SpringBoot上傳文件更爲簡化。
最近挺忙的，但是學習是不能停的，繼續更一下
看書學習是一件快樂的事情
首先，還是要創建一個SpringBoot項目，並添加spring-boot-starter-web依賴
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
然後在resource目錄下的static目錄中創建一個upload.html文件，內容如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="/upload" method="post" enctype="multipart/form-data">
<input type="file" name="uploadFile" value="請選擇文件">
<input type="submit" value="上傳">
</form>
</body>
</html>
這是一個很簡單的文件上傳頁面，上傳接口是/upload，注意請求方法是post，enctype是multipart/form-data.
接着創建文件上傳處理接口，FileUploadController 代碼如下：
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;
@RestController
public class FileUploadController {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy/MM/dd/");
@PostMapping("/upload")
public String upload(MultipartFile uploadFile, HttpServletRequest req){
String realPath = req.getSession().getServletContext().getRealPath("/uploadFile/");
String format = sdf.format(new Date());
File folder = new File(realPath + format);
if(!folder.isDirectory()){
folder.mkdirs();
}
String oldName = uploadFile.getOriginalFilename();
String newName = UUID.randomUUID().toString() + oldName.substring(oldName.lastIndexOf("."),oldName.length());
try{
uploadFile.transferTo(new File(folder,newName));
String filePath = req.getScheme() + "://" + req.getServerName() + ":" +req.getServerPort() + "/uploadFile/" + format + newName;
return filePath;
} catch (IOException e) {
e.printStackTrace();
}
return "上傳失敗";
}
}
最後在瀏覽器中進行測試：
上傳成功後會返回地址
用這個路徑就可以看到上傳的圖片
csdn現在審覈嚴格，微信二維碼圖片居然無法通過審覈
多文件上傳
修改upload.html文件
<form action="/uploads" method="post" enctype="multipart/form-data">
<input type="file" name="uploadFiles" value="請選擇文件" multiple="multiple">
<input type="submit" value="上傳">
</form>
使用數組實現：
@PostMapping("/uploads")
public String upload(MultipartFile[] uploadFiles, HttpServletRequest request){
if (uploadFiles == null || uploadFiles.length < 1) {
return "文件不能爲空";
}
//2，定義文件的存儲路徑,
String realPath = request.getSession().getServletContext().getRealPath("/uploadFile/");
File dir = new File(realPath);
if (!dir.isDirectory()) {//文件目錄不存在，就創建一個
dir.mkdirs();
}
try {
String filePathS = "";
//3，遍歷文件數組，一個個上傳
for (int i = 0; i < uploadFiles.length; i++) {
MultipartFile uploadFile = uploadFiles[i];
String filename = uploadFile.getOriginalFilename();
//服務端保存的文件對象
File fileServer = new File(dir, filename);
System.out.println("file文件真實路徑:" + fileServer.getAbsolutePath());
//2，實現上傳
uploadFile.transferTo(fileServer);
String filePath = request.getScheme() + "://" +
request.getServerName() + ":"
+ request.getServerPort()
+ "/uploadFile/" + filename;
filePathS = filePathS + "\n" + filePath;
}
//4，返回可供訪問的網絡路徑
return filePathS;
} catch (IOException e) {
e.printStackTrace();
}
return "上傳失敗";
}