Eclipse中创建maven项目步骤

一：流程分解
1.eclipse中创建maven项目
2.在pom.xml文件中增加jre和tomcat的相关jar包
3.设置maven的命令，用maven来执行tomcat
4.浏览器访问

二：演示
1.eclipse中创建maven项目

2.在pom.xml文件中增加jre和tomcat的相关jar包

<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>com.guojian</groupId>
  <artifactId>webproject</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <failOnMissingWebXml>false</failOnMissingWebXml>
  </properties>

    <dependencies>
    <!-- Servlet API -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
    </dependency>
  </dependencies>

  <build>
    <sourceDirectory>src/main/java</sourceDirectory>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.5.1</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>

      <!-- Embedded Apache Tomcat required for testing war -->

      <plugin>
        <groupId>org.apache.tomcat.maven</groupId>
        <artifactId>tomcat7-maven-plugin</artifactId>
        <version>2.2</version>
        <configuration>
          <path>/</path>
        </configuration>
      </plugin>
    </plugins>
  </build>

</project>

3.设置maven的命令，用maven来执行tomcat

3.1、在src/maim/java下新建一个包servlet和该包下新建一个类HelloWorldServlet。

package servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author maxsu
 */
@WebServlet("/hello")
public class HelloWorldServlet extends HttpServlet {

    private static final long serialVersionUID = 1L;

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/plain");
        resp.getWriter().write("Hello World! Maven Web Project Example.");
    }
}

3.2、右键项目名–>Run As–>Maven build..–>clean install

正常时：

有可能报错：Dmaven.multiModuleProjectDirectory system property is not set.
这个需要maven环境变量配置M2_Home和配置JRE时需要引入这个环境变量。
-Dmaven.multiModuleProjectDirectory=$M2_HOME

3.3 运行在tomcat上：右键项目名–>Run As–>Maven build..–>tomcat7:run

正常时显示:

4.浏览器访问
http://localhost:8080/hello