文件上传(StringMVC)

我们经常会使用的一个功能是文件下载，既然有文件下载就会有文件上传，下面我们来看一下文件上传是如何实现的

首先准备好一个页面

jsp

<style type="text/css">
        form{
            margin:0px auto; 
            border:1px solid red;
            width:500px;
            padding:20px;
        }
    </style>
  </head>
  
  <body>
   <form action="${pageContext.request.contextPath }/frist.do" method="post" enctype="multipart/form-data">
       <h1>文件上传</h1>
       文件：<input type="file" name="uploadFile"/><br/>
       文件：<input type="file" name="uploadFile"/><br/>
       文件：<input type="file" name="uploadFile"/><br/>
       <input type="submit" value="上传">
   </form>
  </body>

单文件上传

通过对文件的大小来判断是否有文件

通过文件的类型来判断是否是允许

@Controller
public class MyController {
	@RequestMapping(value="/frist.do", method=RequestMethod.POST)
	public String doFirst(HttpSession session,MultipartFile uploadFile)throws Exception{
		if(uploadFile.getSize()>0){
			//02.获取前半部分路径，jiangWebRoot下一个名称为images文件夹  转换成绝对路径
			String path = session.getServletContext().getRealPath("/upload");
			//01.获取文件名作为保存到服务器的文件名称
			String fileName=uploadFile.getOriginalFilename();
			if(fileName.endsWith(".jpg")||fileName.endsWith(".JPG")){
				//03.路径拼接
				File file = new File(path,fileName);
				uploadFile.transferTo(file);
			}
			return "welcome.jsp";
		}
		return "error.jsp";
	}

applicationContext.xml配置

<?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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	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
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
        ">

	<!-- 配置包扫描器 -->
	<context:component-scan base-package="cn.controller"></context:component-scan>


	<bean id="multipartResolver"
		class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<property name="defaultEncoding" value="utf-8"></property><!-- 客户端发送数据的编码 -->
		<property name="maxUploadSize" value="5242880"></property><!-- 上传文件的大小 -->
		<!-- <property name="uploadTempDir" value="/upload"></property> -->
	</bean>
	<!-- mvc注解驱动 -->
	<mvc:annotation-driven />

</beans>

web.xml

<?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 mvc 适配器================ -->  
  <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:applicationContext.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>
 <!-- ================================================== --> 
   
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

多文件上传(多文件上传与单文件上传配置相同下面介绍一下不同的地方)

标记为红色的字段为多文件上传与单文件上传的区别

　　　　　@RequestMapping(value="/firstdown.do")
	public String doFirst(@RequestParam MultipartFile[] uploadFile,HttpSession session)throws Exception{
		for (MultipartFile item : uploadFile) {
			
			if(item.getSize()>0){
				//02.获取前半部分路径，jiangWebRoot下一个名称为images文件夹  转换成绝对路径
				String path = session.getServletContext().getRealPath("/upload");
				//01.获取文件名作为保存到服务器的文件名称
				String fileName=item.getOriginalFilename();
				if(fileName.endsWith(".jpg")||fileName.endsWith(".JPG")){
					//03.路径拼接
					File file = new File(path,fileName);
					item.transferTo(file);
				}
				return "welcome.jsp";
			}
		}
		return "error.jsp";
	}

文件下载

@RequestMapping(value="/first.do")


 public static void download(HttpServletRequest request,  
            HttpServletResponse response, String storeName, String contentType
           ) throws Exception {  
    	
        request.setCharacterEncoding("UTF-8");  
        BufferedInputStream bis = null;  
        BufferedOutputStream bos = null;  
  
        //获取项目根目录
        String ctxPath = request.getSession().getServletContext()  
                .getRealPath("");  
        
        //获取下载文件露肩
        String downLoadPath = ctxPath+"/uploadFile/"+ storeName;  
  
        //获取文件的长度
        long fileLength = new File(downLoadPath).length();  

        //设置文件输出类型
        response.setContentType("application/octet-stream");  
        response.setHeader("Content-disposition", "attachment; filename="  
                + new String(storeName.getBytes("utf-8"), "ISO8859-1")); 
        //设置输出长度
        response.setHeader("Content-Length", String.valueOf(fileLength));  
        //获取输入流
        bis = new BufferedInputStream(new FileInputStream(downLoadPath));  
        //输出流
        bos = new BufferedOutputStream(response.getOutputStream());  
        byte[] buff = new byte[2048];  
        int bytesRead;  
        while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {  
            bos.write(buff, 0, bytesRead);  
        }  
        //关闭流
        bis.close();  
        bos.close();  
    }

下载直接访问控制器如：http:\\localhost:8080/springmvc/download.do

或者通过JSP页面

<a href="./downloadFile/download" >下载</a>

posted @ 2017-01-10 17:56 白兴强阅读(235) 评论(0) 编辑收藏举报

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文件上传(StringMVC)

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