本文实例讲述了java swing组件jfilechooser用法。分享给大家供大家参考，具体如下：
jfilechooser文件选择器是swing中经常用到的一个控件。它的使用主要包含以下几个参数：
1.当前路径。也就是它第一次打开时所在的路径，许多软件喜欢设置为桌面。
2.文件过滤器。通过设置文件过滤器，只有特定类型的文件是可见的，比如文本，音频，等。
3.选择模式。包含三种情况：仅文件, 仅目录, 文件或目录。
4.是否允许多选。
jfilechooser的参数当然不止以上4种，它还有很多高级选项，比如你可以对文件的显示图标进行定制等，由于不经常用，这里不再介绍。
有2个地方要注意：
1.文件过滤器建议使用filenameextensionfilter，它是filefilter的子类，以非常方便的方法实现了过滤器。用法见代码。
2.getselectedfiles()方法，它只在ismultiselectionenable()方法返回true是有效。也就是说，如果你不允许多选，则只能使用getselectedfile()方法，否则只能得到一个空的文件列表。
下面通过一个demo来展示它的基本用法。
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package awtdemo;
import java.io.file;
import javax.swing.jfilechooser;
import javax.swing.joptionpane;
import javax.swing.filechooser.filenameextensionfilter;
import javax.swing.filechooser.filesystemview;
/**
*
* @author pzy
*/
@suppresswarnings("serial")
public class jfilechooserframe extends javax.swing.jframe {
/**
* creates new form jfilechooserframe
*/
public jfilechooserframe() {
initcomponents();
}
/**
* this method is called from within the constructor to initialize the form.
* warning: do not modify this code. the content of this method is always
* regenerated by the form editor.
*/
@suppresswarnings({ "unchecked", "rawtypes" })
// <editor-fold defaultstate="collapsed" desc="generated code">
private void initcomponents() {
filefilterisbg = new javax.swing.buttongroup();
ismultiselectbg = new javax.swing.buttongroup();
jpanel1 = new javax.swing.jpanel();
text_rb = new javax.swing.jradiobutton();
video_rb = new javax.swing.jradiobutton();
audio_rb = new javax.swing.jradiobutton();
all_rb = new javax.swing.jradiobutton();
jpanel2 = new javax.swing.jpanel();
jcombobox1 = new javax.swing.jcombobox();
multiselect_rb = new javax.swing.jradiobutton();
singleselect_rb = new javax.swing.jradiobutton();
jpanel3 = new javax.swing.jpanel();
jbutton1 = new javax.swing.jbutton();
setdefaultcloseoperation(javax.swing.windowconstants.exit_on_close);
setlocationbyplatform(true);
jpanel1.setborder(javax.swing.borderfactory.createtitledborder("文件类型"));
filefilterisbg.add(text_rb);
text_rb.settext("文本");
filefilterisbg.add(video_rb);
video_rb.settext("视频");
filefilterisbg.add(audio_rb);
audio_rb.settext("音频");
filefilterisbg.add(all_rb);
all_rb.setselected(true);
all_rb.settext("所有");
javax.swing.grouplayout jpanel1layout = new javax.swing.grouplayout(jpanel1);
jpanel1.setlayout(jpanel1layout);
jpanel1layout.sethorizontalgroup(
jpanel1layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)
.addgroup(javax.swing.grouplayout.alignment.trailing, jpanel1layout.createsequentialgroup()
.addcontainergap(javax.swing.grouplayout.default_size, short.max_value)
.addcomponent(text_rb)
.addgap(29, 29, 29)
.addcomponent(video_rb)
.addgap(35, 35, 35)
.addcomponent(audio_rb)
.addgap(39, 39, 39)
.addcomponent(all_rb)
.addgap(32, 32, 32))
);
jpanel1layout.setverticalgroup(
jpanel1layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)
.addgroup(jpanel1layout.createsequentialgroup()
.addcontainergap()
.addgroup(jpanel1layout.createparallelgroup(javax.swing.grouplayout.alignment.baseline)
.addcomponent(video_rb)
.addcomponent(text_rb)
.addcomponent(audio_rb)
.addcomponent(all_rb))
.addcontainergap(javax.swing.grouplayout.default_size, short.max_value))
);
jpanel2.setborder(javax.swing.borderfactory.createtitledborder("选择模式"));
jcombobox1.setmodel(new javax.swing.defaultcomboboxmodel(new string[] { "仅文件", "仅目录", "文件或目录" }));
jcombobox1.addactionlistener(new java.awt.event.actionlistener() {
public void actionperformed(java.awt.event.actionevent evt) {
jcombobox1actionperformed(evt);
}
});
ismultiselectbg.add(multiselect_rb);
multiselect_rb.settext("可多选");
ismultiselectbg.add(singleselect_rb);
singleselect_rb.setselected(true);
singleselect_rb.settext("不可多选");
javax.swing.grouplayout jpanel2layout = new javax.swing.grouplayout(jpanel2);
jpanel2.setlayout(jpanel2layout);
jpanel2layout.sethorizontalgroup(
jpanel2layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)
.addgroup(jpanel2layout.createsequentialgroup()
.addcontainergap()
.addcomponent(jcombobox1, javax.swing.grouplayout.preferred_size, 144, javax.swing.grouplayout.preferred_size)
.addgap(18, 18, 18)
.addcomponent(multiselect_rb, javax.swing.grouplayout.preferred_size, 82, javax.swing.grouplayout.preferred_size)
.addgap(18, 18, 18)
.addcomponent(singleselect_rb, javax.swing.grouplayout.preferred_size, 82, javax.swing.grouplayout.preferred_size)
.addcontainergap(14, short.max_value))
);
jpanel2layout.setverticalgroup(
jpanel2layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)
.addgroup(jpanel2layout.createsequentialgroup()
.addcontainergap()
.addgroup(jpanel2layout.createparallelgroup(javax.swing.grouplayout.alignment.baseline)
.addcomponent(jcombobox1, javax.swing.grouplayout.preferred_size, javax.swing.grouplayout.default_size, javax.swing.grouplayout.preferred_size)
.addcomponent(multiselect_rb)
.addcomponent(singleselect_rb))
.addcontainergap(16, short.max_value))
);
jbutton1.settext("开始");
jbutton1.addactionlistener(new java.awt.event.actionlistener() {
public void actionperformed(java.awt.event.actionevent evt) {
jbutton1actionperformed(evt);
}
});
javax.swing.grouplayout jpanel3layout = new javax.swing.grouplayout(jpanel3);
jpanel3.setlayout(jpanel3layout);
jpanel3layout.sethorizontalgroup(
jpanel3layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)
.addgroup(jpanel3layout.createsequentialgroup()
.addgap(117, 117, 117)
.addcomponent(jbutton1, javax.swing.grouplayout.preferred_size, 139, javax.swing.grouplayout.preferred_size)
.addcontainergap(javax.swing.grouplayout.default_size, short.max_value))
);
jpanel3layout.setverticalgroup(
jpanel3layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)
.addgroup(jpanel3layout.createsequentialgroup()
.addgap(26, 26, 26)
.addcomponent(jbutton1, javax.swing.grouplayout.preferred_size, 32, javax.swing.grouplayout.preferred_size)
.addcontainergap(19, short.max_value))
);
javax.swing.grouplayout layout = new javax.swing.grouplayout(getcontentpane());
getcontentpane().setlayout(layout);
layout.sethorizontalgroup(
layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)
.addgroup(layout.createsequentialgroup()
.addcontainergap()
.addgroup(layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)
.addcomponent(jpanel1, javax.swing.grouplayout.default_size, javax.swing.grouplayout.default_size, short.max_value)
.addcomponent(jpanel2, javax.swing.grouplayout.default_size, javax.swing.grouplayout.default_size, short.max_value)
.addgroup(layout.createsequentialgroup()
.addcomponent(jpanel3, javax.swing.grouplayout.default_size, javax.swing.grouplayout.default_size, short.max_value)
.addgap(84, 84, 84)))
.addcontainergap())
);
layout.setverticalgroup(
layout.createparallelgroup(javax.swing.grouplayout.alignment.leading)
.addgroup(layout.createsequentialgroup()
.addgap(8, 8, 8)
.addcomponent(jpanel1, javax.swing.grouplayout.preferred_size, javax.swing.grouplayout.default_size, javax.swing.grouplayout.preferred_size)
.addgap(18, 18, 18)
.addcomponent(jpanel2, javax.swing.grouplayout.preferred_size, javax.swing.grouplayout.default_size, javax.swing.grouplayout.preferred_size)
.addgap(18, 18, 18)
.addcomponent(jpanel3, javax.swing.grouplayout.preferred_size, javax.swing.grouplayout.default_size, javax.swing.grouplayout.preferred_size)
.addcontainergap(javax.swing.grouplayout.default_size, short.max_value))
);
pack();
}// </editor-fold>
private void jcombobox1actionperformed(java.awt.event.actionevent evt) {
// todo add your handling code here:
string itemstring = jcombobox1.getselecteditem().tostring();
if ("仅文件".equals(itemstring)) {
fileselectionmode = jfilechooser.files_only;
} else if ("仅目录".equals(itemstring)) {
fileselectionmode = jfilechooser.directories_only;
} else if ("文件或目录".equals(itemstring)) {
fileselectionmode = jfilechooser.files_and_directories;
}
}
private void jbutton1actionperformed(java.awt.event.actionevent evt) {
// todo add your handling code here:
filechooser = new jfilechooser();
//初始化当前路径
filesystemview fsv = filesystemview.getfilesystemview();
file homefile =fsv.gethomedirectory(); //这便是读取桌面路径的方法了
filechooser.setcurrentdirectory(homefile);
//初始化文件过滤器
if (text_rb.isselected()) {
filter = new filenameextensionfilter("文本文件", "log", "txt");
filechooser.setfilefilter(filter);
}
if (video_rb.isselected()) {
filter = new filenameextensionfilter("视频文件", "mp4", "mkv");
filechooser.setfilefilter(filter);
}
if (audio_rb.isselected()) {
filter = new filenameextensionfilter("音频文件", "mp3", "wma");
filechooser.setfilefilter(filter);
}
//初始化选择模式
filechooser.setfileselectionmode(fileselectionmode);
//是否允许多选
if (multiselect_rb.isselected()) {
filechooser.setmultiselectionenabled(true);
}
else if(singleselect_rb.isselected()) {
filechooser.setmultiselectionenabled(false);
}
//打开文件选择器
int i = filechooser.showdialog(this, "选择");
if(i == jfilechooser.approve_option){
stringbuilder sb;
if(filechooser.ismultiselectionenabled()){
sb = new stringbuilder("您选择了以下文件：");
file [] files = filechooser.getselectedfiles();
for (file file : files) {
sb.append("\n");
sb.append(file.getname());
}
}
else{
file file = filechooser.getselectedfile();
sb = new stringbuilder("您选择的文件是：");
sb.append("\n");
sb.append(file.getname());
}
joptionpane.showmessagedialog(this, sb);
}
}
/**
* @param args the command line arguments
*/
public static void main(string args[]) {
/* set the nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" look and feel setting code (optional) ">
/* if nimbus (introduced in java se 6) is not available, stay with the default look and feel.
* for details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.uimanager.lookandfeelinfo info : javax.swing.uimanager.getinstalledlookandfeels()) {
if ("nimbus".equals(info.getname())) {
javax.swing.uimanager.setlookandfeel(info.getclassname());
break;
}
}
} catch (classnotfoundexception ex) {
java.util.logging.logger.getlogger(jfilechooserframe.class.getname()).log(java.util.logging.level.severe, null, ex);
} catch (instantiationexception ex) {
java.util.logging.logger.getlogger(jfilechooserframe.class.getname()).log(java.util.logging.level.severe, null, ex);
} catch (illegalaccessexception ex) {
java.util.logging.logger.getlogger(jfilechooserframe.class.getname()).log(java.util.logging.level.severe, null, ex);
} catch (javax.swing.unsupportedlookandfeelexception ex) {
java.util.logging.logger.getlogger(jfilechooserframe.class.getname()).log(java.util.logging.level.severe, null, ex);
}
//</editor-fold>
/* create and display the form */
java.awt.eventqueue.invokelater(new runnable() {
public void run() {
new jfilechooserframe().setvisible(true);
}
});
}
private jfilechooser filechooser;
private filenameextensionfilter filter;
private int fileselectionmode = jfilechooser.files_only;
// variables declaration - do not modify
private javax.swing.jradiobutton all_rb;
private javax.swing.jradiobutton audio_rb;
private javax.swing.buttongroup filefilterisbg;
private javax.swing.buttongroup ismultiselectbg;
private javax.swing.jbutton jbutton1;
@suppresswarnings("rawtypes")
private javax.swing.jcombobox jcombobox1;
private javax.swing.jpanel jpanel1;
private javax.swing.jpanel jpanel2;
private javax.swing.jpanel jpanel3;
private javax.swing.jradiobutton multiselect_rb;
private javax.swing.jradiobutton singleselect_rb;
private javax.swing.jradiobutton text_rb;
private javax.swing.jradiobutton video_rb;
// end of variables declaration
}
运行效果如下：
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