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

    }

    private void saveImage(BufferedImage bi, String savePath, String fileType) throws IOException {

        FileOutputStream out = new FileOutputStream(savePath);

        ImageIO.write(bi, fileType, out);// 存盘

        out.flush();

        out.close();

    }

  /***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.getHeigh
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t(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;

    }