在SpringMVC框架下实现文件的上传和下载示例
在eclipse中的javaEE环境下：导入必要的架包
web.xml的配置文件：
<?xmlversion="1.0"encoding="UTF-8"?> <web-appxmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID"version="2.5"> <!--配置SpringMVC的DispatcherServlet--> <servlet> <servlet-name>springDispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springDispatcherServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <!--配置HiddenHttpMethodFilter:把POST请求转为DELETE、PUT请求--> <filter> <filter-name>HiddenHttpMethodFilter</filter-name> <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class> </filter> <filter-mapping> <filter-name>HiddenHttpMethodFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
spring的bean的配置文件springmvc.xml;
<?xmlversion="1.0"encoding="UTF-8"?> <beansxmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/mvchttp://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-4.0.xsd"> <!--配置自动扫描的包--> <context:component-scanbase-package="com.atguigu.springmvc"></context:component-scan> <!--配置视图解析器--> <beanclass="org.springframework.web.servlet.view.InternalResourceViewResolver"> <propertyname="prefix"value="/WEB-INF/views/"></property> <propertyname="suffix"value=".jsp"></property> </bean> <!-- default-servlet-handler将在SpringMVC上下文中定义一个DefaultServletHttpRequestHandler, 它会对进入DispatcherServlet的请求进行筛查,如果发现是没有经过映射的请求,就将该请求交由WEB应用服务器默认的 Servlet处理.如果不是静态资源的请求，才由DispatcherServlet继续处理 一般WEB应用服务器默认的Servlet的名称都是default. 若所使用的WEB服务器的默认Servlet名称不是default，则需要通过default-servlet-name属性显式指定 --> <mvc:default-servlet-handler/> <!--一般都会配置这个<mvc:annotation-driven></mvc:annotation-driven>， 由于。。。requestmapping请求实现不了，使用这个，会使requestmapping请求一定实现 --> <mvc:annotation-driven></mvc:annotation-driven> <!--配置MultipartResolver，即配置文件上传的属性--> <beanid="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <!--默认的字符编码--> <propertyname="defaultEncoding"value="UTF-8"></property> <!--上传文件的大小,最大上传大小--> <propertyname="maxUploadSize"value="1024000"></property> </bean> </beans>
handler类方法：实现文件的上传和下载的方法
@Controller
publicclassSpringMVCTest{
@Autowired
privateEmployeeDaoemployeeDao;
//实现文件的下载
//需要说明的是文件的上传和下载不需要其他配置
@RequestMapping("testResponseEntity")
publicResponseEntity<byte[]>testResponseEntity(HttpSessionsession)throwsIOException{
byte[]body=null;
ServletContextservletContext=session.getServletContext();
///files/abc.txt：所要下载文件的地址
InputStreamin=servletContext.getResourceAsStream("/files/abc.txt");
body=newbyte[in.available()];
in.read(body);
HttpHeadersheaders=newHttpHeaders();
//响应头的名字和响应头的值
headers.add("Content-Disposition","attachment;filename=abc.txt");
HttpStatusstatusCode=HttpStatus.OK;
ResponseEntity<byte[]>response=newResponseEntity<byte[]>(body,headers,statusCode);
returnresponse;
}
//文件上传，
@RequestMapping("/testFileUpload")
publicStringtestFileUpload(@RequestParam("desc")Stringdesc,
@RequestParam("file")MultipartFilefile)throwsIOException{
System.out.println("desc:"+desc);
System.out.println("OriginalFilename"+file.getOriginalFilename());
System.out.println("InputStream"+file.getInputStream());
return"success";
}
}
jsp页面：index.jsp：
<%@pagelanguage="java"contentType="text/html;charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPEhtmlPUBLIC"-//W3C//DTDHTML4.01Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <metahttp-equiv="Content-Type"content="text/html;charset=UTF-8"> <title>Inserttitlehere</title> </head> <body> <center> <!--文件上传的表单--> <formaction="testFileUpload"method="post"enctype="multipart/form-data"> File:<inputtype="file"name="file"/> Desc:<inputtype="text"name="desc"/> <inputtype="submit"value="Submit"/> </form> <br><br> <!--文件的下载--> <ahref="testResponseEntity"rel="externalnofollow">TestResponseEntity</a> </center> </body> </html>
success.jsp页面：显示文件上传成功
<%@pagelanguage="java"contentType="text/html;charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPEhtmlPUBLIC"-//W3C//DTDHTML4.01Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <metahttp-equiv="Content-Type"content="text/html;charset=UTF-8"> <title>Inserttitlehere</title> </head> <body> <h3>Successpage</h3> </body> </html>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。