![r语言脚本前的[1]表示什么](/aiimages/r%E8%AF%AD%E8%A8%80%E8%84%9A%E6%9C%AC%E5%89%8D%E7%9A%84%5B1%5D%E8%A1%A8%E7%A4%BA%E4%BB%80%E4%B9%88.png)
http://sjbbs.zol.com.cn/1/313_9068.html您去下载一个java图片压缩器吧
或者直接在Java下编辑代码来实习转换
package com.sun.util.cyw
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 javax.imageio.ImageIO
import com.sun.image.codec.jpeg.JPEGCodec
import com.sun.image.codec.jpeg.JPEGImageEncoder
/**
* 图片工具类
* 压缩图片大小
* @author Cyw
* @version 1.0
*/
public class ZIPImage {
private File file = null
private String outPutFilePath
private String inPutFilePath
private String inPutFileName
private boolean autoBuildFileName
private String outPutFileName
private int outPutFileWidth = 100// 默认输出图片宽
private int outPutFileHeight = 100// 默认输出图片高
private static boolean isScaleZoom = true// 是否按比例缩放
public ZIPImage() {
outPutFilePath = ""
inPutFilePath = ""
inPutFileName = ""
autoBuildFileName = true
outPutFileName = ""
}
/**
*
* @param ipfp
* @param ipfn
*源文件名
* @param opfp
*目标文件路径
* @param opfn
*目标文件名
*/
public ZIPImage(String ipfp, String ipfn, String opfp, String opfn) {
outPutFilePath = opfp
inPutFilePath = ipfp
inPutFileName = ipfn
autoBuildFileName = true
outPutFileName = opfn
}
/**
*
* @param ipfp
*源文件夹路径
* @param ipfn
*源文件名
* @param opfp
*目标文件路径
* @param opfn
*目标文件名
* @param aBFN
*是否自动生成目标文件名
*/
public ZIPImage(String ipfp, String ipfn, String opfp, String opfn,
boolean aBFN) {
outPutFilePath = opfp
inPutFilePath = ipfp
inPutFileName = ipfn
autoBuildFileName = aBFN
outPutFileName = opfn
}
public boolean isAutoBuildFileName() {
return autoBuildFileName
}
public void setAutoBuildFileName(boolean autoBuildFileName) {
this.autoBuildFileName = autoBuildFileName
}
public String getInPutFilePath() {
return inPutFilePath
}
public void setInPutFilePath(String inPutFilePath) {
this.inPutFilePath = inPutFilePath
}
public String getOutPutFileName() {
return outPutFileName
}
public void setOutPutFileName(String outPutFileName) {
this.outPutFileName = outPutFileName
}
public String getOutPutFilePath() {
return outPutFilePath
}
public void setOutPutFilePath(String outPutFilePath) {
this.outPutFilePath = outPutFilePath
}
public int getOutPutFileHeight() {
return outPutFileHeight
}
public void setOutPutFileHeight(int outPutFileHeight) {
this.outPutFileHeight = outPutFileHeight
}
public int getOutPutFileWidth() {
return outPutFileWidth
}
public void setOutPutFileWidth(int outPutFileWidth) {
this.outPutFileWidth = outPutFileWidth
}
public boolean isScaleZoom() {
return isScaleZoom
}
public void setScaleZoom(boolean isScaleZoom) {
this.isScaleZoom = isScaleZoom
}
public String getInPutFileName() {
return inPutFileName
}
public void setInPutFileName(String inPutFileName) {
this.inPutFileName = inPutFileName
}
/**
* 压缩图片大小
*
* @return boolean
*/
public boolean compressImage() {
boolean flag = false
try {
if (inPutFilePath.trim().equals("")) {
throw new NullPointerException("源文件夹路径不存在。")
}
if (inPutFileName.trim().equals("")) {
throw new NullPointerException("图片文件路径不存在。")
}
if (outPutFilePath.trim().equals("")) {
throw new NullPointerException("目标文件夹路径地址为空。")
} else {
if (!ZIPImage.mddir(outPutFilePath)) {
throw new FileNotFoundException(outPutFilePath
+ " 文件夹创建失败！")
}
}
if (this.autoBuildFileName) { // 自动生成文件名
String tempFile[] = getFileNameAndExtName(inPutFileName)
outPutFileName = tempFile[0] + "_cyw." + tempFile[1]
compressPic()
} else {
if (outPutFileName.trim().equals("")) {
throw new NullPointerException("目标文件名为空。")
}
compressPic()
}
} catch (Exception e) {
flag = false
e.printStackTrace()
return flag
}
return flag
}
// 图片处理
private void compressPic() throws Exception {
try {
// 获得源文件
file = new File(inPutFilePath + inPutFileName)
if (!file.exists()) {
throw new FileNotFoundException(inPutFilePath + inPutFileName
+ " 文件不存在！")
}
Image img = ImageIO.read(file)
// 判断图片格式是否正确
if (img.getWidth(null) == -1) {
throw new Exception("文件不可读！")
} else {
int newWidth
int newHeight
// 判断是否是等比缩放
if (ZIPImage.isScaleZoom == 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) outPutFileWidth + 0.1
double rate2 = ((double) img.getHeight(null))
/ (double) outPutFileHeight + 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 = outPutFileWidth// 输出的图片宽度
newHeight = outPutFileHeight// 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(outPutFilePath
+ outPutFileName)
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out)
encoder.encode(tag)
out.close()
}
} catch (IOException ex) {
ex.printStackTrace()
}
}
/**
* 创建文件夹目录
*
* @param filePath
* @return
* @throws Exception
*/
@SuppressWarnings("unused")
private static boolean mddir(String filePath) throws Exception {
boolean flag = false
File f = new File(filePath)
if (!f.exists()) {
flag = f.mkdirs()
} else {
flag = true
}
return flag
}
/**
* 获得文件名和扩展名
*
* @param fullFileName
* @return
* @throws Exception
*/
private String[] getFileNameAndExtName(String fullFileName)
throws Exception {
String[] fileNames = new String[2]
if (fullFileName.indexOf(".") == -1) {
throw new Exception("源文件名不正确！")
} else {
fileNames[0] = fullFileName.substring(0, fullFileName
.lastIndexOf("."))
fileNames[1] = fullFileName
.substring(fullFileName.lastIndexOf(".") + 1)
}
return fileNames
}
public Image getSourceImage() throws IOException{
//获得源文件
file = new File(inPutFilePath + inPutFileName)
if (!file.exists()) {
throw new FileNotFoundException(inPutFilePath + inPutFileName
+ " 文件不存在！")
}
Image img = ImageIO.read(file)
return img
}
/*
* 获得图片大小
* @path ：图片路径
*/
public long getPicSize(String path) {
File file = new File(path)
return file.length()
}
}
//下面是测试程序
package com.sun.util.cyw
import java.awt.Image
import java.io.IOException
public class ImageTest {
public static void main(String[] args) throws IOException {
ZIPImage zip=new ZIPImage("d:\\","1.jpg","d:\\test\\","处理后的图片.jpg",false)
zip.setOutPutFileWidth(1000)
zip.setOutPutFileHeight(1000)
Image image=zip.getSourceImage()
long size=zip.getPicSize("d:\\1.jpg")
System.out.println("处理前的图片大小 width:"+image.getWidth(null))
System.out.println("处理前的图片大小 height:"+image.getHeight(null))
System.out.println("处理前的图片容量:"+ size +" bit")
zip.compressImage()
}
}
1.用 BufferedImage img = new BufferedImage(w,h,BufferedImage.TYPE_INT_ARGB)创建内存图；2.读入png图片
3.把所有黑色点的（r,g,b,a)中的a赋值为0。
