[英]Java - HttpServer not serving images
我有一個簡單的設置,包括一個帶有一些上下文的HttpServer來加載圖像和CSS文件:
public class Server {
private HttpServer httpServer;
public Server(int port, String path, HttpHandler handler) {
try {
httpServer = HttpServer.create(new InetSocketAddress(port), 0);
httpServer.createContext(path, handler);
// load css files
List<String> cssFiles = new ArrayList<String>();
Files.walk(Paths.get("../css")).forEach(filePath -> {
if (Files.isRegularFile(filePath)) {
cssFiles.add(filePath.getFileName().toString());
}
});
for (String cssFile : cssFiles) {
httpServer.createContext("/css/" + cssFile, new CssHandler(cssFile));
}
// load image files
List<String> imgFiles = new ArrayList<String>();
Files.walk(Paths.get("../images")).forEach(filePath -> {
if (Files.isRegularFile(filePath)) {
imgFiles.add(filePath.getFileName().toString());
}
});
for (String imgFile : imgFiles) {
httpServer.createContext("/images/" + imgFile, new ImageHandler(imgFile));
}
httpServer.setExecutor(null);
} catch (IOException e) {
e.printStackTrace();
}
}
public void start() {
this.httpServer.start();
}
}
除此以外,還有一個css處理程序可以很好地工作,還有一個圖像處理程序類,該類提供html標記中定義的圖像,但是不能加載通過css標記“ background-image”包含的BUT圖像。為什么?
ImageHandler:
class ImageHandler implements HttpHandler {
private String img;
public ImageHandler(String img) {
this.img = img;
}
@Override
public void handle(HttpExchange http) throws IOException {
if (http.getRequestMethod().equals("GET")) {
System.out.println("img transfered..." + img);
try {
StringBuilder contentBuilder = new StringBuilder();
try {
BufferedReader in = new BufferedReader(new FileReader("../images/" + img));
String str;
while ((str = in.readLine()) != null) {
contentBuilder.append(str);
}
in.close();
} catch (IOException e) {
}
String response = contentBuilder.toString();
http.sendResponseHeaders(200, response.length());
OutputStream os = http.getResponseBody();
os.write(response.getBytes());
os.flush();
os.close();
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
}
太好了
這有效:
<img src="images/example.png"/>
但這不起作用:
background-image: url("images/example.png");
有人可以解釋原因並提出解決方案嗎?
由於部分URL相對於樣式表的來源,因此您的路徑結構如下所示:
/images/example.png
/css/example.css
因此example.css
圖片URL應該是絕對URL( /images/example.png
),或具有正確的相對路徑( ../images/example.png
)。
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