【批量改变图片大小】

/*

 *  此代码是实现Java的批量改变图片的大小

*/

import java.awt.BorderLayout;
import java.awt.Font;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.awt.image.RenderedImage;
import java.io.*;
import javax.imageio.*;
import javax.swing.*;
import java.awt.GridLayout;
public class PicPro extends WindowAdapter implements ActionListener{
 JFrame frame;
 JPanel panel1,panel3,panel4,panel5;
 JTextField tf1,tf2,tf3,tf4;
 JTextArea ta;
 JLabel label1,label2,label3,label4;
 JButton button,button1,button2;
 Font font1=new Font("宋体",Font.PLAIN,20);
 Font font2=new Font("宋体",Font.PLAIN,16);
 
 File filein;
 File fileout;
 File[]filelist;
 File wzw=new File("wzw");
 int width;
 int height;
 boolean flag_in;
 boolean flag_out;
 boolean flag_num;
 
 PicPro(){
  frame=new JFrame("批量图片处理");
  frame.setSize(500,600);
  frame.setLocation(300,100);
  frame.setResizable(false);
  panel1=new JPanel();
  panel3=new JPanel();
  panel4=new JPanel();
  panel5=new JPanel();
  tf1=new JTextField(30);
  tf2=new JTextField(30);
  tf3=new JTextField(7);
  tf4=new JTextField(7);
  tf1.setFont(font1);
  tf2.setFont(font1);
  tf3.setFont(font1);
  tf4.setFont(font1);
  label1=new JLabel("源文件夹");
  label2=new JLabel("目标文件夹");
  label3=new JLabel("转换后X:");
  label4=new JLabel("转换后Y:");
  label1.setFont(font2);
  label2.setFont(font2);
  label3.setFont(font2);
  label4.setFont(font2);
  ta=new JTextArea();
  ta.setFont(font2);
  ta.setEditable(false);
  ta.setLineWrap(true);
  JScrollPane scroller=new JScrollPane(ta);
  scroller.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
  frame.add(scroller,BorderLayout.CENTER);
  ta.setText("请注意各项的填写格式,区分大小写:\n"+
    "源文件夹填写要转换图片集所在文件夹,例如'D:\\picture\\';\n"+
    "目标文件夹填写转换后保存的文件夹,例如'C:\\picture\\';\n"+
    "转换后X：填写希望转换后图片的宽度(整数);\n"+
    "转换后Y：填写希望转换后图片的高度(整数);\n"+
    "当源文件夹中有非图片格式文件或文件夹时，程序会自动选择出图片文件\n"+
    "Change之前请先Check,当目标文件夹中重名情况时，程序会给出是否覆盖提示.\n"+
    "\t\t\t程序问题发送到[e-mail]\n");
  button=new JButton("Change");
  button1=new JButton("Check");
  button2=new JButton("Check");
  button.setFont(font2);
  button1.setFont(font2);
  button2.setFont(font2);
  panel1.setLayout(new GridLayout(3,1));
  panel1.add(panel3);
  panel1.add(panel4);
  panel1.add(panel5);
  panel3.add(label1);
  panel3.add(tf1);
  panel3.add(button1);
  panel4.add(label2);
  panel4.add(tf2);
  panel4.add(button2);
  panel5.add(label3);
  panel5.add(tf3);
  panel5.add(label4);
  panel5.add(tf4);
  panel5.add(button);
  frame.add(panel1,BorderLayout.NORTH);
  frame.setVisible(true);
  
  button.addActionListener(this);
  button1.addActionListener(this);
  button2.addActionListener(this);
  frame.addWindowListener(this);
 }
 public void actionPerformed(ActionEvent e){
  if(e.getSource()==button){
   flag_num=false;
   if(checkNum(tf3.getText())==true&&checkNum(tf4.getText())){
    width=(int) Double.parseDouble(tf3.getText());
    height=(int) Double.parseDouble(tf4.getText());
    flag_num=true;
   }
   else {
    flag_num=false;
    ta.append("XY填写格式不正确,请重新填写\n");
   }
   if(flag_in==true&&flag_out==true&&flag_num==true){
    ta.append("目标文件列表\n");
    int cnt=0;
    for(int i=0;i<filelist.length;i++){
     if(filelist[i]!=wzw){
      File outtemp;
      try {
       RenderedImage im=convert(width,height,ImageIO.read(filelist[i]));
       String outputFilename=filelist[i].getName();
       String format=outputFilename.substring(outputFilename.lastIndexOf('.')+1);
       outtemp=new File(fileout+"\\"+outputFilename);
       //System.out.println(outputFilename);
       if(outtemp.exists()==true){
        int restartChoose=JOptionPane.showConfirmDialog(frame,"有相同名称的文件，是否覆盖？","提示",JOptionPane.OK_CANCEL_OPTION);
        if(restartChoose==JOptionPane.OK_OPTION){
         ImageIO.write(im,format,outtemp);
         ta.append(outtemp.getAbsolutePath());
         ta.append("\t\t"+"Finished"+"\n");
         cnt++;
        }
        else{   
         return;
        }
       }
       else{
        ImageIO.write(im,format,outtemp);
        ta.append(outtemp.getAbsolutePath());
        ta.append("\t\t"+"Finished"+"\n");
        cnt++;
       }
      }catch (IOException e2) {
       e2.printStackTrace();
      } catch (Exception e1) {
       e1.printStackTrace();
      }
     }
    }
    ta.append("目标文件共"+cnt+"个\n");
   }
  }
  
  else if(e.getSource()==button1){
   flag_in=false;
   filein=new File(tf1.getText());
   if(filein.exists()==true&&filein.isDirectory()==true){
    ta.append("\n源文件夹填写格式正确\n");
    flag_in=true;
    filelist=filein.listFiles();
    for(int i=0;i<filelist.length;i++){
     if(filelist[i].isFile()==false){
      filelist[i]=wzw;
     }
    }
    String ispic;
    for(int i=0;i<filelist.length;i++){
     if(filelist[i]!=wzw){
      String temp;
      temp=filelist[i].getName();
      ispic=temp.substring(temp.lastIndexOf('.')+1);
      if((ispic.equals("jpg")==false)&&(ispic.equals("bmp")==false)&&
        (ispic.equals("gif")==false)&&(ispic.equals("png")==false)&&
        (ispic.equals("JPG")==false)&&(ispic.equals("BMP")==false)&&
        (ispic.equals("GIF")==false)&&(ispic.equals("PNG")==false)){
       filelist[i]=wzw;
      }
     }
    }
    ta.append("源文件列表:\n");
    int num=0;
    for(int i=0;i<filelist.length;i++){
     if(filelist[i]!=wzw){
      ta.append(filelist[i]+"\n");
      num++;
     }
    }
    ta.append("源文件共"+num+"个\n");
    ta.append("\n");
   }
   else{
    ta.append("\n源文件夹不存在或者输入格式错误！\n");
    flag_in=false;
   }
   
  }
  else if(e.getSource()==button2){
   flag_out=false;
   fileout=new File(tf2.getText());
   if(fileout.exists()==true&&fileout.isDirectory()==true){
    ta.append("目标文件夹填写格式正确\n");
    flag_out=true;
    
   }
   else {
    ta.append("\n目标文件夹不存在或者输入格式错误！\n");
    flag_out=false;
   }
  }
 }
 public void windowClosing(WindowEvent e){             
     System.exit(0);
    }
 public static void main(String[] args) throws Exception {
  try { 
   UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel"); 
  }
  catch(Exception e) { 
  }
  new PicPro();  
 }
 public static BufferedImage convert(int width,int height,BufferedImage input)throws Exception{
  BufferedImage output=new BufferedImage(width,height,
  BufferedImage.TYPE_INT_RGB);
  Image image=input.getScaledInstance(output.getWidth(),
    output.getHeight(),output.getType());
  output.createGraphics().drawImage(image,null,null);
  return output;
 }
 public static boolean checkNum(String s){                   //判断String是否为可转化为数字的字符串
     int i;
     boolean flag=false;
     char paste_ch[]=s.toCharArray();
     for(i=0;i<s.length();i++){
      if((paste_ch[i]!='1')&&(paste_ch[i]!='2')&&(paste_ch[i]!='3')&&(paste_ch[i]!='4')&&
       (paste_ch[i]!='5')&&(paste_ch[i]!='6')&&(paste_ch[i]!='7')&&(paste_ch[i]!='8')&&
        (paste_ch[i]!='9')&&(paste_ch[i]!='0')&&(paste_ch[i]!='.')&&(paste_ch[i]!='-')){
       flag=false;
       break;
      }
      if((s.contains("-")==true&&s.startsWith("-")==false)||(s.contains(".")==true&&s.startsWith(".")==true)){
       flag=false;
       break;
      } 
      flag=true;  
     }
     return flag;
    }
}