在eclipse中的javaee环境下：导入必要的架包
web.xml的配置文件：
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<?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" rel="external nofollow" >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>
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