在SpringMVC框架下实现文件的 上传和 下载
在eclipse中的javaEE环境下:导入必要的架包
web.xml的配置文件:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns: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;
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="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/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd"> <!-- 配置自动扫描的包 -->
<context:component-scan base-package="com.atguigu.springmvc"></context:component-scan> <!-- 配置视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/"></property>
<property name="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-->
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- 默认的字符编码 -->
<property name="defaultEncoding" value="UTF-8"></property>
<!-- 上传文件的大小 ,最大上传大小-->
<property name="maxUploadSize" value="1024000"></property>
</bean>
</beans>
handler类方法:实现文件的上传和下载的方法
@Controller
public class SpringMVCTest { @Autowired
private EmployeeDao employeeDao;
//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")
public ResponseEntity<byte[]> testResponseEntity(HttpSession session) throws IOException{ byte[] body=null;
ServletContext servletContext=session.getServletContext();
///files/abc.txt:所要下载文件的地址
InputStream in=servletContext.getResourceAsStream("/files/abc.txt");
body=new byte[in.available()];
in.read(body); HttpHeaders headers=new HttpHeaders();
//响应头的名字和响应头的值
headers.add("Content-Disposition", "attachment;filename=abc.txt"); HttpStatus statusCode=HttpStatus.OK; ResponseEntity<byte[]> response=new ResponseEntity<byte[]>(body, headers, statusCode);
return response;
}
//文件上传,
@RequestMapping("/testFileUpload")
public String testFileUpload(@RequestParam("desc") String desc,
@RequestParam("file") MultipartFile file) throws IOException{
System.out.println("desc:"+desc);
System.out.println("OriginalFilename"+file.getOriginalFilename());
System.out.println("InputStream"+file.getInputStream());
return "success";
}
}
jsp页面:index.jsp:
<%@ 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>Insert title here</title>
</head>
<body> <center>
<!-- 文件上传的表单 -->
<form action="testFileUpload" method="post" enctype="multipart/form-data">
File:<input type="file" name="file"/>
Desc:<input type="text" name="desc"/>
<input type="submit" value="Submit"/>
</form>
<br><br> <!-- 文件的下载 -->
<a href="testResponseEntity">Test ResponseEntity</a> </center> </body>
</html>
success.jsp页面:显示文件上传成功
<%@ 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>Insert title here</title>
</head>
<body> <h3>Success page</h3> </body>
</html>
最新文章
- 关于scale和zoom的区别
- IOS 开发中 Whose view is not in the window hierarchy 错误的解决办法
- Spring注入方式及注解配置
- CentOS6.5 本地源搭建Ceph
- 自定义控件TextView
- js的动态加载、缓存、更新以及复用
- 遇到double 数目过大,转String变成科学计数法
- 浅析@Deprecated
- Mono For Android的项目发布
- CTE Recursion Performance
- JAVA中的Transient
- django无法加载admin的静态内容的问题(Centos7+Nginx+uwsgi环境下)
- 201521123093 java 第二周学习总结
- Spring-day03
- Day10 Python网络编程 Socket编程
- vmware安装centos问题
- 使用clear来清除localStorage保存对象的全部数据
- cocos2d-x retain和release倒底怎么玩?
- cookie(2)
- Linux下解压缩命令