Ⅰ java如何實現把一個大圖片壓縮到指定大小的圖片且長寬比不變
java要實現把一個大圖片壓縮到指定大小的圖片且長寬比不變可以嘗試以下操作：
Ⅱ 如何用java 調整jepg圖片壓縮
ImageWriter writer; // 自己獲取 ImageWriter 對象
ImageWriteParam iwp = writer.getDefaultWriteParam();
iwp.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
// 參數為0和1
// 1表示設置最小的壓縮以保持最大的圖片質量
iwp.setCompressionQuality(1);
File file = new File(OUTPUTFILE);
FileImageOutputStream output = new FileImageOutputStream(file);
writer.setOutput(output);
IIOImage image = new IIOImage(BUFFEREDIMAGE, null, null);
// 寫入圖片
writer.write(null, image, iwp);
writer.dispose()
問了一下我遠標教育的哥們，希望對你有用！
Ⅲ java壓縮png圖片
您轉換的是圖片的後綴名吧？您這樣的方式已經把圖片的信息刪除了！
http://sjbbs.zol.com.cn/1/313_9068.html您去下載一個java圖片壓縮器吧
或者直接在Java下編輯代碼來實習轉換
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;
/**
* 圖片工具類
* 壓縮圖片大小
* @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; // 默認輸出圖片寬
private int outPutFileHeight = 100; // 默認輸出圖片高
private static boolean isScaleZoom = true; // 是否按比例縮放
public ZIPImage() {
outPutFilePath = "";
inPutFilePath = "";
inPutFileName = "";
autoBuildFileName = true;
outPutFileName = "";
}
/**
*
* @param ipfp
* 源文件夾路徑
* @param ipfn
* 源文件名
* @param opfp
* 目標文件路徑
* @param opfn
* 目標文件名
*/
public ZIPImage(String ipfp, String ipfn, String opfp, String opfn) {
outPutFilePath = opfp;
inPutFilePath = ipfp;
inPutFileName = ipfn;
autoBuildFileName = true;
outPutFileName = opfn;
}
/**
*
* @param ipfp
* 源文件夾路徑
* @param ipfn
* 源文件名
* @param opfp
* 目標文件路徑
* @param opfn
* 目標文件名
* @param aBFN
* 是否自動生成目標文件名
*/
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;
}
/**
* 壓縮圖片大小
*
* @return boolean
*/
public boolean compressImage() {
boolean flag = false;
try {
if (inPutFilePath.trim().equals("")) {
throw new NullPointerException("源文件夾路徑不存在。");
}
if (inPutFileName.trim().equals("")) {
throw new NullPointerException("圖片文件路徑不存在。");
}
if (outPutFilePath.trim().equals("")) {
throw new NullPointerException("目標文件夾路徑地址為空。");
} else {
if (!ZIPImage.mddir(outPutFilePath)) {
throw new FileNotFoundException(outPutFilePath
+ " 文件夾創建失敗！");
}
}
if (this.autoBuildFileName) { // 自動生成文件名
String tempFile[] = getFileNameAndExtName(inPutFileName);
outPutFileName = tempFile[0] + "_cyw." + tempFile[1];
compressPic();
} else {
if (outPutFileName.trim().equals("")) {
throw new NullPointerException("目標文件名為空。");
}
compressPic();
}
} catch (Exception e) {
flag = false;
e.printStackTrace();
return flag;
}
return flag;
}
// 圖片處理
private void compressPic() throws Exception {
try {
// 獲得源文件
file = new File(inPutFilePath + inPutFileName);
if (!file.exists()) {
throw new FileNotFoundException(inPutFilePath + inPutFileName
+ " 文件不存在！");
}
Image img = ImageIO.read(file);
// 判斷圖片格式是否正確
if (img.getWidth(null) == -1) {
throw new Exception("文件不可讀！");
} else {
int newWidth;
int newHeight;
// 判斷是否是等比縮放
if (ZIPImage.isScaleZoom == true) {
// 為等比縮放計算輸出的圖片寬度及高度
double rate1 = ((double) img.getWidth(null))
/ (double) outPutFileWidth + 0.1;
double rate2 = ((double) img.getHeight(null))
/ (double) outPutFileHeight + 0.1;
// 根據縮放比率大的進行縮放控制
double rate = rate1 > rate2 ? rate1 : rate2;
newWidth = (int) (((double) img.getWidth(null)) / rate);
newHeight = (int) (((double) img.getHeight(null)) / rate);
} else {
newWidth = outPutFileWidth; // 輸出的圖片寬度
newHeight = outPutFileHeight; // 輸出的圖片高度
}
BufferedImage tag = new BufferedImage((int) newWidth,
(int) newHeight, BufferedImage.TYPE_INT_RGB);
/*
* Image.SCALE_SMOOTH 的縮略演算法 生成縮略圖片的平滑度的 優先順序比速度高 生成的圖片質量比較好 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();
}
}
/**
* 創建文件夾目錄
*
* @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;
}
/**
* 獲得文件名和擴展名
*
* @param fullFileName
* @return
* @throws Exception
*/
private String[] getFileNameAndExtName(String fullFileName)
throws Exception {
String[] fileNames = new String[2];
if (fullFileName.indexOf(".") == -1) {
throw new Exception("源文件名不正確！");
} else {
fileNames[0] = fullFileName.substring(0, fullFileName
.lastIndexOf("."));
fileNames[1] = fullFileName
.substring(fullFileName.lastIndexOf(".") + 1);
}
return fileNames;
}
public Image getSourceImage() throws IOException{
//獲得源文件
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;
}
/*
* 獲得圖片大小
* @path ：圖片路徑
*/
public long getPicSize(String path) {
File file = new File(path);
return file.length();
}
}
//下面是測試程序
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\\","處理後的圖片.jpg",false);
zip.setOutPutFileWidth(1000);
zip.setOutPutFileHeight(1000);
Image image=zip.getSourceImage();
long size=zip.getPicSize("d:\\1.jpg");
System.out.println("處理前的圖片大小 width:"+image.getWidth(null));
System.out.println("處理前的圖片大小 height:"+image.getHeight(null));
System.out.println("處理前的圖片容量:"+ size +" bit");
zip.compressImage();
}
}
Ⅳ java將圖片按比例縮小
Image srcImg = ImageIO.read(new FileInputStream(fnSrc) );//取源圖
int width = 600; //假設要縮小到600點像素
int height = srcImg.getHeight(null)*600/srcImg.getWidth(null);//按比例，將高度縮減
System.out.println("Width: "+srcImg.getWidth(null));// 這幾行是調試用
System.out.println("Height: "+srcImg.getHeight(null));
System.out.println("Width2: "+width);
System.out.println("Height2: "+height);
Image smallImg =srcImg.getScaledInstance(width, height, Image.SCALE_SMOOTH);//縮小
Ⅳ java如何實現壓縮圖片且保留圖片原文件屬性，比如拍攝日期
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;public class Zip {
// 壓縮
public static void zip(String zipFileName, String inputFile)
throws Exception {
File f = new File(inputFile);
ZipOutputStream out = new ZipOutputStream(new FileOutputStream(
zipFileName));
zip(out, f, null);
System.out.println("zip done");
out.close();
} private static void zip(ZipOutputStream out, File f, String base)
throws Exception {
System.out.println("zipping " + f.getAbsolutePath());
if (f != null && f.isDirectory()) {
File[] fc = f.listFiles();
if (base != null)
out.putNextEntry(new ZipEntry(base + "/"));
base = base == null ? "" : base + "/";
for (int i = 0; i < fc.length; i++) {
zip(out, fc[i], base + fc[i].getName());
}
} else {
out.putNextEntry(new ZipEntry(base));
FileInputStream in = new FileInputStream(f);
int b;
while ((b = in.read()) != -1)
out.write(b);
in.close();
}
} // 解壓
public static void unzip(String zipFileName, String outputDirectory)
throws Exception {
ZipInputStream in = new ZipInputStream(new FileInputStream(zipFileName));
ZipEntry z;
while ((z = in.getNextEntry()) != null) {
String name = z.getName();
if (z.isDirectory()) {
name = name.substring(0, name.length() - 1);
File f = new File(outputDirectory + File.separator + name);
f.mkdir();
System.out.println("MD " + outputDirectory + File.separator
+ name);
} else {
System.out.println("unziping " + z.getName());
File f = new File(outputDirectory + File.separator + name);
f.createNewFile();
FileOutputStream out = new FileOutputStream(f);
int b;
while ((b = in.read()) != -1)
out.write(b);
out.close();
}
}
in.close();
} public void deleteFolder(File dir) {
File filelist[] = dir.listFiles();
int listlen = filelist.length;
for (int i = 0; i < listlen; i++) {
if (filelist[i].isDirectory()) {
deleteFolder(filelist[i]);
} else {
filelist[i].delete();
}
}
dir.delete();// 刪除當前目錄
} public static void main(String[] args) {
try {
// TestZip t = new TestZip();
// t.zip("c:\\test.zip","c:\\test");
// t.unzip("c:\\test.zip","c:\\test2");
} catch (Exception e) {
e.printStackTrace(System.out);
}
}
}
Ⅵ 求一個Java無損壓縮圖片的示例，把原圖片復制到指定目錄，按原圖比例改變尺寸，不影響圖片質量。
圖片壓縮就是講圖片的內存變小 對象數坑定有印象 你將壓縮率改小一點 調整一下壓縮率 到自己滿意為止
Ⅶ java圖片壓縮比為1
java壓縮圖片，按照比例進行壓縮
public static void main(String[] args) {
try {
//圖片所在路徑
BufferedImage templateImage = ImageIO.read(new File("C:\\Users\\晏丁丁\\Pictures\\圖片1.png"));
//原始圖片的長度和寬度
int height = templateImage.getHeight();
int width = templateImage.getWidth();
//通過比例壓縮
float scale = 0.5f;
//通過固定長度壓縮
/*int doWithHeight = 100;
int dowithWidth = 300;*/
//壓縮段唯之後的輪陸長度和寬度
int doWithHeight = (int) (scale * height);
int dowithWidth = (int) (scale * width);
BufferedImage finalImage = new BufferedImage(dowithWidth, doWithHeight, BufferedImage.TYPE_INT_RGB);
finalImage.getGraphics().drawImage(templateImage.getScaledInstance(dowithWidth, doWithHeight, java.awt.Image.SCALE_SMOOTH), 0, 0, null);
//圖片輸出路徑，以及圖握桐培片名
FileOutputStream fileOutputStream = new FileOutputStream("D:/image/tupian.jpg");
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(fileOutputStream);
encoder.encode(finalImage);
fileOutputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
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文章知
Ⅷ java如何實現把一個大圖片壓縮到指定大小的圖片且長寬比不變
java要實現把一個大圖片壓縮到指定大小的圖片且長寬比不變可以嘗試以下操作：