启动一个简单的maven项目

1.eclipse-file-new-other:搜索maven，建立一个maven项目，勾选上 Create a simple project点击finish

2.写好Group Id 和Artifact Id ,Packaging选择 war

3.建好工程后会报错，右键Deployment Descriptor:demo2  选择最长的Generate Deployment Descriptor stub ，此时会自动创建web.xml,报错消失。

4.现在可以创建web.xml如下：

<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>

<filter>
　　<filter-name>CharacterEncodingFilter</filter-name>
　　<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
　　<init-param>
　　　　<param-name>encoding</param-name>
　　　　<param-value>utf-8</param-value>
　　</init-param>
</filter>

<filter-mapping>
　　<filter-name>CharacterEncodingFilter</filter-name>
　　<url-pattern>/*</url-pattern>
</filter-mapping>

<servlet>
　　<servlet-name>SpringMVC</servlet-name>
　　<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
　　<init-param>（配置spring-mvc.xml的路径很重要，要是配置错误的话，会报错找不到文件的错误）
　　　　<param-name>contextConfigLocation</param-name>
　　　　<param-value>classpath:/spring-mvc.xml</param-value>
　　</init-param>
<load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
　　<servlet-name>SpringMVC</servlet-name>
　　<url-pattern>*.do</url-pattern>
</servlet-mapping>

5.然后写好spring-mvc.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"
    xmlns:context="http://www.springframework.org/schema/context" 
    xmlns:jdbc="http://www.springframework.org/schema/jdbc"  
    xmlns:jee="http://www.springframework.org/schema/jee" 
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:aop="http://www.springframework.org/schema/aop" 
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:util="http://www.springframework.org/schema/util"
    xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
        http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd
        http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.2.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.3.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd">
   <!-- Spring MVC -->
   
        <!-- 配置组件扫描 -->
        <context:component-scan 
            base-package="cn.frode.controller"/>
            
        <!-- 配置ViewResolver配置视图解析器 r -->
        <bean 
            class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" 
                value="/web/" />
            <property name="suffix" 
                value=".jsp" />
        </bean>
         <!-- 注解驱动 -->
        <mvc:annotation-driven />
</beans>

6.pom.xml--这个pom.xml中有一些是用不到的，基本的都在这里可以参考。
注：
　　如果没有servlet的jar包会导致jsp页面报错。
　　如果你的jdk版本是1.8，spring的版本要是4.0以上的，否则不兼容，导致扫描不到包。

<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>cn.frode</groupId>
  <artifactId>demo</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  <dependencies>
      <!-- spring-webmvc 如果是jdk8的话需要用spring4.0以上的版本-->
      <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-webmvc</artifactId>
          <version>4.2.6.RELEASE</version>
      </dependency>
      <!-- spring-jdbc -->
      <dependency>
          <groupId>org.springframework</groupId>
          <artifactId>spring-jdbc</artifactId>
          <version>4.2.6.RELEASE</version>
      </dependency>
         <!-- servlet-api -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
        </dependency>
      <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
      <!-- junit-单元测试-->
      <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <version>4.12</version>
      </dependency>
      <!-- mybatis,mybatis-spring -->
      <dependency>
          <groupId>org.mybatis</groupId>
          <artifactId>mybatis</artifactId>
          <version>3.2.5</version>
      </dependency>
      <dependency>
          <groupId>org.mybatis</groupId>
          <artifactId>mybatis-spring</artifactId>
          <version>1.3.1</version>
      </dependency>
      <!-- mysql,commons-dbcp -->
  <!--     <dependency>
          <groupId>mysql-connector-java</groupId>
          <artifactId>mysql-connector-java</artifactId>
          <version>5.1.37</version>
      </dependency> -->
      <dependency>
          <groupId>commons-dbcp</groupId>
          <artifactId>commons-dbcp</artifactId>
          <version>1.4</version>
      </dependency>
      <!-- jackson * 3 -->
      <dependency>
          <groupId>com.fasterxml.jackson.core</groupId>
          <artifactId>jackson-core</artifactId>
          <version>2.8.3</version>
      </dependency>
      <dependency>
          <groupId>com.fasterxml.jackson.core</groupId>
          <artifactId>jackson-databind</artifactId>
          <version>2.8.3</version>
      </dependency>
      <dependency>
          <groupId>com.fasterxml.jackson.core</groupId>
          <artifactId>jackson-annotations</artifactId>
          <version>2.8.3</version>
      </dependency>
      <!-- jstl -->
     <!-- <dependency>
      <groupId>Jstl</groupId>
      <artifactId>Jstl</artifactId>
      <version>1.2</version>
    </dependency>  -->
    <!-- 消息摘要技术jar包 -->
    <dependency>
      <groupId>commons-codec</groupId>
      <artifactId>commons-codec</artifactId>
      <version>1.10</version>
    </dependency>
    <!-- 文件上传依赖jar包 -->
    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>1.2</version>
    </dependency>
    <!-- 文件上传 -->
    <dependency>
      <groupId>commons-fileupload</groupId>
      <artifactId>commons-fileupload</artifactId>
      <version>1.2</version>
    </dependency>
  </dependencies>
</project>

7.jsp文件放置的路径

解决jsp字符集设置的问题：

填写字符集之后点击Update，以后新建的jsp页面都是这个设置的字符集了。

8.controller层--我的项目在web下面有一个hello.jsp页面

package cn.frode.controller;

@Controller
@RequestMapping("/user")//
public class FrodeController {
    @RequestMapping("/hello")
    public String hello(){
        return "hello";
    }
}

 8.访问成功

默认情况下访问web.xml中的welcome-file的配置页面

通过DispatcherServlet分发给controller在返回给ModelAndView进行解析的页面

附上我的项目的路径

 这样就可以将一个简单的项目走通了！

可忽略：https://www.cnblogs.com/fengxiaoyuan/p/11842743.html