Java Swing 多线程加载图片（保证顺序一致）

大二的时候做的课程设计，图片管理器，当时遇到图片很多的文件夹，加载顺序非常慢。虽然尝试用多个thread加载图片，却无法保证图片按顺序加载。直到今天学会了使用callable接口和future接口，于是心血来潮实现了这个功能。

废话不多说，看代码。

多线程加载图片（核心）：

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package com.lin.imagemgr;

import java.awt.dimension;

import java.awt.image.bufferedimage;

import java.io.file;

import java.io.filenamefilter;

import java.io.ioexception;

import java.util.arraylist;

import java.util.list;

import java.util.concurrent.executionexception;

import java.util.concurrent.executorservice;

import java.util.concurrent.executors;

import java.util.concurrent.future;

import java.util.stream.collectors;

import javax.swing.imageicon;

import javax.swing.jlabel;

import net.coobird.thumbnailator.thumbnails;

public class imagemgr {

private static imagemgr instance = new imagemgr();

private imagemgr() {}

public static imagemgr getinstance() {

return instance;

}

//线程池

private executorservice executor = executors.newfixedthreadpool(8);

public list<jlabel> loadimages(string path) {

list<jlabel> images = new arraylist<>();

file file = new file(path);

if (!file.isdirectory()) {

throw new runtimeexception("need directory!");

}

file[] files = file.listfiles(new filenamefilter() {

@override

public boolean accept(file dir, string name) {

//thumbnail只支持jpg??

if (name.endswith(".jpg")) {

return true;

}

return false;

}

});

//并发加载图片，并使用future保存加载结果

list<future<mylabel>> futures = new arraylist<>();

for (final file f : files) {

future<mylabel> future = executor.submit(() -> {

return new mylabel(f.getname(), f.getabsolutepath());

});

futures.add(future);

}

//等待所有并发加载返回结果

try {

for (future<mylabel> future : futures) {

mylabel icon = future.get();

images.add(icon);

}

} catch (interruptedexception e) {

e.printstacktrace();

} catch (executionexception e) {

e.printstacktrace();

}

//java8使用stream api 进行排序

list<jlabel> sortedlist = images.stream().sorted().collect(collectors.tolist());

return sortedlist;

}

//继承jlabel并实现comparable接口，从而对jlabel进行排序

private static class mylabel extends jlabel implements comparable<mylabel>{

private static final long serialversionuid = 1l;

private string filename;

public mylabel(string filename, string fullpath) {

this.filename = filename;

//使用thumbnailator生成缩略图

try {

bufferedimage bufferedimage = thumbnails.of(fullpath)

.size(100, 120)

.asbufferedimage();

seticon(new imageicon(bufferedimage));

setpreferredsize(new dimension(100, 120));

} catch (ioexception e) {

e.printstacktrace();

}

@override

public int compareto(mylabel o) {

int result = this.filename.compareto(o.filename);

return result;

}

swing界面：

package com.lin.imagemgr;

import java.awt.borderlayout;

import java.awt.dimension;

import java.awt.flowlayout;

import java.util.list;

import javax.swing.jbutton;

import javax.swing.jframe;

import javax.swing.jlabel;

import javax.swing.jpanel;

import javax.swing.jscrollpane;

import javax.swing.jtextfield;

public class mainframe extends jframe{

private static final long serialversionuid = 1l;

private jtextfield pathfield;

private jbutton showbtn;

private jpanel contentpanel;

public void init() {

jpanel toppanel = new jpanel(new flowlayout(flowlayout.left, 5, 0));

toppanel.setpreferredsize(new dimension(800, 40));

pathfield = new jtextfield(50);

showbtn = new jbutton("显示图片");

toppanel.add(pathfield);

toppanel.add(showbtn);

getcontentpane().add(borderlayout.north, toppanel);

contentpanel = new jpanel();

contentpanel.setlayout(new flowlayout(flowlayout.left, 5, 5));

contentpanel.setpreferredsize(new dimension(750, 1800));

jscrollpane jsp = new jscrollpane(contentpanel);

getcontentpane().add(borderlayout.center, jsp);

showbtn.addactionlistener((e) -> {

try {

loadimages();

} catch (exception ex) {

ex.printstacktrace();

}

});

setsize(800, 650);

setdefaultcloseoperation(jframe.exit_on_close);

setlocationrelativeto(null);

setvisible(true);

}

public void loadimages() {

contentpanel.removeall();

string path = pathfield.gettext();

long start = system.currenttimemillis();

list<jlabel> images = imagemgr.getinstance().loadimages(path);

for (jlabel label :images) {

contentpanel.add(label);

}

contentpanel.updateui();

long end = system.currenttimemillis();

system.out.println("加载需要" + (end - start) + "毫秒！");

}

public static void main(string[] args) {

new mainframe().init();

}

运行结果

在我的电脑上，加载92张图片并渲染到界面上，总共花了1568毫秒。大家可以找一个图片很多的文件夹，尝试加载大量图片的情况。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持快网idc。

原文链接：http://blog.csdn.net/qq_21508059/article/details/78743696

Java Swing 多线程加载图片（保证顺序一致）

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