依赖
使用 idea 新创建一个 maven 项目, 不要选择任何模板, 在 pom.xml 中添加下列依赖:
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| <packaging>war</packaging>
<properties>
<jsp-version>2.3.3</jsp-version>
<servlet-version>4.0.1</servlet-version>
</properties>
<dependencies>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>javax.servlet.jsp-api</artifactId>
<version>${jsp-version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>${servlet-version}</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.2</version>
<configuration>
<path>/</path>
<port>8090</port>
<server>tomcat7</server>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>run</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
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注意, 这里一定要把 packaging 改成 war
目录路径
在 src/main 目录下新建一个 webapp/WEB-INF 文件夹, 新建一个 web.xml, 内容是:
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| <?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>hello</servlet-name>
<servlet-class>Hello</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>hello</servlet-name>
<url-pattern>/hello</url-pattern>
</servlet-mapping>
</web-app>
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新建一个servlet
在 src/main/java 路径下新建一个 Hello.java, 内容是:
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| import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
public class Hello extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
PrintWriter printWriter = resp.getWriter();
printWriter.println("hello");
}
}
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测试
访问 http://localhost:8090/hello, 就可以看到 hello 字样了。