<servlet>
   <servlet-name>my-dispatcher-name</servlet-name>
   <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
   <init-param>
       <!-- override default name {servlet-name}-servlet.xml -->
       <param-name>contextConfigLocation</param-name>
       <param-value>/WEB-INF/springmvc-myconfig.xml</param-value>
   </init-param>
   <load-on-startup>1</load-on-startup>
</servlet>

應(yīng)用程序的流程：

3 - 創(chuàng)建Maven工程

創(chuàng)建Maven項目類型。 Maven是幫助我們管理庫的最好方式。

在 Eclipse, 選擇 "File/New/Other..."

選擇 archetype "maven-archetype-webapp"。

輸入：

Group Id: com.yiibai
Artifact Id: HelloSpringMVC
Package: com.yiibai.springmvc

這樣將創(chuàng)建項目，結(jié)構(gòu)如下圖所示：

不要擔心項目在創(chuàng)建的時候出現(xiàn)錯誤信息。原因是，現(xiàn)在我們還沒有聲明 Servlet 庫。

在 Eclipse 中創(chuàng)建 Maven 項目結(jié)構(gòu)可能是錯誤的。需要我們?nèi)z查出來并完善。

4- 配置Spring

這是項目建成后的文件結(jié)構(gòu)圖：

配置 Maven 使用 Spring 庫.

pom.xml

<projectxmlns="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>com.yiibai</groupId>
    <artifactId>HelloSpringMVC</artifactId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>HelloSpringMVC Maven Webapp</name>
    <url>http://maven.apache.org</url>
 
 
    <dependencies>
 
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
 
        <!-- Servlet Library -->
        <!-- http://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
 
        <!-- Spring dependencies -->
        <!-- http://mvnrepository.com/artifact/org.springframework/spring-core -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>4.1.4.RELEASE</version>
        </dependency>
 
        <!-- http://mvnrepository.com/artifact/org.springframework/spring-web -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>4.1.4.RELEASE</version>
        </dependency>
 
        <!-- http://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.1.4.RELEASE</version>
        </dependency>
 
    </dependencies>
     
    <build>
        <finalName>HelloSpringMVC</finalName>
        <plugins>
         
            <!-- Config: Maven Tomcat Plugin -->
            <!-- http://mvnrepository.com/artifact/org.apache.tomcat.maven/tomcat7-maven-plugin -->
            <plugin>
                <groupId>org.apache.tomcat.maven</groupId>
                <artifactId>tomcat7-maven-plugin</artifactId>
                <version>2.2</version>
                <!-- Config: contextPath and Port (Default - /HelloSpringMVC : 8080) -->
                <!--
                <configuration>
                    <path>/</path>
                    <port>8899</port>
                </configuration>
                -->   
            </plugin>
        </plugins>
    </build>   
     
</project>

配置 web.xml：

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns="http://java.sun.com/xml/ns/javaee"
   xsi:schemaLocation="http://java.sun.com/xml/ns/javaeehttp://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
   id="WebApp_ID" version="3.0">
    
   <display-name>HelloWorldSpring</display-name>
    
   <servlet>
       <servlet-name>spring-mvc</servlet-name>
       <servlet-class>
           org.springframework.web.servlet.DispatcherServlet
       </servlet-class>
       <load-on-startup>1</load-on-startup>
   </servlet>   
    
   <servlet-mapping>
       <servlet-name>spring-mvc</servlet-name>
       <url-pattern>/</url-pattern>
   </servlet-mapping>
 
    <!-- Other XML Configuration -->
   <!-- Load by Spring ContextLoaderListener -->
   <context-param>
       <param-name>contextConfigLocation</param-name>
       <param-value>/WEB-INF/root-context.xml</param-value>
   </context-param>
 
    
    <!-- Spring ContextLoaderListener -->
   <listener>
       <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
   </listener>
    
</web-app>

Spring MVC 的 DispatcherServlet將根據(jù)原則讀取XML配置文件：

{servlet-name} ==> /WEB-INF/{servlet-name}-servlet.xml

spring-mvc-servlet.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:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans-4.1.xsd 
      http://www.springframework.org/schema/context
      http://www.springframework.org/schema/context/spring-context-4.1.xsd 
      http://www.springframework.org/schema/mvc
      http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd">
 
   <context:component-scan base-package="com.yiibai.tutorial.springmvc"/>
    
   <context:annotation-config/>
    
   <bean
       class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        
       <property name="prefix">
           <value>/WEB-INF/pages/</value>
       </property>
        
       <property name="suffix">
           <value>.jsp</value>
       </property>       
        
   </bean>
    
</beans>

注:
在Spring應(yīng)用程序 ContextLoaderListener 將讀取其他 XML 配置文件(如下的 abc.xml 和 root-context.xml 兩個文件)。可能不需要配置 ContextLoaderListener，如果你的應(yīng)用程序并不需要讀取其他XML配置文件。

<!-- web.xml -->
<!-- Spring ContextLoaderListener -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
 
<!-- Load by Spring ContextLoaderListener -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
       /WEB-INF/root-context.xml,
       /WEB-INF/abc.xml
 </param-value>
</context-param>

/WEB-INF/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>

HelloWorldController.java

package com.yiibai.springmvc;
 
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
 
@Controller
public class HelloWorldController {
 
    @RequestMapping("/hello")
    public String hello(Model model) {
         
        model.addAttribute("greeting", "Hello Spring MVC");
         
        return"helloworld";
         
    }
 
}

helloworld.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"  pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Spring4 MVC -HelloWorld</title>
</head>
<body>
    <h1>${greeting}</h1>
</body>
</html>

5- 運行Spring應(yīng)用程序

首先，運行應(yīng)用程序之前，需要構(gòu)建整個項目。

右鍵單擊該項目并選擇：

Run As/Maven install

運行配置：

輸入:

Name: Run HelloSpringMVC
Base directory: ${workspace_loc:/HelloSpringMVC} =>${workspace_loc:/HelloSpringMVC Maven Webapp}
Goals: tomcat7:run

點擊Run:

第一次運行該程序?qū)⑿枰獛追昼?看你的網(wǎng)速)，它需要下載 Tomcat 插件庫才能運行。

一切準備就緒：

運行URL，如下圖：

http://localhost:8080/HelloSpringMVC/hello

6 - 應(yīng)用程序的流程

完成您的項目后，并成功地在上一步中運行?，F(xiàn)在，我們來看一看程序的運行方式。

7- 控制器和方法

7.1- HttpServletRequest & HttpServletResponse

可以使用 HttpServletRequest, HttpServletResponse 在控制器的方法中。

OtherExampleController.java

package com.yiibai.springmvc;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
 
@Controller
public class OtherExampleController {
 
   ......
 
   @RequestMapping("/somePath")
   public String requestResponseExample(HttpServletRequest request,
           HttpServletResponse reponses, Model model) {
 
       // Todo something here
 
       return "someView";
   }
 
   ......
}

7.2- 控制器中的重定向

使用前綴 "redirect:" ，該方法返回字符串，可以重定向到另一頁面。參見圖：

RedirectExampleController.java

package com.yiibai.springmvc;
 
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
 
@Controller
public class RedirectExampleController {
 
    @RequestMapping(value = "/redirect", method = RequestMethod.GET)
    public String authorInfo(Model model) {
 
       // Do somethong here
 
        return "redirect:/hello";
    }
}

運行URL:

http://localhost:8080/HelloSpringMVC/redirect

7.3- @RequestParam示例

使用@RequestParam 注解將請求參數(shù)綁定到你的控制器方法參數(shù)。

下面的代碼片段顯示了這個用法：

RequestParamExampleController.java

package com.yiibai.springmvc;
 
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
 
@Controller
public class RequestParamExampleController {
     
    @RequestMapping("/user")
    public String userInfo(Model model,
            @RequestParam(value = "name", defaultValue = "Guest") String name) {
 
        model.addAttribute("name", name);
 
        if("admin".equals(name)) {
            model.addAttribute("email", "admin@yiibai.com");
        } else{
            model.addAttribute("email", "Not set");
        }
        return "userInfo";
    }
  
}

/WEB-INF/pages/userInfo.jsp

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>User Info</title>
</head>
<body>
 
   <h2>${name}</h2>
 
   Email: ${email}
   <br>
</body>
</html>

運行 URL:

http://localhost:8080/HelloSpringMVC/user?name=admin

7.4- @PathVariable示例

在Spring MVC中，可以使用@PathVariable注釋將一個方法參數(shù)綁定到一個URI模板變量的值：

例如，這是一個模板的URI：

/web/fe/{sitePrefix}/{language}/document/{id}/{naturalText}

而下面的 URI 模板匹配上面：

/web/fe/default/en/document/8108/spring-mvc-for-beginners
/web/fe/default/vi/document/8108/spring-mvc-cho-nguoi-moi-bat-dau
.....

下面的代碼片段顯示了用法：

PathVariableExampleController.java

package com.yiibai.springmvc;
 
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
 
@Controller
public class PathVariableExampleController {
  
 
    /**
     * @PathVariable Example:
     *
     */
    @RequestMapping("/web/fe/{sitePrefix}/{language}/document/{id}/{naturalText}")
    public String documentView(Model model,
            @PathVariable(value = "sitePrefix") String sitePrefix,
            @PathVariable(value = "language") String language,
            @PathVariable(value = "id") Long id,
            @PathVariable(value = "naturalText") String naturalText) {
 
        model.addAttribute("sitePrefix", sitePrefix);
        model.addAttribute("language", language);
        model.addAttribute("id", id);
        model.addAttribute("naturalText", naturalText);
 
        String documentName = "Java tutorial for Beginners";
        if(id == 8108) {
            documentName = "Spring MVC for Beginners";
        }
 
        model.addAttribute("documentName", documentName);
 
        return "documentView";
    }
}

/WEB-INF/pages/documentView.jsp

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>${documentName}</title>
</head>
<body>
 
    <h3>${documentName}</h3>
 
    Site Prefix: ${sitePrefix}
    <br> Language: ${language}
    <br> ID: ${id}
    <br> Natural Text: ${naturalText}
    <br>
 
</body>
</html>

運行 URL:

http://localhost:8080/HelloSpringMVC/web/fe/default/en/document/8108/spring-mvc-for-beginners

7.5- @ResponseBody示例

如果您使用 @ResponseBody 注釋到方法， spring 將嘗試轉(zhuǎn)換它的返回值，并自動寫入到HTTP響應(yīng)。在這種情況下，并不需要一個特定的視圖。

注：方法不一定需要返回字符串類型。

使用@ResponseBody和方法返回字符串的簡單例子。

ResponseBodyExample1Controller.java

package com.yiibai.springmvc;
 
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
 
@Controller
public class ResponseBodyExample1Controller {
 
    // Simple example, method returns String.
    @RequestMapping(value = "/saveResult")
    @ResponseBody
    publicString authorInfo(Model model) {
        return "saved";
    }
 
     
}

運行示例的結(jié)果：