Spring 4 学习笔记- SpringWeb MVC RestFul 项目搭建

125 阅读 0 评论 83 点赞

我是靠谱客的博主隐形月饼，最近开发中收集的这篇文章主要介绍Spring 4 学习笔记- SpringWeb MVC RestFul 项目搭建，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

项目地址： https://git.oschina.net/jerryxiao/Spring.git

1. 使用Eclipse创建一个Maven Web APP 项目，并添加如下库，spring-web, spring-mvc,fasterxml ，其pom.xml文件如图所示：

<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>Spring</groupId>
	<artifactId>Spring</artifactId>
	<packaging>war</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<name>Spring Maven Webapp</name>
	<url>http://maven.apache.org</url>
	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.12</version>
    </dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-web</artifactId>
			<version>4.3.1.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>4.2.7.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-log4j12</artifactId>
			<version>1.7.6</version>
		</dependency>
		<dependency>
			<groupId>javax.servlet.jsp.jstl</groupId>
			<artifactId>jstl-api</artifactId>
			<version>1.2</version>
		</dependency>

		<dependency>
			<groupId>javax.servlet.jsp.jstl</groupId>
			<artifactId>javax.servlet.jsp.jstl-api</artifactId>
			<version>1.2.1</version>
		</dependency>

		<dependency>
			<groupId>taglibs</groupId>
			<artifactId>standard</artifactId>
			<version>1.1.2</version>
			<scope>compile</scope>
		</dependency>

		<dependency>
			<groupId>org.springframework.security</groupId>
			<artifactId>spring-security-test</artifactId>
			<version>4.1.1.RELEASE</version>
		</dependency>
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-annotations</artifactId>
			<version>2.8.0</version>
		</dependency>
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-core</artifactId>
			<version>2.8.0</version>
		</dependency>
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-databind</artifactId>
			<version>2.8.0</version>
		</dependency>
		<dependency>
			<groupId>com.fasterxml.jackson.jaxrs</groupId>
			<artifactId>jackson-jaxrs-json-provider</artifactId>
			<version>2.0.0</version>
		</dependency>
	</dependencies>
	<build>
		<finalName>Spring</finalName>
	</build>
</project>

2. 配置消息转换器，将原有的html视图类型转成json格式（本例采用json格式，可以配置xml转换器等等）。其Servlet配置如下所示：

<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" xmlns:mvc="http://www.springframework.org/schema/mvc"
	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
        http://www.springframework.org/schema/mvc 
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">

	<context:component-scan base-package="tom.spring.controller" />
	
	<context:annotation-config />

	<mvc:annotation-driven
		content-negotiation-manager="contentManager" conversion-service="conversionService">
		<mvc:message-converters>
			<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter" />
		</mvc:message-converters>
	</mvc:annotation-driven>

	<bean
		class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor" />

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

	<bean id="conversionService"
		class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
	</bean>

	<bean id="contentManager"
		class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
		<property name="favorPathExtension" value="true" />
		<property name="ignoreAcceptHeader" value="true" />
		<property name="defaultContentType" value="application/json" />
		<property name="useJaf" value="false" />
		<property name="mediaTypes">
			<map>
				<entry key="json" value="application/json" />
				<entry key="sjson" value="application/sjson" />
				<entry key="html" value="text/html" />
				<entry key="xml" value="application/xml" />
			</map>
		</property>
	</bean>
	
</beans>

在标签 mvc:message-converters 中可以添加多种类型的转换器，转换器会根据请求header中类型来自动选择适合的转换器；其中InternalResourceViewResolver 是为渲染jsp文件配置。

3. 在web.xml文件中添加必要的监听器和Servlet。内容如下所示：

<?xml version="1.0" encoding="UTF-8"?>
<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/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
	version="3.0">
	<display-name>Spring Learn</display-name>
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>

	<servlet>
		<servlet-name>dispatcher</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>classpath*:/servlet/*.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>dispatcher</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>
</web-app>

注：重点提示一下， servlet-mapping 中只能填写 “/” ，不能填写 “/*” 。否则请求时会提示找不到映射的路径。

4. 添加一个控制器，该控制类采用@RestController. 或者在方法上添加，@ResponesBody. 意图告诉分发器，不要尝试将该返回结果转为html视图，而是根据请求类型，采用消息转换，如转成： json格式。直接封住到放回体中。代码如下：

/**
* @Project Spring 
* @author Xiaowentao
* @Time 2016年7月22日
*/
package tom.spring.controller;

import java.util.ArrayList;
import java.util.List;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class UserManagerController {
	
	@RequestMapping("/messages")
	public List<String> getMessage(){
		
		List<String> result = new  ArrayList<String>(7);
	
		for(int i=0; i<7; i++){
			result.add("Tom "+i);
		}
		return result;
	}
}

当然为了丰富操作。可以在Controller中添加数据库查询类。

添加通过浏览器访问 /messages 可以看到反问的结果为json数组。

转载于:https://my.oschina.net/TomXiao/blog/716414