import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.util.Scanner; import javax.imageio.*;public class FormatConversion {  public static final String JPG = "jpg";  public static final String GIF = "gif";  public static final String PNG = "png";  public static final String BMP = "bmp";  public static void main(String[] args) {    String src = "E://2.";    new FormatConversion().Conversion(JPG,PNG,src);//JPG轉成PNG    new FormatConversion().Conversion(JPG,GIF,src);//JPG轉成GIF    new FormatConversion().Conversion(JPG,BMP,src);//JPG轉成BMP    //其余格式轉化只要調用Conversion函數即可  }     //inputFormat表示原格式，outputFormat表示轉化后的格式  public void Conversion(String inputFormat,String outputFormat,String src){         try {      File input = new File(src+inputFormat);      BufferedImage bim = ImageIO.read(input);      File output = new File(src+outputFormat);      ImageIO.write(bim, outputFormat, output);    } catch (IOException e) {      e.printStackTrace();    }  } }

import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import javax.imageio.ImageIO;public class ConverterUtil {  // JGP格式  public static final String JPG = "jpeg";  // GIF格式  public static final String GIF = "gif";  // PNG格式  public static final String PNG = "png";  // BMP格式  public static final String BMP = "bmp";     public static void converter(File imgFile,String format,File formatFile)      throws IOException{    BufferedImage bIMG =ImageIO.read(imgFile);    ImageIO.write(bIMG, format, formatFile);  }      public static void main(String[] args) {    try {      // 轉換為JGP      ConverterUtil.converter(new File("c://psb.jpg"),JPG, new File("c://psb2.jpg"));      // 轉換為GIF      ConverterUtil.converter(new File("c://psb.jpg"),GIF, new File("c://psb2.gif"));      // 轉換為PNG      ConverterUtil.converter(new File("c://psb.jpg"),PNG, new File("c://psb2.png"));      // 轉換為BMP      ConverterUtil.converter(new File("c://psb.jpg"),BMP, new File("c://psb2.bmp"));    } catch (IOException e) {      e.printStackTrace();    }  }}

package cn.xsbiz.servlet.test;  import java.io.FileOutputStream; import java.io.OutputStream;  import javax.media.jai.JAI; import javax.media.jai.RenderedOp;  import com.sun.media.jai.codec.BMPEncodeParam; import com.sun.media.jai.codec.ImageCodec; import com.sun.media.jai.codec.ImageEncoder; import com.sun.media.jai.codec.JPEGEncodeParam;  /*  * 可以實現jpg/tif/bmp 等圖片之間格式得互相轉換  */ public class Test {    public static void main(String[] args) throws Exception {      /* tif轉換到jpg格式 */     String input2 = "d:/img/a.tif";     String output2 = "d:/img/a.jpg";     RenderedOp src2 = JAI.create("fileload", input2);     OutputStream os2 = new FileOutputStream(output2);     JPEGEncodeParam param2 = new JPEGEncodeParam();     //指定格式類型，jpg 屬于 JPEG 類型     ImageEncoder enc2 = ImageCodec.createImageEncoder("JPEG", os2, param2);     enc2.encode(src2);     os2.close();               /*tif轉換到bmp格式*/     String inputFile = "d:/img/b.tif";     String outputFile = "d:/img/b.bmp";     RenderedOp src = JAI.create("fileload", inputFile);     OutputStream os = new FileOutputStream(outputFile);     BMPEncodeParam param = new BMPEncodeParam();     ImageEncoder enc = ImageCodec.createImageEncoder("BMP", os,param);     enc.encode(src);     os.close();//關閉流          //其他的一樣的方式轉換    }  }