图片压缩处理
package com.img;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.imageio.ImageIO;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
/**
*
* @author
*/
public class CompressPicDemo {
private File file = null; // 文件对象
private String inputDir; // 输入图路径
private String outputDir; // 输出图路径
private String inputFileName; // 输入图文件名
private String outputFileName; // 输出图文件名
private int outputWidth = 100; // 默认输出图片宽
private int outputHeight = 100; // 默认输出图片高
private boolean proportion = true; // 是否等比缩放标记(默认为等比缩放)
public CompressPicDemo() { // 初始化变量
inputDir = "";
outputDir = "";
inputFileName = "";
outputFileName = "";
outputWidth = 100;
outputHeight = 100;
}
public void setInputDir(String inputDir) {
this.inputDir = inputDir;
}
public void setOutputDir(String outputDir) {
this.outputDir = outputDir;
}
public void setInputFileName(String inputFileName) {
this.inputFileName = inputFileName;
}
public void setOutputFileName(String outputFileName) {
this.outputFileName = outputFileName;
}
public void setOutputWidth(int outputWidth) {
this.outputWidth = outputWidth;
}
public void setOutputHeight(int outputHeight) {
this.outputHeight = outputHeight;
}
public void setWidthAndHeight(int width, int height) {
this.outputWidth = width;
this.outputHeight = height;
}
/*
* 获得图片大小
* 传入参数 String path ：图片路径
*/
public long getPicSize(String path) {
file = new File(path);
return file.length();
}
// 图片处理
public String compressPic() {
try {
//获得源文件
file = new File(inputDir + inputFileName);
if (!file.exists()) {
return "";
}
Image img = ImageIO.read(file);
// 判断图片格式是否正确
if (img.getWidth(null) == -1) {
System.out.println(" can't read,retry!" + "<BR>");
return "no";
} else {
int newWidth; int newHeight;
// 判断是否是等比缩放
if (this.proportion == true) {
// 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) outputHeight + 0.1;
// 根据缩放比率大的进行缩放控制
double rate = rate1 > rate2 ? rate1 : rate2;
newWidth = (int) (((double) img.getWidth(null)) / rate);
newHeight = (int) (((double) img.getHeight(null)) / rate);
} else {
newWidth = img.getWidth(null); // 输出的图片宽度
newHeight = img.getHeight(null); // 输出的图片高度
}
BufferedImage tag = new BufferedImage((int) newWidth, (int) newHeight, BufferedImage.TYPE_INT_RGB);
/*
* Image.SCALE_SMOOTH 的缩略算法 生成缩略图片的平滑度的
* 优先级比速度高 生成的图片质量比较好 但速度慢
*/
tag.getGraphics().drawImage(img.getScaledInstance(newWidth, newHeight, Image.SCALE_SMOOTH), 0, 0, null);
FileOutputStream out = new FileOutputStream(outputDir + outputFileName);
// JPEGImageEncoder可适用于其他图片类型的转换
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(tag);
out.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
return "ok";
}
public String compressPic (String inputDir, String outputDir, String inputFileName, String outputFileName) {
// 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;
return compressPic();
}
public String compressPic(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;
// 设置图片长宽
setWidthAndHeight(width, height);
// 是否是等比缩放 标记
this.proportion = gp;
return compressPic();
}
// main测试
// compressPic(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 static void main1(String[] arg) {
CompressPicDemo mypic = new CompressPicDemo();
System.out.println("输入的图片大小：" + mypic.getPicSize("e:\\1.bmp")/1024 + "KB");
mypic.compressPic("e:\\", "e:\\", "1.bmp", "r1.jpg", 120, 120, false);
}
public static void main(String[] arg) {
// System.out.println("输入的图片大小：" + mypic.getPicSize("e:\\1.bmp")/1024 + "KB");
int count = 0; // 记录全部图片压缩所用时间
for (int i = 1; i <= 200; i++) {
ThreadTestImg img = new ThreadTestImg();
img.inimg = i;
img.outimg =i;
img.start();
// CompressPicDemo mypic = new CompressPicDemo();
// int start = (int) System.currentTimeMillis(); // 开始时间
// mypic.compressPic("e:\\text2\\", "e:\\test\\", ""+i+".bmp", "r1"+i+".jpg", 2100, 2900, true);
// int end = (int) System.currentTimeMillis(); // 结束时间
// int re = end-start; // 但图片生成处理时间
// count += re; System.out.println("第" + (i+1) + "张图片压缩处理使用了: " + re + "毫秒");
// System.out.println("输出的图片大小：" + mypic.getPicSize("e:\\test\\r1"+i+".jpg")/1024 + "KB");
}
// System.out.println("总共用了：" + count + "毫秒");
}
public static void main3(String[] args) throws Exception {
File f = new File("E:/text2/1.bmp");
FileInputStream fi = new FileInputStream(f);
byte [] b = new byte[(int) f.length()];
fi.read(b);
for(int i = 1;i<=199;i++){
FileOutputStream fie = new FileOutputStream("E:/text2/"+(i+1)+".bmp");
fie.write(b);
fie.flush();
fie.close();
}
fi.close();
}
}
package com.img;
public class ThreadTestImg extends Thread{
public int inimg ;
public int outimg;
@Override
public void run() {
CompressPicDemo mypic = new CompressPicDemo();
int start = (int) System.currentTimeMillis();
System.out.println("第" + (inimg+1) + "张图片");
mypic.compressPic("e:\\text2\\", "e:\\test\\", ""+inimg+".bmp", "r1"+outimg+".jpg", 2100, 2900, true);
int end = (int) System.currentTimeMillis(); // 结束时间
int re = end-start; // 但图片生成处理时间
System.out.println("第" + (inimg+1) + "张图片压缩处理使用了: " + re + "毫秒");
System.out.println("输出的图片大小：" + mypic.getPicSize("e:\\test\\r1"+inimg+".jpg")/1024 + "KB");
}
}
