SpringMVC4.X的基本配置

1.静态资源的映射

新增加配置配置类继承WebMvcConfigurerAdapter,并实现其addResourceHandlers方法

2.拦截器的配置

新增加配置配置类继承WebMvcConfigurerAdapter，实现addInterceptors方法。并拦截器类，继承HandlerInterceptorAdapter类

3.全局异常处理@ControllerAdvice

下面为代码实现

一：配置类

import java.util.List;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.scheduling.annotation.EnableScheduling;
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.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.PathMatchConfigurer;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;

import com.wisely.highlight_springmvc4.interceptor.DemoInterceptor;
import com.wisely.highlight_springmvc4.messageconverter.MyMessageConverter;

@Configuration
@EnableWebMvc// 1开启SpringMVC支持，若无此配置，重写WebMvcConfigrerAdapter方法无效
@EnableScheduling
@ComponentScan("com.flysun")
public class MyMvcConfig extends WebMvcConfigurerAdapter {// 2重写其方法可对SpringMVC进行配置
        //静态资源映射
	@Bean
	public InternalResourceViewResolver viewResolver() {
		InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
		viewResolver.setPrefix("/WEB-INF/classes/views/");
		viewResolver.setSuffix(".jsp");
		viewResolver.setViewClass(JstlView.class);
		return viewResolver;
	}
        //addResourceLocations指的是文件放置的路径，addResourceHander指的是对外暴露的访问路劲
	@Override
	public void addResourceHandlers(ResourceHandlerRegistry registry) {

		registry.addResourceHandler("/assets/**").addResourceLocations(
				"classpath:/assets/");

	}

	@Bean
	// 配置拦截器的bean
	public DemoInterceptor demoInterceptor() {
		return new DemoInterceptor();
	}

	@Override
	public void addInterceptors(InterceptorRegistry registry) {// 重写addInterceptors方法，注册自己的拦截器
		registry.addInterceptor(demoInterceptor());
	}

	@Override
	public void addViewControllers(ViewControllerRegistry registry) {
		registry.addViewController("/index").setViewName("/index");
		registry.addViewController("/toUpload").setViewName("/upload");
		registry.addViewController("/converter").setViewName("/converter");
		registry.addViewController("/sse").setViewName("/sse");
		registry.addViewController("/async").setViewName("/async");
	}

	 @Override
	 public void configurePathMatch(PathMatchConfigurer configurer) {
	 configurer.setUseSuffixPatternMatch(false);
	 }
         //文件上传时的文件解析
	@Bean
	public MultipartResolver multipartResolver() {
		CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
		multipartResolver.setMaxUploadSize(1000000);
		return multipartResolver;
	}
	
	@Override
    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.add(converter());
    }
	
	@Bean 
	public MyMessageConverter converter(){
		return new MyMessageConverter();
	}

	

}

二：自定义拦截器类

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

public class DemoInterceptor extends HandlerInterceptorAdapter {//继承此类，并覆写其方法

	@Override
	public boolean preHandle(HttpServletRequest request, //请求之前执行
			HttpServletResponse response, Object handler) throws Exception {
		long startTime = System.currentTimeMillis();
		request.setAttribute("startTime", startTime);
		return true;
	}

	@Override
	public void postHandle(HttpServletRequest request, //请求完成之后执行
			HttpServletResponse response, Object handler,
			ModelAndView modelAndView) throws Exception {
		long startTime = (Long) request.getAttribute("startTime");
		request.removeAttribute("startTime");
		long endTime = System.currentTimeMillis();
		System.out.println("本次请求处理时间为:" + new Long(endTime - startTime)+"ms");
		request.setAttribute("handlingTime", endTime - startTime);
	}

}

三：@ControllerAdvice与全局异常处理类

import org.springframework.ui.Model;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.InitBinder;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.context.request.WebRequest;
import org.springframework.web.servlet.ModelAndView;

@ControllerAdvice //1声明一个控制器建言,这里面设置的是所有控制器的全局配置，其中下面的三个注解（@ExceptionHandler,@ModelAttribute,@InitBinder）只对加了@RequestMapping的控制器里的方法有效
public class ExceptionHandlerAdvice { 

	@ExceptionHandler(value = Exception.class)//2定义全局异常处理，拦截所有的Exception
	public ModelAndView exception(Exception exception, WebRequest request) {
		ModelAndView modelAndView = new ModelAndView("error");// error页面
		modelAndView.addObject("errorMessage", exception.getMessage());
		return modelAndView;
	}

	@ModelAttribute //3所有注解了@RequestMapping的方法都可以获得下面的属性
	public void addAttributes(Model model) {
		model.addAttribute("msg", "额外信息"); 
	}

	@InitBinder 
	public void initBinder(WebDataBinder webDataBinder) {
		webDataBinder.setDisallowedFields("id"); //5忽略所有请求request中的id参数
	}
}

四：运行控制器

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;

import com.wisely.highlight_springmvc4.domain.DemoObj;

@Controller
public class AdviceController {
	@RequestMapping("/advice")
	public String getSomething(@ModelAttribute("msg") String msg,DemoObj obj){//1获取全局配置中的model设置的属性msg
		
		throw new IllegalArgumentException("非常抱歉，参数有误/"+"来自@ModelAttribute:"+ msg);
	}

}

五:error.jsp页面：

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ 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>@ControllerAdvice Demo</title>
</head>
<body>
	${errorMessage}
</body>
</html>

运行结果如下：

六：文件上传

文件上传的页面如下：

<%@ 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>upload page</title>

</head>
<body>


<div class="upload">
	<form action="upload" enctype="multipart/form-data" method="post">
		<input type="file" name="file"/><br/>
		<input type="submit" value="上传">
	</form>
</div>


</body>
</html>

文件上传的controller

import java.io.File;
import java.io.IOException;

import org.apache.commons.io.FileUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;

@Controller
public class UploadController {
	
	@RequestMapping(value = "/upload",method = RequestMethod.POST)
	public @ResponseBody String upload(MultipartFile file) {//1
		
			try {
				FileUtils.writeByteArrayToFile(new File("d:/upload/"+file.getOriginalFilename()),
						file.getBytes()); //2
				return "ok";
			} catch (IOException e) {
				e.printStackTrace();
				return "wrong";
			}
			
		
	}

}

上传成功页面：

SpringMVC4.X的基本配置

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