java之spring mvc之文件上傳

目錄結構如下：

 

注意，下面說的配置文件，一般都是值的src下的配置文件，即mvc.xml。如果是web.xml，則直接說 web.xml

1. 文件上傳的注意點

表單必須是post提交，必須將 enctype 設置為 “multipart/form-data”,

使用 commons-fileupload 提交文件，需要添加 commons-fileupload 和 commons-io 的 jar 包。

2.Jsp 頁面

<form action="file/upload.do" method="post" enctype="multipart/form-data">
文件:<input type="file" name="file"/><input type="submit" value="上傳"/>
</form>
</body>

3.Controller類

@Controller
//窄化 
@RequestMapping("/file") public class UploadController {
    @RequestMapping("/upload.do") public String upload(@RequestParam("file")CommonsMultipartFile file,HttpServletRequest req) throws Exception{
        String path=req.getServletContext().getRealPath("/upload");
        //獲取文件名
        String fileName=file.getOriginalFilename();
        InputStream is = file.getInputStream();
        OutputStream os = new FileOutputStream(new File(path,fileName));
        byte[] buffer = new byte[400];
        int len=0;
        while((len=is.read(buffer))!=-1){
            os.write(buffer, 0, len);
        }
        os.close();
        is.close();
        return "redirect:/index.jsp";
    }
}

4. 在配置 文件中添加 multipartResolver

<!-- 文件上傳配置 -->
    <bean id="multipartResolver"
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize" value="1000000"/>
    </bean>

 

 附錄：

附一，這里附上mvc.xml的文件內容

<?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.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">
    <!-- 注解開發適配器 -->
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/> 
    <!-- 配置視圖解析器 -->
    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
           <!-- 為響應的視圖名稱加上前綴  -->
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <!-- 為響應的視圖名稱加上后綴  -->
        <property name="suffix" value=".jsp"/>
    </bean>
    <!-- 文件上傳配置 -->
    <bean id="multipartResolver"
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize" value="1000000"/>
    </bean>
    <!-- 掃描注解類 -->
    <context:component-scan base-package="cn.sxt.controller"/>
</beans>

 

 這里再附上 WebContent/WEB-INF/ 下的 web.xml 文件內容

<?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_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>01springmvc_helloworld</display-name>
  <servlet>
      <servlet-name>springmvc</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
      <!-- 改變springmvc配置文件的路徑及名稱 -->
      <init-param>
          <param-name>contextConfigLocation</param-name>
          <param-value>classpath:mvc.xml</param-value>
      </init-param>
  </servlet>
  <servlet-mapping>
      <servlet-name>springmvc</servlet-name>
      <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
</web-app>