对于想了解如何在JavaServlet内以分块响应的形式发送Http预告片/页脚？的读者，本文将是一篇不可错过的文章，我们将详细介绍servlet分发器，并且为您提供关于"javax.servlet.

对于想了解如何在Java Servlet内以分块响应的形式发送Http预告片/页脚？的读者，本文将是一篇不可错过的文章，我们将详细介绍servlet分发器，并且为您提供关于"javax.servlet.http.HttpServlet" was not found、2018/9/6 jsp页面出现找不到"javax.servlet.http.HttpServlet、eclipse JavaEE版"javax.servlet.http.HttpServlet" was not found on the Java Build Path问题的解决办法、groovy servlet java.lang.NoSuchMethodError: javax.servlet.http.HttpServletResponse.getStatus()I的有价值信息。

• 如何在Java Servlet内以分块响应的形式发送Http预告片/页脚？（servlet分发器）
• "javax.servlet.http.HttpServlet" was not found
• 2018/9/6 jsp页面出现找不到"javax.servlet.http.HttpServlet
• eclipse JavaEE版"javax.servlet.http.HttpServlet" was not found on the Java Build Path问题的解决办法
• groovy servlet java.lang.NoSuchMethodError: javax.servlet.http.HttpServletResponse.getStatus()I

如何在Java Servlet内以分块响应的形式发送Http预告片/页脚？（servlet分发器）

基本上我的响应头包含

Transfer-encoding =分块，

Trailer = [我想发送的一些预告片，例如“ SomeTrailer”]

一旦完成将数据写入Servlet输出流，就将编写预告片“
SomeTrailer：[value]”，但是httpclient无法正确解析此预告片。httpclient将整个输入流（包括尾部）视为单个块。在将数据写入输出流之后，我也尝试过在响应标头中写入预告片，但没有成功。

请帮忙

我还没有找到任何好的资源。

答案1

我最终为此编写了一个简单的单线程Web服务器。原来这很容易。服务器非常简单。虽然代码有点粗糙，但是主要思想就在那里。

它执行的操作是将文件内容作为第一个块发送，并将文件的校验和作为页脚发送。

import java.io.BufferedReader;import java.io.DataOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.ServerSocket;import java.net.Socket;import org.apache.commons.codec.digest.DigestUtils;import org.apache.commons.io.IOUtils;import org.apache.log4j.Logger;public class ChunkedResponseServer implements Runnable {  private static final Logger LOGGER = Logger.getLogger(ChunkedResponseServer.class);  // Space '' ''  static final byte SP = 32;  // Tab '' ''  static final byte HT = 9;  // Carriage return  static final byte CR = 13;  // Line feed character  static final byte LF = 10;  final int port;  private volatile boolean cancelled = false;  public ChunkedResponseServer(int port) {    LOGGER.info("Chunked response server running on port " + port);    this.port = port;  }  @Override  public void run() {    ServerSocket serverSocket = null;    try {      serverSocket = new ServerSocket(port);      while (!cancelled) {        final Socket connectionSocket = serverSocket.accept();        handle(connectionSocket);      }    } catch (final IOException e) {      throw new RuntimeException(e);    }  }  public void cancel() {    LOGGER.info("Shutting down Chunked response Server");    cancelled = true;  }  private void handle(Socket socket) throws IOException {    BufferedReader input = null;    DataOutputStream output = null;    try {      input = new BufferedReader(new InputStreamReader(socket.getInputStream()));      output = new DataOutputStream(socket.getOutputStream());      addHeaders(output);      addCRLR(output);      final String filename = readFilename(input);      final byte[] content = readContent(filename);      addContentAsChunk(output, content);      final String checksum = DigestUtils.md5Hex(content);      addLastChunkAndChecksumFooter(output, checksum);      addCRLR(output);    } finally {      IOUtils.closeQuietly(input);      IOUtils.closeQuietly(output);    }  }  private void addLastChunkAndChecksumFooter(DataOutputStream output, String checksum) throws IOException {    output.writeBytes("0");    addCRLR(output);    output.writeBytes("checksum: " + checksum);    addCRLR(output);  }  private void addContentAsChunk(DataOutputStream output, byte[] content) throws IOException {    output.writeBytes(Integer.toHexString(content.length));    addCRLR(output);    output.write(content);    addCRLR(output);  }  private void addCRLR(DataOutputStream output) throws IOException {    output.writeByte(CR);    output.writeByte(LF);  }  private void addHeaders(DataOutputStream output) throws IOException {    output.writeBytes("HTTP/1.1 200 OK");    addCRLR(output);    output.writeBytes("Content-type: text/plain");    addCRLR(output);    output.writeBytes("Transfer-encoding: chunked");    addCRLR(output);    output.writeBytes("Trailer: checksum");    addCRLR(output);  }  private String readFilename(BufferedReader input) throws IOException {    final String initialLine = input.readLine();    final String filePath = initialLine.split(" ")[1];    final String[] components = filePath.split("/");    return components[components.length - 1];  }  private byte[] readContent(String filename) throws IOException {    final InputStream in = Thread.currentThread().getContextClassLoader().getResourceAsStream(filename);    return IOUtils.toByteArray(in);  }}

"javax.servlet.http.HttpServlet" was not found

在 eclipse 中，用 maven 新建 web 项目时，jsp 页面报错：

The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path.

说明缺少 httpServlet，解决方法是：

右键项目 - Properties-Targeted Runtimes - 选择自己要运行的服务器，比如 Apache Tomcat v7.0-ok!

据说也可以在 pom.xml 中添加

<dependency>
	<groupId>javax.servlet</groupId>
	<artifactId>servlet-api</artifactId>
	<version>2.5</version>
</dependency>

2018/9/6 jsp页面出现找不到"javax.servlet.http.HttpServlet

新建jsp文件后出现报错

The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path

解决:

在出现此错误的项目上单击鼠标右键》Build Path》Configure Build Path

这样就好了

eclipse JavaEE版"javax.servlet.http.HttpServlet" was not found on the Java Build Path问题的解决办法

使用eclipse JavaEE 版，新建 Dynamic Web Project 项目。在项目里添加 JSP 文件，会在文件头部出现错误提示。提示语句为：The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path。如下图所示:

1. 选中项目右键打开快捷菜单。

2. 在快捷菜单中点击 Properties 打开对话框。

3. 在左边栏选择 Project Facets，相应的最右边栏选择 Runtimes 选项卡，选中对应的apache tomcat 并点击OK，

    即可解决该问题。如下图所示: 

groovy servlet java.lang.NoSuchMethodError: javax.servlet.http.HttpServletResponse.getStatus()I

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