search
HomeJavajavaTutorialHow to use Servlet in SpringBoot

How to use Servlet in SpringBoot

May 10, 2023 pm 05:22 PM
servletspringboot

1. Method 1 (using annotations)

First, we write a Servlet. The requirement is to simply print a sentence.

Use the @WebServlet annotation above the MyServlet class to create a Servlet.

package com.songzihao.springboot.servlet;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
 
/**
 *
 */
@WebServlet(urlPatterns = "/myservlet")
public class MyServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().println("My SpringBoot Servlet-1");
        resp.getWriter().flush();
        resp.getWriter().close();
    }
 
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

Then use the annotation @ServletComponentScan annotation above the entry class of the SpringBoot project to scan the annotations in the Servlet.

package com.songzihao.springboot;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
 
@SpringBootApplication //开启spring配置
@ServletComponentScan(basePackages = "com.songzihao.springboot.servlet")
public class Application {
 
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

Finally start the test.

How to use Servlet in SpringBoot

#2. Method 2 (define configuration class)

Still write a Servlet first. No annotations are used this time.

package com.songzihao.springboot.servlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
 
/**
 *
 */
public class MyServlet extends HttpServlet {
 
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().println("My SpringBoot Servlet-2");
        resp.getWriter().flush();
        resp.getWriter().close();
    }
 
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}

Then write a configuration class! ! !

The @Configuration annotation is used above this class. The table name of this class is a configuration class, which is equivalent to various previous xml configuration files.

Use the @Bean annotation above the method in the class. ServletRegistrationBean is equivalent to a Servlet registration class, similar to the previous and tags.

package com.songzihao.springboot.config;
import com.songzihao.springboot.servlet.MyServlet;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
/**
 *
 */
@Configuration //该注解将此类定义为一个配置类(相当于一个xml配置文件)
public class ServletConfig {
 
    /**
     * @Bean 是一个方法级别上的注解,主要用在配置类里
     * 相当于一个 <beans>
     *              <bean id="..." class="..." />
     *          </beans>
     * @return
     */
    @Bean
    public ServletRegistrationBean myServletRegistrationBean() {
        ServletRegistrationBean servletRegistrationBean=new ServletRegistrationBean(
                new MyServlet(),"/myservlet"
        );
        return servletRegistrationBean;
    }
}

Finally start the test.

package com.songzihao.springboot;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
 
@SpringBootApplication
public class Application {
 
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

How to use Servlet in SpringBoot

The above is the detailed content of How to use Servlet in SpringBoot. For more information, please follow other related articles on the PHP Chinese website!

Statement
This article is reproduced at:亿速云. If there is any infringement, please contact admin@php.cn delete
How does the JVM handle differences in operating system APIs?How does the JVM handle differences in operating system APIs?Apr 27, 2025 am 12:18 AM

JVM handles operating system API differences through JavaNativeInterface (JNI) and Java standard library: 1. JNI allows Java code to call local code and directly interact with the operating system API. 2. The Java standard library provides a unified API, which is internally mapped to different operating system APIs to ensure that the code runs across platforms.

How does the modularity introduced in Java 9 impact platform independence?How does the modularity introduced in Java 9 impact platform independence?Apr 27, 2025 am 12:15 AM

modularitydoesnotdirectlyaffectJava'splatformindependence.Java'splatformindependenceismaintainedbytheJVM,butmodularityinfluencesapplicationstructureandmanagement,indirectlyimpactingplatformindependence.1)Deploymentanddistributionbecomemoreefficientwi

What is bytecode, and how does it relate to Java's platform independence?What is bytecode, and how does it relate to Java's platform independence?Apr 27, 2025 am 12:06 AM

BytecodeinJavaistheintermediaterepresentationthatenablesplatformindependence.1)Javacodeiscompiledintobytecodestoredin.classfiles.2)TheJVMinterpretsorcompilesthisbytecodeintomachinecodeatruntime,allowingthesamebytecodetorunonanydevicewithaJVM,thusfulf

Why is Java considered a platform-independent language?Why is Java considered a platform-independent language?Apr 27, 2025 am 12:03 AM

JavaachievesplatformindependencethroughtheJavaVirtualMachine(JVM),whichexecutesbytecodeonanydevicewithaJVM.1)Javacodeiscompiledintobytecode.2)TheJVMinterpretsandexecutesthisbytecodeintomachine-specificinstructions,allowingthesamecodetorunondifferentp

How can graphical user interfaces (GUIs) present challenges for platform independence in Java?How can graphical user interfaces (GUIs) present challenges for platform independence in Java?Apr 27, 2025 am 12:02 AM

Platform independence in JavaGUI development faces challenges, but can be dealt with by using Swing, JavaFX, unifying appearance, performance optimization, third-party libraries and cross-platform testing. JavaGUI development relies on AWT and Swing, which aims to provide cross-platform consistency, but the actual effect varies from operating system to operating system. Solutions include: 1) using Swing and JavaFX as GUI toolkits; 2) Unify the appearance through UIManager.setLookAndFeel(); 3) Optimize performance to suit different platforms; 4) using third-party libraries such as ApachePivot or SWT; 5) conduct cross-platform testing to ensure consistency.

What aspects of Java development are platform-dependent?What aspects of Java development are platform-dependent?Apr 26, 2025 am 12:19 AM

Javadevelopmentisnotentirelyplatform-independentduetoseveralfactors.1)JVMvariationsaffectperformanceandbehavioracrossdifferentOS.2)NativelibrariesviaJNIintroduceplatform-specificissues.3)Filepathsandsystempropertiesdifferbetweenplatforms.4)GUIapplica

Are there performance differences when running Java code on different platforms? Why?Are there performance differences when running Java code on different platforms? Why?Apr 26, 2025 am 12:15 AM

Java code will have performance differences when running on different platforms. 1) The implementation and optimization strategies of JVM are different, such as OracleJDK and OpenJDK. 2) The characteristics of the operating system, such as memory management and thread scheduling, will also affect performance. 3) Performance can be improved by selecting the appropriate JVM, adjusting JVM parameters and code optimization.

What are some limitations of Java's platform independence?What are some limitations of Java's platform independence?Apr 26, 2025 am 12:10 AM

Java'splatformindependencehaslimitationsincludingperformanceoverhead,versioncompatibilityissues,challengeswithnativelibraryintegration,platform-specificfeatures,andJVMinstallation/maintenance.Thesefactorscomplicatethe"writeonce,runanywhere"

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

PhpStorm Mac version

PhpStorm Mac version

The latest (2018.2.1) professional PHP integrated development tool

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

MinGW - Minimalist GNU for Windows

MinGW - Minimalist GNU for Windows

This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

MantisBT

MantisBT

Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function