一个简单的HTTP请求与应答基于socket
2017-08-03 18:47
246 查看
tomcat是一个web容器，网络请求基于HTTP，HTTP底层基于socket抽象层，直接上图（盗的图）
我就简单实现了一个socket来模拟HTTP请求与应答
代码的逻辑非常简单，先是获得HTTP请求，打印其HTTP的request部分，然后获得输出流，按照HTTP中response的响应格式，输出一个简单的html。最终的效果就是，在浏览器中输入http://localhost:9002/ 就会返回一个简单的html页面，效果如下图：
其中有一个好玩的现象，当我在浏览器敲入localhost:9002的时候，后台程序打印出来发现浏览器发送了两次HTTP请求：
GET / HTTP/1.1
Host: localhost:9002
Connection: keep-alive
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.6,en;q=0.4
Cookie: Idea-d1657464=19a93302-2aa0-4496-a546-c42fd7726ea0
GET /favicon.ico HTTP/1.1
Host: localhost:9002
Connection: keep-alive
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36
Accept: image/webp,image/apng,image/*,*/*;q=0.8
Referer: http://localhost:9002/
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.6,en;q=0.4
Cookie: Idea-d1657464=19a93302-2aa0-4496-a546-c42fd7726ea0
其中第一次请求使我们比较熟悉的，但是第二次请求我从来没注意到过，但是看了下请求的格式，好像大概的能明白请求的意图从第一行就可以看出来请求的是一个icon，我们每次打开一个网页的时候，你有没有注意到每个网页标签页左上角都会有一个icon小图标。既然遇到了这个有趣的地方，那么要去实现这个功能，程序改的也比较简单，当第二次HTTP请求的时候，我们返回一个带有图片文件的Response。程序如下：
package Socket;
import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
/**
* Created by Jackie on 2017/8/2.
*
*/
public class HttpSocket {
private static final String OUTPUT = "<html><head><title>Example</title></head><body><p>Worked!!!</p></body></html>";
private static final String OUTPUT_HEADERS = "HTTP/1.1 200 OK\r\n" +
"Content-Type: text/html\r\n" +
"Content-Length: ";
private static final String OUTPUT_HEADERS_IOCN = "HTTP/1.1 200 OK\r\n" +
"Content-Type: image/*\r\n" +
"Content-Length: ";
private static final String OUTPUT_END_OF_HEADERS = "\r\n\r\n";
private static final String Icon_Location = "/Users/macbookpro/Desktop/resizeApi.png";
public void start() {
try {
ServerSocket serverSocket = new ServerSocket(9002);
boolean isStop = false;
boolean isIconRequest = false;
while (!isStop) {
Socket socket = serverSocket.accept();
InputStream in = socket.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(in));
String line = null;
while ((line = bufferedReader.readLine())!=null){
System.out.println(line);
if(line.contains("GET /favicon.ico")){
sendIcon(Icon_Location , socket);
isIconRequest = true;
}
if (line.isEmpty())
break;
}
if (!isIconRequest)
sendResponse(socket);
socket.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
public void sendResponse(Socket socket) throws IOException {
OutputStream outputStream = socket.getOutputStream();
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(outputStream));
bw.write(OUTPUT_HEADERS + OUTPUT.length() + OUTPUT_END_OF_HEADERS + OUTPUT);
bw.flush();
bw.close();
}
public void sendIcon(String iconLocation , Socket socket) throws IOException {
File file = new File(iconLocation);
if (!file.exists())
throw new FileNotFoundException();
BufferedInputStream fileIn = new BufferedInputStream(new FileInputStream(file));
BufferedOutputStream fileOut = new BufferedOutputStream(socket.getOutputStream());
fileOut.write(OUTPUT_HEADERS.getBytes());
fileOut.write(String.valueOf(file.length()).getBytes());
fileOut.write(OUTPUT_END_OF_HEADERS.getBytes());
byte[] buf = new byte[1024];
int size = 0;
while ((size = fileIn.read(buf))>0){
fileOut.write(buf , 0 , size);
}
fileOut.flush();
fileOut.close();
fileIn.close();
}
public static void main(String[] args) throws IOException {
new HttpSocket().start();
}
} 发送图片的IO流我选择了字节流，因为在以前我尝试用字符去复制二进制图片文件时，复制完成后打不开了，提示我格式有错误，然后我选择了字节流就解决了这个问题。最终的返回页面如图：
在标签的左上角就有了一个github小图标了》
我就简单实现了一个socket来模拟HTTP请求与应答
package Socket;
import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
/**
* Created by Jackie on 2017/8/2.
*
*/
public class HttpSocket {
private static final String OUTPUT = "<html><head><title>Example</title></head><body><p>Worked!!!</p></body></html>";
private static final String OUTPUT_HEADERS = "HTTP/1.1 200 OK\r\n" +
"Content-Type: text/html\r\n" +
"Content-Length: ";
private static final String OUTPUT_END_OF_HEADERS = "\r\n\r\n";
public void start() {
try {
ServerSocket serverSocket = new ServerSocket(9002);
boolean isStop = false;
while (!isStop) {
Socket socket = serverSocket.accept();
InputStream in = socket.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(in));
String line = null;
while ((line = bufferedReader.readLine())!=null){
System.out.println(line);
if (line.isEmpty())
break;
}
sendResponse(socket);
socket.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
public void sendResponse(Socket socket) throws IOException {
OutputStream outputStream = socket.getOutputStream();
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(outputStream));
bw.write(OUTPUT_HEADERS + OUTPUT.length() + OUTPUT_END_OF_HEADERS + OUTPUT);
bw.flush();
bw.close();
}
public static void main(String[] args){
new HttpSocket().start();
}
}代码的逻辑非常简单，先是获得HTTP请求，打印其HTTP的request部分，然后获得输出流，按照HTTP中response的响应格式，输出一个简单的html。最终的效果就是，在浏览器中输入http://localhost:9002/ 就会返回一个简单的html页面，效果如下图：
其中有一个好玩的现象，当我在浏览器敲入localhost:9002的时候，后台程序打印出来发现浏览器发送了两次HTTP请求：
GET / HTTP/1.1
Host: localhost:9002
Connection: keep-alive
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.6,en;q=0.4
Cookie: Idea-d1657464=19a93302-2aa0-4496-a546-c42fd7726ea0
GET /favicon.ico HTTP/1.1
Host: localhost:9002
Connection: keep-alive
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36
Accept: image/webp,image/apng,image/*,*/*;q=0.8
Referer: http://localhost:9002/
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.6,en;q=0.4
Cookie: Idea-d1657464=19a93302-2aa0-4496-a546-c42fd7726ea0
其中第一次请求使我们比较熟悉的，但是第二次请求我从来没注意到过，但是看了下请求的格式，好像大概的能明白请求的意图从第一行就可以看出来请求的是一个icon，我们每次打开一个网页的时候，你有没有注意到每个网页标签页左上角都会有一个icon小图标。既然遇到了这个有趣的地方，那么要去实现这个功能，程序改的也比较简单，当第二次HTTP请求的时候，我们返回一个带有图片文件的Response。程序如下：
package Socket;
import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
/**
* Created by Jackie on 2017/8/2.
*
*/
public class HttpSocket {
private static final String OUTPUT = "<html><head><title>Example</title></head><body><p>Worked!!!</p></body></html>";
private static final String OUTPUT_HEADERS = "HTTP/1.1 200 OK\r\n" +
"Content-Type: text/html\r\n" +
"Content-Length: ";
private static final String OUTPUT_HEADERS_IOCN = "HTTP/1.1 200 OK\r\n" +
"Content-Type: image/*\r\n" +
"Content-Length: ";
private static final String OUTPUT_END_OF_HEADERS = "\r\n\r\n";
private static final String Icon_Location = "/Users/macbookpro/Desktop/resizeApi.png";
public void start() {
try {
ServerSocket serverSocket = new ServerSocket(9002);
boolean isStop = false;
boolean isIconRequest = false;
while (!isStop) {
Socket socket = serverSocket.accept();
InputStream in = socket.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(in));
String line = null;
while ((line = bufferedReader.readLine())!=null){
System.out.println(line);
if(line.contains("GET /favicon.ico")){
sendIcon(Icon_Location , socket);
isIconRequest = true;
}
if (line.isEmpty())
break;
}
if (!isIconRequest)
sendResponse(socket);
socket.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
public void sendResponse(Socket socket) throws IOException {
OutputStream outputStream = socket.getOutputStream();
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(outputStream));
bw.write(OUTPUT_HEADERS + OUTPUT.length() + OUTPUT_END_OF_HEADERS + OUTPUT);
bw.flush();
bw.close();
}
public void sendIcon(String iconLocation , Socket socket) throws IOException {
File file = new File(iconLocation);
if (!file.exists())
throw new FileNotFoundException();
BufferedInputStream fileIn = new BufferedInputStream(new FileInputStream(file));
BufferedOutputStream fileOut = new BufferedOutputStream(socket.getOutputStream());
fileOut.write(OUTPUT_HEADERS.getBytes());
fileOut.write(String.valueOf(file.length()).getBytes());
fileOut.write(OUTPUT_END_OF_HEADERS.getBytes());
byte[] buf = new byte[1024];
int size = 0;
while ((size = fileIn.read(buf))>0){
fileOut.write(buf , 0 , size);
}
fileOut.flush();
fileOut.close();
fileIn.close();
}
public static void main(String[] args) throws IOException {
new HttpSocket().start();
}
} 发送图片的IO流我选择了字节流，因为在以前我尝试用字符去复制二进制图片文件时，复制完成后打不开了，提示我格式有错误，然后我选择了字节流就解决了这个问题。最终的返回页面如图：
在标签的左上角就有了一个github小图标了》
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