tomcat 7 源码分析-11 tomcat对http协议的实现

最新推荐文章于 2020-10-27 00:29:21 发布

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#Tomcat #Socket #浏览器

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本文深入剖析了Tomcat中HTTP协议的实现方式，重点介绍了如何通过InternalInputBuffer类解析HTTP请求头并获取关键信息如method、protocol及URI等内容。

tomcat 7 源码分析-11 tomcat对http协议的实现

Implementation of InputBuffer which provides HTTP request header parsing as well as transfer decoding

socket能获得客户端发来的http协议，tomcat需要对http协议(传输的是byte流)进行解析，例如获得http的method,protocol,URI等信息.

既然是对byte流进行处理，tomcat封装了InternalInputBuffer。

Java代码

public class InternalInputBuffer extends AbstractInputBuffer

public class InternalInputBuffer extends AbstractInputBuffer

核心函数为

public boolean parseRequestLine(boolean useAvailableDataOnly)

public boolean parseHeader()

有多个header，循环处理

Java代码

public boolean parseHeaders()
throws IOException {
while (parseHeader()) {
}
parsingHeader = false ;
end = pos;
return true ;
}

    public boolean parseHeaders()
        throws IOException {

        while (parseHeader()) {
        }

        parsingHeader = false;
        end = pos;
        return true;
    }

一个简单例子：

改写分析9中的例子

Java代码

protected boolean processSocket(Socket socket) throws IOException {
InputStream inputsteam = socket.getInputStream();
Request request = new Request();
InternalInputBuffer inputBuffer = new InternalInputBuffer(request);
inputBuffer.setInputStream(inputsteam);
request.setInputBuffer(inputBuffer);
inputBuffer.parseRequestLine(false );
System.out.println("@@@protocol=" +request.protocol().toString());
System.out.println("@@@method=" +request.method().toString());
/*
BufferedReader in = new BufferedReader(new InputStreamReader(
inputsteam));
String inputLine;
while ((inputLine = in.readLine()) != null) {
System.out.println(inputLine);
}
*/
return true ;
}

	protected boolean processSocket(Socket socket) throws IOException {
		
		InputStream inputsteam = socket.getInputStream();		
		Request request = new Request();
		InternalInputBuffer inputBuffer = new InternalInputBuffer(request);
		inputBuffer.setInputStream(inputsteam);
		
        request.setInputBuffer(inputBuffer);
        
        inputBuffer.parseRequestLine(false);
        
        System.out.println("@@@protocol="+request.protocol().toString());
        System.out.println("@@@method="+request.method().toString());
        /*
		BufferedReader in = new BufferedReader(new InputStreamReader(
				inputsteam));
		String inputLine;
		while ((inputLine = in.readLine()) != null) {	
		    System.out.println(inputLine);
		}
		
		*/
		return true;
	}

在浏览器输入：localhost:8080/，测试结果