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为什么？
因为之前一个项目，安卓那边说只能处理JSON，别的都不行。。。（后来问过他人，明明可以处理其他的~~）
当时因为赶进度，所以直接缓存了图片（囧），然后将图片地址发出去。
过后想了下完全可以转成字符串发送过去。
方法如下：
验证码图片
public BufferedImage getImage() throws IOException{ int width = 60; int height = 32; //create the image BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics g = image.getGraphics(); // set the background color g.setColor(new Color(0xDCDCDC)); g.fillRect(0, 0, width, height); // draw the border g.setColor(Color.black); g.drawRect(0, 0, width - 1, height - 1); // create a random instance to generate the codes Random rdm = new Random(); String hash1 = Integer.toHexString(rdm.nextInt()); // make some confusion for(int i = 0; i < 50; i++){ int x = rdm.nextInt(width); int y = rdm.nextInt(height); g.drawOval(x, y, 0, 0); } // generate a random code String capstr = hash1.substring(0, 4); g.setColor(new Color(0, 100, 0)); g.setFont(new Font("Candara", Font.BOLD, 24)); g.drawString(capstr, 8, 24); g.dispose(); return image; }
JSP中直接输出
ImageIO.write(image, "JPEG", response.getOutputStream());
转成字符串的工具方法
public static byte[] object2byteArray(Object object){ ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); ObjectOutputStream objectOutputStream = null; byte[] bytes = null; try{ objectOutputStream = new ObjectOutputStream(byteArrayOutputStream); objectOutputStream.writeObject(object); bytes = byteArrayOutputStream.toByteArray(); byteArrayOutputStream.close(); objectOutputStream.close(); return bytes; } catch(IOException e){ e.printStackTrace(); } return null; }
测试方法
@Test public void run() throws IOException{ byte[] bytes = object2byteArray(getImage()); String str = Base64.getEncoder().encodeToString(bytes); System.out.println(str); }
但是，行不通！！！因为BufferedImage没有实现序列化接口，囧囧有神~
解决办法
/** * 这个类，纯粹为了实现序列化接口！ */ public class MyBufferedImage extends BufferedImage implements Serializable { public MyBufferedImage(int width, int height, int imageType){ super(width, height, imageType); } public MyBufferedImage(int width, int height, int imageType, IndexColorModel cm){ super(width, height, imageType, cm); } public MyBufferedImage(ColorModel cm, WritableRaster raster, boolean isRasterPremultiplied, Hashtable<?, ?> properties){ super(cm, raster, isRasterPremultiplied, properties); } }
然后
public MyBufferedImage getImage() throws IOException{ int width = 60; int height = 32; //create the image MyBufferedImage image = new MyBufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics g = image.getGraphics(); // set the background color g.setColor(new Color(0xDCDCDC)); g.fillRect(0, 0, width, height); // draw the border g.setColor(Color.black); g.drawRect(0, 0, width - 1, height - 1); // create a random instance to generate the codes Random rdm = new Random(); String hash1 = Integer.toHexString(rdm.nextInt()); // make some confusion for(int i = 0; i < 50; i++){ int x = rdm.nextInt(width); int y = rdm.nextInt(height); g.drawOval(x, y, 0, 0); } // generate a random code String capstr = hash1.substring(0, 4); g.setColor(new Color(0, 100, 0)); g.setFont(new Font("Candara", Font.BOLD, 24)); g.drawString(capstr, 8, 24); g.dispose(); return image; }
现在再执行测试就OK啦。
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原文地址：http://www.cnblogs.com/larryzeal/p/5570665.html
