streamwriter写入html,OutputStream的write方法没写html到页面

byte[] bytes = new byte[BUFFER_SIZE];

FileInputStream fis = null;

File file = new File(HttpServer.WEB_ROOT, request.getUri());

try {

if (file.exists()) {

fis = new FileInputStream(file);

int ch = fis.read(bytes, 0, 1024);

while (ch != -1) {

outputStream.write(bytes, 0, ch);

ch = fis.read(bytes, 0, 1024);

}

} else { // 文件未找到！

String errorMessage = "HTTP/1.1 404 File Not Found\r\n" + "Content-Type: text/html\r\n"

+ "Content-Length: 23\r\n" + "\r\n" + "

File Not Found

";

outputStream.write(errorMessage.getBytes());

}

} catch (Exception e) {

e.printStackTrace();

} finally {

if (fis != null)

fis.close();

}

我的项目webroot下有index.html

我访问http://localhost:8080/index.html 代码执行了while循环里的代码，但是前台显示

是while循环里的代码写错了吗？

书上代码截图：