Thumbnailator java图片压缩，加水印，批量生成缩略图

地址：http://code.google.com/p/thumbnailator/

1、指定大小进行缩放

    //size(宽度, 高度)  


<span style="color: #008000;">/*</span><span style="color: #008000;">   </br>
 * 若图片横比200小，高比300小，不变   </br>
 * 若图片横比200小，高比300大，高缩小到300，图片比例不变   </br>
 * 若图片横比200大，高比300小，横缩小到200，图片比例不变   </br>
 * 若图片横比200大，高比300大，图片按比例缩小，横为200或高为300   </br>
 </span><span style="color: #008000;">*/</span><span style="color: #000000;">   </br>
Thumbnails.of(</span>"images/a380_1280x1024.jpg"<span style="color: #000000;">)   </br>
        .size(</span>200, 300<span style="color: #000000;">)  </br>
        .toFile(</span>"c:/a380_200x300.jpg"<span style="color: #000000;">);  </br></br>
  
Thumbnails.of(</span>"images/a380_1280x1024.jpg"<span style="color: #000000;">)   </br>
        .size(</span>2560, 2048<span style="color: #000000;">)   </br>
        .toFile(</span>"c:/a380_2560x2048.jpg");  </pre>

2、按照比例进行缩放

Java代码  收藏代码
</span><span style="color: #008000;">//</span><span style="color: #008000;">scale(比例)  </span></br>
Thumbnails.of("images/a380_1280x1024.jpg"<span style="color: #000000;">)   </br>
        .scale(</span>0.25f<span style="color: #000000;">)  </br>
        .toFile(</span>"c:/a380_25%.jpg"<span style="color: #000000;">);  </br>
  
Thumbnails.of(</span>"images/a380_1280x1024.jpg"<span style="color: #000000;">)   </br>
        .scale(</span>1.10f<span style="color: #000000;">)  </br>
        .toFile(</span>"c:/a380_110%.jpg"); </pre>

3、不按照比例，指定大小进行缩放

//keepAspectRatio(false) 默认是按照比例缩放的  

Thumbnails.of("images/a380_1280x1024.jpg")   

        .size(200, 200)   

        .keepAspectRatio(false)   

        .toFile("c:/a380_200x200.jpg")

4、旋转

//rotate(角度),正数：顺时针 负数：逆时针  

Thumbnails.of("images/a380_1280x1024.jpg")   

        .size(1280, 1024)  

        .rotate(90)   

        .toFile("c:/a380_rotate+90.jpg");   


Thumbnails.of("images/a380_1280x1024.jpg")   


.size(1280, 1024)  


.rotate(-90)   


.toFile("c:/a380_rotate-90.jpg");

5、水印

    //watermark(位置，水印图，透明度)  

    Thumbnails.of("images/a380_1280x1024.jpg")   

            .size(1280, 1024)  

            .watermark(Positions.BOTTOM_RIGHT, ImageIO.read(new File("images/watermark.png")), 0.5f)   

            .outputQuality(0.8f)   

            .toFile("c:/a380_watermark_bottom_right.jpg");  


Thumbnails.of(</span>"images/a380_1280x1024.jpg"<span style="color: #000000;">)   </br>
        .size(</span>1280, 1024<span style="color: #000000;">)  </br>
        .watermark(Positions.CENTER, ImageIO.read(</span><span style="color: #0000ff;">new</span> File("images/watermark.png")), 0.5f<span style="color: #000000;">)   </br>
        .outputQuality(</span>0.8f<span style="color: #000000;">)   </br>
        .toFile(</span>"c:/a380_watermark_center.jpg");  </pre>

6、裁剪

    //sourceRegion()  


</span><span style="color: #008000;">//</span><span style="color: #008000;">图片中心400*400的区域  </span></br>
Thumbnails.of("images/a380_1280x1024.jpg"<span style="color: #000000;">)  </br>
        .sourceRegion(Positions.CENTER, </span>400,400<span style="color: #000000;">)  </br>
        .size(</span>200, 200<span style="color: #000000;">)  </br>
        .keepAspectRatio(</span><span style="color: #0000ff;">false</span><span style="color: #000000;">)   </br>
        .toFile(</span>"c:/a380_region_center.jpg"<span style="color: #000000;">);  </br></br>
  
</span><span style="color: #008000;">//</span><span style="color: #008000;">图片右下400*400的区域  </span></br>
Thumbnails.of("images/a380_1280x1024.jpg"<span style="color: #000000;">)  </br>
        .sourceRegion(Positions.BOTTOM_RIGHT, </span>400,400<span style="color: #000000;">)  </br>
        .size(</span>200, 200<span style="color: #000000;">)  </br>
        .keepAspectRatio(</span><span style="color: #0000ff;">false</span><span style="color: #000000;">)   </br>
        .toFile(</span>"c:/a380_region_bootom_right.jpg"<span style="color: #000000;">);  </br></br>
  
</span><span style="color: #008000;">//</span><span style="color: #008000;">指定坐标  </span></br>
Thumbnails.of("images/a380_1280x1024.jpg"<span style="color: #000000;">)  </br>
        .sourceRegion(</span>600, 500, 400, 400<span style="color: #000000;">)  </br>
        .size(</span>200, 200<span style="color: #000000;">)  </br>
        .keepAspectRatio(</span><span style="color: #0000ff;">false</span><span style="color: #000000;">)   </br>
        .toFile(</span>"c:/a380_region_coord.jpg");  </pre>

7、转化图像格式

//outputFormat(图像格式)  

Thumbnails.of("images/a380_1280x1024.jpg")   

        .size(1280, 1024)  

        .outputFormat("png")   

        .toFile("c:/a380_1280x1024.png");   


Thumbnails.of("images/a380_1280x1024.jpg")   


.size(1280, 1024)  


.outputFormat("gif")   


.toFile("c:/a380_1280x1024.gif"); 

8、输出到OutputStream

    //toOutputStream(流对象)    

    OutputStream os = new FileOutputStream("c:/a380_1280x1024_OutputStream.png");    

    Thumbnails.of("images/a380_1280x1024.jpg")     

            .size(1280, 1024)    

            .toOutputStream(os);  

9、输出到BufferedImage

//asBufferedImage() 返回BufferedImage  

BufferedImage thumbnail = Thumbnails.of("images/a380_1280x1024.jpg")   

        .size(1280, 1024)  

        .asBufferedImage();  

ImageIO.write(thumbnail, "jpg", new File("c:/a380_1280x1024_BufferedImage.jpg"));