用java处理图片（压缩成小尺寸；加文字和logo水印）

功能：压缩图片变成小尺寸***

*参数1：oImage：原图；*

*参数2：maxWidth：小尺寸宽度；*

*参数3：maxHeight：小尺寸长度；*

*参数4：newImageName：小尺寸图片存放的路径和新名字；*

*参数5：fileType：小尺寸图片类型（png,gif,jpg...）

private void compressImage(File oImage, int maxWidth, int maxHeight, String newImageName, String fileType) {

BufferedImage srcImage = ImageIO.read(oImage);;

int srcWidth = srcImage.getWidth(null);
int srcHeight = srcImage.getHeight(null);

if(srcWidth <= maxWidth && srcHeight <= maxHeight){

saveImage(srcImage);

return;

}

Image scaledImage = srcImage.getScaledInstance(srcWidth, srcHeight, Image.SCALE_SMOOTH);

double ratio = Math.min((double) maxWidth / srcWidth, (double) maxHeight / srcHeight);

AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(ratio, ratio), null);

scaledImage = op.filter(srcImage, null);

saveImage((BufferedImage)scaledImage, fileType, new FileOutputStream(newImageName));// 存盘

}

功能：图片加文字水印***
*参数1：oImage：原图；*

*参数2：newImageName：加文字水印图片存放的路径和新名字；*

*参数3：fileType：加文字水印图片类型（png,gif,jpg...）；

*参数4：waterText：文字水印的内容

private boolean pressText(File oImage, String newImageName, String fileType, String waterText) throws IOException{

BufferedImage originalImage = ImageIO.read(oImage);

int originalWidth = originalImage.getWidth(null);

int originalHeight = originalImage.getHeight(null);

if (originalWidth < 50 || originalHeight < 50){

return false;

}

if(waterText==null || waterText.trim().equals("")){

return false;

}

BufferedImage newImage = new BufferedImage(originalWidth, originalHeight, BufferedImage.TYPE_INT_RGB);

Graphics2D g = newImage.createGraphics();

g.drawImage(originalImage, 0, 0, originalWidth, originalHeight, null);

g.setColor(Color.RED);

int fontSize = 13;

g.setFont(new Font("宋体", Font.PLAIN, fontSize));

g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, 0.5f));

int len = InitServlet.WATER_TEXT.length();

if(InitServlet.IS_WATER_CENTER==0){

g.drawString(InitServlet.WATER_TEXT, originalWidth-len*fontSize/2-6,originalHeight-6);

}else{

g.drawString(InitServlet.WATER_TEXT, (originalWidth-(len*fontSize))/2, (originalHeight-fontSize)/2);

}

g.dispose();

ImageIO.write(newImage, fileType, new FileOutputStream(newImageName));// 存盘

return true;

}

功能：图片加logo图片水印***

*参数1：oImage：原图；*

*参数2：newImageName：加logo图片水印存放的路径和新名字；*

*参数3：fileType：加logo图片水印图片类型（png,gif,jpg...）；

*参数4：logoPath：logo水印图片的存放路径

private boolean pressImage(File oImage, String newImageName, String fileType, String logoPath) throws IOException{

File waterMarkImage = new File(logoPath);

if (!waterMarkImage.exists()) {

return false;

}

BufferedImage originalImage = ImageIO.read(oImage);

BufferedImage watermarkImage = ImageIO.read(waterMarkImage);

int originalWidth = originalImage.getWidth(null);

int originalHeight = originalImage.getHeight(null);

int watermarkWidth = watermarkImage.getWidth(null);

int watermarkHeight = watermarkImage.getHeight(null);

if (originalWidth <= watermarkWidth || originalHeight <= watermarkHeight || originalWidth < 50 || originalHeight < 50) {

return false;

}

BufferedImage newImage = new BufferedImage(originalWidth, originalHeight, BufferedImage.TYPE_INT_RGB);

Graphics2D g = newImage.createGraphics();

g.drawImage(originalImage, 0, 0, originalWidth, originalHeight, null);

g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, 0.5f));

if(InitServlet.IS_WATER_CENTER==0){

g.drawImage(watermarkImage, originalWidth-watermarkWidth-10, originalHeight-watermarkHeight-10, watermarkWidth, watermarkHeight, null);

}else{

g.drawImage(watermarkImage, (originalWidth-watermarkWidth)/2, (originalHeight-watermarkHeight)/2, watermarkWidth, watermarkHeight, null);

}

g.dispose();

ImageIO.write(newImage, fileType, new FileOutputStream(newImageName));// 存盘

return true;

}