Servlet快速入门

Love The Way You Lie 2024-03-30 10:04 49阅读 0赞

## Servlet快速入门 ##

### 概述 ###

**简介**：Servlet简单的讲就是Java的一门动态`Web`资源开发的技术,是JavaWeb的核心，是Javaee的规范之一，本质上就是一个封装好了的接口。

![在这里插入图片描述][e717e473340c4793bcd1a974c3a33432.png]

### 快速入门 ###

**创建顺序**  
![在这里插入图片描述][eb307e3500b1470ebf202cd37b323405.png]  
![在这里插入图片描述][2b986694600d4411b03ecefedc594782.png]  
![在这里插入图片描述][dfead3fb9e234e04b5fb25fce9326a52.png]  
![在这里插入图片描述][c4f7b0ba9ba74ef6a0c1f11c1e369522.png]

#### 创建项目 ####

**详情看我这篇文章**：[IDEA2022如何创建web项目  
][IDEA2022_web_]

#### 文件结构 ####

![在这里插入图片描述][e3dddd74f5de41af805854ca66dd498e.png]

#### 配置文件 ####

<?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.example</groupId>
        <artifactId>web-demo</artifactId>
        <version>1.0-SNAPSHOT</version>
        <packaging>war</packaging>
        <properties>
            <maven.compiler.source>8</maven.compiler.source>
            <maven.compiler.target>8</maven.compiler.target>
        </properties>
    
    
        <dependencies>
            <dependency>
                <groupId>javax.servlet</groupId>
                <artifactId>javax.servlet-api</artifactId>
                <version>3.1.0</version>
                <scope>provided</scope>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                
                <plugin>
                    <groupId>org.apache.tomcat.maven</groupId>
                    <artifactId>tomcat7-maven-plugin</artifactId>
                    <version>2.2</version>
                </plugin>
            </plugins>
        </build>
    </project>

#### Servlet部分 ####

import javax.servlet.*;
    import javax.servlet.annotation.WebServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    import java.io.PrintWriter;
    
    @WebServlet("/login")
    public class ServletDemo implements Servlet {
        
    
        @Override
        public void init(ServletConfig servletConfig) throws ServletException {
        
    
        }
    
        @Override
        public ServletConfig getServletConfig() {
        
            return null;
        }
    
        @Override
        public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
        
            HttpServletRequest request = (HttpServletRequest) servletRequest;
            HttpServletResponse response = (HttpServletResponse) servletResponse;
            // 获取参数username
            String username = request.getParameter("username");
            // 设置字符集
            response.setContentType("text/html;charset=utf-8");
    
            // 设置打印在网页上
            PrintWriter writer = response.getWriter();
            if ("zhangsan".equals(username)){
        
                writer.write("张三，欢迎你");
            } else if ("lisi".equals(username)){
        
                writer.write("李四，欢迎你");
            } else {
        
                writer.write("没有这个人");
            }
    
        }
    
        @Override
        public String getServletInfo() {
        
            return null;
        }
    
        @Override
        public void destroy() {
        
    
        }
    }

#### 运行结果 ####

![在这里插入图片描述][633df8ba51874a4c9a685300779fa82c.png]  
![在这里插入图片描述][71ff77871b40452f882fcccd4f47fc8e.png]  
![在这里插入图片描述][4332c29c7b754e63be6915c4918b3145.png]

[e717e473340c4793bcd1a974c3a33432.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/4c06caa212dc4d37937134a4970b11e0.png
[eb307e3500b1470ebf202cd37b323405.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/dcd41552b9044a2497e31266e7fce9d6.png
[2b986694600d4411b03ecefedc594782.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/12014d583ae14e398644b2b8dfe1d9e8.png
[dfead3fb9e234e04b5fb25fce9326a52.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/c4744e433bbe4852acec3a3db9b40d9e.png
[c4f7b0ba9ba74ef6a0c1f11c1e369522.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/77ada53ff91043fb86364283a1161ea0.png
[IDEA2022_web_]: https://blog.csdn.net/qq_51447496/article/details/128355084?spm=1001.2014.3001.5501
[e3dddd74f5de41af805854ca66dd498e.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/957b0bd5cdde41e3b8664a02e9eb6ff8.png
[633df8ba51874a4c9a685300779fa82c.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/8e5f9ffe14c84e17944df9454eef0a78.png
[71ff77871b40452f882fcccd4f47fc8e.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/3616d9b19f704adab604631ff5867842.png
[4332c29c7b754e63be6915c4918b3145.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/30/50aafb645901413c9a5fee5bd5998cbd.png