Spring +SpringMVC 实现文件上传功能。。。

要实现Spring +SpringMVC  实现文件上传功能。

第一步：下载

第二步：

新建一个web项目导入Spring 和SpringMVC的jar包（在MyEclipse里有自动生成spring的jar包这里就不多说）

然后把刚刚下载的两个包放在lib目录下。

第三步：

在web.xml中把springMVC和spring合并。

<?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">
<!--配置编码格式-->
 <filter>
  <filter-name>filterEncoding</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>filterEncoding</filter-name>
     <url-pattern>*.html</url-pattern>
 </filter-mapping>
 <servlet>
  <servlet-name>dispatcher</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  <!-- 合并spring mvc的xml配置文件和spring的配置文件 如果没有合并那么每个control 都对应一个xml （servletname-servlet.xml） -->
  <init-param>
   <param-name>contextConfigLocation</param-name>
   <param-value>classpath:applicationContext.xml</param-value>
  </init-param>
  <load-on-startup>1</load-on-startup>
 </servlet>
 <servlet-mapping>
  <servlet-name>dispatcher</servlet-name>
  <url-pattern>*.do</url-pattern>
 </servlet-mapping>
 <servlet-mapping>
  <servlet-name>dispatcher</servlet-name>
  <url-pattern>*.html</url-pattern>
 </servlet-mapping>
 <welcome-file-list>
  <welcome-file>index.jsp</welcome-file>
 </welcome-file-list>
 <login-config>
  <auth-method>BASIC</auth-method>
 </login-config>
</web-app>

第四步：

修改spring配置文件applicationContext.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:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-3.0.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
        ">

<context:component-scan base-package="com.control"/>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" >
    <property name="prefix" value="/" />
    <property name="suffix" value=".jsp"/>
</bean>
<!-- 上传文件必须的配置 -->
 <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="defaultEncoding" value="utf-8"></property>
        <property name="maxUploadSize" value="10485760000"></property>
        <property name="maxInMemorySize" value="40960"></property>
  </bean>  

</beans>

ok！环境就这样搭好了！接下来就真正实现功能了！

首先书写一个上传文件的类

@Controller
@RequestMapping("/file")
public class UploadControl {

    @RequestMapping("/upload.html")
    public String upload(@RequestParam (value = "file", required = false) MultipartFile file, HttpServletRequest request, ModelMap model){

           System.out.println("开始");
          //文件上传到的位置
            String path = request.getSession().getServletContext().getRealPath("upload");
           //上传的文件名
            String fileName = file.getOriginalFilename();
            //处理重复提交相同东西不被覆盖
           // String fileName = new Date().getTime()+".jpg";
            File targetFile = new File(path, fileName);
            //判断文件夹是否存在
            if(!targetFile.exists()){
                targetFile.mkdirs();
            }  

            //保存
            try {
                file.transferTo(targetFile);
            } catch (Exception e) {
                e.printStackTrace();
            }
            model.addAttribute("fileUrl", request.getContextPath()+"/upload/"+fileName);  

            return "success";
    }
}

然后是jsp

 <body>
　
       <form action="file/upload.html" method="post" enctype="multipart/form-data">
        <input type="file" name="file" />
        <input type="submit" value="上传" />
    </form>  <br/>

就这样一个上传的功能就实现了！