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本篇內容介紹了“springMVC怎么實現文件上傳和下載”的有關知識，在實際案例的操作過程中，不少人都會遇到這樣的困境，接下來就讓小編帶領大家學習一下如何處理這些情況吧！希望大家仔細閱讀，能夠學有所成！
本文實例為大家分享了springMVC實現文件上傳和下載的具體代碼，供大家參考，具體內容如下
web.xml文件導入DispatcherServlet，CharacterEncodingFilter
<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>/</url-pattern> </servlet-mapping> <filter> <filter-name>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> </filter> <filter-mapping> <filter-name>encoding</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
前端測試頁面
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>$Title$</title>
</head>
<body>
<%-- 必須將表單的method設置為POST--%>
<%-- 設置enctype屬性為multipart/form-data，二進制傳遞數據--%>
<form action="${pageContext.request.contextPath}/upload2" enctype="multipart/form-data" method="post">
<input type="file" name="file"/>
<input type="submit" value="upload">
</form>
<br/>
<a href="${pageContext.request.contextPath}/download" rel="external nofollow" >點擊下載</a>
</body>
</html>spring配置文件applicationContext.xml
<?xml version="1.0" encoding="UTF8"?> <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: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 https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!-- 自動掃描指定的包，下面所有注解類交給IOC容器管理，根據自己的項目掃描包 --> <context:component-scan base-package="com.zky.controller"/> <!-- 注解驅動 --> <mvc:annotation-driven> <mvc:message-converters register-defaults="true"> <bean class="org.springframework.http.converter.StringHttpMessageConverter"> <constructor-arg value="UTF-8"/> </bean> <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"> <property name="objectMapper"> <bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean"> <property name="failOnEmptyBeans" value="false"/> </bean> </property> </bean> </mvc:message-converters> </mvc:annotation-driven> <!-- 靜態資源過濾--> <mvc:default-servlet-handler/> <!-- 視圖解析器 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver"> <!-- 前綴 --> <property name="prefix" value="/WEB-INF/jsp/" /> <!-- 后綴 --> <property name="suffix" value=".jsp" /> </bean> <!--文件上傳配置--> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <!-- 請求的編碼格式，必須和jSP的pageEncoding屬性一致，以便正確讀取表單的內容，默認為ISO-8859-1 --> <property name="defaultEncoding" value="utf-8"/> <!-- 上傳文件大小上限，單位為字節（10485760=10M） --> <property name="maxUploadSize" value="10485760"/> <property name="maxInMemorySize" value="40960"/> </bean> </beans>
controller
package com.zky.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
@Controller
public class FileController {
//@RequestParam("file") 將name=file控件得到的文件封裝成CommonsMultipartFile 對象
//批量上傳CommonsMultipartFile則為數組即可
@RequestMapping("/upload")
public String fileUpload(@RequestParam("file") CommonsMultipartFile file , HttpServletRequest request) throws IOException {
//獲取文件名 : file.getOriginalFilename();
String uploadFileName = file.getOriginalFilename();
//如果文件名為空，直接回到首頁！
if ("".equals(uploadFileName)){
return "redirect:/index.jsp";
}
System.out.println("上傳文件名 : "+uploadFileName);
//上傳路徑保存設置
String path = request.getServletContext().getRealPath("/upload");
//如果路徑不存在，創建一個
File realPath = new File(path);
if (!realPath.exists()){
realPath.mkdir();
}
System.out.println("上傳文件保存地址："+realPath);
InputStream is = file.getInputStream(); //文件輸入流
OutputStream os = new FileOutputStream(new File(realPath,uploadFileName)); //文件輸出流
//讀取寫出
int len=0;
byte[] buffer = new byte[1024];
while ((len=is.read(buffer))!=-1){
os.write(buffer,0,len);
os.flush();
}
os.close();
is.close();
return "redirect:/index.jsp";
}
}采用file.Transto 來保存上傳的文件
/*
* 采用file.Transto 來保存上傳的文件
*/
@RequestMapping("/upload2")
public String fileUpload2(@RequestParam("file") CommonsMultipartFile file, HttpServletRequest request) throws IOException {
//上傳路徑保存設置
String path = request.getServletContext().getRealPath("/upload");
File realPath = new File(path);
if (!realPath.exists()){
realPath.mkdir();
}
//上傳文件地址
System.out.println("上傳文件保存地址："+realPath);
//通過CommonsMultipartFile的方法直接寫文件（注意這個時候）
file.transferTo(new File(realPath +"/"+ file.getOriginalFilename()));
return "redirect:/index.jsp";
}@RequestMapping(value="/download")
public String downloads(HttpServletResponse response , HttpServletRequest request) throws Exception{
//要下載的圖片地址，改為自己圖片路徑,我是下載在我的項目里面的
String path = request.getServletContext().getRealPath("/upload");
//文件名
String fileName = "新建文本文檔.txt";
//1、設置response 響應頭
response.reset(); //設置頁面不緩存,清空buffer
response.setCharacterEncoding("UTF-8"); //字符編碼
response.setContentType("multipart/form-data"); //二進制傳輸數據
//設置響應頭
response.setHeader("Content-Disposition",
"attachment;fileName="+ URLEncoder.encode(fileName, "UTF-8"));
File file = new File(path,fileName);
//2、 讀取文件--輸入流
InputStream input=new FileInputStream(file);
//3、 寫出文件--輸出流
OutputStream out = response.getOutputStream();
byte[] buff =new byte[1024];
int index=0;
//4、執行 寫出操作
while((index= input.read(buff))!= -1){
out.write(buff, 0, index);
out.flush();
}
out.close();
input.close();
return null;
}“springMVC怎么實現文件上傳和下載”的內容就介紹到這里了，感謝大家的閱讀。如果想了解更多行業相關的知識可以關注億速云網站，小編將為大家輸出更多高質量的實用文章！
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