图片查看器
程序员文章站
2023-04-04 12:18:08
1.下面一段代码，不知道是怎么打开图片文件的。 运行后打开图片： ......
1.下面一段代码，不知道是怎么打开图片文件的。
/**
* @author steven
* func: 查看照片
* created : 2019-8-17
*/
import java.awt.eventqueue;
import java.awt.event.actionevent;
import java.awt.event.actionlistener;
import java.awt.event.keyevent;
import java.io.file;
import javax.swing.imageicon;
import javax.swing.jdialog;
import javax.swing.jfilechooser;
import javax.swing.jframe;
import javax.swing.jlabel;
import javax.swing.jmenu;
import javax.swing.jmenubar;
import javax.swing.jmenuitem;
import javax.swing.keystroke;
import javax.swing.swingconstants;
public class imageviewerdemo {
public static void main(string[] args) {
eventqueue.invokelater(()->{
jframe frame = new imageviewerframe();
frame.setvisible(true);
});
}
}
class imageviewerframe extends jframe{
private static final long serialversionuid = 1l;
private jlabel label;
private jfilechooser chooser;
private static final int default_width = 800;
private static final int default_height = 600;
//无参构造
public imageviewerframe() {
settitle("图片查看器");
setdefaultcloseoperation(jframe.exit_on_close);
//定义标签
setbounds(300,100,default_width, default_height);
label = new jlabel();
add(label);
//定义文件选择器
chooser = new jfilechooser();
chooser.setcurrentdirectory(new file("."));
//定义菜单栏
jmenubar menubar = new jmenubar();
setjmenubar(menubar);
//定义"文件"菜单
jmenu filemenu = new jmenu("文件(f)");
filemenu.setmnemonic(keyevent.vk_f); //文件快捷键：alt + f
menubar.add(filemenu);
//定义"帮助"菜单
jmenu helpmenu = new jmenu("帮助(h)");
filemenu.setmnemonic(keyevent.vk_h); //帮助快捷键: alt + h
menubar.add(helpmenu);
//定义"帮助"菜单项
jmenuitem aboutitem = new jmenuitem("关于(a)");
aboutitem.setaccelerator(keystroke.getkeystroke(keyevent.vk_a, keyevent.alt_down_mask)); //关于加速键：alt + a
helpmenu.add(aboutitem);
aboutitem.addactionlistener(new actionlistener() {
@override
public void actionperformed(actionevent e) {
jdialog aboutdialog = new jdialog();
aboutdialog.settitle("关于" + (new imageviewerframe()).gettitle());
aboutdialog.setresizable(false);
aboutdialog.setbounds(600, 300, 200, 100);
jlabel aboutcontentlabel = new jlabel();
aboutcontentlabel.settext("<html><body>图片查看器<br>作者:steven<br>邮箱:99388239@qq.com</body></html>");
aboutcontentlabel.sethorizontalalignment(swingconstants.center);
aboutdialog.add(aboutcontentlabel);
aboutdialog.setvisible(true);
}
});
//定义"打开"菜单项
jmenuitem openitem = new jmenuitem("打开(o)");
openitem.setaccelerator(keystroke.getkeystroke(keyevent.vk_o, keyevent.alt_down_mask));//打开加速键：alt + o
filemenu.add(openitem);
openitem.addactionlistener(event -> {
int result = chooser.showopendialog(null);
if(result == jfilechooser.approve_option) {
string name = chooser.getselectedfile().getpath();
label.seticon(new imageicon(name));
}
});
//定义"退出"菜单项
jmenuitem exititem = new jmenuitem("退出(q)");
exititem.setaccelerator(keystroke.getkeystroke(keyevent.vk_q, keyevent.alt_down_mask)); //退出加速键：alt + q
exititem.setmnemonic(keyevent.vk_q);
filemenu.add(exititem);
exititem.addactionlistener(event -> system.exit(0));
}
}
运行后打开图片：