jpegjava代码 jpeg源码

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java中JPEGImageEncoder的用法

String srcFileName="x:\\dd\\test.jpg";//源图像路径

String destFileName="x:\\dd\\test.jpg";//源图像路径

BufferedImage originalPic = ImageIO.read(new FileInputStream(srcFileName));

int imageWidth = originalPic.getWidth();

int imageHeight = originalPic.getHeight();

//产生新的图像缓冲对象

BufferedImage newBufferedImage = new BufferedImage(imageWidth, imageHeight,

BufferedImage.TYPE_3BYTE_BGR);

//颜色转换（黑白）

ColorConvertOp cco = new ColorConvertOp(ColorSpace

.getInstance(ColorSpace.CS_GRAY), null);

cco.filter(originalPic, newBufferedImage);

FileOutputStream fos = new FileOutputStream(destFileName);

if (destFileName.toLowerCase().endsWith(".gif")) {

ImageIO.write(newBufferedImage, "gif", fos);

}

if (destFileName.toLowerCase().endsWith(".png")) {

ImageIO.write(newBufferedImage, "png", fos);

}

//针对jpeg、jpg设置输出编码

if ((destFileName.toLowerCase().endsWith(".jpg"))

|| (destFileName.toLowerCase().endsWith(".jpeg"))) {

JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(fos);

JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(newBufferedImage);

param.setQuality(1.0F, false);

encoder.encode(newBufferedImage);

}

fos.flush();

fos.close();

重点解释一下：

针对jpeg、jpg设置输出编码

JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(fos);

相关问答

Q1: 用java如何读取Jpeg2000，速求解决方案和代码

import java.util.*;

public class Main7 {

public static void main(String[] args) {

Scanner reader=new Scanner(System.in);

String str=reader.next();//读取为字符串jpegjava代码，如果读取为其jpegjava代码他也可以jpegjava代码，不满意再追问

}

Q2: 用JAVA做一个JPEG图像生成器

运行下试试！·

import java.awt.*;

import java.util.*;

import java.awt.geom.*;

import java.awt.image.*;

import java.awt.event.*;

import java.io.*;

import javax.swing.*;

import com.sun.image.codec.jpeg.*;

class Point

{int x,y;

Point(int x,int y)

{this.x=x;this.y=y;

}

public class MakeJPEG extends Canvas implements MouseMotionListener,MouseListener,ActionListener

{

int x=-1,y=-1,橡皮擦通知=0,清除通知=0;

Vector v=null;int n=1;

Graphics2D ggg ;

BufferedImage image;

Frame window;

Button 保存,调色板,橡皮,清除,画笔,获取屏幕,绘制图形;

Color 画笔颜色;

Panel pCenter,pSouth,pNorth;

public MakeJPEG()

{

保存=new Button("将绘制的图形或屏幕保存为JPG文件");

获取屏幕=new Button("获取屏幕");

绘制图形=new Button("绘制图形");

调色板=new Button("打开调色板");

画笔=new Button("画笔");

橡皮=new Button("橡皮");

清除=new Button("清除");

调色板.addActionListener(this);

绘制图形.addActionListener(this);

保存.addActionListener(this);

画笔.addActionListener(this);

橡皮.addActionListener(this);

清除.addActionListener(this);

获取屏幕.addActionListener(this);

画笔颜色=new Color(0,0,0);

addMouseMotionListener(this);

addMouseListener(this);

v=new Vector();

setBackground(Color.white);

image=new BufferedImage(200,200,BufferedImage.TYPE_INT_RGB);

ggg=image.createGraphics();

Rectangle2D rect=new Rectangle2D.Double(0,0,200,200);

ggg.setColor(getBackground());

ggg.fill(rect);

window=new Frame("JPEG图像生成器");

pCenter=new Panel();

pCenter.setLayout(null);

pCenter.add(this);

pCenter.setBackground(Color.gray);

this.setBounds(80,30,210,210);

window.add(pCenter,BorderLayout.CENTER);

pNorth=new Panel();

pNorth.add(保存);

pNorth.add(绘制图形);

pNorth.add(获取屏幕);

window.add(pNorth,BorderLayout.NORTH);

pSouth=new Panel();

pSouth.add(调色板);

pSouth.add(橡皮);

pSouth.add(清除);

pSouth.add(画笔);

window.add(pSouth,BorderLayout.SOUTH);

window.setVisible(true);

window.addWindowListener(new WindowAdapter()

{

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

});

window.setBounds(100,80,390,380);

window.validate();

}

public void paint(Graphics g)

{

if(x!=-1y!=-1橡皮擦通知==0清除通知==0)

{

g.setColor(画笔颜色);

n=v.size();

for(int i=0;in-1;i++)

{

Point p1=(Point)v.elementAt(i);

Point p2=(Point)v.elementAt(i+1);

g.drawLine(p1.x,p1.y,p2.x,p2.y);

ggg.setColor(g.getColor());

ggg.drawLine(p1.x,p1.y,p2.x,p2.y);

}

else if(橡皮擦通知==1清除通知==0)

{

g.setColor(getBackground());

g.fillRect(x-2,y-2,4,4);

ggg.setColor(getBackground());

ggg.fillRect(x-2,y-2,4,4);

}

else if(清除通知==1橡皮擦通知==0)

{

g.setColor(getBackground());

g.fillRect(0,0,200,200);

ggg.setColor(getBackground());

ggg.fillRect(0,0,200,200);

}

g.drawImage(image,0,0,200,200,this);

}

public void mouseDragged(MouseEvent e)

{

x=(int)e.getX();

y=(int)e.getY();

Point p=new Point(x,y);

v.addElement(p);

repaint();

}

public void mouseMoved(MouseEvent e)

{}

public void mousePressed(MouseEvent e)

{}

public void mouseReleased(MouseEvent e)

{

v.removeAllElements();

}

public void mouseEntered(MouseEvent e){}

public void mouseExited(MouseEvent e){}

public void mouseClicked(MouseEvent e){}

public void update(Graphics g)

{

paint(g);

}

public void actionPerformed(ActionEvent e)

{

if(e.getSource()==橡皮)

{

橡皮擦通知=1;

清除通知=0 ;

}

else if(e.getSource()==清除)

{

清除通知=1;

橡皮擦通知=0;

repaint();

}

else if(e.getSource()==画笔)

{

橡皮擦通知=0;

清除通知=0;

}

else if(e.getSource()==保存)

{

FileDialog savedialog=new FileDialog(window,"保存图型到JPG格式",FileDialog.SAVE);

savedialog.setVisible(true);

if(savedialog.getFile()!=null)

{

try{

String fileName=savedialog.getFile();

FileOutputStream out=new FileOutputStream(fileName);

JPEGImageEncoder encoder=JPEGCodec.createJPEGEncoder(out);

JPEGEncodeParam param=encoder.getDefaultJPEGEncodeParam(image);

param.setQuality(1.0f,false);

encoder.setJPEGEncodeParam(param);

encoder.encode(image);

out.close();

}

catch(Exception EE)

{

}

else if(e.getSource()==获取屏幕)

{

Robot robot=null;

try{

robot=new Robot();

}

catch(Exception er)

{

}

Rectangle screenRect=null;

int width=getToolkit().getScreenSize().width;

int height=getToolkit().getScreenSize().height;

screenRect=new Rectangle(0,0,width,height);

window.setVisible(false);

this.window.setVisible(false);

image=robot.createScreenCapture(screenRect);

window.setVisible(true);

repaint();

}

else if(e.getSource()==调色板)

{

Color tempColor=JColorChooser.showDialog(window,"调色板",画笔颜色);

{

if(tempColor!=null)

{

画笔颜色=tempColor;

画笔.setForeground(画笔颜色);

}

else if(e.getSource()==绘制图形)

{

window.dispose();

this.window.dispose();

MakeJPEG canvas=new MakeJPEG();

}

public static void main(String args[])

{

new MakeJPEG();

}

Q3: 用java实现对视频添加水印的代码或思路

package com.jc.ts.services;

import java.awt.Color;

import java.awt.Graphics;

import java.awt.Image;

import java.awt.image.BufferedImage;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.IOException;

import javax.imageio.ImageIO;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.sun.image.codec.jpeg.ImageFormatException;

import com.sun.image.codec.jpeg.JPEGCodec;

import com.sun.image.codec.jpeg.JPEGImageEncoder;

/**

*添加图片水印的服务类

* */

public class WaterMark {

/**

* @param sizeContext添加水印文字

* @param request 请求流对象

* @param request 响应流对象

* */

@SuppressWarnings("deprecation")

public static void createMarkSize(String sizeContext,HttpServletRequest request,HttpServletResponse response) {

try {

String path=request.getRealPath(request.getServletPath());

FileInputStream in=new FileInputStream(path);

Image src=ImageIO.read(in);

int w=src.getWidth(null);

int h=src.getHeight(null);

BufferedImage img=new BufferedImage(w,h,BufferedImage.TYPE_INT_RGB);//构建画板

Graphics g=img.getGraphics();//得到画笔

g.drawImage(src,0,0,w,h,null);//把源图片写入画板

g.setColor(Color.red);

g.drawString(sizeContext,10,5); // 添加文字

g.dispose();//生成图片

JPEGImageEncoder e=JPEGCodec.createJPEGEncoder(response.getOutputStream());

e.encode(img);

response.getOutputStream().close();

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (ImageFormatException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

/**

* @param localPath 添加水印LOGO路径

* @param request 请求流对象

* @param request 响应流对象

**/

@SuppressWarnings("deprecation")

public static void createMarkLogo(String localPath,HttpServletRequest request,HttpServletResponse response) {

try {

FileInputStream file=new FileInputStream(localPath);

Image fimg=ImageIO.read(file);

int fw=fimg.getWidth(null);

int fh=fimg.getHeight(null);

String path=request.getRealPath(request.getServletPath());

FileInputStream in=new FileInputStream(path);

Image src=ImageIO.read(in);

int w=src.getWidth(null);

int h=src.getHeight(null);

BufferedImage img=new BufferedImage(w,h,BufferedImage.TYPE_INT_RGB);//构建画板

Graphics g=img.getGraphics();//得到画笔

g.drawImage(src,0,0,w,h,null);//把原图片写入画板

g.drawImage(fimg,w-20,h-15,fw,fh,null);//把水印图片写入画板

g.dispose();//生成图片

JPEGImageEncoder e=JPEGCodec.createJPEGEncoder(response.getOutputStream());

e.encode(img);

response.getOutputStream().close();

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (ImageFormatException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

/**

* @param localPath 添加水印图片路径

* @param request 请求流对象

* @param request 响应流对象

* @param width 水印图片的宽度

* @param height 水印图片的长度

**/

@SuppressWarnings("deprecation")

public static void createMarkLogo(String localPath,HttpServletRequest request,HttpServletResponse response,int width,int height) {

try {

FileInputStream file=new FileInputStream(localPath);

Image fimg=ImageIO.read(file);

int fw=fimg.getWidth(null);

int fh=fimg.getHeight(null);

String path=request.getRealPath(request.getServletPath());

FileInputStream in=new FileInputStream(path);

Image src=ImageIO.read(in);

int w=src.getWidth(null);//w为你过滤图片的宽度

int h=src.getHeight(null);//h为你过滤图片的长度

BufferedImage img=new BufferedImage(w+width,h+height,BufferedImage.TYPE_INT_RGB);//构建画板(画板的宽度为两个图片之和)

Graphics g=img.getGraphics();//得到画笔

g.drawImage(src,0,0,w,h,null);//把原图片写入画板

g.drawImage(fimg,width,height,fw,fh,null);//把水印图片写入画板

g.dispose();//生成图片

JPEGImageEncoder e=JPEGCodec.createJPEGEncoder(response.getOutputStream());

e.encode(img);

response.getOutputStream().close();

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (ImageFormatException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

注意第三个方法的注释地方g.drawImage(fimg,width,height,fw,fh,null);根据参数你在调调(放原图下面的)

过滤器调用

package com.jc.ts.filter;

import java.io.IOException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import com.jc.ts.services.WaterMark;

public class WaterFilter implements Filter {

public void destroy() {

// TODO Auto-generated method stub

}

public void doFilter(ServletRequest arg0, ServletResponse arg1,

FilterChain arg2) throws IOException, ServletException {

HttpServletRequest request=(HttpServletRequest)arg0;

HttpServletResponse response=(HttpServletResponse)arg1;

//WaterMark.createMarkSize("南京ts", request, response);

//WaterMark.createMarkLogo("D:\\workspace\\mybook\\WebRoot\\images\\logo\\book.jpg", request, response);

WaterMark.createMarkLogo("D:\\workspace\\mybook\\WebRoot\\images\\logo\\book.jpg", request, response,20,30);

//注意路径为绝对路径且三个效果不能同时执行

}

public void init(FilterConfig arg0) throws ServletException {

// TODO Auto-generated method stub

}

web.xml配置(写在servlet上面)

filter

descriptionThis is the description of my J2EE component/description

display-nameThis is the display name of my J2EE component/display-name

filter-nameWaterFilter/filter-name

filter-classcom.jc.ts.filter.WaterFilter/filter-class

/filter

Q4: 求一个用BufferedImage这个改变图片大小的JAVA代码！~！

import java.awt.Image;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import javax.imageio.ImageIO;

import com.sun.image.codec.jpeg.JPEGCodec;

import com.sun.image.codec.jpeg.JPEGEncodeParam;

import com.sun.image.codec.jpeg.JPEGImageEncoder;

public class ImageZipUtil {

/**

* 压缩图片文件br

* 先保存原文件jpegjava代码，再压缩、上传

* @param oldFile

* 要进行压缩jpegjava代码的文件全路径

* @param width

* 宽度

* @param height

* 高度

* @param quality

* 质量

* @param smallIcon

* 小图片jpegjava代码的后缀

* @return 返回压缩后jpegjava代码的文件jpegjava代码的全路径

public String zipImageFile(String oldFile, int width, int height,

float quality, String smallIcon) {

if (oldFile == null) {

return null;

}

String newImage = null;

try {

/** 对服务器上的临时文件进行处理 */

Image srcFile = ImageIO.read(new File(oldFile));

int w = srcFile.getWidth(null);

System.out.println(w);

System.out.println(smallIcon);

int h = srcFile.getHeight(null);

System.out.println(h);

//width = w/4;

//height = h/4;

/** 宽,高设定 */

BufferedImage tag = new BufferedImage(width, height,

BufferedImage.TYPE_INT_RGB);

tag.getGraphics().drawImage(srcFile, 0, 0, width, height, null);

String filePrex = oldFile.substring(0, oldFile.indexOf('.'));

/** 压缩后的文件名 */

newImage = filePrex + smallIcon

+ oldFile.substring(filePrex.length());

/** 压缩之后临时存放位置 */

FileOutputStream out = new FileOutputStream(newImage);

JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);

JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(tag);

/** 压缩质量 */

jep.setQuality(quality, true);

encoder.encode(tag, jep);

out.close();

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

return newImage;

}

/**

* 保存文件到服务器临时路径

* @param fileName

* @param is

* @return 文件全路径

public String writeFile(String fileName, InputStream is) {

if (fileName == null || fileName.trim().length() == 0) {

return null;

}

try {

/** 首先保存到临时文件 */

FileOutputStream fos = new FileOutputStream(fileName);

byte[] readBytes = new byte[512];// 缓冲大小

int readed = 0;

while ((readed = is.read(readBytes)) 0) {

fos.write(readBytes, 0, readed);

}

fos.close();

is.close();

} catch (FileNotFoundException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

return fileName;

}

public static void main(String[] args){

ImageZipUtil u = new ImageZipUtil();

u.zipImageFile("e:/SAM_0006.JPG", 128, 128, 1f, "x2");

}

Q5: 为什么绘制jpeg图的jsp代码，在tomcat行，jrun不行

报错：IllegalStateException %@ page autoFlush="false" import="java.awt.*,java.io.*,java.awt.image.*,com.sun.image.codec.jpeg.*,java.util.*"% % String ImageStr = ""; //request.getParameter("ID_Text"); out.clear(); response.setContentType("image/jpeg"); response.addHeader("pragma","NO-cache"); response.addHeader("Cache-Control","no-cache"); response.addDateHeader("Expries",0); int width=400, height=300; BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics g = image.getGraphics(); g.drawString(ImageStr,30,30); g.dispose(); OutputStream outStream = response.getOutputStream(); JPEGImageEncoder encoder =JPEGCodec.createJPEGEncoder(outStream); encoder.encode(image); outStream.close(); %

同事解答。把%@ page autoFlush="false" import="java.awt.*,java.io.*,java.awt.image.*,com.sun.image.codec.jpeg.*,java.util.*"%% String 就行。

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