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
1準備工作
web.xml文件導入DispatcherServlet，CharacterEncodingFilter
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<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
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<%@ 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
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<?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> |
2.文件上傳
controller
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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;@Controllerpublic 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
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/* * 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"; } |
3.文件下載
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@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; } |
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：https://blog.csdn.net/qq_53578500/article/details/119484932
