248 lines
9.9 KiB
Markdown
248 lines
9.9 KiB
Markdown
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---
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title: springMvc整合undertow容器
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categories: 毕业设计
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date: 2023-02-09 10:39:24
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tags:
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- java
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- spring mvc
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- undertow
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---
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> 因为项目要求用springMvc，但是默认以war包发布到tomact下每一次启动都会很慢，所以希望能用一个嵌入式的web容器，了解到undertow对于小型项目还不错，就使用了undertow.
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> 最开始用的Jfinal-undertow，但是突然看到出了spring6.0，就想体验一下，spring6.0对应的servlet版本比较高，jfinal-undertow并不兼容，所以就自己找到了undertow进行使用，以下就是折腾的经历。
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# 1. 依赖安装
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```xml
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<!-- https://mvnrepository.com/artifact/io.undertow/undertow-servlet -->
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<dependency>
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<groupId>io.undertow</groupId>
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<artifactId>undertow-servlet</artifactId>
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<version>2.3.3.Final</version>
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</dependency>
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<!-- https://mvnrepository.com/artifact/io.undertow/undertow-core -->
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<dependency>
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<groupId>io.undertow</groupId>
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<artifactId>undertow-core</artifactId>
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<version>2.3.3.Final</version>
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</dependency>
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```
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在项目原本的依赖下加入以上两个依赖，版本需要对应一样，分别是undertow的核心依赖和undertow的servlet相关实现。
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# 2. 运行整合
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## 2.1 添加servlet
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```java
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// 创建servletInfo，指定servlet的命名和servlet对应的class
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ServletInfo info = new ServletInfo("mvc", DispatcherServlet.class)
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// 添加映射路径
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.addMapping("/")
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// 设置InitParam，制定了spring-mvc的配置文件位置
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.addInitParam("contextConfigLocation","classpath:spring-config/spring-mvc.xml")
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// 设置什么时候进行初始化
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.setLoadOnStartup(1);
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```
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## 2.2 创建容器
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undertow的一个web容器就是一个**DeploymentManager**，该接口的默认实现类就是**DeploymentManagerImpl**，然后需要两个参数，分别是**DeploymentInfo**和**ServletContainer**，所以需要先创建DeploymentInfo，然后创建ServletContainer，因为ServletContainer也需要DeploymentInfo作为参数，代码如下所示。
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```java
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// 创建DeploymentInfo 对象
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DeploymentInfo deploymentInfo = new DeploymentInfo()
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// 指定类加载器
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.setClassLoader(TestServer.class.getClassLoader())
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// 设置contextPath
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.setContextPath("/")
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// 设置容器名称
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.setDeploymentName("myUndertow")
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// 设置初始化参数，制定了spring的配置文件的位置
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.addInitParameter("contextConfigLocation","classpath:spring-config/spring.xml")
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// 设置了一个监听器，用于初始化spring
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.addListener(new ListenerInfo(ContextLoaderListener.class))
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// 添加servlet
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.addServlet(info)
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// 添加一个过滤器，放置乱码问题
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.addFilter(
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new FilterInfo("Encoding", CharacterEncodingFilter.class)
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.addInitParam("encoding","utf-8")
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);
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// 创建一个ServletContainer，并添加deploymentInfo
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ServletContainerImpl container = new ServletContainerImpl();
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container.addDeployment(deploymentInfo);
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// 创建一个DeploymentManagerImpl
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DeploymentManagerImpl manager = new DeploymentManagerImpl(deploymentInfo, container);
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// 部署该容器，一定要部署否则会报各种空指针
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manager.deploy();
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```
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## 2.3 添加HttpHandler
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因为是web项目，所以使用HttpHandler，HttpHandler默认有很多实现类，这里使用了最好理解的**PathHandler**，创建完之后添加到**Undertow**的Builder参数中，作为一个Listener,然后启动Undertow。
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```java
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// 创建一个PathHandler,然后添加一个前缀匹配，DeploymentManagerImpl 调用start方法后会返回一个HttpHandler类型
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PathHandler root = new PathHandler().addPrefixPath(deploymentInfo.getContextPath(), manager.start());
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// 创建一个Undertow对象并配置启动的端口等参数，然后调用start方法启动
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Undertow.Builder builder = Undertow.builder().addHttpListener(port, host, root);
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Undertow undertow = builder.build();
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undertow.start();
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logger.info(" the undertow success listen http://"+host+":"+port);
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```
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## 2.4 读取配置文件
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我也希望向springBoot项目一样可以直接读取端口等参数直接启动，但是因为容器运行时spring容器还没有运行，所以我才用的方法是手动读取文件并注入字段。
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```java
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public void initConfig(String configPath) throws IllegalAccessException {
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if (configPath.equals("")){
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configPath = "config/application.yml";
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}
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// 读取yaml文件并转换为propperties
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YamlPropertiesFactoryBean propertiesFactoryBean = new YamlPropertiesFactoryBean();
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propertiesFactoryBean.setResources(new ClassPathResource(configPath));
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// 配置log4j基本信息
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PropertyConfigurator.configure(propertiesFactoryBean.getObject());
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// 读取当前类的字段
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Field[] fields = this.getClass().getDeclaredFields();
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for (Field field:fields
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) {
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// 检查是否包含Value注解
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if (field.getAnnotation(Value.class) != null) {
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String value = field.getAnnotation(Value.class).value();
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value = value.substring(2).substring(0, value.length() - 3);
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// 注入参数
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field.set(this,propertiesFactoryBean.getObject().get(value));
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}
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}
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}
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@Value("${server.host}")
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public String host;
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@Value("${server.port}")
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public Integer port;
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```
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# 3. 最后
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完整代码如下
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```java
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package org.gjs;
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import io.undertow.Undertow;
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import io.undertow.server.handlers.PathHandler;
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import io.undertow.servlet.UndertowServletMessages;
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import io.undertow.servlet.api.DeploymentInfo;
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import io.undertow.servlet.api.FilterInfo;
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import io.undertow.servlet.api.ListenerInfo;
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import io.undertow.servlet.api.ServletInfo;
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import io.undertow.servlet.core.DeploymentImpl;
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import io.undertow.servlet.core.DeploymentManagerImpl;
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import io.undertow.servlet.core.ManagedServlet;
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import io.undertow.servlet.core.ServletContainerImpl;
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import io.undertow.servlet.handlers.ServletHandler;
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import io.undertow.servlet.handlers.ServletInitialHandler;
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import io.undertow.servlet.handlers.ServletPathMatches;
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import io.undertow.servlet.spec.ServletContextImpl;
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import jakarta.servlet.ServletException;
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import org.apache.log4j.Logger;
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import org.apache.log4j.PropertyConfigurator;
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import org.gjs.config.MyUndertowConfig;
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import org.springframework.beans.factory.annotation.Value;
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import org.springframework.beans.factory.config.YamlPropertiesFactoryBean;
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import org.springframework.core.io.ClassPathResource;
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import org.springframework.http.server.reactive.UndertowHttpHandlerAdapter;
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import org.springframework.web.context.ContextLoaderListener;
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import org.springframework.web.filter.CharacterEncodingFilter;
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import org.springframework.web.servlet.DispatcherServlet;
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import java.lang.reflect.Field;
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public class TestServer {
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private final Logger logger = Logger.getLogger(this.getClass());
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public static void main(String[] args) throws ServletException, IllegalAccessException {
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TestServer server = new TestServer();
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server.initConfig("");
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server.start();
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}
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public void initConfig(String configPath) throws IllegalAccessException {
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if (configPath.equals("")){
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configPath = "config/application.yml";
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}
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YamlPropertiesFactoryBean propertiesFactoryBean = new YamlPropertiesFactoryBean();
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propertiesFactoryBean.setResources(new ClassPathResource(configPath));
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// 配置log4j基本信息
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PropertyConfigurator.configure(propertiesFactoryBean.getObject());
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Field[] fields = this.getClass().getDeclaredFields();
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for (Field field:fields
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) {
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if (field.getAnnotation(Value.class) != null) {
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String value = field.getAnnotation(Value.class).value();
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value = value.substring(2).substring(0, value.length() - 3);
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field.set(this,propertiesFactoryBean.getObject().get(value));
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}
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}
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}
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@Value("${server.host}")
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public String host;
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@Value("${server.port}")
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public Integer port;
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public void start() throws ServletException {
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ServletInfo info = new ServletInfo("mvc", DispatcherServlet.class)
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.addMapping("/")
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.addInitParam("contextConfigLocation","classpath:spring-config/spring-mvc.xml")
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.setLoadOnStartup(1);
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DeploymentInfo deploymentInfo = new DeploymentInfo()
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.setClassLoader(TestServer.class.getClassLoader())
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.setContextPath("/")
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.setDeploymentName("myUndertow")
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.addInitParameter("contextConfigLocation","classpath:spring-config/spring.xml")
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.addListener(new ListenerInfo(ContextLoaderListener.class))
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.addServlet(info)
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.addFilter(
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new FilterInfo("Encoding", CharacterEncodingFilter.class)
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.addInitParam("encoding","utf-8")
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);
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ServletContainerImpl container = new ServletContainerImpl();
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container.addDeployment(deploymentInfo);
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DeploymentManagerImpl manager = new DeploymentManagerImpl(deploymentInfo, container);
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manager.deploy();
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PathHandler root = new PathHandler().addPrefixPath(deploymentInfo.getContextPath(), manager.start());
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Undertow.Builder builder = Undertow.builder().addHttpListener(port, host, root);
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Undertow undertow = builder.build();
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undertow.start();
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logger.info(" the undertow success listen http://"+host+":"+port);
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}
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}
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```
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