Java是一種跨平臺、面向?qū)ο蟮木幊陶Z言，具有廣泛的應(yīng)用范圍。其中，照片上傳和下載是Java應(yīng)用中的常見需求。本文將介紹Java如何完成照片上傳和下載的功能。

照片上傳

/**
 * 上傳照片
 * @param file 照片文件
 * @param url 上傳接口地址
 * @return 上傳成功后返回的結(jié)果
 */
public static String uploadPhoto(File file, String url) throws Exception {
CloseableHttpClient httpClient = HttpClients.createDefault();
HttpPost httpPost = new HttpPost(url);
FileBody fileBody = new FileBody(file);
MultipartEntityBuilder builder = MultipartEntityBuilder.create();
builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);
builder.addPart("file", fileBody);
HttpEntity entity = builder.build();
httpPost.setEntity(entity);
CloseableHttpResponse response = httpClient.execute(httpPost);
if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
HttpEntity responseEntity = response.getEntity();
return EntityUtils.toString(responseEntity, "utf-8");
}
return null;
}

照片下載

/**
 * 下載照片
 * @param url 照片地址
 * @param destFile 存儲路徑
 * @return 下載成功后返回的結(jié)果
 */
public static String downloadPhoto(String url, File destFile) {
CloseableHttpClient httpClient = HttpClients.createDefault();
HttpGet httpGet = new HttpGet(url);
try {
CloseableHttpResponse response = httpClient.execute(httpGet);
if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
HttpEntity entity = response.getEntity();
OutputStream out = new FileOutputStream(destFile);
entity.writeTo(out);
out.close();
return "下載成功！";
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}

通過以上代碼，可以很方便地實現(xiàn)Java應(yīng)用中的照片上傳和下載功能。