Java使用JCEF开发 windows桌面应用

2024-01-18 08:32:30 浏览数 (1)

一、写在前面 以前写windows桌面应用首选用C#,当然是最好用的解决方案之一。这些年用java,才发现着实费劲,最近这些年随着硬件的能力提升,使用H5开发各种移动应用,桌面应用的方法也逐渐变得可行。本文记载了我用JCEF开发windows桌面应用的一种方法。

先了解一些:

CEF是什么? Chromium Embedded Framework (CEF)是个基于Google Chromium项目的开源Web browser控件,支持Windows, Linux, Mac平台。除了提供C/C 接口外,也有其他语言的移植版。因为基于Chromium,所以CEF支持 Webkit & Chrome中实现的 HTML5 的特性,并且在性能上面,也比较接近Chrome。

JCEF是什么?它是 CEF 在Java语言的实现。它基于 Chromium 嵌入式框架 (CEF),允许您将 Web 浏览器嵌入到 Java Swing 桌面应用程序中。

也就是说我的方式是: 1、写一个Java应用,集成JCEF 做界面,进行UI交互。前端用VUE.js实现。 2、在这个应用中集成 Springboot 做业务处理集成。 3、打出的jar 启动后,即启动一个内嵌的浏览器,展示界面,同时也是Java 程序。

二、使用 简单省事的方式是使用maven 来集成. GITHUB: https://github.com/jcefmaven/jcefmaven

代码语言:javascript复制
        <dependency>
            <groupId>me.friwi</groupId>
            <artifactId>jcefmaven</artifactId>
            <version>116.0.19</version>
        </dependency>

代码示例:

代码语言:javascript复制
package org.example;

import me.friwi.jcefmaven.CefAppBuilder;
import me.friwi.jcefmaven.CefInitializationException;
import me.friwi.jcefmaven.MavenCefAppHandlerAdapter;
import me.friwi.jcefmaven.UnsupportedPlatformException;
import org.cef.CefApp;
import org.cef.CefClient;
import org.cef.browser.CefBrowser;
import org.cef.browser.CefFrame;
import org.cef.browser.CefMessageRouter;
import org.cef.handler.CefDisplayHandlerAdapter;
import org.cef.handler.CefFocusHandlerAdapter;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.IOException;

public class MainFrame extends JFrame {
    private static final long serialVersionUID = -5570653778104813836L;
    private final JTextField address_;
    private final CefApp cefApp_;
    private final CefClient client_;
    private final CefBrowser browser_;
    private final Component browerUI_;
    private boolean browserFocus_ = true;

    MainFrame(String startURL, boolean useOSR, boolean isTransparent, String[] args) throws UnsupportedPlatformException, CefInitializationException, IOException, InterruptedException {
        CefAppBuilder builder = new CefAppBuilder();
        builder.getCefSettings().windowless_rendering_enabled = useOSR;
        builder.setAppHandler(new MavenCefAppHandlerAdapter() {
            @Override
            public void stateHasChanged(org.cef.CefApp.CefAppState state) {
                 if (state == CefApp.CefAppState.TERMINATED) System.exit(0);
            }
        });
        if (args.length > 0) {
            builder.addJcefArgs(args);
        }
        cefApp_ = builder.build();
        client_ = cefApp_.createClient();
         CefMessageRouter msgRouter = CefMessageRouter.create();
        client_.addMessageRouter(msgRouter);
        browser_ = client_.createBrowser(startURL, useOSR, isTransparent);

        browerUI_ = browser_.getUIComponent();
        address_ = new JTextField(startURL, 100);
        address_.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                browser_.loadURL(address_.getText());
            }
        });

         client_.addDisplayHandler(new CefDisplayHandlerAdapter() {
            @Override
            public void onAddressChange(CefBrowser browser, CefFrame frame, String url) {
                address_.setText(url);
            }
        });

         address_.addFocusListener(new FocusAdapter() {
            @Override
            public void focusGained(FocusEvent e) {
                if (!browserFocus_) return;
                browserFocus_ = false;
                KeyboardFocusManager.getCurrentKeyboardFocusManager().clearGlobalFocusOwner();
                address_.requestFocus();
            }
        });
        client_.addFocusHandler(new CefFocusHandlerAdapter() {
            @Override
            public void onGotFocus(CefBrowser browser) {
                if (browserFocus_) return;
                browserFocus_ = true;
                KeyboardFocusManager.getCurrentKeyboardFocusManager().clearGlobalFocusOwner();
                browser.setFocus(true);
            }

            @Override
            public void onTakeFocus(CefBrowser browser, boolean next) {
                browserFocus_ = false;
            }
        });
        getContentPane().add(address_, BorderLayout.NORTH);
         getContentPane().add(browerUI_, BorderLayout.CENTER);
        pack();
        setTitle("我的工具");

        setSize(1400, 800);
        setLocationRelativeTo(null);
        setVisible(true);
        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                CefApp.getInstance().dispose();
                dispose();
            }
        });
    }

    public static void main(String[] args) throws UnsupportedPlatformException, CefInitializationException, IOException, InterruptedException {
         boolean useOsr = false;
        new MainFrame("http://www.baidu.com/", useOsr, false, args);
    }
}

启动应用后,会展示一个浏览器窗口

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