javax.swing.filechooser 文件选择器

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import java.io.File;
import java.io.FileWriter;

import javax.swing.JFileChooser;
public class TestSaveAS{

public void openDic(){

  String[] saveType = {"txt","java"};

  JFileChooser fd = new JFileChooser();  //实例化选择器

  //fd.setCurrentDirectory(new File("e:/"));//设置默认目录打开直接默认E盘

  //是否可多选
  fd.setMultiSelectionEnabled(true);
  //选择模式，可选择文件和文件夹
  //fd.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);

  //      fc.setFileSelectionMode(JFileChooser.FILES_ONLY);
  //fd.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY); //这里去掉否则默认文件名无法使用
  //fd.setDialogTitle("保存文件");     //自定义选择框标题
  fd.setSelectedFile(new File("test.java")); //设置默认文件名
      //设置是否显示隐藏文件
  fd.setFileHidingEnabled(true);
  fd.setAcceptAllFileFilterUsed(false);
  fd.setFileFilter(new ImgFileFilter2());

  //设置文件筛选器
  //fd.setFileFilter(new MyFilter("java"));
  //fd.setFileFilter(new MyFilter("zip"));
  //如果还想限制文件类型

//
//FileFilter filter = new FileNameExtensionFilter("JPEG file", "jpg", "jpeg");

fd.setFileFilter(new javax.swing.filechooser.FileNameExtensionFilter("text & java",saveType));
fd.setFileFilter(new javax.swing.filechooser.FileNameExtensionFilter("word","word"));

  //fd.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
  fd.showOpenDialog(null);
  File f = fd.getSelectedFile();
  System.out.println("==========="+f.getName()+"============"+f.getAbsolutePath()+"===="+f.getParent()+"==="+f.getPath());
  if(f != null){}

}

public void saveFile(){
  JFileChooser jf = new JFileChooser();
  //jf.setFileSelectionMode(JFileChooser.SAVE_DIALOG | JFileChooser.DIRECTORIES_ONLY); //FILES_ONLY
  //jf.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
  jf.showDialog(null,null);
  jf.setSelectedFile(new File("test.java")); //设置默认文件名
  File fi = jf.getSelectedFile();

  System.out.println("=========="+fi.getAbsolutePath()+"============"+fi.getParent()+"========"+fi.getPath());
  String f = fi.getAbsolutePath()+"\\test.txt";
  System.out.println("save: "+f);
  try{
      FileWriter out = new FileWriter(f);
      out.write("successful!!!");
      out.close();
  }
  catch(Exception e){}

}

}

//过滤器
//java.io.FileFilter
class ImgFileFilter1 implements java.io.FileFilter{

/* (non-Javadoc)
* @see java.io.FileFilter#accept(java.io.File)
*/
public boolean accept(File file) {
  String filename = file.getName().toLowerCase();
  // TODO Auto-generated method stub
  return filename.endsWith(".gif")
    ||filename.endsWith(".bmp")
    ||filename.endsWith(".png")
    ||filename.endsWith(".jpeg")
    ||filename.endsWith(".jpg")
    ||file.isDirectory();
}

}

//javax.swing.filechooser.filefilter

class ImgFileFilter2 extends javax.swing.filechooser.FileFilter{

/* (non-Javadoc)
* @see javax.swing.filechooser.FileFilter#accept(java.io.File)
*/
@Override
public boolean accept(File file) {
  String filename = file.getName().toLowerCase();
  // TODO Auto-generated method stub
  return filename.endsWith(".gif")
    ||filename.endsWith(".bmp")
    ||filename.endsWith(".png")
    ||filename.endsWith(".jpeg")
    ||filename.endsWith(".jpg")
    ||file.isDirectory();
}

/* (non-Javadoc)
* @see javax.swing.filechooser.FileFilter#getDescription()
*/
@Override
public String getDescription() {
  // TODO Auto-generated method stub
  return "*.gif,*.bmp,*.png,*.jpeg,*.jpg";
}

}
//Test
class TestFileFilter{
public void test(){
  java.io.File file = new java.io.File("F:\\");
  File[] files = file.listFiles(new ImgFileFilter1());
  for(File f:files){
   System.out.println(f.getAbsolutePath());
  }

  javax.swing.JFileChooser fc = new javax.swing.JFileChooser("F:\\");
  fc.setFileFilter(new ImgFileFilter2());
  fc.showOpenDialog(null);
  }
}

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