java按比例壓縮圖片的原始碼,用java如何把圖片處理到指定大小
阿新 • • 發佈：2019-02-09
public static void uploadImage(File p_in,File p_out,int height,int width,String ftype) throws FileNotFoundException,IOException
{
// 取得圖片處理
// ConvertImageFactory l_factory = ConvertImageFactory.getInstance();
// AbstractProduct l_product = l_factory.createAbstractProduct(p_SourceFile.getContentType());
// boolean l_result = l_product.convertImageSize(p_SourceFile
// .getInputStream(), p_path );
InputStream l_in = new FileInputStream(p_in);
OutputStream l_out = new FileOutputStream(p_out);
chgPic(l_in,l_out,width,height,ftype);
}
//按比例壓縮圖片
public static boolean chgPic(InputStream in, OutputStream out,int newWidth, int newHeight,String ftype) {
BufferedImage img = null;
FileInputStream newin=null;
File tempfile=null;
try {
if(ftype.compareToIgnoreCase("bmp")==0){
PNGDecodeParam decodeParam = new PNGDecodeParam();
String l_tempfile = Tool.createNewFileName("jpg");
tempfile = new File(l_tempfile);
JPEGEncodeParam encodeParam = new JPEGEncodeParam();
//根據路徑開啟輸出流
FileOutputStream tempout;
tempout = new FileOutputStream(tempfile);
ImageDecoder decoder = ImageCodec.createImageDecoder("BMP",in,decodeParam);
RenderedImage image = decoder.decodeAsRenderedImage();
ImageEncoder encoder = ImageCodec.createImageEncoder("JPEG",tempout,encodeParam);
encoder.encode(image);
tempout.close();
newin = new FileInputStream(tempfile);
img = ImageIO.read(newin);
}else{
img = ImageIO.read(in);
}
int width = img.getWidth(null);
int height = img.getHeight(null);
if (newWidth >= width) {
if (newHeight < height) {
width = (int) (width * newHeight / height);
height = newHeight;
}
} else {
if (newHeight >= height) {
height = (int) (height * newWidth / width);
width = newWidth;
} else {
if (height > width) {
width = (int) (width * newHeight / height);
height = newHeight;
} else {
height = (int) (height * newWidth / width);
width = newWidth;
}
}
}
BufferedImage img2 = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
img2.getGraphics().drawImage(img, 0, 0, width, height, null);
if (ftype.compareToIgnoreCase("jpg") == 0 || ftype.compareToIgnoreCase("jpeg") == 0 ) {
ImageIO.write(img2, "jpg", out);
} else
ImageIO.write(img2, "png", out);
if( ftype.compareToIgnoreCase("bmp") == 0){
ImageIO.write(img2, "jpg", out);
newin.close();
tempfile.delete();
}
return true;
} catch (Exception ex) {
ex.printStackTrace();
return false;
}finally{
try{
in.close();
out.close();
} catch (IOException e) {
}
}
}
{
// 取得圖片處理
// ConvertImageFactory l_factory = ConvertImageFactory.getInstance();
// AbstractProduct l_product = l_factory.createAbstractProduct(p_SourceFile.getContentType());
// boolean l_result = l_product.convertImageSize(p_SourceFile
// .getInputStream(), p_path );
InputStream l_in = new FileInputStream(p_in);
OutputStream l_out = new FileOutputStream(p_out);
chgPic(l_in,l_out,width,height,ftype);
}
//按比例壓縮圖片
public static boolean chgPic(InputStream in, OutputStream out,int newWidth, int newHeight,String ftype) {
BufferedImage img = null;
FileInputStream newin=null;
File tempfile=null;
try {
if(ftype.compareToIgnoreCase("bmp")==0){
PNGDecodeParam decodeParam = new PNGDecodeParam();
String l_tempfile = Tool.createNewFileName("jpg");
tempfile = new File(l_tempfile);
JPEGEncodeParam encodeParam = new JPEGEncodeParam();
//根據路徑開啟輸出流
FileOutputStream tempout;
tempout = new FileOutputStream(tempfile);
ImageDecoder decoder = ImageCodec.createImageDecoder("BMP",in,decodeParam);
RenderedImage image = decoder.decodeAsRenderedImage();
ImageEncoder encoder = ImageCodec.createImageEncoder("JPEG",tempout,encodeParam);
encoder.encode(image);
tempout.close();
newin = new FileInputStream(tempfile);
img = ImageIO.read(newin);
}else{
img = ImageIO.read(in);
}
int width = img.getWidth(null);
int height = img.getHeight(null);
if (newWidth >= width) {
if (newHeight < height) {
width = (int) (width * newHeight / height);
height = newHeight;
}
} else {
if (newHeight >= height) {
height = (int) (height * newWidth / width);
width = newWidth;
} else {
if (height > width) {
width = (int) (width * newHeight / height);
height = newHeight;
} else {
height = (int) (height * newWidth / width);
width = newWidth;
}
}
}
BufferedImage img2 = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
img2.getGraphics().drawImage(img, 0, 0, width, height, null);
if (ftype.compareToIgnoreCase("jpg") == 0 || ftype.compareToIgnoreCase("jpeg") == 0 ) {
ImageIO.write(img2, "jpg", out);
} else
ImageIO.write(img2, "png", out);
if( ftype.compareToIgnoreCase("bmp") == 0){
ImageIO.write(img2, "jpg", out);
newin.close();
tempfile.delete();
}
return true;
} catch (Exception ex) {
ex.printStackTrace();
return false;
}finally{
try{
in.close();
out.close();
} catch (IOException e) {
}
}
}