本文实例讲述了java文本编辑器实现方法。分享给大家供大家参考，具体如下：
结构分析：
- 界面布局 ： editframe
- main方法所在： edittext
- 打开功能实现： filereadthread
- 保存跟能实现： save
实际运行效果：
附：完整代码实现
一、 editframe
包括一个菜单menu
底部：日期时间
代码附上：
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public class editframe extends jframe { // todo 自动生成的构造函数存根 boolean saveflag = false; file savefileroot = null; jframe jframe; jpanel jpanelsouth; jmenubar jmenubar1; jmenu jmenu1; jmenuitem jmenuitem1; jmenuitem jmenuitem2; jmenuitem jmenuitem3; jmenuitem jmenuitem4; jseparator jseparator1; jtextarea jtextarea; jscrollpane scrollpane;// 滚动条 public editframe() { // todo 自动生成的构造函数存根 jframe = new jframe("水中鱼之1999-文本编辑器"); jpanelsouth = new jpanel(); jmenubar1 = new jmenubar(); jmenu1 = new jmenu("文件"); jmenuitem1 = new jmenuitem("打开"); jmenuitem2 = new jmenuitem("保存"); jmenuitem3 = new jmenuitem("另存为"); jmenuitem4 = new jmenuitem("退出"); jseparator1 = new jseparator(); jtextarea = new jtextarea(); scrollpane = new jscrollpane(jtextarea); jframe.setsize(800, 500); jframe.setlocationrelativeto(null); jframe.setvisible(false); setlayout(); setsouthpanel(); // set relationship for your component setrelationship(); // 设置 scrollpane for textarea setscscrollpane(); iniclick(); } private void setrelationship() { jframe.add(borderlayout.center, scrollpane); jframe.add(borderlayout.south, jpanelsouth); jmenu1.add(jmenuitem1); jmenu1.add(jmenuitem2); jmenu1.add(jmenuitem3); jmenu1.add(jseparator1); jmenu1.add(jmenuitem4); jmenubar1.add(jmenu1); jframe.setjmenubar(jmenubar1); } private void setlayout() { gridlayout gridlayout = new gridlayout(1, 2); jpanelsouth.setlayout(gridlayout); } private void setscscrollpane() {// jtextarea.setlinewrap(true);// 设置满一行自动换行 scrollpane.sethorizontalscrollbarpolicy(jscrollpane.horizontal_scrollbar_as_needed); scrollpane.setverticalscrollbarpolicy(jscrollpane.vertical_scrollbar_as_needed); } private void setsouthpanel() { // add time for southpanel jlabel jlabeldate = new jlabel("date"); jlabel jlabeltime = new jlabel("time"); timer timeaction = new timer(1000, new actionlistener() { public void actionperformed(actionevent e) { long timemillis = system.currenttimemillis(); // 转换日期显示格式 simpledateformat date = new simpledateformat("yyyy 年 mm 月 dd 日 "); jlabeldate.settext(" 当前日期： " + date.format(new date(timemillis))); simpledateformat time = new simpledateformat("hh:mm:ss "); jlabeltime.settext(" 当前时间： " + time.format(new date(timemillis))); } }); jpanelsouth.add(jlabeldate); jpanelsouth.add(jlabeltime); timeaction.start(); } private void iniclick() { jframe.addwindowlistener(new windowlistener() { @override public void windowopened(windowevent e) { // todo auto-generated method stub } @override public void windowiconified(windowevent e) { // todo auto-generated method stub } @override public void windowdeiconified(windowevent e) { // todo auto-generated method stub } @override public void windowdeactivated(windowevent e) { // todo auto-generated method stub } @override public void windowclosing(windowevent e) { // todo auto-generated method stub int x = joptionpane.showconfirmdialog(null, "确认退出么？", "友情提示", joptionpane.ok_cancel_option, joptionpane.warning_message); if (x == 0) { system.exit(0); } } @override public void windowclosed(windowevent e) { // todo auto-generated method stub } @override public void windowactivated(windowevent e) { // todo auto-generated method stub } }); jmenuitem4.addactionlistener(new actionlistener() { @override public void actionperformed(actionevent e) { // todo auto-generated method stub int x = joptionpane.showconfirmdialog(null, "确认退出么？", "友情提示", joptionpane.ok_cancel_option, joptionpane.warning_message); if (x == 0) { system.exit(0); } } }); jmenuitem1.addactionlistener(new actionlistener() { @override public void actionperformed(actionevent e) { // todo auto-generated method stub filereadthread filereadthread = new filereadthread(editframe.this);// 开启文件读取线程 filereadthread.start(); system.out.println(savefileroot); saveflag = true; jtextarea.settext(""); } }); jmenuitem3.addactionlistener(new actionlistener() { @override public void actionperformed(actionevent e) { // todo auto-generated method stub save save = new save(editframe.this); save.start(); saveflag = true; } }); jmenuitem2.addactionlistener(new actionlistener() { @override public void actionperformed(actionevent e) { // todo auto-generated method stub if (!saveflag) { save save = new save(editframe.this); save.start(); saveflag = true; } else { new save(editframe.this, savefileroot); } } }); } public jtextarea getjtextarea() { return jtextarea; } public void setjtextarea(jtextarea jtextarea) { this.jtextarea = jtextarea; } public file getsavefileroot() { return savefileroot; } public void setsavefileroot(file savefileroot) { this.savefileroot = savefileroot; } public jframe getjframe() { return jframe; } public void setjframe(jframe jframe) { this.jframe = jframe; }} |
二、测试类 edittext
分两部分：
1.闪屏 由于加载页面需要时间 原想用 splashscreen 由于打包成jar包才能用所以这里用jframe进行替代
闪屏图片直接粘贴到：
2.new 一个editframe 对象， 闪屏结束后设置为可见
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public class edittext { public static void main(string[] args) { new thread() { @override public void run() { // todo auto-generated method stub editframe editframe = new editframe(); jframe jframe = new jframe(); jpanel jpanel = new javax.swing.jpanel(){ protected void paintcomponent(java.awt.graphics g){ super.paintcomponent(g); g.drawimage(new imageicon("experiment_bac.jpg").getimage(),0,0,400,250,null); } }; jframe.add(jpanel); jframe.setvisible(true); jframe.setsize(400, 300); jframe.setlocationrelativeto(null); try { sleep(1500); } catch (interruptedexception e) { // todo auto-generated catch block e.printstacktrace(); } jframe.dispose(); editframe.getjframe().setvisible(true); } }.start(); }} |
三、filereadthread
调用swing自带的 jfilechooser
选择文件路径
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class filereadthread extends thread { private editframe test; public filereadthread(editframe test ) { this.test = test; } @override public void run() { jfilechooser chooser = new jfilechooser("d:/"); chooser.setfilefilter(new filefilter() {// 定义文件过滤器,仅显示文件夹和txt文本 @override public string getdescription() { return null; } @override public boolean accept(file file) { if (file.isdirectory() || file.getname().endswith(".txt")) return true; return false; } }); int option = chooser.showopendialog(test); if (option == jfilechooser.approve_option) { file selfile = chooser.getselectedfile(); try { bufferedreader reader = new bufferedreader(new inputstreamreader(new fileinputstream(selfile), "gbk")); test.setsavefileroot(selfile); string line = null; while ((line = reader.readline()) != null) { test.getjtextarea().append(line + "\n"); thread.sleep(30);// 线程暂停,以看到读取过程效果 } } catch (exception e1) { e1.printstacktrace(); } joptionpane.showmessagedialog(test, "读取完毕"); } }} |
四、save 保存
保存的调用分三种：
- 如果该文件是打开的 那么保存到打开文件中
- 如果该文件还未保存 这调用：进行保存
- 如果该文件已经另存为，则直接保存到另存为得的目录下
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public class save extends thread { private editframe area; private file savefileroot = null; public save(editframe area, file savefileroot) { system.out.println(savefileroot + "123"); string text = area.getjtextarea().gettext(); string[] lines = text.trim().split("\n"); try { printwriter out = new printwriter(new fileoutputstream(savefileroot), true); for (string line : lines) out.println(line); } catch (filenotfoundexception e) { // todo auto-generated catch block e.printstacktrace(); } } public save(editframe area) { this.area = area; jfilechooser chooser = new jfilechooser(); chooser.setcurrentdirectory(new file(".")); chooser.setfilefilter(new filefilter() { @override public boolean accept(file f) { return f.getname().tolowercase().endswith(".txt"); } @override public string getdescription() { return "save to"; } }); int r = chooser.showsavedialog(area); if (r != jfilechooser.approve_option) return; file f = chooser.getselectedfile(); area.setsavefileroot(f); string text = area.getjtextarea().gettext(); string[] lines = text.trim().split("\n"); try { printwriter out = new printwriter(new fileoutputstream(f), true); for (string line : lines) out.println(line); } catch (filenotfoundexception e) { // todo auto-generated catch block e.printstacktrace(); } } public file getsavefileroot() { return savefileroot; } public void setsavefileroot(file savefileroot) { this.savefileroot = savefileroot; }} |
希望本文所述对大家java程序设计有所帮助。
原文链接：https://blog.csdn.net/qq_43377749/article/details/85091983
