程序员最近都爱上了这个网站  程序员们快来瞅瞅吧!  it98k网:it98k.com

本站消息

站长简介/公众号

  出租广告位,需要合作请联系站长


+关注
已关注

分类  

暂无分类

标签  

暂无标签

日期归档  

2023-06(2)

JAVA学习笔记(中)——未完待续

发布于2021-05-29 21:57     阅读(919)     评论(0)     点赞(21)     收藏(1)


Maven

  • https://maven.apache.org/download.cgi
  • 下载apache-maven-3.8.1-bin.zip
    在这里插入图片描述在这里插入图片描述
  • 命令行mvn -version

Servlet

1、热身

  • 打开idea,create new project,Maven,maven-archetype-webapp

在这里插入图片描述在这里插入图片描述在这里插入图片描述在这里插入图片描述

  • 导入Tomcat:Add Configuration, Tomcat Server, local
    在这里插入图片描述在这里插入图片描述
  • 运行Tomcat就会打开浏览器看到首页(第一个项目教程到此结束)
  • 补充说明:右边maven方法

在这里插入图片描述

  • 补充说明:颜色标记意义
    在这里插入图片描述

2、HelloServlet

  • 创建空maven项目servlet01,再创建HelloServlet与HiServlet两个带首页模板的新module

在这里插入图片描述在这里插入图片描述在这里插入图片描述

  • 设置各模块的Artifacts

在这里插入图片描述在这里插入图片描述在这里插入图片描述在这里插入图片描述在这里插入图片描述在这里插入图片描述

  • 配置Tomcat服务器

在这里插入图片描述在这里插入图片描述

  • 成功访问http://localhost:8080/HelloServlet_war/
  • 成功访问http://localhost:8080/HiServlet_war/
  • 可选项:修改web.xml中web-app字段为最新
    在这里插入图片描述
    在这里插入图片描述

3、HiServlet

  • 在main加添加java与resources文件夹并分别标记,在 java文件夹中创建新包,包中创建新类,建立映射
  • 下面我把整个项目当前所有文件的代码放上来
    在这里插入图片描述

1

package com.cj.servlet;
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 ErrorTest extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/html");
        resp.setCharacterEncoding("utf-8");
        PrintWriter writer=resp.getWriter();
        writer.print("<h1>对不起404</h1>");
    }
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        super.doGet(req, resp);
    }
}

2

package com.cj.servlet;
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 HelloTest extends HttpServlet {
    //ctrl+o可以选择要重写的方法
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        PrintWriter writer=resp.getWriter();
        writer.print("Hello,Servlet");
        //在web.xml文件中绑定com.cj.servlet.servlet_test_01类映射到/hello路径中
        //浏览器访问localhost:8080/hello即可看到"Hello,Servlet"字样
    }
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        super.doGet(req, resp);
    }
}

3

<!DOCTYPE web-app PUBLIC
        "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
        "http://java.sun.com/dtd/web-app_2_3.dtd" >
<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"
         metadata-complete="true">
  <servlet>
    <servlet-name>hello</servlet-name>
    <servlet-class>com.cj.servlet.HelloTest</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>hello</servlet-name>
    <url-pattern>/hello</url-pattern>
  </servlet-mapping>
  <servlet>
    <servlet-name>error</servlet-name>
    <servlet-class>com.cj.servlet.ErrorTest</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>error</servlet-name>
    <url-pattern>/error</url-pattern>
  </servlet-mapping>
</web-app>

4

<html>
<body>
<h2>Hello World!1</h2>
</body>
</html>

5

<?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">
    <parent>
        <artifactId>servlet01</artifactId>
        <groupId>com.cj</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>HelloServlet</artifactId>
    <packaging>war</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

</project>

6

<!DOCTYPE web-app PUBLIC
        "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
        "http://java.sun.com/dtd/web-app_2_3.dtd" >
<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"
         metadata-complete="true">
</web-app>

7

<html>
<body>
<h2>Hello World!2</h2>
</body>
</html>

8

<?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">
    <parent>
        <artifactId>servlet01</artifactId>
        <groupId>com.cj</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>HiServlet</artifactId>
    <packaging>war</packaging>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

</project>

9

<?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>com.cj</groupId>
    <artifactId>servlet01</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>HiServlet</module>
        <module>HelloServlet</module>
    </modules>

    <dependencies>
        <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
            <scope>provided</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.servlet.jsp/javax.servlet.jsp-api -->
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>javax.servlet.jsp-api</artifactId>
            <version>2.3.3</version>
            <scope>provided</scope>
        </dependency>

    </dependencies>

</project>
  • 补充说明: 原理图
    在这里插入图片描述

4、session/cookie

原文链接:https://blog.csdn.net/cj1064789374/article/details/117298108



所属网站分类: 技术文章 > 博客

作者:听说你很拽

链接:http://www.javaheidong.com/blog/article/207464/5deb7eac60f8d00e8a2f/

来源:java黑洞网

任何形式的转载都请注明出处,如有侵权 一经发现 必将追究其法律责任

21 0
收藏该文
已收藏

评论内容:(最多支持255个字符)