playwright-java 的 Browser、BrowserContext、Page 挺好理解的，唯独这厮，就有一丢丢 ……
package com.microsoft.playwright;/*** BrowserType provides methods to launch a specific browser instance or connect to an existing one. ** BrowserType 提供启动一个特定浏览器或连接到一个已存在浏览器的方法。*/
public interface BrowserType {// 启动浏览器 返回浏览器实例Browser launch(LaunchOptions options);// 通过 Chrome DevTools Protocol 连接已存在的浏览器 Browser connectOverCDP(String endpointURL, ConnectOverCDPOptions options);// 返回浏览器名 例如 chromium webkit firefoxString name();// 返回可执行的浏览器路径String executablePath();// ...}
调试以下代码，可看出：
BrowserType 不是简单直译地表示浏览器类型，而是表示带有浏览器类型和浏览器可执行路径，用来启动或连接已启动浏览器的类。
package demo;
import com.microsoft.playwright.*;import java.util.Arrays;
import java.util.List;public class Demo {public static void main(String[] args) {try(Playwright playwright = Playwright.create()) {// 三个 BrowserTypeList<BrowserType> browserTypes = Arrays.asList(playwright.chromium(),playwright.webkit(),playwright.firefox());BrowserType.LaunchOptions launchOptions = new BrowserType.LaunchOptions().setHeadless(false);// 遍历for (BrowserType browserType : browserTypes) {// 启动浏览器try (Browser browser = browserType.launch(launchOptions)) {BrowserContext context = browser.newContext();Page page = context.newPage();page.navigate("https://localhost/");}}}}
}
好了，那上图的 initializer 从何而来？又要到哪里去？
一条重要的线索，渐渐浮出水面 ……
翻过这座山，越过那片海；给下面的方法都加断点，相信，上下而求索的你，终将找到真相 ……
- com.microsoft.playwright.impl.PlaywrightImpl#createImpl
- com.microsoft.playwright.impl.ReaderThread#run
- com.microsoft.playwright.impl.ChannelOwner#runUntil
- com.microsoft.playwright.impl.Connection#processOneMessage
- com.microsoft.playwright.impl.Connection#createRemoteObject
- com.microsoft.playwright.impl.PlaywrightImpl#PlaywrightImpl
Huajianketang would climb every mountain, and swim every ocean, just to find you.
