span></span></li><li><span> .sourceRegion(Positions.BOTTOM_RIGHT,<span class="number">400</span><span>,</span><span class="number">400</span><span>) </span></span></li><li class="alt"><span> .size(<span class="number">200</span><span>,</span><span class="number">200</span><span>) </span></span></li><li><span> .keepAspectRatio(<span class="keyword">false</span><span>) </span></span></li><li class="alt"><span> .toFile(<span class="string">"c:/a380_region_bootom_right.jpg"</span><span>); </span></span></li><li><span> </span></li><li class="alt"><span><span class="comment">//指定坐标</span><span> </span></span></li><li><span>Thumbnails.of(<span class="string">"images/a380_1280x1024.jpg"</span><span>) </span></span></li><li class="alt"><span> .sourceRegion(<span class="number">600</span><span>,</span><span class="number">500</span><span>,</span><span class="number">400</span><span>,</span><span class="number">400</span><span>) </span></span></li><li><span> .size(<span class="number">200</span><span>,</span><span class="number">200</span><span>) </span></span></li><li class="alt"><span> .keepAspectRatio(<span class="keyword">false</span><span>) </span></span></li><li><span> .toFile(<span class="string">"c:/a380_region_coord.jpg"</span><span>); </span></span></li></ol>
<div class="save_code tracking-ad" data-mod="popu_249"><a href="javascript:;" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" ><img src="http://static.blog.csdn.net/images/save_snippets.png"></a></div></div>
<p><br>
</p>
<p><img alt="" src="https://img-blog.csdn.net/20131227173924828?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvd2FuZ3BlbmcwNDc=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center"></p>
<p><img alt="" src="https://img-blog.csdn.net/20131227173901671?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvd2FuZ3BlbmcwNDc=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center"></p>
<p><img alt="" src="https://img-blog.csdn.net/20131227173941015?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvd2FuZ3BlbmcwNDc=/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center"></p>
<p><br>
</p>
<p style="text-indent:2em">7、轉化圖像格式</p>
<div class="dp-highlighter bg_java">
<div class="bar">
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view plain</a><a target="_blank" href="http://blog.csdn.net/wangpeng047/article/details/17610451#" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" class="CopyToClipboard" title="copy">copy</a><a target="_blank" href="https://code.csdn.net/snippets/130986" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" title="在CODE上檢視代碼片" style="text-indent:0"><img src="https://code.csdn.net/assets/CODE_ico.png" alt="在CODE上檢視代碼片" height="12" width="12" style="position:relative; top:1px; left:2px"></a><a target="_blank" href="https://code.csdn.net/snippets/130986/fork" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" title="派生到我的代碼片" style="text-indent:0"><img src="https://code.csdn.net/assets/ico_fork.svg" alt="派生到我的代碼片" height="12" width="12" style="position:relative; top:2px; left:2px"></a><div style="position: absolute; left: 834px; top: 6515px; width: 18px; height: 18px; z-index: 99;"><embed id="ZeroClipboardMovie_7" src="http://static.blog.csdn.net/scripts/ZeroClipboard/ZeroClipboard.swf" loop="false" menu="false" quality="best" bgcolor="#ffffff" width="18" height="18" name="ZeroClipboardMovie_7" align="middle" allowscriptaccess="always" allowfullscreen="false" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" flashvars="id=7&width=18&height=18" wmode="transparent"></div></div>
</div>
<ol class="dp-j" start="1">
<li class="alt"><span><span class="comment">//outputFormat(圖像格式)</span><span> </span></span></li><li><span>Thumbnails.of(<span class="string">"images/a380_1280x1024.jpg"</span><span>) </span></span></li><li class="alt"><span> .size(<span class="number">1280</span><span>,</span><span class="number">1024</span><span>) </span></span></li><li><span> .outputFormat(<span class="string">"png"</span><span>) </span></span></li><li class="alt"><span> .toFile(<span class="string">"c:/a380_1280x1024.png"</span><span>); </span></span></li><li><span> </span></li><li class="alt"><span>Thumbnails.of(<span class="string">"images/a380_1280x1024.jpg"</span><span>) </span></span></li><li><span> .size(<span class="number">1280</span><span>,</span><span class="number">1024</span><span>) </span></span></li><li class="alt"><span> .outputFormat(<span class="string">"gif"</span><span>) </span></span></li><li><span> .toFile(<span class="string">"c:/a380_1280x1024.gif"</span><span>); </span></span></li></ol>
<div class="save_code tracking-ad" data-mod="popu_249"><a href="javascript:;" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" ><img src="http://static.blog.csdn.net/images/save_snippets.png"></a></div></div>
<p style="text-indent:2em"> </p>
<p style="text-indent:2em">8、輸出到OutputStream</p>
<div class="dp-highlighter bg_java">
<div class="bar">
<div class="tools"><strong>[java]</strong> <a target="_blank" href="http://blog.csdn.net/wangpeng047/article/details/17610451#" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" class="ViewSource" title="view plain">
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</div>
<ol class="dp-j" start="1">
<li class="alt"><span><span class="comment">//toOutputStream(流對象)</span><span> </span></span></li><li><span>OutputStreamos=newFileOutputStream(<span class="string">"c:/a380_1280x1024_OutputStream.png"</span><span>); </span></span></li><li class="alt"><span>Thumbnails.of(<span class="string">"images/a380_1280x1024.jpg"</span><span>) </span></span></li><li><span> .size(<span class="number">1280</span><span>,</span><span class="number">1024</span><span>) </span></span></li><li class="alt"><span> .toOutputStream(os); </span></li></ol>
<div class="save_code tracking-ad" data-mod="popu_249"><a href="javascript:;" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" target="_blank" rel="external nofollow" ><img src="http://static.blog.csdn.net/images/save_snippets.png"></a></div></div>
<p style="text-indent:2em"> </p>
<p style="text-indent:2em"> 9、輸出到BufferedImage</p>
<div class="dp-highlighter bg_java">
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<li class="alt"><span><span class="comment">//asBufferedImage()傳回BufferedImage</span><span> </span></span></li><li><span>BufferedImagethumbnail=Thumbnails.of(<span class="string">"images/a380_1280x1024.jpg"</span><span>) </span></span></li><li class="alt"><span> .size(<span class="number">1280</span><span>,</span><span class="number">1024</span><span>) </span></span></li><li><span> .asBufferedImage(); </span></li><li class="alt"><span>ImageIO.write(thumbnail,<span class="string">"jpg"</span><span>,newFile(</span><span class="string">"c:/a380_1280x1024_BufferedImage.jpg"</span><span>)); </span></span></li></ol>
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