閱讀本文需要又一定的sping基礎，最起碼要成功的運行過一個SpringMvc項目。
在傳統的Spring項目中，我們要寫一堆的XML文件。而這些XML文件格式要求又很嚴格，很不便于開發。而網上所謂的0配置，并不是純粹的0配置，還是要寫一些xml配置，只是用了幾個@Service，@Controller注解而已。
在這里，我講介紹一種新的配置方式，一行XML代碼都不需要，什么web.xml,Application-context.xml，Beans.xml，統統去死吧！
首先建立一個Maven項目，Packageing方式為war，項目結構為標準Maven WebApp結構。
pom文件如下（很多依賴都沒用，懶得去掉了）：
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<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>com.csonezp</groupId> <artifactId>springdemo</artifactId> <packaging>war</packaging> <version>1.0-SNAPSHOT</version> <name>dataplatform Maven Webapp</name> <url>http://maven.apache.org</url> <properties> <spring.version>4.0.1.RELEASE</spring.version> </properties> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.11</version> </dependency> <!-- Spring dependencies --> <dependency> <groupId>asm</groupId> <artifactId>asm-commons</artifactId> <version>2.2.3</version> </dependency> <dependency> <groupId>asm</groupId> <artifactId>asm</artifactId> <version>2.2.3</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-orm</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-expression</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>cglib</groupId> <artifactId>cglib</artifactId> <version>2.2.2</version> </dependency> <!-- Servlet API, JSTL --> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.0.1</version> <scope>provided</scope> </dependency> <dependency> <groupId>jstl</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <dependency> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-core-asl</artifactId> <version>1.8.4</version> </dependency> <dependency> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-mapper-asl</artifactId> <version>1.8.4</version> </dependency> <dependency> <groupId>c3p0</groupId> <artifactId>c3p0</artifactId> <version>0.9.1.2</version> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.8</version> </dependency> <dependency> <groupId>org.json</groupId> <artifactId>json</artifactId> <version>20090211</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.6</version> </dependency> <dependency> <groupId>spy</groupId> <artifactId>spymemcached</artifactId> <version>2.6</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.6.6</version> </dependency> </dependencies> <build> <finalName>dataplatform</finalName> </build></project> |
這個時候，就該進行Spring配置了。按傳統方式來的話，首先要去web.xml寫一堆配置，然后建立個管理beab的Beans.xml，管理spring mvc 的xml，再寫一坨一坨Bean。就是先進一點的（也就是很多人說的0配置），也就是自己的業務Bean不用寫進xml了，還是很麻煩。
而我這里講的方式，則是完全不修改任何web.xml代碼，不寫一行XML代碼的方式。
首先，在項目立建立一個Config.java文件：
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/** * Created by zhangpeng on 16-3-22. * 取代Beans.xml，純注解配置各種BEAN */@Configuration@ComponentScan("com.csonezp")@EnableWebMvcpublic class Config { /** * jsp視圖解析器的bean * @return */ @Bean public UrlBasedViewResolver setupViewResolver() { UrlBasedViewResolver resolver = new UrlBasedViewResolver(); resolver.setPrefix("/WEB-INF/"); resolver.setSuffix(".jsp"); resolver.setViewClass(JstlView.class); return resolver; } /** * 配置數據源 * @return */ @Bean(name = "dataSource") public ComboPooledDataSource getDataSource() { try { ComboPooledDataSource dataSource = new ComboPooledDataSource(); dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/mfdb"); dataSource.setDriverClass("com.mysql.jdbc.Driver"); dataSource.setUser("root"); dataSource.setPassword("zp1228"); dataSource.setMaxPoolSize(75); return dataSource; } catch (Exception e) { return null; } }} |
@Configuration注解就是告訴Spring這個是一個配置文件類，這里配置的Bean要交給Spring去管理。這個就是用來取代Beans.xml這種文件的。
@ComponentScan("com.csonezp")這個注解就是配置包掃描用的，不必多說了
@EnableWebMvc ，啟用Spring MVC支持
這里面配置了兩個Bean，第一個就是JSP的視圖解析器，第二個則是配置了一個數據源。這些都可以對應到XML文件里面去的。找一個傳統Spring項目，用xml文件對比著我這個類去看，會對這種配置方式有更深的了解。
下面要建立一個WebInitializer類繼承WebApplicationInitializer，在這里添加一個servlet。這一步是用來取代在web.xml中添加servlet的步驟
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import org.springframework.web.WebApplicationInitializer;import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;import org.springframework.web.servlet.DispatcherServlet;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.ServletRegistration.Dynamic;public class WebInitializer implements WebApplicationInitializer { public void onStartup(ServletContext servletContext) throws ServletException { AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext(); ctx.register(Config.class); ctx.setServletContext(servletContext); Dynamic servlet = servletContext.addServlet("dispatcher", new DispatcherServlet(ctx)); servlet.addMapping("/"); servlet.setLoadOnStartup(1); } } |
這樣就OK啦！讓我們寫一些代碼來測試一下吧！
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import org.springframework.stereotype.Service;/** * Created by zhangpeng on 16-3-22. */@Servicepublic class HelloService { public String getHello(String name) { return name + ",Hello!"; }} |
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import com.guduo.dataplatform.service.HelloService;import com.guduo.dataplatform.service.MovieService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.ui.ModelMap;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;/** * Created by zhangpeng on 16-3-22. */@Controller@RequestMapping("/test")public class TestController { @Autowired HelloService helloService; @Autowired MovieService movieService; @RequestMapping("/hello") public String sayHello(@RequestParam("name") String name, ModelMap model) { model.put("hello", helloService.getHello(name)); return "hello"; }} |
一個service，一個controller。
啟動項目，在瀏覽器中輸入地址http://localhost:8080/dp/test/hello?name=sss
頁面顯示sss,Hello!
完工！
額，忘了演示Confgig里配置的bean如何使用了。其實和XML里的一樣。這里拿一個DAO做演示吧，這里就注入了我們在config里配置的那個數據源
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@Repositorypublic class MoviePlayIncDao { private DataSource dataSource; private JdbcTemplate jdbcTemplateObject; @Autowired public void setDataSource(DataSource dataSource) { this.dataSource = dataSource; this.jdbcTemplateObject = new JdbcTemplate(dataSource); } public List<MoviePlayIncreament> getMoviePlayInc(int movieId) { try { String SQL = "select * from movieplayincreament where movieid=?"; List<MoviePlayIncreament> list = jdbcTemplateObject.query(SQL, new MoviePlayIncMapper(), new Object[]{movieId}); return list; } catch (Exception e) { return null; } }} |
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：http://www.cnblogs.com/csonezp/p/5315725.html
