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cicadasmile
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JavaEE基础(02)：Servlet核心API用法详解
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‎README.md

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# 参考文章
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[JavaEE基础(01)：Servlet实现方式，生命周期执行过程](https://mp.weixin.qq.com/s?__biz=MzU4Njg0MzYwNw==&mid=2247484304&idx=1&sn=dd6b6852e35031dd07f70d441f3ddc85&chksm=fdf45728ca83de3e158597030cf46b1677eccf533f9e1412690cd64b0ec0cce544711ceabddb&token=1248678182&lang=zh_CN#rd)<br/>
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[JavaEE基础(02)：Servlet核心API用法详解](https://mp.weixin.qq.com/s?__biz=MzU4Njg0MzYwNw==&mid=2247484309&idx=1&sn=fc8237aef2f246f85b978561f4b37e1e&chksm=fdf4572dca83de3b8affdf4a9a8c8b3c18e4c5203c3e663e0bfaeb53788d3e2d26fa829bb8c6&token=1248678182&lang=zh_CN#rd)<br/>
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持续更新中...
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‎java-ee-base-parent/node02-servlet-api/pom.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>java-ee-base-parent</artifactId>
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<groupId>com.java.ee.parent</groupId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.node02.servlet</groupId>
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<artifactId>node02-servlet-api</artifactId>
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<packaging>war</packaging>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<maven.compiler.source>1.8</maven.compiler.source>
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<maven.compiler.target>1.8</maven.compiler.target>
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<jstl.version>1.2</jstl.version>
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<servlet-api.version>2.5</servlet-api.version>
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<jsp-api.version>2.0</jsp-api.version>
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</properties>
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<dependencies>
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<!-- JSP相关 依赖包-->
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<dependency>
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<groupId>jstl</groupId>
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<artifactId>jstl</artifactId>
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<version>${jstl.version}</version>
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</dependency>
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<dependency>
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<groupId>javax.servlet</groupId>
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<artifactId>jsp-api</artifactId>
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<version>${jsp-api.version}</version>
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<scope>provided</scope>
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</dependency>
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<!-- servlet依赖包 -->
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<dependency>
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<groupId>javax.servlet</groupId>
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<artifactId>servlet-api</artifactId>
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<version>${servlet-api.version}</version>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.12</version>
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</dependency>
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</dependencies>
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</project>

‎java-ee-base-parent/node02-servlet-api/src/main/java/com/node02/servlet/impl/ServletFourImpl.java

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package com.node02.servlet.impl;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import java.io.IOException;
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public class ServletFourImpl extends HttpServlet {
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@Override
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protected void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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response.setContentType("text/html;charset=utf-8") ;
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response.setCharacterEncoding("UTF-8");
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response.setStatus(200) ;
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response.getWriter().print("Hello,知了");
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response.getOutputStream().print("hello");
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}
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@Override
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protected void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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response.setContentType("text/html;charset=utf-8");
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response.getWriter().print("执行：doPost");
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}
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}

‎java-ee-base-parent/node02-servlet-api/src/main/java/com/node02/servlet/impl/ServletOneImpl.java

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package com.node02.servlet.impl;
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import javax.servlet.*;
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import java.io.IOException;
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import java.util.Enumeration;
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public class ServletOneImpl implements Servlet {
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@Override
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public void init(ServletConfig servletConfig) throws ServletException {
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String servletName = servletConfig.getServletName() ;
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System.out.println("servletName="+servletName);
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String myName = servletConfig.getInitParameter("my-name") ;
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System.out.println("myName="+myName);
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Enumeration paramNames = servletConfig.getInitParameterNames() ;
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while (paramNames.hasMoreElements()){
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String paramKey = String.valueOf(paramNames.nextElement()) ;
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String paramValue = servletConfig.getInitParameter(paramKey) ;
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System.out.println("paramKey="+paramKey+";paramValue="+paramValue);
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}
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ServletContext servletContext = servletConfig.getServletContext() ;
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servletContext.setAttribute("cicada","smile");
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}
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@Override
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public ServletConfig getServletConfig() {
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return null;
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}
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@Override
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public void service(ServletRequest servletRequest, ServletResponse servletResponse)
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throws ServletException, IOException {
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}
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@Override
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public String getServletInfo() {
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return null;
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}
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@Override
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public void destroy() {
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}
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}

‎java-ee-base-parent/node02-servlet-api/src/main/java/com/node02/servlet/impl/ServletThreeImpl.java

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package com.node02.servlet.impl;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import java.io.IOException;
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public class ServletThreeImpl extends HttpServlet {
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@Override
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protected void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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// http://localhost:6003/servletThreeImpl?myName=cicada
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String method = request.getMethod();
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System.out.println("method="+method); // GET
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String requestURL = request.getRequestURL().toString();
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// http://localhost:6003/servletThreeImpl
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System.out.println("requestURL="+requestURL);
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String requestURI = request.getRequestURI();
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System.out.println("requestURI="+requestURI); // /servletThreeImpl
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String queryString = request.getQueryString() ;
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System.out.println("queryString="+queryString); // myName=cicada
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String myName = request.getParameter("myName");
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System.out.println("myName="+myName); // cicada
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}
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@Override
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protected void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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response.setContentType("text/html;charset=utf-8");
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response.getWriter().print("执行：doPost");
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}
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}

‎java-ee-base-parent/node02-servlet-api/src/main/java/com/node02/servlet/impl/ServletTwoImpl.java

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package com.node02.servlet.impl;
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import javax.servlet.ServletContext;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import java.io.IOException;
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public class ServletTwoImpl extends HttpServlet {
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@Override
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protected void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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response.setContentType("text/html;charset=utf-8");
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// 1、参数传递
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ServletContext servletContext = this.getServletContext() ;
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String value = String.valueOf(servletContext.getAttribute("cicada")) ;
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System.out.println("value="+value);
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// 2、获取初始化参数
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String myBlog = servletContext.getInitParameter("my-blog") ;
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System.out.println("myBlog="+myBlog);
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// 3、获取应用信息
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String servletContextName = servletContext.getServletContextName() ;
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System.out.println("servletContextName="+servletContextName);
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// 4、获取路径
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String pathOne = servletContext.getRealPath("/") ;
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String pathTwo = servletContext.getRealPath("/WEB-INF/") ;
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System.out.println("pathOne="+pathOne+";pathTwo="+pathTwo);
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response.getWriter().print("执行：doGet; value："+value);
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}
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@Override
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protected void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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response.setContentType("text/html;charset=utf-8");
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response.getWriter().print("执行：doPost");
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}
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}

‎java-ee-base-parent/node02-servlet-api/src/main/webapp/WEB-INF/web.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns="http://java.sun.com/xml/ns/javaee"
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xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
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id="WebApp_ID" version="3.0">
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<display-name>cicada_servlet</display-name>
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<context-param>
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<param-name>encoding</param-name>
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<param-value>UTF-8</param-value>
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</context-param>
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<!-- 参数配置 -->
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<context-param>
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<param-name>my-name</param-name>
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<param-value>smile</param-value>
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</context-param>
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<context-param>
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<param-name>my-blog</param-name>
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<param-value>2019-11-19</param-value>
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</context-param>
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<!-- Servlet配置 -->
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<servlet>
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<init-param>
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<param-name>my-name</param-name>
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<param-value>cicada</param-value>
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</init-param>
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<servlet-name>servletOneImpl</servlet-name>
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<servlet-class>com.node02.servlet.impl.ServletOneImpl</servlet-class>
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</servlet>
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<servlet-mapping>
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<servlet-name>servletOneImpl</servlet-name>
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<url-pattern>/servletOneImpl</url-pattern>
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</servlet-mapping>
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<servlet>
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<servlet-name>servletTwoImpl</servlet-name>
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<servlet-class>com.node02.servlet.impl.ServletTwoImpl</servlet-class>
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</servlet>
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<servlet-mapping>
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<servlet-name>servletTwoImpl</servlet-name>
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<url-pattern>/servletTwoImpl</url-pattern>
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</servlet-mapping>
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<servlet>
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<servlet-name>servletThreeImpl</servlet-name>
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<servlet-class>com.node02.servlet.impl.ServletThreeImpl</servlet-class>
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</servlet>
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<servlet-mapping>
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<servlet-name>servletThreeImpl</servlet-name>
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<url-pattern>/servletThreeImpl</url-pattern>
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</servlet-mapping>
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<servlet>
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<servlet-name>servletFourImpl</servlet-name>
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<servlet-class>com.node02.servlet.impl.ServletFourImpl</servlet-class>
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</servlet>
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<servlet-mapping>
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<servlet-name>servletFourImpl</servlet-name>
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<url-pattern>/servletFourImpl</url-pattern>
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</servlet-mapping>
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</web-app>

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