Spring MVC的定制配置需要配置类实现WebMvcConfigurer接口，并在配置类使用@EnableWebMvc注解来开启对Spring MVC的配置支持，这样开发者就可以重写接口方法完成常用的配置。
静态资源配置 应用的静态资源（CSS、JS、图片）等需要直接访问，这时需要开发者在配置类重写public void addResourceHandlers(ResourceHandlerRegistry registry)接口方法来实现。 /** * 配置静态资源 */ @Override public void addResourceHandlers(ResourceHandlerRegistry registry) { registry.addResourceHandler("/html/**").addResourceLocations("/html/"); //addResourceHandler指的是对外暴露的访问路径 //addResourceLocations指的是静态资源存放的位置 }
拦截器配置 Spring的拦截器（Interceptor）实现对每一个请求处理前后进行相关的业务处理，类似于Servlet的过滤器（Filter）。开发者如需要自定义Spring的拦截器，可以通过以下两个步骤完成： 1．创建自定义拦截器类 2．配置拦截器
创建自定义拦截器类 自定义拦截器类需要实现HandlerInterceptor接口或继承HandlerInterceptorAdapter类，示例代码如下： public class MyInteceptor implements HandlerInterceptor{ /** * 重写preHandle方法在请求发生前执行 */ @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System.out.println("preHandle方法在请求发生前执行"); return true; } /** * 重写postHandle方法在请求完成后执行 */ @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { System.out.println("postHandle方法在请求完成后执行"); } }
配置拦截器 在配置类中，需要首先配置拦截器Bean，然后重写addInterceptors方法注册拦截器，示例代码如下： /** * 配置拦截器Bean */ @Bean public MyInteceptor myInteceptor() { return new MyInteceptor(); } /** * 重写addInterceptors方法注册拦截器 */ @Override public void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(myInteceptor()); }
文件上传配置 文件上传是一个应用中经常使用的功能，Spring MVC通过配置一个MultipartResolver来上传文件。在Spring MVC的控制器中，可以通过MultipartFile myfile来接收单个文件上传，通过List<MultipartFile> myfiles来接收多个文件上传。 由于Spring MVC框架的文件上传是基于commons-fileupload组件的文件上传。因此，需要将commons-fileupload组件相关的jar（commons-fileupload.jar和commons-io.jar）拷贝到Spring MVC应用的WEB-INF/lib目录下。 Commons是Apache开放源代码组织中的一个Java子项目，该项目包括文件上传、命令行处理、数据库连接池、XML配置文件处理等模块。fileupload就是其中用来处理基于表单的文件上传的子项目，commons-fileupload组件性能优良，并支持任意大小文件的上传。
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> <form action="${pageContext.request.contextPath }/multifile" method="post" enctype="multipart/form-data"> 选择文件1:<input type="file" name="myfile"> <br> 文件描述1:<input type="text" name="description"> <br> 选择文件2:<input type="file" name="myfile"> <br> 文件描述2:<input type="text" name="description"> <br> 选择文件3:<input type="file" name="myfile"> <br> 文件描述3:<input type="text" name="description"> <br> <input type="submit" value="提交"> </form> </body> </html>
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> <table> <tr> <td>详情</td><td>文件名</td> </tr> <!-- 同时取两个数组的元素 --> <c:forEach items="${multiFileDomain.description}" var="description" varStatus="loop"> <tr> <td>${description}</td> <td>${multiFileDomain.myfile[loop.count-1].originalFilename}</td> </tr> </c:forEach> <!-- fileDomain.getMyfile().getOriginalFilename() --> </table> </body> </html>
package pojo; import java.util.List; import org.springframework.web.multipart.MultipartFile; public class MultiFileDomain { private List<String> description; private List<MultipartFile> myfile; public List<String> getDescription() { return description; } public void setDescription(List<String> description) { this.description = description; } public List<MultipartFile> getMyfile() { return myfile; } public void setMyfile(List<MultipartFile> myfile) { this.myfile = myfile; } }
package config; 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; public class WebConfig implements WebApplicationInitializer{ @Override public void onStartup(ServletContext arg0) throws ServletException { AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext(); ctx.register(SpringMVCConfig.class);//注册Spring MVC的Java配置类SpringMVCConfig ctx.setServletContext(arg0);//和当前ServletContext关联 /** * 注册Spring MVC的DispatcherServlet */ Dynamic servlet = arg0.addServlet("dispatcher", new DispatcherServlet(ctx)); servlet.addMapping("/"); servlet.setLoadOnStartup(1); } }
package config; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.ComponentScan; import org.springframework.context.annotation.Configuration; import org.springframework.web.multipart.MultipartResolver; import org.springframework.web.multipart.commons.CommonsMultipartResolver; import org.springframework.web.servlet.config.annotation.EnableWebMvc; import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurer; import org.springframework.web.servlet.view.InternalResourceViewResolver; @Configuration @EnableWebMvc @ComponentScan(basePackages = {"controller","service"}) public class SpringMVCConfig implements WebMvcConfigurer { /** * 配置视图解析器 */ @Bean public InternalResourceViewResolver getViewResolver() { InternalResourceViewResolver viewResolver = new InternalResourceViewResolver(); viewResolver.setPrefix("/WEB-INF/jsp/"); viewResolver.setSuffix(".jsp"); return viewResolver; } /** * 配置静态资源 */ @Override public void addResourceHandlers(ResourceHandlerRegistry registry) { registry.addResourceHandler("/html/**").addResourceLocations("/html/"); //addResourceHandler指的是对外暴露的访问路径 //addResourceLocations指的是静态资源存放的位置 } /** * MultipartResolver配置 */ @Bean public MultipartResolver multipartResolver() { CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(); //设置上传文件的最大值，单位为字节 multipartResolver.setMaxUploadSize(5400000); //设置请求的编码格式，默认为iso-8859-1 multipartResolver.setDefaultEncoding("UTF-8"); return multipartResolver; } }
package controller; import java.io.File; import java.util.List; import javax.servlet.http.HttpServletRequest; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.ModelAttribute; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.multipart.MultipartFile; import pojo.MultiFileDomain; @Controller public class MutiFilesController { // 得到一个用来记录日志的对象，这样打印信息时，能够标记打印的是哪个类的信息 private static final Log logger = LogFactory.getLog(MutiFilesController.class); /** * 多文件上传 */ @RequestMapping("/multifile") public String multiFileUpload(@ModelAttribute MultiFileDomain multiFileDomain, HttpServletRequest request){ String realpath = request.getServletContext().getRealPath("uploadfiles"); //上传到eclipse-workspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/ch2_6/uploadfiles File targetDir = new File(realpath); if(!targetDir.exists()){ targetDir.mkdirs(); } List<MultipartFile> files = multiFileDomain.getMyfile(); for (int i = 0; i < files.size(); i++) { MultipartFile file = files.get(i); String fileName = file.getOriginalFilename(); File targetFile = new File(realpath,fileName); //上传 try { file.transferTo(targetFile); } catch (Exception e) { e.printStackTrace(); } } logger.info("成功"); return "showMulti"; } }
