使用SpringMVC包装的解析器(CommonsMultipartResolver)进行文件上传控制 需要引入 apache的 common-fileupload组件包、commons-io、commons-lang、commons-logging等
jsp文件的编写:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'form.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<form action="${pageContext.request.contextPath}/upload" method="post" enctype="multipart/form-data">
文件上传<input type="file" name="myFile" />
<input type="submit" />
</form>
<a href="${pageContext.request.contextPath}/download.action?fileName=日志、学号.txt">下载文件</a>
</body>
</html>
web.xml配置文件:
<?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">
<!-- springmvc -->
<filter>
<filter-name>utf</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>utf</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter>
<filter-name>myencode</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>
<!-- servlet一般是不支持delete和put 所以要配置一个过滤器 -->
<filter>
<filter-name>hidden</filter-name>
<filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>hidden</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- 配置action -->
<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet </servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/springmvc.xml</param-value>
</init-param>
<load-on-startup>0</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>*.action</url-pattern>
<url-pattern>/</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
springMvc.xml配置文件:
<?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:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
">
<!-- 名称必须使用 multipartResolver 因为spring容器使用名称注入 文件上传解析器-->
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="maxUploadSize" value="1048576"></property>
</bean>
<!-- 扫描spring注解 -->
<context:component-scan base-package="cn.et"></context:component-scan>
<mvc:annotation-driven>
<mvc:message-converters>
<bean id="myConvetor" class="cn.et.springmvc.lesson02.message.MyMessageConvertor">
<property name="supportedMediaTypes">
<list>
<!-- 设置响应支持的类型 -->
<value>text/html;charset=UTF-8</value>
<!-- 设置请求body支持的类型 -->
<value>application/x-www-form-urlencoded</value>
</list>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
</beans>
Action的接受方式——文件上传与下载:
package cn.et.springmvc.lesson02.file;
import java.io.File;
import java.io.IOException;
import java.net.URLEncoder;
import javax.servlet.http.HttpServletResponse;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.util.FileCopyUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
@Controller
public class SpringIo {
private String filePath="D:/file";
/**
* 文件上传
* @param myFile
* @return
* @throws IllegalStateException
* @throws IOException
*/
@RequestMapping(value="/upload")
public String upload(@RequestParam("myFile") MultipartFile myFile, HttpServletResponse response) throws IllegalStateException, IOException{
String fileName = myFile.getOriginalFilename();
String destFile = filePath+"/"+fileName;
myFile.transferTo(new File(destFile));
response.getWriter().println("upload success");
return null;
}
/**
* 文件下载
* @param myFile
* @param response
* @return
* @throws IOException
* @throws IllegalStateException
* @throws IOException
*/
@RequestMapping(value="/download")
public ResponseEntity<byte[]> download(String fileName) throws IOException{
//需要下载的目标文件
File file = new File("D:/file/"+fileName);
//读取目标文件为二进制数组
byte[] fileByte = FileCopyUtils.copyToByteArray(file)/*FileCopyUtils是工具类,可以直接读取到file文件的byte[]字节数组*/;
//设置响应头
HttpHeaders hh = new HttpHeaders();
//设置下载的文件的名称
hh.setContentDispositionFormData("attachment", URLEncoder.encode(fileName, "UTF-8")/* URLEncoder解决中文乱码问题*/);
//构建ResponseEntity对象
ResponseEntity<byte[]> re = new ResponseEntity<byte[]>(fileByte, hh, HttpStatus.CREATED/*成功的枚举 200*/);
return re;
}
}
如果上传下载出现文件名的乱码问题去看:解决SpringMvc限定请求方法POST推送数据出现的中文乱码问题
在web.xml添加org.springframework.web.filter.CharacterEncodingFilter过滤器即可