Maven新建一个Spring MVC项目

新建一个Maven项目，选择archetypes为maven-archetype-webapp，
相关的名称按个人习惯取，我这里取
Group Id:moonlit-group
Artifact Id:moonlit-artifact
然后一个新的maven webapp项目就见成了，你可以在Eclipse左侧的Project Explorer中看到一个项目名为moonlit-artifact，这个即是我们新间的项目的名称。
新建完项目之后会发现项目有个红叉，一直追溯过去会发现是webapp目录下的index.jsp下面有一个红叉，解决办法是：把tomcat的运行时环境添加进来。Project --> Properties --> Libraries --> add Library --> Server Runtime，把对应的tomcat添加进来就可以了。
此时虽然红叉没有了，但是感叹号还存在。这是因为项目引用的Jre版本和本季上装载的Java版本不一致造成的。
修改方式如下：
Project-->Properties-->Java Build Path-->Libraries->JRE System Library的版本改成本机搭载的Java版本。（这一步我没有改动）
把Project Facets中Java的版本改成本机Java的版本（我就该了这里感叹号就没有了）。
在我写这篇博客的时候，spring相关的最新版本是4.3.0.RELEASE，junit的最新版本是4.1.2，我们这里以最新版为例。
首先在pom.xml目录下添加一些相关的dependency，然后右键运行maven install，第一次可能需要一点时间下载dependencies里面的jar包。
pom.xml:

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>moonlit-group</groupId>
  <artifactId>moonlit-artifact</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>moonlit-artifact Maven Webapp</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <springversion>4.3.0.RELEASE</springversion>
    <junitversion>4.12</junitversion>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>${junitversion}</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>${springversion}</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
    <!-- dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-asm</artifactId>
      <version>3.1.4.RELEASE</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aspects</artifactId>
      <version>${springversion}</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>${springversion}</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>${springversion}</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context-support</artifactId>
      <version>${springversion}</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>${springversion}</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-expression</artifactId>
      <version>${springversion}</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>${springversion}</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jms</artifactId>
      <version>${springversion}</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-orm</artifactId>
      <version>${springversion}</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-oxm</artifactId>
      <version>${springversion}</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>${springversion}</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>${springversion}</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${springversion}</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>${springversion}</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
      <type>jar</type>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>commons-collections</groupId>
      <artifactId>commons-collections</artifactId>
      <version>3.1</version>
    </dependency>
    <dependency>
      <groupId>commons-logging</groupId>
      <artifactId>commons-logging</artifactId>
      <version>1.1</version>
    </dependency>
  </dependencies>

  <build>
    <finalName>moonlit-artifact</finalName>
  </build>
</project>

applicationContext.xml（放在WEB-INF/目录下）:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
        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
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">

    <mvc:annotation-driven />
    <context:component-scan base-package="com.moonlit.*" />

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

</beans>

web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<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">
    <display-name></display-name>
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>

    <!-- Spring的log4j监听器 -->
    <listener>
        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
    </listener>

    <!-- 核心控制器 -->
    <servlet>
        <servlet-name>book</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/applicationContext.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <servlet-mapping>
        <servlet-name>book</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

</web-app>

model：book.java

package com.moonlit.model;

public class Book {
    private int id;
    private String name;
    private String author;
    public Book(){}
    public Book(int id, String name, String author) {
        super();
        this.id = id;
        this.name = name;
        this.author = author;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getAuthor() {
        return author;
    }
    public void setAuthor(String author) {
        this.author = author;
    }
}

Dao：bookDao.java

package com.moonlit.dao;

import org.springframework.stereotype.Component;

import com.moonlit.model.Book;

@Component
public class BookDao {

    //模拟数据库操作
    public void add(Book book){
        System.out.print("Add");
    }
    public void update(Book book){
        System.out.print("Update");
    }
}

Service：BookService.java

package com.moonlit.service;

import javax.annotation.Resource;

import org.springframework.stereotype.Component;

import com.moonlit.dao.BookDao;
import com.moonlit.model.Book;

@Component
public class BookService {

    private BookDao bookDao;

    public BookDao getBookDao() {
        return bookDao;
    }

    @Resource
    public void setBookDao(BookDao bookDao) {
        this.bookDao = bookDao;
    }

    public void add(Book book){
        bookDao.add(book);
    }
    public void update(Book book){
        bookDao.update(book);
    }

}

controller：BookController.java

package com.moonlit.controller;

import javax.annotation.Resource;

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

import com.moonlit.model.Book;
import com.moonlit.service.BookService;

@Controller
@RequestMapping("/book.do")
public class BookController {

    private BookService bookService;
    @RequestMapping(params = "method=add")
    public String add(Book book){
        System.out.println("bookname:"+book.getName());
        System.out.println("author:"+book.getAuthor());
        bookService.add(book);
        return "success";
    }
    @RequestMapping(params = "method=update")
    public String update(Book book) {
        bookService.update(book);
        return "success";
    }
    public BookService getBookService() {
        return bookService;
    }
    @Resource
    public void setBookService(BookService bookService) {
        this.bookService = bookService;
    }

}

index.jsp:

<html>
<body>
<h2>Add Book</h2>
<form method="post" action="<%=request.getContextPath() %>/book.do?method=add">
bookname:<input type="text" name="name" id="name">
author:<input type="text" name="author" id="author">
<input type="submit" value="Add">
</form>
</body>
</html>

运行后可在Console中查看效果，比如，当我填写书名为harry potter，作者为moonlit之后，Console中会显示：

bookname:harry potter
author:moonlit
Add