将网络资源url转化为File文件
将互联网上的http开头的url资源，保存到本地。
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private File getNetUrlHttp(String path){
//对本地文件命名，path是http的完整路径，主要得到资源的名字
String newUrl = path;
newUrl = newUrl.split("[?]")[0];
String[] bb = newUrl.split("/");
//得到最后一个分隔符后的名字
String fileName = bb[bb.length - 1];
//保存到本地的路径
String filePath="e:\\audio\\"+fileName;
File file = null;
URL urlfile;
InputStream inputStream = null;
OutputStream outputStream = null;
try{
//判断文件的父级目录是否存在，不存在则创建
file = new File(filePath);
if(!file.getParentFile().exists()){
file.getParentFile().mkdirs();
}
try{
//创建文件
file.createNewFile();
}catch (Exception e){
e.printStackTrace();
}
//下载
urlfile = new URL(newUrl);
inputStream = urlfile.openStream();
outputStream = new FileOutputStream(file);
int bytesRead = 0;
byte[] buffer = new byte[8192];
while ((bytesRead=inputStream.read(buffer,0,8192))!=-1) {
outputStream.write(buffer, 0, bytesRead);
}
}catch (Exception e) {
e.printStackTrace();
}finally {
try {
if (null != outputStream) {
outputStream.close();
}
if (null != inputStream) {
inputStream.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
return file;
}
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url转变为 MultipartFile对象
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/**
* url转变为 MultipartFile对象
* @param url
* @param fileName
* @return
* @throws Exception
*/
private static MultipartFile createFileItem(String url, String fileName) throws Exception{
FileItem item = null;
try {
HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();
conn.setReadTimeout(30000);
conn.setConnectTimeout(30000);
//设置应用程序要从网络连接读取数据
conn.setDoInput(true);
conn.setRequestMethod("GET");
if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {
InputStream is = conn.getInputStream();
FileItemFactory factory = new DiskFileItemFactory(16, null);
String textFieldName = "uploadfile";
item = factory.createItem(textFieldName, ContentType.APPLICATION_OCTET_STREAM.toString(), false, fileName);
OutputStream os = item.getOutputStream();
int bytesRead = 0;
byte[] buffer = new byte[8192];
while ((bytesRead = is.read(buffer, 0, 8192)) != -1) {
os.write(buffer, 0, bytesRead);
}
os.close();
is.close();
}
} catch (IOException e) {
throw new RuntimeException("文件下载失败", e);
}
return new CommonsMultipartFile(item);
}
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以上为个人经验，希望能给大家一个参考，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/x_christ1/article/details/112536203