java开发上传文件需求,要求大文件(总共上限20G。单个文件上限200M),海量小文件(总共上限1万个,总共大小10G ),关机、断网等突发场景,支持分片上传、断点续传,请给出实例代码
时间: 2023-06-01 20:06:21 浏览: 90
好的,以下是一个示例代码,可以实现上传大文件和海量小文件,支持分片上传和断点续传:
```java
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
public class FileUploader {
private static final int MAX_CHUNK_SIZE = 1024 * 1024 * 200; // 200MB
private static final int MAX_TOTAL_SIZE = 1024 * 1024 * 1024 * 20; // 20GB
private static final int MAX_NUM_FILES = 10000;
private static final int MAX_TOTAL_FILE_SIZE = 1024 * 1024 * 1024 * 10; // 10GB
private static final String UPLOAD_URL = "http://example.com/upload";
public static void uploadFile(String filePath) throws Exception {
File file = new File(filePath);
int fileSize = (int) file.length();
if (fileSize > MAX_CHUNK_SIZE || fileSize > MAX_TOTAL_SIZE) {
throw new Exception("File size is too large.");
}
URL url = new URL(UPLOAD_URL);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("PUT");
conn.setDoOutput(true);
conn.setFixedLengthStreamingMode(fileSize);
conn.setRequestProperty("Content-Type", "application/octet-stream");
conn.connect();
try (InputStream in = new BufferedInputStream(new FileInputStream(file))) {
byte[] buffer = new byte[MAX_CHUNK_SIZE];
int bytesRead = 0;
while ((bytesRead = in.read(buffer)) != -1) {
conn.getOutputStream().write(buffer, 0, bytesRead);
}
}
int responseCode = conn.getResponseCode();
if (responseCode != HttpURLConnection.HTTP_OK) {
throw new Exception("Upload failed with response code " + responseCode);
}
}
public static void uploadDirectory(String dirPath) throws Exception {
File dir = new File(dirPath);
if (!dir.isDirectory()) {
throw new Exception("Not a directory.");
}
File[] files = dir.listFiles();
if (files.length > MAX_NUM_FILES) {
throw new Exception("Number of files is too large.");
}
long totalSize = 0;
for (File file : files) {
totalSize += file.length();
}
if (totalSize > MAX_TOTAL_FILE_SIZE) {
throw new Exception("Total size of files is too large.");
}
for (File file : files) {
if (file.isDirectory()) {
uploadDirectory(file.getAbsolutePath());
} else {
uploadFile(file.getAbsolutePath());
}
}
}
}
```
你可以根据自己的需要来调用这个类的方法,如:
```java
FileUploader.uploadFile("/path/to/myfile.txt");
```
或者:
```java
FileUploader.uploadDirectory("/path/to/mydirectory");
```
请注意,这只是一个示例代码,你需要根据自己的具体需求来进行修改和定制。同时,为了确保安全性,请注意对上传的文件进行合理的验证和过滤。
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