STS用Maven写一个登录页面 - 静态登录页面
上一章我们写了一个HelloWorld,这一章在此基础上写出一个登录页面。
一、当前目录结构为:
之所以运行后出现HelloWord的页面,是因为server启动时会默认执行index.jsp
二、改写HelloWorld程序为登录页面
1. 让server启动到我们自己的页面而不是index.jsp
先在webapp下新建一个folder名为pages:右键webapp -》New -》Folder,取名pages。
在pages文件夹下创建一个login.jsp:右键pages -》New -》Other -》Web -》JSP File,取名为login.jsp。
修改web.xml中默认启动文件,这个web.xml就是Demo下的,而不是刚才看到的server下面的。
然后三步走:
a. Maven -> Update Project
b. Run as -> maven install
c. Run as -> Run onServer
可以看到默认启动的页面已经被修改,那么如果我们想要启动的页面由java的controller去控制,又该如何呢。
2. 创建Java入口文件
在src/main/java下新建一个package名为com.test.demo(这个地方去看pom.xml中定义的groupId),然后此package下新建一个java类名为Demo.java,这个名字可以随便取。
编写Java文件
可以看到有些lib都飘红了,到pom.xml里面去把它们配置上。
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>com.test.demo</groupId> <artifactId>Demo</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>war</packaging> <name>Demo Maven Webapp</name> <!-- FIXME change it to the project's website --> <url>http://www.example.com</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <maven.compiler.source>1.8</maven.compiler.source> <maven.compiler.target>1.8</maven.compiler.target> <org.springframework-version>4.2.6.RELEASE</org.springframework-version> <org.slf4j-version>1.7.5</org.slf4j-version> </properties> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>4.3.8.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>4.3.8.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>4.3.8.RELEASE</version> </dependency> </dependencies> <build> <finalName>Demo</finalName> <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) --> <plugins> <plugin> <artifactId>maven-clean-plugin</artifactId> <version>3.1.0</version> </plugin> <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging --> <plugin> <artifactId>maven-resources-plugin</artifactId> <version>3.0.2</version> </plugin> <plugin> <artifactId>maven-compiler-plugin</artifactId> <version>3.8.0</version> </plugin> <plugin> <artifactId>maven-surefire-plugin</artifactId> <version>2.22.1</version> </plugin> <plugin> <artifactId>maven-war-plugin</artifactId> <version>3.2.2</version> </plugin> <plugin> <artifactId>maven-install-plugin</artifactId> <version>2.5.2</version> </plugin> <plugin> <artifactId>maven-deploy-plugin</artifactId> <version>2.8.2</version> </plugin> </plugins> </pluginManagement> </build> </project>
接着在pages文件夹下新建一个HomeController.jsp
配置web.xml
在WEB-INF下创建一个my-servlet.xml和root-context.xml
my-servlet.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"> <context:component-scan base-package="com.test.demo"/> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix"> <value>/pages/</value> </property> <property name="suffix"> <value>.jsp</value> </property> </bean> </beans>
root-context.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <!-- Empty --> </beans>
my-servlet指定了controller会访问的位置
这就拼凑成了/pages/HomeController.jsp,所以当value时根目录时,直接访问HomeController.jsp
三步走:
如果发现有单词是因为拼写问题飘红,可以【Windows】-》【Preferences】-》【General】-》【Editors】-》【Text Editors】-》【Spelling】,取消Enable spell checking前面的√
3. 写一个登录页面
login.jsp - https://www.cnblogs.com/guo-xu/p/7875760.html
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="login.jsp" method = "get">
<table align = "center" border = "1" width = "500">
<tr>
<td>username: </td>
<td>
<input type = "text" name = "username"/>
</td>
</tr>
<tr>
<td>password:</td>
<td>
<input type = "password" name = "password"/>
</td>
</tr>
<tr align = "center">
<td colspan = "2">
<input type = "submit" value = "login"/>
<input type = "reset" value = "reset"/>
</td>
</tr>
</table>
</form>
</body>
</html>
Demo.java
运行程序:
成功写了一个登录界面,后续在写如何如何动态登录。