maven+springmvc的小例子

新建一个maven工程，勾选骨架，项目路径选择在workspace目录下，放在workspace中是会出错的。
由于我的需求是war包，所以我在下拉表中选择了war。
先看pom.xml文件代码如下：

<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>4.0.0modelVersion>
  <groupId>com.cmbchina.ccgroupId>
  <artifactId>springmvctestartifactId>
  <version>0.0.1-SNAPSHOTversion>
  <packaging>warpackaging>
  <name>springmvctestname>

    <dependencies>
    <dependency>
      <groupId>junitgroupId>
      <artifactId>junitartifactId>
      <version>3.8.1version>
      <scope>testscope>
    dependency>

    <dependency>
            <groupId>javax.servletgroupId>
            <artifactId>javax.servlet-apiartifactId>
            <version>3.0.1version>
            <scope>compilescope>
        dependency>


        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-webartifactId>
            <version>4.1.2.RELEASEversion>
        dependency>
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-webmvcartifactId>
            <version>4.1.2.RELEASEversion>
        dependency>
        dependencies>

        <build>
        <plugins>
            
            <plugin>
                <groupId>org.apache.maven.pluginsgroupId>
                <artifactId>maven-compiler-pluginartifactId>
                <version>2.3.2version>
                <configuration>
                    <source>1.7source>
                    <target>1.7target>
                configuration>
            plugin>
        plugins>
    build>
project>

在Java Resources，src/main/java中新建com.springdemo.controller.DemoController.java
代码如下：

package com.springdemo.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/demo")
public class DemoController {

    @RequestMapping("/index")
    public String index(){
        System.out.println("nihao");
        return "demo";
    }
}

在src/main/java/webapp/WEB-INF下新建web.xml配置如下：

<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">

    <servlet>
        <servlet-name>springservlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
    servlet>

    <servlet-mapping>
        <servlet-name>springservlet-name>
        <url-pattern>/url-pattern>
    servlet-mapping>

web-app>

以上配置，默认它会找serlet-name-servlet.xml，即我们配置的spring-servlet.xml

所以我们在WEB-INF下新建spring-servlet.xml，这就是springmvc的配置文件，当然我们也可以修改web.xml中的配置来把它改为通用的spring-mvc.xml
这里我们不改，就用spring-servlet.xml，代码如下

<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:tx="http://www.springframework.org/schema/tx" xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
       http://www.springframework.org/schema/beans/spring-beans.xsd 
       http://www.springframework.org/schema/context 
       http://www.springframework.org/schema/context/spring-context.xsd 
       http://www.springframework.org/schema/tx 
       http://www.springframework.org/schema/tx/spring-tx.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    
    <context:component-scan base-package="com.springdemo.controller" />

    
    <mvc:annotation-driven />

    
    <mvc:default-servlet-handler />

    
    <bean
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/view/">property>
        <property name="suffix" value=".jsp">property>
    bean>

beans>

视图解析器中配置了，所以我们在WEB-INF中新建view文件夹，再建demo.jsp

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

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>首页title>
head>
<body>
    <h1>This is SpringMVC Demoh1>
body>
html>

在网页中输入：http://localhost:8080/springtest/demo/index，页面就会出现This is Spring Demo。
或者在postman中输入，它会返回html代码。
值得注意的是：这里要加上项目名称springtest，否则会出现404.