使用Java创建集成JACOB的HTTP服务

程序浅谈 后端 2024-09-09

使用Java创建集成JACOB的HTTP服务

背景介绍

在Windows环境中,Java应用有时需要与Windows的COM组件进行交互。JACOB(Java COM Bridge)提供了一个桥梁,使得Java可以调用Windows的COM对象。本文将介绍如何创建一个Java HTTP服务,并集成JACOB来与Windows系统交互。

1、环境配置

首先,确保你已经安装了JDK和Maven。接着,在你的Maven项目的pom.xml文件中添加JACOB依赖:pom.xml

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<dependency> <groupId>com.hynnet</groupId> <artifactId>jacob</artifactId> <version>1.18</version> </dependency>

这将自动下载JACOB库,并将其添加到你的项目中。

2、创建集成JACOB的HTTP服务

2.1 动态加载JACOB DLL

使用Java创建集成JACOB的HTTP服务

JACOB库需要用到DLL文件。我们将从资源中提取DLL文件,并动态加载它。以下代码展示了如何提取DLL并设置系统属性:java

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private static String extractDll(String dllFileName) throws IOException { InputStream dllStream = WindowsClient.class.getResourceAsStream("/lib/" + dllFileName); if (dllStream == null) { log.error("DLL 文件不存在: " + dllFileName); throw new IOException("DLL 文件不存在: " + dllFileName); } File tempDll = Files.createTempFile("jacob", ".dll").toFile(); tempDll.deleteOnExit(); try (FileOutputStream fos = new FileOutputStream(tempDll)) { byte[] buffer = new byte[1024]; int bytesRead; while ((bytesRead = dllStream.read(buffer)) != -1) { fos.write(buffer, 0, bytesRead); } } return tempDll.getAbsolutePath(); }

在main方法中,调用extractDll方法提取DLL,并通过LibraryLoader类动态加载DLL:java

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public static void main(String[] args) throws IOException { String dllPath = extractDll("jacob-1.18-x64.dll"); System.setProperty(LibraryLoader.JACOB_DLL_PATH, dllPath); LibraryLoader.loadJacobLibrary(); // 继续后续步骤 }
2.2 创建并配置HTTP服务器

使用Java的HttpServer类创建一个简单的HTTP服务。服务器将监听指定的端口,并定义请求处理器:java

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int clientPort = 10005; InetAddress localHost = InetAddress.getLocalHost(); String hostAddress = localHost.getHostAddress(); log.info("客户端启动,监听端口 " + clientPort); log.info("访问地址: http://" + hostAddress + ":" + clientPort + "/receive"); HttpServer server = HttpServer.create(new InetSocketAddress(clientPort), 0); server.createContext("/receive", new ReceiveHandler()); server.setExecutor(Executors.newCachedThreadPool()); server.start();
2.3 实现IP白名单java
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private static final Set<String> WHITELIST = new HashSet<>(); static { WHITELIST.add("127.0.0.1"); WHITELIST.add("20.47.122.28"); } static class ReceiveHandler implements HttpHandler { @Override public void handle(HttpExchange exchange) throws IOException { String remoteAddress = exchange.getRemoteAddress().getAddress().getHostAddress(); log.info("收到来自 " + remoteAddress + " 的请求"); if (!WHITELIST.contains(remoteAddress)) { String response = "403 Forbidden - 您的IP地址不在白名单中"; exchange.sendResponseHeaders(403, response.getBytes().length); exchange.getResponseBody().write(response.getBytes()); exchange.getResponseBody().close(); log.info("拒绝访问: " + remoteAddress); return; } // 继续处理请求 } }
2.4 处理HTTP请求

在ReceiveHandler中处理HTTP请求,包括记录日志和响应请求。以下是如何读取请求体并处理消息的代码示例:ini

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@Override public void handle(HttpExchange exchange) throws IOException { String remoteAddress = exchange.getRemoteAddress().getAddress().getHostAddress(); log.info("收到来自 " + remoteAddress + " 的请求"); if (!WHITELIST.contains(remoteAddress)) { String response = "403 Forbidden - 您的IP地址不在白名单中"; exchange.sendResponseHeaders(403, response.getBytes().length); exchange.getResponseBody().write(response.getBytes()); exchange.getResponseBody().close(); log.info("拒绝访问: " + remoteAddress); return; } InputStream is = exchange.getRequestBody(); byte[] bytes = readAllBytes(is); String message = new String(bytes, StandardCharsets.UTF_8); log.info("接收到的消息: " + message); String response = "消息已接收并处理"; exchange.sendResponseHeaders(200, response.getBytes().length); exchange.getResponseBody().write(response.getBytes()); exchange.getResponseBody().close(); } private byte[] readAllBytes(InputStream is) throws IOException { ByteArrayOutputStream buffer = new ByteArrayOutputStream(); byte[] data = new byte[1024]; int bytesRead; while ((bytesRead = is.read(data, 0, data.length)) != -1) { buffer.write(data, 0, bytesRead); } return buffer.toByteArray(); }

3、总结

本文介绍了如何在Java中创建一个集成JACOB的HTTP服务。我们详细讲解了动态加载JACOB DLL、创建和配置HTTP服务器、实现IP白名单以及处理HTTP请求的具体实现步骤。通过这些步骤,你可以在Java应用中调用Windows的COM组件,并通过HTTP接口与外部系统进行交互。

转载来源:https://juejin.cn/post/7410097732185686031

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