SpringMVC文件上传

spring mvc(注解)上传文件的简单例子,这有几个需要注意的地方
1.form的enctype=”multipart/form-data” 这个是上传文件必须的
2.applicationContext.xml中 <bean id=”multipartResolver” class=”org.springframework.web.multipart.commons.CommonsMultipartResolver”/> 关于文件上传的配置不能少

大家可以看具体代码如下:

注意:要导入的依赖包:

com.springsource.org.apache.commons.io-1.4.0.jar

com.springsource.org.apache.commons.fileupload-1.2.0.jar

web.xml

<?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">
    <servlet>
        <servlet-name>Dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <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>/</url-pattern>
    </servlet-mapping>

    <!-- 文件上传 -->
    <!--
     1.在web.xml中添加listener 
     2.在web.xml中添加spring框架启动的加载的配置文件路径:
     -->
    <listener>  
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  
    </listener>
    <context-param>  
        <param-name>contextConfigLocation</param-name>  
        <param-value>classpath:ApplicationContext.xml</param-value>  
    </context-param>
      
    
    
</web-app>

applicationContext.xml

    
    <!-- 对模型视图名称的解析，即在模型视图名称添加前后缀 -->  
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/views/jsp/" p:suffix=".jsp"> </bean>  
      <!-- 支持上传文件 -->  
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>  

注意:要添加前后缀,必须在XML文件上配置

    xmlns:p="http://www.springframework.org/schema/p"

Controller.java

  @RequestMapping(value = "/upload.do")  
        public String upload(@RequestParam(value = "file", required = false) MultipartFile file, HttpServletRequest request, ModelMap model) {  
            System.out.println("开始");  
            String path = request.getSession().getServletContext().getRealPath("upload");  
            System.out.println(path);
            String fileName = file.getOriginalFilename();  
//            String fileName = new Date().getTime()+".jpg";  
            System.out.println(path);  
            File targetFile = new File(path, fileName);  
            if(!targetFile.exists()){  
                targetFile.mkdirs();  
            }  
            //保存  
            try {  
                file.transferTo(targetFile);  
            } catch (Exception e) {  
                e.printStackTrace();  
            }  
            model.addAttribute("fileUrl", request.getContextPath()+"/upload/"+fileName);  
            return "experiment/kit";  
        }  

index.jsp

<form enctype="multipart/form-data" action="${paths}/upload.do" method="post">

         <p style="font-size:16px;">请选择正确的excel文件上传</p>
         <input id="txt" type="text" disabled="disabled" value="文件域" name="txt">
         <input type="button" onclick="file.click()" size="30" value="上传文件" onmousemove="file.style.pixelLeft=event.x-60;file.style.pixelTop=this.offsetTop;">
         <input id="file1" class="files" type="file" hidefocus="" size="1" style="height:26px;" name="file" onchange="txt.value=this.value">
         <p style="color:red;">支持的excel格式为：xls、xlsx、xlsb、xlsm、xlst！</p>
         <input  class="btn btn_ok" type="submit" value="确认"> 
</form>