聊聊如何解析pom文件

本文介绍了如何使用Maven的maven-model库解析POM文件,详细解读了Model和ModelBase类,展示了POM文件中的关键元素如groupId、artifactId等及其用途。

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本文主要研究一下如何解析pom文件

maven-model

maven提供了maven-model的类库可以直接解析

		<dependency>
			<groupId>org.apache.maven</groupId>
			<artifactId>maven-model</artifactId>
			<version>3.9.4</version>
		</dependency>

使用

        MavenXpp3Reader xpp3Reader = new MavenXpp3Reader();
        Model model = xpp3Reader.read(new ByteArrayInputStream(data));
        Properties properties = model.getProperties();

使用MavenXpp3Reader可以直接读取pom文件,之后就可以得到Model

Model

maven-model-3.9.4-sources.jar!/org/apache/maven/model/Model.java

public class Model extends ModelBase implements Serializable, Cloneable {
    private String modelVersion;
    private Parent parent;
    private String groupId;
    private String artifactId;
    private String version;
    private String packaging = "jar";
    private String name;
    private String description;
    private String url;
    private String childProjectUrlInheritAppendPath;
    private String inceptionYear;
    private Organization organization;
    private List<License> licenses;
    private List<Developer> developers;
    private List<Contributor> contributors;
    private List<MailingList> mailingLists;
    private Prerequisites prerequisites;
    private Scm scm;
    private IssueManagement issueManagement;
    private CiManagement ciManagement;
    private Build build;
    private List<Profile> profiles;
    private String modelEncoding = "UTF-8";
    private File pomFile;

    //......
}    

Model继承了ModelBase

ModelBase

maven-model-3.9.4-sources.jar!/org/apache/maven/model/ModelBase.java

public class ModelBase implements Serializable, Cloneable, InputLocationTracker {
    private List<String> modules;
    private DistributionManagement distributionManagement;
    private Properties properties;
    private DependencyManagement dependencyManagement;
    private List<Dependency> dependencies;
    private List<Repository> repositories;
    private List<Repository> pluginRepositories;
    private Object reports;
    private Reporting reporting;
    private Map<Object, InputLocation> locations;
    private InputLocation location;
    private InputLocation modulesLocation;
    private InputLocation distributionManagementLocation;
    private InputLocation propertiesLocation;
    private InputLocation dependencyManagementLocation;
    private InputLocation dependenciesLocation;
    private InputLocation repositoriesLocation;
    private InputLocation pluginRepositoriesLocation;
    private InputLocation reportsLocation;
    private InputLocation reportingLocation;

    //......
}    

ModelBase定义了诸如properties、dependencyManagement、dependencies等

小结

maven提供了maven-model可以直接解析pom,它内置了对pom文件的model,可以用来快速分析依赖等。

### Java WebSocket 实现一对一聊天功能 为了实现Java中的WebSocket一对一聊天功能,可以采用Spring Boot框架来简化开发过程。下面介绍具体的方法。 #### Maven依赖设置 首先,在`pom.xml`文件中加入必要的依赖项以支持WebSocket协议: ```xml <dependencies> <!-- webSocket的依赖 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-websocket</artifactId> <version>2.7.12</version> </dependency> </dependencies> ``` 此部分确保了项目具备处理WebSocket消息的能力[^5]。 #### 配置WebSocket 创建一个配置类用于启动WebSocket服务并定义URL路径映射规则: ```java @Configuration @EnableWebSocket public class WebSocketConfig implements WebSocketConfigurer { @Override public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) { registry.addHandler(new ChatWebSocketHandler(), "/chat").setAllowedOrigins("*"); } } ``` 这段代码设置了WebSocket处理器与特定端点之间的关联关系,并开放跨域访问权限。 #### 创建WebSocket处理器 编写自定义的消息处理器继承于`TextWebSocketHandler`,负责接收来自客户端的信息并向指定目标发送回复: ```java @Component public class ChatWebSocketHandler extends TextWebSocketHandler { private final Map<String, WebSocketSession> sessions = new ConcurrentHashMap<>(); @Override protected void handleTextMessage(WebSocketSession session, TextMessage message) throws Exception { String payload = message.getPayload(); // 解析JSON格式的消息体获取sender和receiver信息 JSONObject jsonMsg = JSON.parseObject(payload); String sender = jsonMsg.getString("from"); String receiver = jsonMsg.getString("to"); // 存储当前会话或查找对应收件人的会话对象 if (!sessions.containsKey(sender)) { sessions.put(sender, session); } // 向对方发送消息 if (sessions.containsKey(receiver)) { WebSocketSession toUserSession = sessions.get(receiver); synchronized(toUserSession){ if(toUserSession.isOpen()){ toUserSession.sendMessage(message); }else{ System.out.println("The target user&#39;s connection is closed."); } } } else { System.out.println("Target user not found online."); } } @Override public void afterConnectionClosed(WebSocketSession session, CloseStatus status) throws Exception { super.afterConnectionClosed(session, status); Iterator<Map.Entry<String, WebSocketSession>> it = sessions.entrySet().iterator(); while(it.hasNext()) { Map.Entry<String, WebSocketSession> entry = it.next(); if(entry.getValue() == session) { it.remove(); // 移除离线用户的记录 } } } } ``` 上述逻辑实现了基本的一对一聊天室机制,其中包含了用户上线/下线管理以及私信转发等功能[^2]。 #### 前端页面集成 最后,在HTML页面上利用JavaScript API发起WebSocket连接并与服务器交互: ```javascript let socket; function connect(event) { const username = document.getElementById(&#39;username&#39;).value; let wsStart = &#39;ws://localhost:8080/chat&#39;; socket = new WebSocket(wsStart); socket.onmessage = function(event) { let messages = document.getElementById(&#39;messages&#39;); let message = document.createElement(&#39;div&#39;); message.textContent = event.data; messages.appendChild(message); }; socket.onopen = function(event) { console.log(&#39;Connected!&#39;); }; } function sendMessage(event) { let inputField = document.getElementById(&#39;text_message&#39;); let msgContent = { from : document.getElementById(&#39;username&#39;).value, to : document.getElementById(&#39;target_user&#39;).value, content : inputField.value }; socket.send(JSON.stringify(msgContent)); inputField.value = &#39;&#39;; } ``` 以上就是完整的Java WebSocket单聊应用实例说明[^1]。
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