springMVC3.2 简单实现文件的上传和下载

      今天通过各种手段做了一个springmvc简单实现文件上传下载的功能，特别记录在这里以备以后查询，并请各位大神大牛指导代码与设计中的不足。

        上传文件------展示文件库中所有的文件-------点击下载按钮下载

源代码在附件中

web.xml代码：

<?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">
  <!-- The definition of the Root Spring Container shared by all Servlets and Filters -->
<!-- spring mvc 拦截  start -->
	<servlet>
		<servlet-name>springmvc</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>/WEB-INF/spring-servlet.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>
	
<!-- spring mvc 拦截  end -->
	
	<!-- 编码问题 start-->
	
	<filter>
		<filter-name>Set Character Encoding</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>
		<init-param>
			<param-name>forceEncoding</param-name>
			<param-value>true</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>Set Character Encoding</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
<!-- 编码问题 end-->
	
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

 

springmvc配置文件代码spring-servlet.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:mvc="http://www.springframework.org/schema/mvc"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd">

	<context:component-scan base-package="springapp" />
	<mvc:annotation-driven />
	<bean id="viewResolver"
		class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/view/" />
		<property name="suffix" value=".jsp" />
	</bean>
	
	<!-- 配置 文件上传 start -->
	<bean id="multipartResolver"
		class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<property name="maxUploadSize" value="1000000" />
	</bean>
	<!-- 配置 文件上传 end -->
</beans>

 文件上传的页面uploadFile.jsp

<form action="fileupload.do" method="post" enctype="multipart/form-data">
			file:<input type="file" name="file"/><br/>
			<input type="submit" value="submit"/>
		</form>

 展示所有文件的页面

 <c:forEach items="${files}" var="file">
  	<form action="downloadFile.do" method="post" >
  		<label>${file.name}</label>
  		<input type="submit" value="下载"/>
  		<input type="hidden"  name ="fileName" value="${file.name}">
  	</form>
  </c:forEach>

 

文件上传、展示、下载的控制类

package springapp.action;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
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.context.ServletContextAware;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

@Controller
public class FileAction implements ServletContextAware {

	private ServletContext servletContext;

	/**
	 * 单个文件上传
	 * 
	 * @param request
	 * @param mrequest
	 * @param response
	 * @return
	 * @throws IOException
	 */
	@RequestMapping(value = "fileupload.do", method = RequestMethod.POST)
	public String fileUpload(HttpServletRequest request, Model model,
			MultipartHttpServletRequest mrequest, HttpServletResponse response)
			throws IOException {

		MultipartFile file = mrequest.getFile("file");
		String fileName = file.getOriginalFilename();
		String path = this.servletContext.getRealPath("temp");
		// System.out.println(path);
		String pathAndfileName = path + "\\" + fileName;
		// System.out.println(pathAndfileName);
		if (!file.isEmpty()) {
			this.copyFile(file.getInputStream(), pathAndfileName);
			return "redirect:showFile.do";
		}
		model.addAttribute("msg", "上失败");
		return "uploadFile";

	}

	/**
	 * 保存文件到本地
	 * 
	 * @param in
	 * @param fileName
	 * @throws IOException
	 */
	public void copyFile(InputStream in, String filePathAndName)
			throws IOException {

		FileOutputStream fos = new FileOutputStream(filePathAndName);
		byte[] buffer = new byte[1024 * 1024];
		int bytesum = 0;
		int byteread = 0;
		while ((byteread = in.read(buffer)) != -1) {
			bytesum += byteread;
			fos.write(buffer, 0, byteread);
			fos.flush();
		}
		fos.close();
		in.close();

	}

	public void setServletContext(ServletContext arg0) {
		// TODO Auto-generated method stub
		this.servletContext = arg0;

	}

	/**
	 * 展示文件
	 * 
	 * @param model
	 * @param request
	 * @param response
	 * @return
	 */
	@RequestMapping("showFile.do")
	public String showFile(Model model, HttpServletRequest request,
			HttpServletResponse response) {
		String fileAddress = this.servletContext.getRealPath("temp");
		File[] files = new File(fileAddress).listFiles();
		List<File> fileList = new ArrayList<File>();
		for (File file : files) {
			fileList.add(file);

		}

		model.addAttribute("files", fileList);
		return "showFile";
	}

	/**
	 * 下载文件
	 * @param response
	 * @param fileName
	 * @throws IOException
	 */
	@RequestMapping(value = "downloadFile.do", method = RequestMethod.POST)
	public void downLoadFile(HttpServletResponse response,
			@RequestParam("fileName")
			String fileName) throws IOException {
		response.setContentType("multipart/form-data");
		response.setHeader("Content-Disposition", "attachment;fileName="
				+ new String(fileName.getBytes("gb2312"), "iso8859-1"));
		File file = new File(fileName);
		String path = this.servletContext.getRealPath("temp");
		InputStream in = new FileInputStream(path + "\\" + file);

		OutputStream os = response.getOutputStream();

		byte[] b = new byte[1024 * 1024];
		int length;
		while ((length = in.read(b)) > 0) {
			os.write(b, 0, length);
		}
		in.close();
	}

}

 

评论

4 楼 sheertewtw 2016-09-09  

                 地狱

3 楼 sheertewtw 2016-09-09  

                   地板

2 楼 sheertewtw 2016-09-09  

            板凳

1 楼 sheertewtw 2016-09-09  

             沙发