imageoperate.java

用于图片处理

/*
 *  向指定的图片上写字，生成图片缩略图等。
 *  Made In GamVan
 */
package com.gamvan.image;
import com.gamvan.tools.Arith;
import java.awt.*;
import java.awt.image.*;
import javax.imageio.ImageIO.*;
import java.io.*;
import com.sun.image.codec.jpeg.JPEGCodec;  
import com.sun.image.codec.jpeg.JPEGImageEncoder;  
// 缩略图
public class ImageOperate { 
    Image img1;
    String message = "";
    String filePath = ""; //程序本身所在的根目录， 绝对路径。
    String waterImg1 = "", waterImg2=""; //水印图片文件名
    String waterPath = ""; //水印图片所在路径，绝对路径
    String str = new String("club.GamVan.com");
    public void waterImage(String oldFile, String newFile){
        /* oldFile加水印前的文件名.
         * newFile加水印后的文件名。
         */
        filePath = filePath.replace("\\","\\\\");
        filePath += "\\\\";
         try{
            File myFile = new File(filePath + oldFile); //指定文件名含路径
            Image src = javax.imageio.ImageIO.read(myFile); //构造Image对象 
            int w=src.getWidth(null); //得到源图宽  
            int h=src.getHeight(null); //得到源图长
            Graphics gim = src.getGraphics();
            BufferedImage tag = new BufferedImage(w,h,BufferedImage.TYPE_INT_RGB);  
            tag.getGraphics().drawImage(src,0,0,w,h,null);
            if(!waterImg1.equals("") && waterImg2.equals("")){
                Image img1 = javax.imageio.ImageIO.read(new File(waterPath+waterImg1));//构造Image对象 
                int w1 = img1.getWidth(null); //得到源图宽  
                int h1 = img1.getHeight(null); //得到源图长
                tag.getGraphics().drawImage(img1,w-w1-12,h-30,w1,h1,null);
            }
            if(!waterImg1.equals("") && !waterImg2.equals("")){
                Image img1 = javax.imageio.ImageIO.read(new File(waterPath+waterImg1));//构造Image对象 
                int w1 = img1.getWidth(null); //得到源图宽  
                int h1 = img1.getHeight(null); //得到源图长
                Image img2 = javax.imageio.ImageIO.read(new File(waterPath+waterImg2));//构造Image对象 
                    int w2 = img2.getWidth(null); //得到源图宽  
                    int h2 = img2.getHeight(null); //得到源图长       
                    tag.getGraphics().drawImage(img2,w-w2-12,h-30,w2,h2,null);
                    tag.getGraphics().drawImage(img1,w-w1-w2-15,h-32,w1,h1,null);
            }
            FileOutputStream out=new FileOutputStream(filePath + newFile); //输出到文件流  
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);   
            encoder.encode(tag); //JPEG编码 
            gim.dispose();
            out.close();      
         }catch(Exception e){
             message = waterPath + e.toString() + filePath;
         }    
    }
    public void writeImage(String oldFile, String newFile){
        filePath = filePath.replace("\\","\\\\");
        filePath += "\\\\";
        //设置字体
        try{
            File myFile = new File(filePath + oldFile); //指定文件名含路径
            Image src = javax.imageio.ImageIO.read(myFile); //构造Image对象 
            int w=src.getWidth(null); //得到源图宽  
            int h=src.getHeight(null); //得到源图长
            //在你创立的image上写字
            Graphics gim = src.getGraphics();
            Font font = new Font("Tahoma", Font.BOLD, 14);
            gim.setFont(font);            
            gim.setColor(Color.black);
            gim.drawString(str, w-(str.length()*10-8), h-19);
            gim.setColor(Color.lightGray);
            gim.drawString(str, w-(str.length()*10-7), h-20);
            BufferedImage tag = new BufferedImage(w,h,BufferedImage.TYPE_INT_RGB);  
            tag.getGraphics().drawImage(src,0,0,w,h,null);
            FileOutputStream out=new FileOutputStream(filePath + newFile); //输出到文件流  
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);   
            encoder.encode(tag); //JPEG编码 
            gim.dispose();
            out.close();  
        }catch(Exception e){
            message = e.toString();
        }
    } 
    public void shrinkImage(int w, int h, String oldFile, String newFile) throws Exception {
        // 参数w表示缩小后的宽度 h缩小后的高度，任何一个为0 则按另一方比例缩小。
        Arith arith = new Arith();
        filePath = filePath.replace("\\","\\\\");
        filePath += "\\\\";
        double wd = 0;
        double hd = 0;
        String ws = "", hs = "";
        try{
            File myFile = new File(filePath + oldFile); //指定文件名含路径
            Image src = javax.imageio.ImageIO.read(myFile); //构造Image对象  
            int wideth=src.getWidth(null); //得到源图宽  
            int height=src.getHeight(null); //得到源图长
            if((w>0 && h==0) && w < wideth){
                // 计算出宽度的缩放比例。
                wd = arith.div(Double.parseDouble(String.valueOf(w)),Double.parseDouble(String.valueOf(wideth)),10);
                hd = arith.mul(wd,Double.parseDouble(String.valueOf(height)));
                hd = arith.round(hd,0); //四舍五入保留小数点0位
                hs = String.valueOf(hd);
                hs = hs.substring(0, hs.indexOf("."));
                h = Integer.parseInt(hs) ; //按比例缩小高度
            }else if((h > 0 && w == 0) && h < height){
                // 计算出高度的缩放比例。
                hd = arith.div(Double.parseDouble(String.valueOf(h)),Double.parseDouble(String.valueOf(height)),10);
                wd = arith.mul(hd,Double.parseDouble(String.valueOf(wideth)));
                wd = arith.round(wd,0); //四舍五入保留小数点0位
                ws = String.valueOf(wd);
                ws = ws.substring(0, ws.indexOf("."));
                w = Integer.parseInt(ws) ; //按比例缩小高度
            }else{
                w = wideth;
                h = height;
            }
            java.awt.image.BufferedImage tag = new BufferedImage(w,h,BufferedImage.TYPE_INT_RGB);  
            tag.getGraphics().drawImage(src,0,0,w,h,null); //绘制缩小后的图  
            FileOutputStream out=new FileOutputStream(filePath + newFile); //输出到文件流  
            JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);   
            encoder.encode(tag); //JPEG编码 
            out.close();  
        }catch(Exception e){
            message = e.toString();
        }
    }
    public String getMessage(){
        return this.message;
    }
    public void setFilePath(String filePath){
        if(filePath!=null){
            this.filePath = filePath;
        }else{
            this.filePath = "";
        }
    }
    public void setStr(String str){
        if(str!=null){
            this.str = str;
        }else{
            this.str = "club.GamVan.com";
        }
    }
    public void setWaterImg1(String str){
        if(str!=null){
            this.waterImg1 = str;
        }else{
            this.waterImg1 = "";
        }
    }
    public void setWaterImg2(String str){
        if(str!=null){
            this.waterImg2 = str;
        }else{
            this.waterImg2 = "";
        }
    }  
    public void setWaterPath(String str){
        if(str!=null){
            this.waterPath = str;
        }else{
            this.waterPath = "";
        }
    } 
}