http报文格式

知识点了解：之前已写到过，http报文格式如下：

报文首部（第一行为请求方法 请求uri http版本 或者http版本 响应状态码）
空行
报文主体（就是请求体body）

有了上述概念之后就可以实现自己来解析http报文了。

首部字段类型

General Header Fields
Request Header Fields（发送http请求时用到）
Response Header Fields （响应http报文中用到）
Entity Header Fields

http/1.1中规定了47种首部字段，不需要都记住，了解然后知道去查就ok了。

其他请求，响应中用到了更丰富的字段，http/1.1官方解读查询。
除此之外，在开发过程中可以进行header的自定义。

现在进入正题，解析http报文，java代码如下

package HTTPParser;import HTTPParser.httpMsgParser.HttpMsgParser;import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;/*** @author liubh* @date 2020/1/2 16:58* @email*/
public class HTTPReceivedMsg implements HttpMsgParser<HTTPReceivedMsg> {private String httpMsg;private Map HeaderMsg;private byte[] requestBody;public String getHttpMsg() {return httpMsg;}public void setHttpMsg(String httpMsg) {this.httpMsg = httpMsg;}public Map getHeaderMsg() {return HeaderMsg;}public void setHeaderMsg(Map headerMsg) {HeaderMsg = headerMsg;}public byte[] getRequestBody() {return requestBody;}public void setRequestBody(byte[] requestBody) {this.requestBody = requestBody;}@Overridepublic String toString() {return "HTTPReceivedMsg{" +"httpMsg='" + httpMsg + '\'' +", HeaderMsg=" + HeaderMsg +", requestBody=" + Arrays.toString(requestBody) +'}';}@Overridepublic HTTPReceivedMsg parse(String message) {HTTPReceivedMsg httpReceivedMsg = new HTTPReceivedMsg();String[] split = message.split("\r\n\r\n");HashMap hashMap = new HashMap();if (split.length == 1){String[] split1 = split[0].split("\r\n");httpReceivedMsg.setHttpMsg(split1[0]);for (int i = 1; i < split1.length;i++){String[] split2 = split1[i].split("\\:");hashMap.put(split2[0],split2[1]);}}if (split.length == 2){String[] split1 = split[0].split("\r\n");httpReceivedMsg.setHttpMsg(split1[0]);for (int i = 1; i < split1.length;i++){String[] split2 = split1[i].split("\\:");hashMap.put(split2[0],split2[1]);}httpReceivedMsg.setRequestBody(split[1].getBytes());}httpReceivedMsg.setHeaderMsg(hashMap);return httpReceivedMsg;}
}

按照http报文的三个部分，首部字段和主体进行分开，首部字段前http版本行单独抽出，这样就完成了http报文解析。

实现结果如下：

POST /hello HTTP/1.1
Content-Type: application/json
User-Agent: PostmanRuntime/7.20.1
Accept: */*
Cache-Control: no-cache
Postman-Token: 23a045e5-736e-49b8-8ddd-87b1af2787e7
Host: localhost:9000
Accept-Encoding: gzip, deflate
Content-Length: 73
Connection: keep-alive{"MntNo":"ddd","ign":"fffff","pagex":"1","paze":"20","sech":"s","st":"d"}
*********************************************************************
HTTPReceivedMsg{httpMsg='POST /hello HTTP/1.1', HeaderMsg={Accept= */*, Cache-Control= no-cache, User-Agent= PostmanRuntime/7.20.1, Connection= keep-alive, Postman-Token= 23a045e5-736e-49b8-8ddd-87b1af2787e7, Host= localhost, Accept-Encoding= gzip, deflate, Content-Length= 73, Content-Type= application/json}, requestBody=[123, 34, 77, 110, 116, 78, 111, 34, 58, 34, 100, 100, 100, 34, 44, 34, 105, 103, 110, 34, 58, 34, 102, 102, 102, 102, 102, 34, 44, 34, 112, 97, 103, 101, 120, 34, 58, 34, 49, 34, 44, 34, 112, 97, 122, 101, 34, 58, 34, 50, 48, 34, 44, 34, 115, 101, 99, 104, 34, 58, 34, 115, 34, 44, 34, 115, 116, 34, 58, 34, 100, 34, 125]}

解析前报文主体是一串json，我用了一个byte[]进行接受

这就实现了一个简单的http报文的解析