搞了一中午才搞定，在这里和大家分享一下。
以下是代码：[code=java]import java.awt.Image;
import java.awt.image.BufferedImage;
import java.io.File;
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;
/*******************************************************************************
* 缩略图类（通用） 本java类能将jpg、bmp、png、gif图片文件，进行等比或非等比的大小转换。 具体使用方法
* 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 class CompressPic implements Runnable {
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 CompressPic(String inputDir, String outputDir, String inputFileName,
String outputFileName, int width, int height) {
this.inputDir = inputDir;
this.outputDir = outputDir;
this.inputFileName = inputFileName;
this.outputFileName = outputFileName;
this.outputWidth = width;
this.outputHeight = height;
}
public CompressPic(String inputDir, String outputDir, String inputFileName,
String outputFileName, int width, int height, boolean gp) {
this.inputDir = inputDir;
this.outputDir = outputDir;
this.inputFileName = inputFileName;
this.outputFileName = outputFileName;
this.outputWidth = width;
this.outputHeight = height;
this.proportion = gp;
}
public CompressPic() { // 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!" + "
");
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 = outputWidth; // 输出的图片宽度
newHeight = outputHeight; // 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";
}
@Override
public void run() {
// TODO Auto-generated method stub
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 main(String[] arg) { CompressPic mypic = new
* CompressPic(); System.out.println("输入的图片大小：" +
* mypic.getPicSize("e:\\winxp.gif") / 1024 + "KB"); int count = 0; //
* 记录全部图片压缩所用时间 for (int i = 0; i < 100; i++){ int start = (int)
* System.currentTimeMillis(); // 开始时间 mypic.compressPic("e:\\",
* "e:\\test\\", "winxp.gif", "r1" + i + ".gif", 120, 120, 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"); }
*/
}[/code] |
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