这是主要使用到的jar 文件是：spring mvc +apache common-fileuplad
第一步：web.xml 文件。【重点是spring mvc的拦截器和相关监听器】
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<?xml version="1.0" encoding="utf-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"
xsi:schemalocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<display-name></display-name>
<!-- spring和mybatis的配置文件 -->
<context-param>
<param-name>contextconfiglocation</param-name>
<param-value>classpath:spring-mybatis.xml</param-value>
</context-param>
<!-- 编码过滤器 -->
<filter>
<filter-name>encodingfilter</filter-name>
<filter-class>org.springframework.web.filter.characterencodingfilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingfilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- spring监听器 -->
<listener>
<listener-class>org.springframework.web.context.contextloaderlistener</listener-class>
</listener>
<!-- 防止spring内存溢出监听器 -->
<listener>
<listener-class>org.springframework.web.util.introspectorcleanuplistener</listener-class>
</listener>
<!-- spring mvc servlet -->
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.dispatcherservlet</servlet-class>
<init-param>
<param-name>contextconfiglocation</param-name>
<param-value>classpath:spring-mvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<!-- 此处可以可以配置成*.do，对应struts的后缀习惯 -->
<url-pattern>/</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>/index.jsp</welcome-file>
</welcome-file-list>
</web-app>
第二步：spring-mvc 配置文件【重点：spring mvc 视图模式，spring mvc 文件上传限定参数，spring mvc 资源拦截管理和其他】
<?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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemalocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
<!-- 自动扫描该包，使springmvc认为包下用了@controller注解的类是控制器 -->
<mvc:annotation-driven />
<mvc:default-servlet-handler/>
<context:annotation-config/>
<context:component-scan base-package="com" />
<!--避免ie执行ajax时，返回json出现下载文件 -->
<bean id="mappingjacksonhttpmessageconverter"
class="org.springframework.http.converter.json.mappingjacksonhttpmessageconverter">
<property name="supportedmediatypes">
<list>
<value>text/html;charset=utf-8</value>
</list>
</property>
</bean>
<!-- 启动springmvc的注解功能，完成请求和注解pojo的映射 -->
<bean
class="org.springframework.web.servlet.mvc.annotation.annotationmethodhandleradapter">
<property name="messageconverters">
<list>
<ref bean="mappingjacksonhttpmessageconverter" /> <!-- json转换器 -->
</list>
</property>
</bean>
<!-- 定义跳转的文件的前后缀 ，视图模式配置-->
<bean class="org.springframework.web.servlet.view.internalresourceviewresolver">
<!-- 这里的配置我的理解是自动给后面action的方法return的字符串加上前缀和后缀，变成一个 可用的url地址 -->
<property name="prefix" value="/backstage/jsp/" />
<property name="suffix" value=".jsp" />
</bean>
<!-- 配置文件上传，如果没有使用文件上传可以不用配置，当然如果不配，那么配置文件中也不必引入上传组件包 -->
<bean id="multipartresolver"
class="org.springframework.web.multipart.commons.commonsmultipartresolver">
<!-- 默认编码 -->
<property name="defaultencoding" value="utf-8" />
<!-- 文件大小最大值 -->
<property name="maxuploadsize" value="10485760000" />
<!-- 内存中的最大值 -->
<property name="maxinmemorysize" value="40960" />
</bean>
<!-- 声明dispatcherservlet不要拦截下面声明的目录 -->
<mvc:resources location="/js/" mapping="/js/**" />
<mvc:resources location="/images/" mapping="/images/**"/>
<mvc:resources location="/css/" mapping="/css/**"/>
<mvc:resources location="/common/" mapping="/common/**"/>
</beans>
第三步：jsp 页面
<%@ page language="java" pageencoding="utf-8"%> <form action="<%=request.getcontextpath()%>/users/add" method="post" enctype="multipart/form-data"> username: <input type="text" name="username"/><br/> nickname: <input type="text" name="nickname"/><br/> password: <input type="password" name="password"/><br/> yourmail: <input type="text" name="email"/><br/> yourfile: <input type="file" name="myfiles"/><br/> <input type="submit" value="添加新用户"/> </form>
第四步：spring mvc 控制器代码
package com.wlsq.controller;
import java.io.file;
import java.io.ioexception;
import java.util.hashmap;
import java.util.list;
import java.util.map;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import org.apache.commons.io.fileutils;
import org.springframework.beans.factory.annotation.autowired;
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.requestparam;
import org.springframework.web.multipart.multipartfile;
import org.springframework.web.servlet.modelandview;
import com.wlsq.model.news;
import com.wlsq.service.iusermapperservice;
import com.wlsq.util.pagination;
@controller
@requestmapping(value="/users")
public class usercontroller {
@autowired
private iusermapperservice userservice;
@requestmapping(value="/userall")
public modelandview searchnews(httpservletrequest request,httpservletresponse response){
modelandview mv = null;
try{
mv = new modelandview();
int pagesize = integer
.parseint(request.getparameter("pagesize") == null ? "10"
: request.getparameter("pagesize"));
int pagenum = integer
.parseint(request.getparameter("pagenum") == null ? "1"
: request.getparameter("pagenum"));
map<string, object> maps = new hashmap<>();
maps.put("pagesize", pagesize);
maps.put("pagenum", (pagenum-1) * pagesize);
list<news> list =userservice.selectallusers(maps);
int count = userservice.selectcountusers();
pagination page = new pagination(count);
page.setcurrentpage(pagenum);
mv.addobject("pnums", page.getpagenumlist());
mv.addobject("currentpage", pagenum);
mv.addobject("pnext_flag", page.nextenable());
mv.addobject("plast_flag", page.lastenable());
page.lastpage();
mv.addobject("last_page", page.getcurrentpage());
mv.addobject("count", count);
mv.addobject("pagecount", page.getpages());
if(list !=null && list.size()>0){
//用户存在
mv.addobject("partners", list);
//设置逻辑视图名，视图解析器会根据该名字解析到具体的视图页面
mv.setviewname("/users/users");
}else{
//用户存在
mv.addobject("partners", list);
//设置逻辑视图名，视图解析器会根据该名字解析到具体的视图页面
mv.setviewname("/users/users");
}
}catch(exception e){
//设置逻辑视图名，视图解析器会根据该名字解析到具体的视图页面
mv.setviewname("/users/users");
}
return mv;
}
@requestmapping(value="/add", method=requestmethod.post)
public string adduser(@requestparam multipartfile[] myfiles, httpservletrequest request) throws ioexception{
string username = request.getparameter("username");
string nickname = request.getparameter("nickname");
string password = request.getparameter("password");
string email = request.getparameter("email");
system.out.println("name:"+username);
system.out.println("nickname:"+nickname);
system.out.println("password:"+password);
system.out.println("email:"+email);
//如果只是上传一个文件，则只需要multipartfile类型接收文件即可，而且无需显式指定@requestparam注解
//如果想上传多个文件，那么 这里就要用multipartfile[]类型来接收文件，并且还要指定@requestparam注解
//并且上传多个文件时，前台表单中的所有<input type="file"/>的name都应该是myfiles，否则参数里的myfiles无法获取到所有上传的文件
for(multipartfile myfile : myfiles){
if(myfile.isempty()){
system.out.println("文件未上传");
}else{
system.out.println("文件长度: " + myfile.getsize());
system.out.println("文件类型: " + myfile.getcontenttype());
system.out.println("文件名称: " + myfile.getname());
system.out.println("文件原名: " + myfile.getoriginalfilename());
system.out.println("========================================");
//如果用的是tomcat服务器，则文件会上传到\\%tomcat_home%\\webapps\\yourwebproject\\web-inf\\upload\\文件夹中
string realpath = request.getsession().getservletcontext().getrealpath("/web-inf/upload");
//这里不必处理io流关闭的问题，因为fileutils.copyinputstreamtofile()方法内部会自动把用到的io流关掉，我是看它的源码才知道的
fileutils.copyinputstreamtofile(myfile.getinputstream(), new file(realpath, myfile.getoriginalfilename()));
}
}
return "../../index";
}
}
记得在web-info建立存放上传文件目录（upload）
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