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：
希望本文所述对大家java程序设计有所帮助。
原文链接：http://www.cnblogs.com/pzy4447/p/6095452.html
