java生成缩略图

package com.photomg.suolue;


import java.io.*;
import java.security.PublicKey;
import java.util.*;
import com.sun.image.codec.jpeg.*;
import java.awt.image.*;
import java.awt.*;
import java.net.*;
import java.applet.*;
import java.sql.*;

/**
* Created by IntelliJ IDEA.
* User: Rain
* Date: 11-1-18
* Time: 下午4:21
* To change this template use File | Settings | File Templates.
*/
//缩略图类
//本java类能将jpg图片文件，进行等比或非等比的大小转换。
//具体使用方法
//s_pic大图片路径,生成小图片路径,大图片文件名,生成小图片文名,生成小图片宽度,生成小图片高度,是否等比缩放(默认为true))
public class Deal {

    String InputDir;//输入图路径
    String OutputDir;//输出图路径
    String InputFileName;//输入图文件名
    String OutputFileName;//输出图文建平
    int OutputWidth=80;//默认输出图片宽度
    int OutputHeight=80;//默认输出图片高度
    int rate=0;
    boolean proportion=true;//是否进行等比缩放标记（默认为等比缩放）

    public Deal(){

    }
    public void setInputDir(String inputDir) {
        InputDir = inputDir;
    }

    public void setOutputDir(String outputDir) {
        OutputDir = outputDir;
    }

    public void setInputFileName(String inputFileName) {
        InputFileName = inputFileName;
    }

    public void setOutputFileName(String outputFileName) {
        OutputFileName = outputFileName;
    }

    public void setOutputWidth(int outputWidth) {
        OutputWidth = outputWidth;
    }

    public void setOutputHeight(int outputHeight) {
        this.OutputHeight = outputHeight;
    }

    public void setW_H(int width,int height){
        this.OutputHeight=height;
        this.OutputWidth=width;
    }

    public String s_pic(){
        BufferedImage image;
        String NewFileName;
        //建立输出文件对象
    File file=new File(OutputDir+OutputFileName);
        FileOutputStream tempout=null;
        try{
            tempout=new FileOutputStream(file);
        }catch (Exception e){
            System.out.println();e.toString();
        }
        Image img=null;
        Toolkit tk=Toolkit.getDefaultToolkit();
        Applet app=new Applet();
        MediaTracker mt=new MediaTracker(app);
        try{
            img=tk.getImage(InputDir+InputFileName);
            mt.addImage(img,0);
            mt.waitForID(0);
        }catch (Exception e){
            e.printStackTrace();
        }

        if(img.getWidth(null)==-1){
            System.out.println("can't read,retry!"+"<BR>");
            return "no";
        }else{
            int new_w;
            int new_h;
            if(this.proportion==true){//判断是否是等比缩放
                //为等比缩放计算输出的图片宽度及高度
                double rate1=((double)img.getWidth(null))/(double) OutputWidth+0.1;
                double rate2=((double) img.getHeight(null))/(double) OutputWidth+0.1;
                double rate=rate1>rate2?rate1:rate2;
                new_w=(int) (((double) img.getWidth(null))/rate);
                new_h=(int) (((double) img.getHeight(null))/rate);
            }else{
                new_w=OutputWidth;//输出的图片宽度.
                new_h=OutputHeight;//输出的额图片高度.
            }
            BufferedImage buffImg=new BufferedImage(new_w,new_h,BufferedImage.TYPE_INT_RGB);
            Graphics g=buffImg.createGraphics();

            g.setColor(Color.white);
            g.fillRect(0,0,new_w,new_h);

            g.drawImage(img,0,0,new_w,new_h,null);
            g.dispose();

            JPEGImageEncoder encoder=JPEGCodec.createJPEGEncoder(tempout);
            try{
                encoder.encode(buffImg);
                tempout.close();
            }catch(IOException e){
                System.out.println(e.toString());
            }
        }
        return "ok";
    }
    public String s_pic(String InputDir,String OutputDir,String InputFileName,String OutputFileName,int width,int height,boolean gp){
        //输入图路径
        this.InputDir=InputDir;
        //输出图路径
        this.OutputDir=OutputDir;
        //输入图文件名
        this.InputFileName=InputFileName;
        //输出图文件名
        this.OutputFileName=OutputFileName;
        //设置图片长度和宽度
        setW_H(width,height);
        //是否是等比缩放 标记
        this.proportion=gp;
        return s_pic();
    }

    public static void main(String [] a){
        //s_pic(大图片路径，生成小图片路径，大图片文件名，生成小图片文件名，生成小图片宽度，生成小图片高度，是否等比缩放)
        Deal mypic=new Deal();
        System.out.println(
        mypic.s_pic("E:\\c寸\\pic\\","E:\\c寸\\pic\\","a.jpg","b.jpg",120,90,true));
    }
}


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刘总

java生成缩略图