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 firefox
String 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 BrowserType
List<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.
