maven工程servlet实例之导入项目依赖的jar包与maven工程servlet实例之jar包冲突解决

maven工程servlet实例之导入项目依赖的jar包

添加jar包的坐标时，还可以指定这个jar包将来的作用范围。

每个maven工程都需要定义本工程的坐标，坐标是maven对jar包的身份定义，比如：入门程序的坐标定义如下：

<!--项目名称，定义为组织名+项目名，类似包名--> 
<groupId>com.itheima</groupId> 
    <!-- 模块名称 -->
<artifactId>hello_maven</artifactId>
<!-- 当前项目版本号，snapshot为快照版本即非正式版本，release为正式发布版本 --> 
<version>0.0.1-SNAPSHOT</version>

package hf.xueqiang.Servlet;

import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;public class ServletDemo extends HttpServlet {


    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doGet(request,response);
    }

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.getRequestDispatcher("hello.jsp").forward(request,response);
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
        <servlet>
            <servlet-name>servletDemo</servlet-name>
            <servlet-class>hf.xueqiang.Servlet.ServletDemo</servlet-class>
        </servlet>
        <servlet-mapping>
            <servlet-name>servletDemo</servlet-name>
            <url-pattern>/maven</url-pattern>
        </servlet-mapping>
</web-app>

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>hf.xueqiang</groupId>
    <artifactId>day23_Maven</artifactId>
    <version>1.0-SNAPSHOT</version>
    <name>day23_Maven</name>
    <packaging>war</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.target>1.8</maven.compiler.target>
        <maven.compiler.source>1.8</maven.compiler.source>
        <junit.version>5.8.2</junit.version>
    </properties>


    <dependencies>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-web-api</artifactId>
            <version>8.0.1</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
            <version>${junit.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-engine</artifactId>
            <version>${junit.version}</version>
            <scope>test</scope>
        </dependency>
        <!--放置都都是项目运行所依赖的jar包-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.2</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>3.3.2</version>
            </plugin>

        </plugins>

    </build>
</project>