Spring环境搭建之：Spring MVC、文件上传下载

相关jar包：
导入文件上传下载组件的jar包
commons-fileupload-1.3.jar
commons-io-2.4.jar

Spring MVC中使用JstlView时需要添加的包
jstl-1.1.2.jar
standard-1.1.2.jar

1.整体架构

2.web.xml文件配置DispatcherServlet拦截所有的请求

01

<servlet>

02	<servlet-name>chapter2</servlet-name>

03	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

04	<init-param>

05	<param-name>contextConfigLocation</param-name>

06	<param-value>/WEB-INF/conf/chapter2-servlet.xml</param-value>

07	</init-param>

08	<load-on-startup>1</load-on-startup>

09	</servlet>

10

11	<servlet-mapping>

12	<servlet-name>chapter2</servlet-name>

13	<url-pattern>/</url-pattern>

14	</servlet-mapping>

DispatcherServlet默认会加载WEB-INF/[DispatcherServlet的servlet-name]-servlet.xml配置文件。
这里的[servlet-name]为chapter2,就一定要添加一个chapter2-servlet.xml文件

这里该文件不是在默认位置WEB-INF下，而是在WEB-INF/conf/下，就需要通过<init-param>指定其配置路径
contextConfigLocation

1	<init-param>

2	<param-name>contextConfigLocation</param-name>

3	<param-value>/WEB-INF/conf/chapter2-servlet.xml</param-value>

4	</init-param>

<load-on-startup>指定服务器启动时DispatcherServlet初始化的优先级，数字越小越优先初始化。

3.xxx-servlet.xml文件的配置

01	<?xmlversion="1.0"encoding="UTF-8"?>

02	<beansxmlns="http://www.springframework.org/schema/beans"

03	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

04	xmlns:context="http://www.springframework.org/schema/context"

05	xmlns:mvc="http://www.springframework.org/schema/mvc"

06	xsi:schemaLocation="

07	http://www.springframework.org/schema/beans

08	http://www.springframework.org/schema/beans/spring-beans.xsd

09	http://www.springframework.org/schema/context

10	http://www.springframework.org/schema/context/spring-context.xsd

11	http://www.springframework.org/schema/mvc

12	http://www.springframework.org/schema/mvc/spring-mvc.xsd">

13

14

<!--

15	启动SpringMVC的注解功能，它会自动注册HandlerMapping、

16	HandlerAdapter、ExceptionResolver的相关实例

17

-->

18	<mvc:annotation-driven/>

19	<mvc:default-servlet-handler/>

20	<!-- DispatcherServlet会过滤所有的请求，这样请求静态资源时会出问题，加上该配置后，请求resources下面的静态资源时，url不会被过滤 -->

21	<mvc:resourcesmapping="/resources/**"location="/resources/"/>

22	<!-- 扫描添加了@Controller等注解的类 -->

23	<context:component-scanbase-package="cn.javass.chapter2.web.controller"/>

24

25

<!--

26	ViewResolver 视图解析器，对处理器返回的ModelAndView进行解析，

27	返回到相应的视图页面， 以UploadController为例，上传成功后经过解析会

28	返回/WEB-INF/jsp/success.jsp视图页面

29

-->

30	<beanclass="org.springframework.web.servlet.view.InternalResourceViewResolver">

31	<propertyname="viewClass"value="org.springframework.web.servlet.view.JstlView"/>

32	<propertyname="prefix"value="/WEB-INF/jsp/"/>

33	<propertyname="suffix"value=".jsp"/>

34

</bean>

35	<!-- 文件解析器 -->

36	<beanname="multipartResolver"class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

37	<propertyname="defaultEncoding"value="utf-8"></property>

38	<propertyname="maxUploadSize"value="10485760000"></property>

39	<propertyname="maxInMemorySize"value="40960"></property>

40

</bean>

41

</beans>

4.Controller控制器

01	package cn.javass.chapter2.web.controller;

02

03	import java.io.File;

04	import java.io.IOException;

05	import java.util.Calendar;

06	import java.util.Date;

07

08	import javax.servlet.http.HttpServletRequest;

09

10	import org.springframework.stereotype.Controller;

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

12	import org.springframework.web.bind.annotation.RequestParam;

13	import org.springframework.web.multipart.commons.CommonsMultipartFile;

14

15	@Controller

16	@RequestMapping("/file")

17	public classUploadController {

18

19	@RequestMapping("/upload")

20	publicString upload(@RequestParamCommonsMultipartFile file,

21	HttpServletRequest request)throws IllegalStateException,

22	IOException {

23	// isEmpty()返回上传的文件是否为空，有2种情况： 1、文件表单中是否选择了文件 2、选择的文件是否有内容

24	if(!file.isEmpty()) {

25	String fileName = file.getOriginalFilename();

26	fileName =new Date().getTime() + fileName;

27	System.out.println("文件名----------->"+ fileName);

28	String extension = fileName

29	.substring(fileName.lastIndexOf(".") +1);

30	if(extension != null

31	&& (extension.equalsIgnoreCase("xls") || extension

32	.equalsIgnoreCase("xlsx"))) {

33	finalString TEMP_FILE_PATH = request.getServletContext()

34	.getRealPath("/WEB-INF/upload");

35	finalString FILE_SEPARATOR = System.getProperties()

36	.getProperty("file.separator");

37	String filePath = TEMP_FILE_PATH + FILE_SEPARATOR + fileName;

38	File f =new File(filePath);

39	// 2种文件拷贝的方法

40	file.transferTo(f);

41	// FileUtils.copyInputStreamToFile(file.getInputStream(), f);

42

43	// 删除保存时间超过2天的临时文件

44	deleteTempFile(2, TEMP_FILE_PATH);

45

46	return"success";

47

}else {

48	System.out.println("文件格式不对，请上传xls或xlsx格式");

49	return"fail";

50

}

51

} else {

52	return"fail";

53

}

54

}

55

56	@RequestMapping("/toupload")

57	publicString toUpload() {

58	return"upload";

59

}

60

61

/**

62	* 删除指定目录path下，文件存在时间超过指定day天数的文件

63

*

64	* @param day

65	*            所要清理的目标文件已经存在的天数

66	* @param path

67	*            所要清理文件的文件夹路径

68

*/

69

70	privatevoid deleteTempFile(intday, String path) {

71	Date date;

72	Date dateNow;

73	Calendar cal = Calendar.getInstance();

74	Calendar calNow = Calendar.getInstance();

75	File filepath =new File(path);

76	File[] files;

77	if(filepath.exists()) {

78	if(filepath.isDirectory()) {

79	files = filepath.listFiles();

80	for(int i = 0; i < files.length; i++) {

81	date =new Date(files[i].lastModified());

82	dateNow =new Date();

83	cal.setTime(date);

84	calNow.setTime(dateNow);

85	intdec = calNow.get(Calendar.DAY_OF_YEAR)

86	- cal.get(Calendar.DAY_OF_YEAR);

87	// 删除指定日期的文件

88	if(dec >= day) {

89	files[i].delete();

90

}

91

}

92

}

93

}

94

}

95

}

@Controller 指定该类为控制器，可以拦截url请求，也可以直接使用HttpServletRequest/Response
@RequestMapping 的value指定请求映射的url
@RequestParam 可以取出请求时传输的参数