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@ -1 +1,209 @@
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Implemented a simplified version of Tomcat for learning purposes.
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### 基础
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- MyHttpRequest
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- `parse()`（解析流）
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- `parseUri()`（请求的内容存储到uri）
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- `getUri()`（返回uri）
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- MyHttpResponse
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- `sendRedirect(String uri)`（判断资源是否存在，不存在返回404 ，存在返回目标资源）
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- `getResponseMessage(String code, String message)`（构造响应消息）
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- MyHttpServer
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- `start()`（循环接收浏览器请求，并且处理请求）
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- Test`
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- `main()`（主方法测试类）
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###### MyHttpRequest
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```C#
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import java.io.IOException;
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import java.io.InputStream;
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public class MyHttpRequest {
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private InputStream inputStream;
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private String uri;
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public MyHttpRequest(InputStream inputStream) {
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this.inputStream = inputStream;
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}
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/**
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* 解析流
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*/
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public void parse(){
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try {
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byte[] bytes = new byte[1024];
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inputStream.read(bytes);
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String request = new String(bytes);
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parseUri(request);
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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}
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/**
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* 请求判断
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*/
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public void parseUri(String request) {
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int index1,index2;
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index1 = request.indexOf(" ");//找空格下标
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index2 = request.indexOf(" ",index1+1);//找空格下标2
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uri = request.substring(index1+1,index2);//输出资源位置
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System.out.println(uri);
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}
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public String getUri() {
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return this.uri;
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}
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}
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```
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###### MyHttpResponse
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```C#
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import java.io.*;
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public class MyHttpResponse {
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private int statusCode;
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private String statusMessage;
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private OutputStream outputStream;
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public MyHttpResponse(OutputStream outputStream){
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this.outputStream = outputStream;
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}
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public void sendRedirect(String uri){
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//判断资源是否存在
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// 不存在返回404
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// 存在返回目标资源
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File file = new File(System.getProperty("user.dir")+"/WebContent" + uri);
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if (file.exists()){
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try {
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FileInputStream fileInputStream = new FileInputStream(file);
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byte[] bytes = new byte[(int)file.length()];
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fileInputStream.read(bytes);
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String result = new String(bytes);
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// System.out.println(result);
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String response = getResponseMessage("200,",result);
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this.outputStream.write(response.getBytes());
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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}else {
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try {
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String error = getResponseMessage("404","404 File Not Found!");
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this.outputStream.write(error.getBytes());
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} catch (IOException e) {
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throw new RuntimeException(e);
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}
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}
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}
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public String getResponseMessage(String code, String message){
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return "HTTP/1.1 " + code + "\r\n" +
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"Content-Type: text/html\r\n" +
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"Content-Length: " + message.length() +
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"\r\n" +
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"\r\n" +
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message;
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}
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}
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```
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###### MyHttpServer
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```C#
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.net.ServerSocket;
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import java.net.Socket;
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public class MyHttpServer {
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private int port = 8080;
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public void receiving()
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{
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try{
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//create socket service
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ServerSocket serverSocket = new ServerSocket(port);
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while(true){
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//获取连接对象
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Socket socket = serverSocket.accept();
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//获取链接对象输入流
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InputStream inputStream = socket.getInputStream();
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//创建request
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MyHttpRequest request = new MyHttpRequest(inputStream);
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//解析请求
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request.parse();
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//创建响应
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OutputStream outputStream = socket.getOutputStream();
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MyHttpResponse response = new MyHttpResponse(outputStream);
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//进行响应
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response.sendRedirect(request.getUri());
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}
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//loop accept requests
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}catch (Exception e){
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}
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}
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}
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```
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###### Test
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```C#
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public class Test {
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public static void main(String[] args) {
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System.out.println("server startup successfully");
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MyHttpServer server = new MyHttpServer();
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server.receiving();
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}
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}
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```
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### 进阶
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Tomcat的两个重要身份：
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1. http服务器
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2. Tomcat是一个Servlet容器
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使用Servlet规范来实现Tomcat
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- AbstractHttpServletRequest *(implements HttpServletRequest)*
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- AbstractHttpServletResponse *(implements HttpServletResponse)*
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- ResponseServletOutputStream *(extends ServletOutputStream)*
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- `write(int b)`
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- `getBytes()`
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- `getPos()`
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- MyHttpRequest *(extends AbstractHttpServletRequest)*
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- `parse()`（解析流）
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- `parseMessageLine()`（请求行解析）
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- `getMethod()`（返回请求方式）
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- `getRequestURL()`（返回请求地址，通常为**appName/Servlet** ）
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- `getProtocol()`（返回协议）
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- MyHttpResponse *(extends AbstractHttpServletResponse)*
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- `public MyHttpResponse(MyHttpRequest request, OutputStream outputStream)`（构造方法）
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- `setStatus(int i, String s)`
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- `getStatus()`
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- `addHeader(String s, String s1)`
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- `ResponseServletOutputStream getOutputStream()`（servlet的doGet所write的消息体）
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- `complete()`（完成响应，调用下面三个方法）
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- `sendResponseMsgLine()`
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- `sendResponseMsgHeader()`
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- `sendResponseMsgBody()`
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- Tomcat (添加线程池)
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- `main(String[] args)`（启动Tomcat）
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- `deployApps()`（利用反射部署指定目录下的应用）
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- `start()`（循环接收浏览器请求，并且处理请求）
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- `getAllFilePath()`（递归的获得项目内所有文件）
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- `getContextMap()`（添加应用映射）
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- SocketProcessor *(implements Runnable)*
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- `run()`（调用processSocket）
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- `processSocket(Socket socket)`（处理请求）
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- Context
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- `addUrlPatternMapping(String pattern, Servlet servlet)`（添加应用下Servlet映射）
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- `getByUrlPatternMapping(String urlPattern)` （得到Servlet对象）
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- DefaultServlet *(extends HttpServlet)*
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xiaoifei
10 months ago
