[英]How to create a HTTP-response sending an image in JAVA?
I'm occurring some trouble writing a basic webserver in JAVA. 我在JAVA中编写基本的Web服务器时遇到了一些麻烦。 It's currently working fine at delivering html or css files.
目前它正在提供html或css文件。 But when it comes to images things are messed up.
但是当谈到图像时,事情就搞砸了。 I assume I'm doing something wrong at reading the image-files and preparing them to be sent.
我认为我在阅读图像文件并准备发送它时做错了。 But have a look at the code:
但看看代码:
public void launch()
{
while(true)
{
try
{
Socket connection = this.server_socket.accept();
...
PrintWriter print_writer = new PrintWriter(connection.getOutputStream());
String response = this.readFile(this.request_header.get("Resource"));
print_writer.print(response);
print_writer.flush();
connection.close();
}
catch(...)
{
...
}
}
}
private String readFile(String path)
{
try
{
...
FileInputStream file_input_stream = new FileInputStream(path);
int bytes = file_input_stream.available();
byte[] response_body = new byte[bytes];
file_input_stream.read(response_body);
this.response_body = new String(response_body);
file_input_stream.close();
this.setResponseHeader(200, file_ext);
this.response_header = this.response_header + "\r\n\r\n" + this.response_body;
}
catch(...)
{
...
}
return this.response_header;
}
So my browser receives something like: 所以我的浏览器会收到以下内容
HTTP/1.0 200 OK
Content-type: image/jpeg
[String that was read in readFile()]
But chrome's not displaying the image correctly and opera won't show it all! 但是Chrome没有正确显示图像而且歌剧不会显示出来! I used to read the file with an BufferedReader but I found someone saying that the BufferedReader can't handle binary data properly so I tried with the FileInputStream, but the problem stayed the same ):
我曾经用BufferedReader读取文件,但我发现有人说BufferedReader无法正确处理二进制数据所以我尝试使用FileInputStream,但问题保持不变):
Thanks for any hints and help in advance (: 感谢您提前提供的任何提示和帮助(:
You must use streams on both sides: input stream and output stream. 您必须在两端使用流:输入流和输出流。 Readers and writers assume the content is Unicode and make adjustments to the byte stream.
读者和编写者假设内容是Unicode并对字节流进行调整。 PrintWriter is, of course, a writer.
PrintWriter当然是作家。
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