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一個簡略的Java web辦事器完成，比擬簡略，基於java.net.Socket和java.net.ServerSocket完成；
1、法式履行步調
1.創立一個ServerSocket對象；
2.挪用ServerSocket對象的accept辦法，期待銜接，銜接勝利會前往一個Socket對象，不然一向壅塞期待；
3.從Socket對象中獲得InputStream和OutputStream字撙節，這兩個流分離對應request要求和response呼應；
4.處置要求：讀取InputStream字撙節信息，轉成字符串情勢，並解析，這裡的解析比擬簡略，僅僅獲得uri(同一資本標識符)信息;
5.處置呼應：依據解析出來的uri信息，從WEB_ROOT目次中尋覓要求的資本資本文件, 讀取資本文件，並將其寫入到OutputStream字撙節中；
6.封閉Socket對象；
7.轉到步調2，持續期待銜接要求；
2、代碼完成
辦事器完成：
package ex01.pyrmont;
import java.net.Socket;
import java.net.ServerSocket;
import java.net.InetAddress;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;
import java.io.File;
public class HttpServer {
/**
* WEB_ROOT是HTML和其它文件寄存的目次. 這裡的WEB_ROOT為任務目次下的webroot目次
*/
public static final String WEB_ROOT = System.getProperty("user.dir") + File.separator + "webroot";
// 封閉辦事敕令
private static final String SHUTDOWN_COMMAND = "/SHUTDOWN";
public static void main(String[] args) {
HttpServer server = new HttpServer();
//期待銜接要求
server.await();
}
public void await() {
ServerSocket serverSocket = null;
int port = 8080;
try {
//辦事器套接字對象
serverSocket = new ServerSocket(port, 1, InetAddress.getByName("127.0.0.1"));
} catch (IOException e) {
e.printStackTrace();
System.exit(1);
}
// 輪回期待一個要求
while (true) {
Socket socket = null;
InputStream input = null;
OutputStream output = null;
try {
//期待銜接，銜接勝利後，前往一個Socket對象
socket = serverSocket.accept();
input = socket.getInputStream();
output = socket.getOutputStream();
// 創立Request對象並解析
Request request = new Request(input);
request.parse();
// 檢討能否是封閉辦事敕令
if (request.getUri().equals(SHUTDOWN_COMMAND)) {
break;
}
// 創立 Response 對象
Response response = new Response(output);
response.setRequest(request);
response.sendStaticResource();
// 封閉 socket 對象
socket.close();
} catch (Exception e) {
e.printStackTrace();
continue;
}
}
}
}
Request類：
package ex01.pyrmont;
import java.io.InputStream;
import java.io.IOException;
public class Request {
private InputStream input;
private String uri;
public Request(InputStream input) {
this.input = input;
}
//從InputStream中讀取request信息，並從request中獲得uri值
public void parse() {
StringBuffer request = new StringBuffer(2048);
int i;
byte[] buffer = new byte[2048];
try {
i = input.read(buffer);
} catch (IOException e) {
e.printStackTrace();
i = -1;
}
for (int j = 0; j < i; j++) {
request.append((char) buffer[j]);
}
System.out.print(request.toString());
uri = parseUri(request.toString());
}
/**
*
* requestString情勢以下：
* GET /index.html HTTP/1.1
* Host: localhost:8080
* Connection: keep-alive
* Cache-Control: max-age=0
* ...
* 該函數量的就是為了獲得/index.html字符串
*/
private String parseUri(String requestString) {
int index1, index2;
index1 = requestString.indexOf(' ');
if (index1 != -1) {
index2 = requestString.indexOf(' ', index1 + 1);
if (index2 > index1)
return requestString.substring(index1 + 1, index2);
}
return null;
}
public String getUri() {
return uri;
}
}
Response類：
package ex01.pyrmont;
import java.io.OutputStream;
import java.io.IOException;
import java.io.FileInputStream;
import java.io.File;
/*
HTTP Response = Status-Line
*(( general-header | response-header | entity-header ) CRLF)
CRLF
[ message-body ]
Status-Line = HTTP-Version SP Status-Code SP Reason-Phrase CRLF
*/
public class Response {
private static final int BUFFER_SIZE = 1024;
Request request;
OutputStream output;
public Response(OutputStream output) {
this.output = output;
}
public void setRequest(Request request) {
this.request = request;
}
public void sendStaticResource() throws IOException {
byte[] bytes = new byte[BUFFER_SIZE];
FileInputStream fis = null;
try {
//將web文件寫入到OutputStream字撙節中
File file = new File(HttpServer.WEB_ROOT, request.getUri());
if (file.exists()) {
fis = new FileInputStream(file);
int ch = fis.read(bytes, 0, BUFFER_SIZE);
while (ch != -1) {
output.write(bytes, 0, ch);
ch = fis.read(bytes, 0, BUFFER_SIZE);
}
} else {
// file not found
String errorMessage = "HTTP/1.1 404 File Not Found\r\n" + "Content-Type: text/html\r\n"
+ "Content-Length: 23\r\n" + "\r\n" + "<h1>File Not Found</h1>";
output.write(errorMessage.getBytes());
}
} catch (Exception e) {
// thrown if cannot instantiate a File object
System.out.println(e.toString());
} finally {
if (fis != null)
fis.close();
}
}
}
3、成果測試
拜訪存在的資本文件(留意寄存在工程目次的webroot文件夾裡)：
拜訪不存在的資本文件：
封閉辦事器：
參考材料：《深刻分析Tomcat》
@author 風一樣的碼農
以上就是本文的全體內容，願望對年夜家的進修有所贊助，也願望年夜家多多支撐。
