Spring Boot教程(十三)：Spring Boot檔案上傳
阿新 • • 發佈：2019-01-11
一、建立一個簡單的包含WEB依賴的SpringBoot專案
pom.xml內容：
<!-- Spring Boot web啟動器 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- jsp -->
<dependency>
<groupId
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二、配置檔案上傳的檔案大小限制
application.properties配置檔案新增：
# 上傳檔案總的最大值
spring.servlet.multipart.max-request-size=10MB
# 單個檔案的最大值
spring.servlet.multipart.max-file-size=10MB
## jsp
spring.mvc.view.prefix=/WEB-INF/jsp/
spring.mvc
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spring.servlet.multipart.max-file-size限制單個檔案的最大值spring.servlet.multipart.max-request-size限制上傳的多個檔案的總大小
三、單檔案上傳示例
1、建立Controller控制類，內容如下：
package com.songguoliang.springboot.controller;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.util.List;
/**
* @Description
* @Author sgl
* @Date 2018-05-15 14:04
*/
@Controller
public class UploadController {
private static final Logger LOGGER = LoggerFactory.getLogger(UploadController.class);
@GetMapping("/upload")
public String upload() {
return "upload";
}
@PostMapping("/upload")
@ResponseBody
public String upload(@RequestParam("file") MultipartFile file) {
if (file.isEmpty()) {
return "上傳失敗，請選擇檔案";
}
String fileName = file.getOriginalFilename();
String filePath = "/Users/itinypocket/workspace/temp/";
File dest = new File(filePath + fileName);
try {
file.transferTo(dest);
LOGGER.info("上傳成功");
return "上傳成功";
} catch (IOException e) {
LOGGER.error(e.toString(), e);
}
return "上傳失敗！";
}
}
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2、建立upload.jsp檔案
只有一個表單，選擇檔案，form的enctype為multipart/form-data:
<%@ page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-type" content="text/html; charset=UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
<title>單檔案上傳</title>
</head>
<body>
<form method="post" action="/upload" enctype="multipart/form-data">
<input type="file" name="file"><br>
<input type="submit" value="提交">
</form>
</body>
</html>
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3、通過springboot外掛啟動專案，瀏覽器輸入http://localhost:8080/upload：
選擇檔案點選提交按鈕返回成功資訊，我們上傳的檔案儲存在/Users/itinypocket/workspace/temp路徑下：
四、多檔案上傳
1、建立多檔案上傳的jsp頁面，多檔案上傳頁面只是比單檔案上傳多了file選擇的input而已，multiUpload.jsp內容如下：
<%@ page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-type" content="text/html; charset=UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/>
<title>多檔案上傳</title>
</head>
<body>
<form method="post" action="/multiUpload" enctype="multipart/form-data">
<input type="file" name="file"><br>
<input type="file" name="file"><br>
<input type="file" name="file"><br>
<input type="submit" value="提交">
</form>
</body>
</html>
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2、在UploadController裡新增多檔案上傳的方法
@GetMapping("/multiUpload")
public String multiUpload() {
return "multiUpload";
}
@PostMapping("/multiUpload")
@ResponseBody
public String multiUpload(HttpServletRequest request) {
List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("file");
String filePath = "/Users/itinypocket/workspace/temp/";
for (int i = 0; i < files.size(); i++) {
MultipartFile file = files.get(i);
if (file.isEmpty()) {
return "上傳第" + (i++) + "個檔案失敗";
}
String fileName = file.getOriginalFilename();
File dest = new File(filePath + fileName);
try {
file.transferTo(dest);
LOGGER.info("第" + (i + 1) + "個檔案上傳成功");
} catch (IOException e) {
LOGGER.error(e.toString(), e);
return "上傳第" + (i++) + "個檔案失敗";
}
}
return "上傳成功";
}
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3、重啟服務，瀏覽器輸入http://localhost:8080/multiUpload:
4、然後選擇要上傳的檔案，點選提交按鈕，得到成功資訊：
我們選擇的三個檔案已被成功上傳到/Users/itinypocket/workspace/temp路徑下。