本文實(shí)例為大家分享了SpringMVC實(shí)現(xiàn)文件上傳與下載的具體代碼,供大家參考,具體內(nèi)容如下
0.環(huán)境準(zhǔn)備
1.maven依賴
<dependencies>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>5.7.0</version>
<scope>test</scope>
</dependency>
<!-- servlet依賴 -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<!-- springMVC依賴 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.2.6.RELEASE</version>
</dependency>
<!-- 文件上傳的jar包 -->
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.8.0</version>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.3</version>
</dependency>
2.springConfig。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: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">
<!-- 開啟組件掃描 -->
<context:component-scan base-package="com.compass.file"></context:component-scan>
<!--聲明 配置springMVC視圖解析器-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!--前綴:視圖文件的路徑-->
<property name="prefix" value="/WEB-INF/view/" />
<!--后綴:視圖文件的擴(kuò)展名-->
<property name="suffix" value=".jsp" />
</bean>
<!--讀寫JSON的支持(Jackson)-->
<mvc:annotation-driven />
<!-- 配置多媒體解析 -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- 配置字符編碼集 -->
<property name="defaultEncoding" value="utf-8"> </property>
<!-- 配置文件上傳大小 單位是字節(jié) -1代表沒有限制 maxUploadSizePerFile是限制每個(gè)上傳文件的大小,而maxUploadSize是限制總的上傳文件大小 -->
<property name="maxUploadSizePerFile" value="-1"> </property>
<!-- ,不設(shè)置默認(rèn)不限制總的上傳文件大小,這里設(shè)置總的上傳文件大小不超過1M(1*1024*1024) -->
<property name="maxUploadSize" value="1048576"/>
</bean>
</beans>
3.web.xml配置
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<!-- 聲明springMvc的核心對(duì)象 DispatcherServlet -->
<servlet>
<servlet-name>web</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springConfig.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>web</servlet-name>
<url-pattern>*.mvc</url-pattern>
</servlet-mapping>
<!-- 注冊(cè)字符集過濾器,解決post請(qǐng)求的中文亂碼問題-->
<filter>
<filter-name>characterEncodingFilter</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>forRequestEncoding</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>forResponseEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
1.文件上傳
文件上傳分為三種方式:
- 單個(gè)文件單字段
- 多個(gè)文件單字段
- 多個(gè)文件多字段
注意點(diǎn):
1、提交方式為表單的post請(qǐng)求
2、from屬性中必須有enctype=“multipart/form-data”
3、如果是單字段多文件:輸入框中的屬性必須為:multiple=“multiple”
4、表單中的屬性name必須和后端參數(shù)一致
1.前端代碼
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>文件上傳</title>
</head>
<body>
<div>
<p style="text-align: center">文件上傳(單個(gè)文件單字段上傳)</p>
<form action="${pageContext.request.contextPath}/uploadFile1.mvc" method="post" enctype="multipart/form-data">
<input type="file" name="file">
<input type="submit" value="提交">
</form>
</div>
<div>
<p style="text-align: center">文件上傳(多文件單字段上傳)</p>
<form action="${pageContext.request.contextPath}/uploadFile2.mvc" method="post" enctype="multipart/form-data">
<input type="file" name="file" multiple="multiple">
<input type="submit" value="提交">
</form>
</div>
<div>
<p style="text-align: center">文件上傳(多文件多字段上傳)</p>
<form action="${pageContext.request.contextPath}/uploadFile2.mvc" method="post" enctype="multipart/form-data">
<input type="file" name="file" >
<input type="file" name="file" >
<input type="submit" value="提交">
</form>
</div>
</body>
</html>
2.后端代碼
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpSession;
import java.io.File;
import java.io.IOException;
/**
* @author compass
* @version 1.0
* @date 2021-05-11 14:33
*/
@Controller
public class UploadIFileController {
// 處理單個(gè)文件上傳
@PostMapping("/uploadFile1.mvc")
public ModelAndView uploadFile1(MultipartFile file, HttpSession session) throws IOException {
ModelAndView view = new ModelAndView();
// 得到文件名稱
String filename=file.getOriginalFilename();
System.out.println("文件名稱:"+filename);
if (!file.isEmpty()){
// 判斷文件的后綴
if (filename.endsWith(".jpg")||filename.endsWith(".png")||filename.endsWith(".txt"));
//設(shè)置文件的保存路徑
String savePath="C:\Users\14823\IdeaProjects\springMVC\fileupload\src\main\webapp\WEB-INF\file";
File srcFile = new File(savePath,filename);
// 執(zhí)行文件保存操作
file.transferTo(srcFile);
view.setViewName("forward:/uploadSuccess.jsp");
}else {
view.setViewName("forward:/uploadFailed.jsp");
}
return view;
}
// 處理多文件上傳
@PostMapping("/uploadFile2.mvc")
public ModelAndView uploadFile2(MultipartFile[] file,HttpSession session) throws IOException {
ModelAndView view = new ModelAndView();
//設(shè)置文件的保存路徑
String savePath="C:\Users\14823\IdeaProjects\springMVC\fileupload\src\main\webapp\WEB-INF\file";
String[] filenames = new String[file.length];
// 只要上傳過來的文件為空或者是不符合指定類型的都會(huì)上傳失敗
for (int i = 0; i <filenames.length ; i++) {
// 判斷上傳過來的文件是否為空
if (!file[i].isEmpty()){
String filename=file[i].getOriginalFilename();
// 判斷文件類型
if (filename.endsWith(".txt")||filename.endsWith(".jpg")||filename.endsWith(".png")){
// 創(chuàng)建一個(gè)文件對(duì)象
File srcFile = new File(savePath, filename);
// 執(zhí)行保存文件操作
file[i].transferTo(srcFile);
view.setViewName("forward:/uploadSuccess.jsp");
}else {
view.setViewName("forward:/uploadSuccess.jsp");
}
}else {
view.setViewName("forward:/uploadFailed.jsp");
}
}
return view;
}
}
2.文件下載
文件下分為兩種情況:
- 文件名稱是純英文字母的
- 文件名帶有中文不處理會(huì)亂碼的
1.前端代碼
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>文件下載</title>
</head>
<body>
<h1 style="text-align: center"><a href="${pageContext.request.contextPath}/download1.mvc?filename=preview.jpg" rel="external nofollow" >文件下載(非中文名稱)</a></h1>
<h1 style="text-align: center"><a href="${pageContext.request.contextPath}/download2.mvc?filename=文件下載.txt" rel="external nofollow" >文件下載(中文名稱)</a></h1>
</body>
</html>
2.后端代碼
/**
* @author compass
* @version 1.0
* @date 2021-05-11 15:23
*/
@Controller
public class DownloadController {
// 非中文名稱文件下載
@GetMapping("/download1.mvc")
public ResponseEntity <byte[]> fileDownload1(String filename,HttpServletRequest request) throws IOException {
String path="C:\Users\14823\IdeaProjects\springMVC\fileupload\src\main\webapp\WEB-INF\file\";
File file = new File(path,filename);
HttpHeaders header = new HttpHeaders();
header.setContentDispositionFormData("attachment",filename);
header.setContentType(MediaType.APPLICATION_OCTET_STREAM);
ResponseEntity<byte[]> result = new ResponseEntity<>(FileUtils.readFileToByteArray(file), header, HttpStatus.OK);
return result;
}
// 中文名稱文件下載
@GetMapping("/download2.mvc")
public ResponseEntity <byte[]> fileDownload2(String filename,HttpServletRequest request) throws IOException {
System.out.println(filename);
String path="C:\Users\14823\IdeaProjects\springMVC\fileupload\src\main\webapp\WEB-INF\file\";
filename = filename.replace("_", "%");
filename= URLDecoder.decode(filename,"UTF-8");
String downloadFile="";
if (request.getHeader("USER-AGENT").toLowerCase().indexOf("msie")>0){
filename= URLEncoder.encode(filename,"UTF-8");
downloadFile=filename.replaceAll("+","%20");
}else {
downloadFile=new String(filename.getBytes("UTF-8"),"ISO-8859-1");
}
File file = new File(path,filename);
HttpHeaders header = new HttpHeaders();
header.setContentDispositionFormData("attachment",downloadFile);
header.setContentType(MediaType.APPLICATION_OCTET_STREAM);
ResponseEntity<byte[]> result = new ResponseEntity<>(FileUtils.readFileToByteArray(file), header, HttpStatus.OK);
return result;
}
}
以上就是本文的全部內(nèi)容,希望對(duì)大家的學(xué)習(xí)有所幫助,也希望大家多多支持W3Cschool。