java 分片上传、断点续传完整代码
时间: 2023-09-18 18:14:07 浏览: 64
以下是Java实现文件分片上传和断点续传的完整代码,包括前端页面和后端实现。
前端页面:
```html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>分片上传</title>
</head>
<body>
<form method="post" enctype="multipart/form-data">
<input type="file" id="file" name="file"/>
<br>
<button type="button" onclick="upload()">上传</button>
<br>
<progress id="progress" max="100" value="0"></progress>
</form>
<script>
function upload() {
const file = document.getElementById('file').files[0];
const chunkSize = 1024 * 1024; // 每个分片大小为 1MB
const totalChunks = Math.ceil(file.size / chunkSize); // 总共的分片数
let chunkIndex = 0; // 当前分片索引
// 上传分片
function uploadChunk(start, end) {
const xhr = new XMLHttpRequest();
const formData = new FormData();
formData.append('chunkIndex', chunkIndex);
formData.append('file', file.slice(start, end));
xhr.open('POST', '/upload');
xhr.send(formData);
xhr.onreadystatechange = function () {
if (xhr.readyState === 4) {
if (xhr.status === 200) {
chunkIndex++;
const progress = (chunkIndex / totalChunks) * 100;
document.getElementById('progress').value = progress;
if (chunkIndex < totalChunks) {
uploadChunk(chunkIndex * chunkSize, (chunkIndex + 1) * chunkSize);
} else {
// 完成上传
document.getElementById('progress').value = 100;
alert('上传完成');
}
} else {
alert('上传失败');
}
}
}
}
// 开始上传
uploadChunk(0, chunkSize);
}
</script>
</body>
</html>
```
后端实现:
```java
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
@Controller
public class FileUploadController {
@PostMapping("/upload")
public void upload(@RequestParam("file") MultipartFile file,
@RequestParam("chunkIndex") int chunkIndex) throws IOException {
final String UPLOAD_PATH = "/path/to/upload/directory"; // 上传目录
final int CHUNK_SIZE = 1024 * 1024; // 每个分片大小为 1MB
// 根据文件名和分片索引生成分片文件路径
Path filePath = Paths.get(UPLOAD_PATH, file.getOriginalFilename() + "." + chunkIndex);
// 写入分片文件
Files.write(filePath, file.getBytes());
// 如果是最后一个分片,合并所有分片
if (file.getBytes().length < CHUNK_SIZE) {
Path destPath = Paths.get(UPLOAD_PATH, file.getOriginalFilename());
for (int i = 0; i <= chunkIndex; i++) {
Path chunkPath = Paths.get(UPLOAD_PATH, file.getOriginalFilename() + "." + i);
Files.write(destPath, Files.readAllBytes(chunkPath));
Files.delete(chunkPath);
}
}
}
}
```
注意:这只是一个简单的实现,实际应用中还需要考虑分片上传和断点续传过程中的错误处理、并发控制等问题。
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