Java servlet 和 IO：创建文件而不保存到磁盘并将其发送给用户
我希望能帮助我解决文件创建/响应问题。 我知道如何创建和保存文件。我知道如何通过 ServletOutputStream 将该文件发送回用户。
但我需要的是创建一个文件，而不将其保存在磁盘上，然后通过 ServletOutputStream 发送该文件。
上面的代码解释了我所拥有的部分。任何帮助表示赞赏。提前致谢。
// This Creates a file
//
String text = "These days run away like horses over the hill";
File file = new File("MyFile.txt");
Writer writer = new BufferedWriter(new FileWriter(file));
writer.write(text);
writer.close();
// Missing link goes here
//
// This sends file to browser
//
InputStream inputStream = null;
inputStream = new FileInputStream("C:\\MyFile.txt");
byte[] buffer = new byte[8192];
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int bytesRead;
while ( (bytesRead = inputStream.read(buffer)) != -1)
baos.write(buffer, 0, bytesRead);
response.setContentType("text/html");
response.addHeader("Content-Disposition", "attachment; filename=Invoice.txt");
byte[] outBuf = baos.toByteArray();
stream = response.getOutputStream();
stream.write(outBuf);
I`m hoping can help me out with a file creation/response question.
I know how to create and save a file. I know how to send that file back to the user via a ServletOutputStream.
But what I need is to create a file, without saving it on the disk, and then send that file via the ServletOutputStream.
The code above explains the parts that I have. Any help appreciated. Thanks in Advance.
// This Creates a file
//
String text = "These days run away like horses over the hill";
File file = new File("MyFile.txt");
Writer writer = new BufferedWriter(new FileWriter(file));
writer.write(text);
writer.close();
// Missing link goes here
//
// This sends file to browser
//
InputStream inputStream = null;
inputStream = new FileInputStream("C:\\MyFile.txt");
byte[] buffer = new byte[8192];
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int bytesRead;
while ( (bytesRead = inputStream.read(buffer)) != -1)
baos.write(buffer, 0, bytesRead);
response.setContentType("text/html");
response.addHeader("Content-Disposition", "attachment; filename=Invoice.txt");
byte[] outBuf = baos.toByteArray();
stream = response.getOutputStream();
stream.write(outBuf);
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您不需要保存文件，只需使用 ByteArray 流，尝试如下所示：
inputStream = new ByteArrayInputStream(text.getBytes());或者，更简单，只需执行以下操作：
< code>stream.write(text.getBytes());
正如 cHao 建议，使用
text.getBytes("UTF-8")或类似的东西来指定系统默认值以外的字符集。可用字符集列表可在 API 文档中找到 字符集。You don't need to save off a file, just use a ByteArray stream, try something like this:
inputStream = new ByteArrayInputStream(text.getBytes());Or, even simpler, just do:
stream.write(text.getBytes());As cHao suggests, use
text.getBytes("UTF-8")or something similar to specify a charset other than the system default. The list of available charsets is available in the API docs for Charset.