web.xml

  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
  3.          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4.          xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
  5.                          http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
  6.          version="4.0"
  7.          metadata-complete="true">
  9. </web-app>

网页映射

  1. <servlet>
  2.         <servlet-name>CookieDemo03</servlet-name>
  3.         <servlet-class>com.dyq.servlet.CookieDemo03</servlet-class>
  4.     </servlet>
  5.     <servlet-mapping>
  6.         <servlet-name>CookieDemo03</servlet-name>
  7.         <url-pattern>/c3</url-pattern>
  8. </servlet-mapping>

jsp初始化

  1. <%@ page contentType="text/html;charset=UTF-8" language="java" %>
  2. <html>
  3. <body>
  4. <h2>Hello World!</h2>
  5. </body>
  6. </html>

处理前端乱码

<%@ page contentType="text/html;charset=UTF-8" language="java" %>

Servlet

  1. public class SessionDemo03 extends HttpServlet {
  2.     @Override
  3.     protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
  5.     }
  7.     @Override
  8.     protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
  9.         doGet(req, resp);
  10.     }
  11. }

后台接收中文乱码问题 （请求和响应

  1. req.setCharacterEncoding("utf-8");
  2. resp.setContentType("text/html;charset=utf-8");

解决cookie乱码

编码:
Cookie cookie = new Cookie("name", URLEncoder.encode("段雨晴","utf-8"));
解码:
out.write(URLDecoder.decode(cookie.getValue(),"utf-8"));

pom+Maven

初始化只留这些，需要再Maven导包

  1. <?xml version="1.0" encoding="UTF-8"?>
  3. <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  4.   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  5.   <modelVersion>4.0.0</modelVersion>
  7.   <groupId>com.dyq</groupId>
  8.   <artifactId>javaweb-session-cookie</artifactId>
  9.   <version>1.0-SNAPSHOT</version>
  10.   <packaging>war</packaging>
  12.   <name>javaweb-session-cookie Maven Webapp</name>
  13.   <!-- FIXME change it to the project's website -->
  14.   <url>http://www.example.com</url>
  16.   <properties>
  17.     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  18.     <maven.compiler.source>1.7</maven.compiler.source>
  19.     <maven.compiler.target>1.7</maven.compiler.target>
  20.   </properties>
  22. </project>

Maven

Servlet依赖

  1. <dependencies>
  2.  <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
  3.  <dependency>
  4.    <groupId>javax.servlet</groupId>
  5.    <artifactId>javax.servlet-api</artifactId>
  6.    <version>4.0.1</version>
  7.    <scope>provided</scope>
  8.  </dependency>
  9.  <!-- https://mvnrepository.com/artifact/javax.servlet.jsp/javax.servlet.jsp-api -->
  10.  <dependency>
  11.    <groupId>javax.servlet.jsp</groupId>
  12.    <artifactId>javax.servlet.jsp-api</artifactId>
  13.    <version>2.3.3</version>
  14.    <scope>provided</scope>
  15.  </dependency>
  17. </dependencies>

MySQL连接依赖 测试依赖

  1. <!--        单元测试-->
  2.         <dependency>
  3.             <groupId>junit</groupId>
  4.             <artifactId>junit</artifactId>
  5.             <version>4.12</version>
  6.         </dependency>
  7.         <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
  8.         <dependency>
  9.             <groupId>mysql</groupId>
  10.             <artifactId>mysql-connector-java</artifactId>
  11.             <version>8.0.23</version>
  12.         </dependency>

文件上传

image.png

  1. <!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->
  2. <dependency>
  3.     <groupId>commons-fileupload</groupId>
  4.     <artifactId>commons-fileupload</artifactId>
  5.     <version>1.4</version>
  6. </dependency>
  8. <!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
  9. <dependency>
  10.     <groupId>commons-io</groupId>
  11.     <artifactId>commons-io</artifactId>
  12.     <version>2.8.0</version>
  13. </dependency>

邮箱依赖

  1. <!-- https://mvnrepository.com/artifact/javax.mail/mail -->
  2. <dependency>
  3.     <groupId>javax.mail</groupId>
  4.     <artifactId>mail</artifactId>
  5.     <version>1.4.7</version>
  6. </dependency>
  7. <!-- https://mvnrepository.com/artifact/javax.activation/activation -->
  8. <dependency>
  9.     <groupId>javax.activation</groupId>
  10.     <artifactId>activation</artifactId>
  11.     <version>1.1.1</version>
  12. </dependency>

JSTL表达式的依赖 / standard标签库

  1. <!--        JSTL表达式的依赖-->
  2.         <dependency>
  3.             <groupId>javax.servlet.jsp.jstl</groupId>
  4.             <artifactId>jstl-api</artifactId>
  5.             <version>1.2</version>
  6.         </dependency>
  7. <!--standard标签库-->
  8.         <dependency>
  9.             <groupId>taglibs</groupId>
  10.             <artifactId>standard</artifactId>
  11.             <version>1.1.2</version>
  12.         </dependency>