从零开始写JavaWeb框架(第一章节)
Posted 虚极静笃
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买了本《从零开始写JavaWeb框架》
因为是第一次用IDEA,期间遇到很多问题,比如:怎么在IDEA中配置tomcat:
在IDEA界面的右上角点击:
点击+,选择Maven
到了如下界面:
在Name中输入tomcat,在Command line中输入tomcat7:run,然后点击apply。
然后就可以运行了。
第一章节如下:
pom.xml
<?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.smart4j</groupId> <artifactId>chapter1</artifactId> <version>1.0.0</version> <packaging>war</packaging> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> </properties> <dependencies> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>jsp-api</artifactId> <version>2.2</version> <scope>provided</scope> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> <scope>runtime</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.3</version> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-surefire-plugin</artifactId> <version>2.18.1</version> <configuration> <skipTests>true</skipTests> </configuration> </plugin> <plugin> <groupId>org.apache.tomcat.maven</groupId> <artifactId>tomcat7-maven-plugin</artifactId> <version>2.2</version> <configuration> <path>/${project.artifactId}</path> </configuration> </plugin> </plugins> </build> </project>
web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0"> </web-app>
HelloServlet.java
package org.smart4j.chapter1; /** * Created by sahara on 2016/3/13. */ import java.io.IOException; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Date; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @WebServlet("/hello") public class HelloServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { DateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String currentTime = dateFormat.format(new Date()); req.setAttribute("currentTime", currentTime); req.getRequestDispatcher("/WEB-INF/jsp/hello.jsp").forward(req, resp); } }
hello.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Hello</title> </head> <body> <h1>${currentTime}</h1> </body> </html>
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