package com.caac.knsgl.utils;
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;
/*******************************************************************************
* 图片压缩类 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 ImgCompressUtil {
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 ImgCompressUtil() { // 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
*
* @return
*/
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 = 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";
}
/**
* 初始化参数
*
* @param inputDir
* 输入图路径
* @param outputDir
* 输出图路径
* @param inputFileName
* 输入图文件名
* @param outputFileName
* 输出图文件名
* @return
*/
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();
}
/**
* 按比例压缩图片
*
* @param inputDir
* 输入图路径
* @param outputDir
* 输出图路径
* @param inputFileName
* 输入图文件名
* @param outputFileName
* 输出图文件名
* @param width
* 压缩后的宽度
* @param height
* 压缩后的高度
* @param gp
* 是否等比缩放
* @return
*/
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();
}
/**
* 按图片大小(KB单位)循环压缩图片
*
* @param oldImgPath
* @param oldImgName
* @param newImgPath
* @param newImgName
* @param size
* KB单位
* @throws IOException
*/
public static void cycleImg(String oldImgPath, String oldImgName, String newImgPath, String newImgName,
long size) throws IOException {
ImgCompressUtil mypic = new ImgCompressUtil();
sameSizeImg(oldImgPath,oldImgName,newImgPath,newImgName);
long newSize = mypic.getPicSize(newImgPath + newImgName) / 1024;
if (newSize > size) {
cycleImg(newImgPath, newImgName, newImgPath, newImgName, size);
}
}
/**
* 按图片原高宽压缩图片
*
* @param oldImgPath
* @param oldImgName
* @param newImgPath
* @param newImgName
* @param size
* KB单位
* @throws IOException
*/
public static void sameSizeImg(String oldImgPath, String oldImgName, String newImgPath, String newImgName) throws IOException {
ImgCompressUtil mypic = new ImgCompressUtil();
File srcFile = new java.io.File(oldImgPath + oldImgName);
Image src = ImageIO.read(srcFile);
int srcWidth = src.getWidth(null);
int srcHeight = src.getHeight(null);
mypic.compressPic(oldImgPath, newImgPath, oldImgName, newImgName, srcWidth, srcHeight, true);
}
// 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) throws IOException {
ImgCompressUtil mypic = new ImgCompressUtil();
String oldImgPath = "E:\\工作需求\\贫困生申请表\\sourceImg\\";
String oldImgName = "P60906-104527.jpg";
String newImgPath = "E:\\工作需求\\贫困生申请表\\targeImg\\";
String newImgName = "test.jpg";
long size = 500;
long oldSize = mypic.getPicSize(oldImgPath + oldImgName) / 1024;
System.out.println("输入的图片大小：" + oldSize + "KB");
int start = (int)System.currentTimeMillis(); //开始时间
//cycleImg(oldImgPath, oldImgName, newImgPath, newImgName, size);
sameSizeImg(oldImgPath, oldImgName, newImgPath, newImgName);
int end = (int)System.currentTimeMillis(); //结束时间
System.out.println("总共用了:"+(end-start)+" 毫秒");
long newSize = mypic.getPicSize(newImgPath + newImgName) / 1024;
System.out.println("输出的图片大小：" + newSize + "KB");
}
}
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.regex.Pattern;
/**
* 读取文件夹下的所有附件，并把图片类型压缩公共类
*/
public class ReadFileCompressUtil {
public ReadFileCompressUtil() {
super();
}
/**
* 读取某个文件夹下的所有文件，并把图片类型压缩
* @param filepath 读取的文件夹路径
* @param targetSize 需要把图片压缩到 targetSize KB单位内
* @return
* @throws FileNotFoundException
* @throws IOException
*/
public static boolean readfile(String filepath, long targetSize) throws FileNotFoundException, IOException {
String reg = ".+(.JPEG|.jpeg|.JPG|.jpg|.GIF|.gif|.BMP|.bmp|.PNG|.png)$"; //图片类型 正则表达式
Pattern pattern = Pattern.compile(reg);
try {
File file = new File(filepath);
if (!file.isDirectory()) { //文件
} else if (file.isDirectory()) { //文件夹
String[] filelist = file.list();
for (int i = 0; i < filelist.length; i++) {
File readfile = new File(filepath + "\\" + filelist[i]);
if (!readfile.isDirectory()) {
String sourcePath = filepath + "\\";
String sourceName = readfile.getName();
long size = readfile.length() / 1024; //KB
if (targetSize >0 && pattern.matcher(sourcePath + sourceName).find() && size > targetSize) { //图片类型，并且大于所需的格式大小,则压缩
new ImgCompressUtil().cycleImg(sourcePath, sourceName, sourcePath, sourceName, targetSize);
}else{ //不指定压缩大小
new ImgCompressUtil().sameSizeImg(sourcePath, sourceName, sourcePath, sourceName);
}
} else if (readfile.isDirectory()) {
readfile(filepath + "\\" + filelist[i], targetSize);
}
}
}
} catch (FileNotFoundException e) {
System.out.println("readfile() Exception:" + e.getMessage());
}
return true;
}
public static void main(String[] args) {
try {
//1,文件夹路径,压缩图片,指定大小(KB)
// readfile("E:\\工作需求\\贫困生申请表\\targeImg", 100);
//2,文件夹路径,压缩图片,不指定大小,第二个参数小于0即可
readfile("E:\\工作需求\\贫困生申请表\\targeImg", -1);
} catch (FileNotFoundException ex) {
} catch (IOException ex) {
}
System.out.println("ok");
}
}
--摘自 困难生申请的公共类