基于配置文件的web项目维护起来可能会更方便，但是有时候我们会有一些特殊的需求，比如防止客户胡乱更改配置，这时候我们需要给配置隐藏到代码中。
1.创建一个动态web项目（无需web.xml）
2.右键项目添加几个package: com.easyweb.config (保存项目配置) com.easyweb.controller （保存springMvc controller）
3.在 com.easyweb.config 新建一个类 WebApplicationStartup ，这个类实现WebApplicationInitializer 接口，是项目的入口，作用类似于web.xml，具体代码如下：
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<code class="hljs" java="">package com.easyweb.config;import javax.servlet.MultipartConfigElement;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.ServletRegistration.Dynamic;import org.springframework.web.WebApplicationInitializer;import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;import org.springframework.web.servlet.DispatcherServlet;/** * 服务器启动入口类 * * @author Administrator * */public class WebApplicationStartup implements WebApplicationInitializer { private static final String SERVLET_NAME = Spring-mvc; private static final long MAX_FILE_UPLOAD_SIZE = 1024 * 1024 * 5; // 5 Mb private static final int FILE_SIZE_THRESHOLD = 1024 * 1024; // After 1Mb private static final long MAX_REQUEST_SIZE = -1L; // No request size limit /** * 服务器启动调用此方法，在这里可以做配置 作用与web.xml相同 */ @Override public void onStartup(ServletContext servletContext) throws ServletException { // 注册springMvc的servlet this.addServlet(servletContext); // 注册过滤器 // servletContext.addFilter(arg0, arg1) // 注册监听器 // servletContext.addListener(arg0); } /** * 注册Spring servlet * * @param servletContext */ private void addServlet(ServletContext servletContext) { // 构建一个application context AnnotationConfigWebApplicationContext webContext = createWebContext(SpringMVC.class, ViewConfiguration.class); // 注册spring mvc 的 servlet Dynamic dynamic = servletContext.addServlet(SERVLET_NAME, new DispatcherServlet(webContext)); // 添加springMVC 允许访问的Controller后缀 dynamic.addMapping(*.html, *.ajax, *.css, *.js, *.gif, *.jpg, *.png); // 全部通过请用 “/” // dynamic.addMapping(/); dynamic.setLoadOnStartup(1); dynamic.setMultipartConfig(new MultipartConfigElement(null, MAX_FILE_UPLOAD_SIZE, MAX_REQUEST_SIZE, FILE_SIZE_THRESHOLD)); } /** * 通过自定义的配置类来实例化一个Web Application Context * * @param annotatedClasses * @return */ private AnnotationConfigWebApplicationContext createWebContext(Class<!--?-->... annotatedClasses) { AnnotationConfigWebApplicationContext webContext = new AnnotationConfigWebApplicationContext(); webContext.register(annotatedClasses); return webContext; }}</code> |
4.在com.easyweb.config 下添加类 SpringMVC 继承 WebMvcConfigurerAdapter，这个类的作用是进行SpringMVC的一些配置，代码如下：
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<code class="hljs" java="">package com.easyweb.config;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.Configuration;import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;import org.springframework.web.servlet.config.annotation.EnableWebMvc;import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;@Configuration@EnableWebMvc//指明controller所在的包名@ComponentScan(basePackages = {com.easyweb.controller})public class SpringMVC extends WebMvcConfigurerAdapter { /** * 非必须 */ @Override public void configureDefaultServletHandling(final DefaultServletHandlerConfigurer configurer) { configurer.enable(); } /** * 如果项目的一些资源文件放在/WEB-INF/resources/下面 * 在浏览器访问的地址就是类似：https://host:port/projectName/WEB-INF/resources/xxx.css * 但是加了如下定义之后就可以这样访问： * 非必须 */ @Override public void addResourceHandlers(final ResourceHandlerRegistry registry) { registry.addResourceHandler(/resources/**/*).addResourceLocations(/WEB-INF/resources/); }}</code> |
5.添加view配置文件com.easyweb.config下新建类ViewConfiguration，里面可以根据自己的需要定义视图拦截器：
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<code avrasm="" class="hljs">package com.easyweb.config;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.web.servlet.ViewResolver;import org.springframework.web.servlet.view.JstlView;import org.springframework.web.servlet.view.UrlBasedViewResolver;import org.springframework.web.servlet.view.tiles2.TilesConfigurer;import org.springframework.web.servlet.view.tiles2.TilesView;@Configurationpublic class ViewConfiguration { @Bean public ViewResolver urlBasedViewResolver() { UrlBasedViewResolver viewResolver; viewResolver = new UrlBasedViewResolver(); viewResolver.setOrder(2); viewResolver.setPrefix(/WEB-INF/); viewResolver.setSuffix(.jsp); viewResolver.setViewClass(JstlView.class); // for debug envirment viewResolver.setCache(false); return viewResolver; } @Bean public ViewResolver tilesViewResolver() { UrlBasedViewResolver urlBasedViewResolver = new UrlBasedViewResolver(); urlBasedViewResolver.setOrder(1); urlBasedViewResolver.setViewClass(TilesView.class); //urlBasedViewResolver. return urlBasedViewResolver; } @Bean public TilesConfigurer tilesConfigurer() { TilesConfigurer tilesConfigurer = new TilesConfigurer(); tilesConfigurer.setDefinitions(new String[] { classpath:tiles.xml }); return tilesConfigurer; }}</code> |
6.本例中还用了tiles视图解析器，替换了原始的include方式