java实现图片格式转换为JPG

2019-11-08 19:33:24

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package org.xcj;import java.io.File; import java.io.IOException; import java.util.ArrayList;import java.util.Iterator; import javax.imageio.ImageIO; import javax.imageio.ImageReader; import javax.imageio.stream.ImageInputStream; import java.awt.image.ImagePRoducer;import com.sun.jimi.core.Jimi;import com.sun.jimi.core.JimiException;import com.sun.jimi.core.JimiWriter;import com.sun.jimi.core.options.JPGOptions;public class Test{/** * 测试函数 * @param args * @throws IOException */public static void main(String[] args) throws IOException{//图片文件夹路径String pathName = "F:/test";//存放文件名的集合ArrayList<String> fileNameList = getFileName(pathName);//遍历文件名集合Iterator<String> iter = fileNameList.iterator();while(iter.hasNext()){String fileName = iter.next();File file = new File(pathName+"/"+fileName); //判断是否为图片 boolean result = isImage(file); if(result){ //获取图片的格式 String format = getExtension(file); System.out.println("图片格式为:"+format); //将图片格式转换为JPEG if(format != "JPEG"){ //需要修改的文件路径 String input = pathName+"/"+fileName; //将文件路径改为.jpg String[] stringSplit = fileName.split("//."); String output = pathName+"/"+stringSplit[0]+".jpg"; //转换图片格式 forJpg(input,output); } } }}/** * 获取文件夹内所有的文件名 * @param pathName */public static ArrayList<String> getFileName(String pathName){//存放遍历出来的文件名字 ArrayList<String> nameList = new ArrayList<String> ();File dirFile = new File(pathName); //获取此目录下的所有文件名与目录名 String[] fileList = dirFile.list(); for(int i = 0; i < fileList.length; i++){ //遍历文件目录 String string = fileList[i]; File file = new File(dirFile.getPath(),string); String name = file.getName(); nameList.add(name); } return nameList;}/** * 获取图片格式函数 * @param file * @return */public static String getExtension(File file){//图片格式 String format = ""; ImageInputStream iis = null; try{ iis = ImageIO.createImageInputStream(file); Iterator<ImageReader> iter = ImageIO.getImageReaders(iis); if(iter.hasNext()){ format = iter.next().getFormatName(); } }catch(IOException e) { e.printStackTrace(); }finally{ if(iis!=null){ try{ iis.close(); }catch(IOException e) { e.printStackTrace(); } } } return format; }/** * 判断是否为图片函数 * @param file * @return */public static boolean isImage(File resFile){ImageInputStream iis = null; try{ iis = ImageIO.createImageInputStream(resFile); Iterator<ImageReader> iter = ImageIO.getImageReaders(iis); //文件是不是图片if(iter.hasNext()){ return true; } }catch(IOException e) { e.printStackTrace(); }finally{ if(iis!=null){ try{ iis.close(); }catch(IOException e) { e.printStackTrace(); } } } return false;}/** * 将图片格式转换为JPG格式 * @param input * @param output * @throws IOException */public static void forJpg(String input,String output) throws IOException {try{JPGOptions options = new JPGOptions(); options.setQuality(72); ImageProducer image = Jimi.getImageProducer(input); JimiWriter writer = Jimi.createJimiWriter(output); writer.setSource(image); writer.setOptions(options); writer.putImage(output); // 转换后删除原文件 File f = new File(input); f.delete();}catch(JimiException e) {System.err.println("Error: " + e); e.printStackTrace();}}}

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