Servlet3.0异步请求

• Z时代
• 2024-01-10
• 分类：综合

工程目录结构

MyServletContainerInitializer.class

public class MyServletContainerInitializer implements ServletContainerInitializer {
    public void onStartup(Set<Class<?>> set, ServletContext servletContext) throws ServletException {
    }
}

HelloAsynServlet.class

@WebServlet(value = "/async", asyncSupported = true)
public class HelloAsynServlet extends HttpServlet {
    @Override
    protected void doGet(final HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1. 支持异步处理asyncSupported = true
        //2. 开启异步模式
        //3. 业务逻辑进行异步处理
        System.out.println("主线程开始..........." + Thread.currentThread());
        final AsyncContext startAsync = req.startAsync();
        startAsync.start(new Runnable() {
            public void run() {
                try {
                    System.out.println("副线程开始..........." + Thread.currentThread());
                    say();
                    startAsync.complete();
                    //4. 获取到异步上下文
                    ServletResponse response = startAsync.getResponse();
                    response.getWriter().write("async Hello");
                    System.out.println("副线程结束..........." + Thread.currentThread());
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
        System.out.println("主线程结束..........." + Thread.currentThread());
    }
    private void say() throws Exception {
        System.out.println(Thread.currentThread() + "processing........");
        Thread.sleep(3000);
    }
}

javax.servlet.ServletContainerInitializer

com.lun.servlet.MyServletContainerInitializer

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.lun</groupId>
    <artifactId>servlet</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>
    <dependencies>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>
    <repositories>
        <repository>
            <id>nexus-aliyun</id>
            <name>Nexus aliyun</name>
            <layout>default</layout>
            <url>http://maven.aliyun.com/nexus/content/groups/public</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
            <releases>
                <enabled>true</enabled>
            </releases>
        </repository>
        <repository>
            <id>jboss-repository</id>
            <name>Jboss Repository for Maven</name>
            <url>http://repository.jboss.org/maven2</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
            <layout>default</layout>
        </repository>
    </repositories>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.6</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.6.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.ServletContainerInitializer</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>
</project>

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