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专业深圳网站建设公司,云南人参果,网站的字体做多大合适,wordpress文章添加回目录一、配置Maven环境新建项目需要加载#xff0c;等右下方的进度条满就行。在D盘根目录上解压apache-maven-3.6.2-zip 同时在D盘根目录新建文件夹Maven二、手写Tomcat1、ServletConfigMappingpackage com.qcby.config;import com.qcby.lib.HttpServlet; import com.qcby.lib.Web…一、配置Maven环境新建项目需要加载等右下方的进度条满就行。在D盘根目录上解压apache-maven-3.6.2-zip同时在D盘根目录新建文件夹Maven二、手写Tomcat1、ServletConfigMappingpackage com.qcby.config; import com.qcby.lib.HttpServlet; import com.qcby.lib.WebServlet; import com.qcby.utils.SearchClassUtil; import java.util.HashMap; import java.util.List; import java.util.Map; /** * servlet容器配置类 */ public class ServletConfigMapping { /** * String, HttpServlet * String:路径作为key值 * HttpServlet:servlet对象作为value值 (多态向上转型-----父类引用指向子类对象) * */ public static MapString, HttpServlet classMapping new HashMap(); //servlet容器 //特点在main方法执行之前执行,以修饰main方法 static { ListString paths SearchClassUtil.searchClass( com.qcby.webapps.myweb); for (String path: paths) { // 获取类的注解信息,并将path作为key值,将对象作为value值 存放如classMapping当中 try{ Class clazz Class.forName(path); //获取类对象 //获取类的注解信息 WebServlet webServlet (WebServlet) clazz.getDeclaredAnnotation(WebServlet.class); //System.out.println(webServlet.value()); HttpServlet servlet (HttpServlet) clazz.getDeclaredConstructor().newInstance(); classMapping.put(webServlet.value(),servlet); }catch (Exception e){ e.printStackTrace(); } } } public static void main(String[] args) { } }2、GenericServletpackage com.qcby.lib; import java.io.IOException; public abstract class GenericServlet implements Servlet{ Override public void init() { } public abstract void service(ServletRequest request, ServletResponse response) throws IOException; Override public void destroy() { } }3、HttpServletpackage com.qcby.lib; import java.io.IOException; public abstract class HttpServlet extends GenericServlet{ public abstract void doGet(ServletRequest request, ServletResponse response) throws IOException; public abstract void doPost(ServletRequest request, ServletResponse response); Override public void service(ServletRequest request, ServletResponse response) throws IOException { if(request.getMethod().equals(GET)){ doGet(request,response); }else if(request.getMethod().equals(POST)){ doPost(request,response); } } }4、HttpServletRequestpackage com.qcby.lib; public class HttpServletRequest implements ServletRequest{ private String method; private String path; Override public String getMethod() { return method; } Override public String getPath() { return path; } Override public String setMethod(String method) { return this.method method ; } Override public String setPath(String path) { return this.path path; } }5、HttpServletResponsepackage com.qcby.lib; import com.qcby.utils.FileUtil; import java.io.File; import java.io.IOException; import java.io.OutputStream; public class HttpServletResponse implements ServletResponse{ //获取输出流 private OutputStream outputStream; public OutputStream getOutputStream() { return outputStream; } public void setOutputStream(OutputStream outputStream) { this.outputStream outputStream; } /** * 动态资源数据写回 * param context * throws IOException */ public void append(String context) throws IOException { outputStream.write(context.getBytes()); } /** * 返回静态资源 * param path 静态资源文件的相对路径 * throws Exception */ public void returnStatic(String path) throws Exception { String resource FileUtil.getResourcePath(path); // 获取静态资源真实路径 File file new File(resource); // 静态文件 if(file.exists()){ //静态文件存在 FileUtil.writeFile(file,outputStream); }else { System.out.println(404静态资源文本不存在......); } } }6、Servletpackage com.qcby.lib; import java.io.IOException; public interface Servlet { public void init(); public void service(ServletRequest request,ServletResponse response) throws IOException; public void destroy(); }7、ServletRequestpackage com.qcby.lib; public interface ServletRequest { String getMethod(); String getPath(); String setMethod(String method); String setPath(String path); }8、ServletResponsepackage com.qcby.lib; import java.io.IOException; public interface ServletResponse { public void append(String context)throws IOException; }9、WebServletpackage com.qcby.lib; import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; Retention(RetentionPolicy.RUNTIME) //生命周期 Target(ElementType.TYPE) //作用范围 public interface WebServlet { String value(); }10、MyFirstServletpackage com.qcby.webapps.myweb; import com.qcby.lib.HttpServlet; import com.qcby.lib.ServletRequest; import com.qcby.lib.ServletResponse; import com.qcby.lib.WebServlet; import com.qcby.utils.ResponseUtil; import java.io.IOException; WebServlet(/first) public class MyFirstServlet extends HttpServlet { Override public void doGet(ServletRequest request, ServletResponse response) throws IOException { System.out.println(MyFirstServlet doGet 这里的地址); response.append(ResponseUtil.getResponseHeader200(h1这是第一个Servlet/h1)); } Override public void doPost(ServletRequest request,ServletResponse response){ } }11、MySecondServletpackage com.qcby.webapps.myweb; import com.qcby.lib.HttpServlet; import com.qcby.lib.ServletRequest; import com.qcby.lib.ServletResponse; import com.qcby.lib.WebServlet; import com.qcby.utils.ResponseUtil; import java.io.IOException; /** * 1.继承HttpServlet * 2.重写doGet()和doPost()方法 省略 * 3.WebServlet(/MySecondServlet) 配置访问路径 */ WebServlet(/second) public class MySecondServlet extends HttpServlet { Override public void doGet(ServletRequest request, ServletResponse response) throws IOException { System.out.println(MySecondServlet doGet 这里的地址); response.append(ResponseUtil.getResponseHeader200( h1SecondServlet/h1)); } Override public void doPost(ServletRequest request, ServletResponse response) { } }12、MyTomcatpackage com.qcby; import com.qcby.config.ServletConfigMapping; import com.qcby.lib.*; import com.qcby.utils.ResponseUtil; import java.io.IOException; import java.io.InputStream; import java.net.ServerSocket; import java.net.Socket; public class MyTomcat { private static HttpServletRequest httpServletRequest new HttpServletRequest(); private static HttpServletResponse httpServletResponse new HttpServletResponse(); private static final Integer PORT 7788; //监听的端口号 public static void start() throws Exception { ServerSocket serverSocket new ServerSocket(PORT); while (true) { Socket socket serverSocket.accept(); //阻塞监听 InputStream stream socket.getInputStream();//打开输出流 httpServletResponse.setOutputStream(socket.getOutputStream()); //获取输入流 handler(stream); } } /** * 处理客户端的请求数据并进行保持 * * param stream * throws IOException */ public static void handler(InputStream stream) throws Exception { int count 0; while (count 0) { count stream.available(); } byte[] bytes new byte[count]; int read stream.read(bytes); String request new String(bytes, 0, read); if (request.equals()) { System.out.println(请求为null); } else { String firstLine request.split(\n)[0]; String method firstLine.split(\\s)[0]; // 请求方式原代码存在变量名大小写错误firstline → firstLine String path firstLine.split(\\s)[1]; // 请求路径同变量名错误 System.out.println(请求方式 method 请求路径 path); httpServletRequest.setMethod(method); httpServletRequest.setPath(path); if (path.equals()) { System.out.println(请求路径为空); httpServletResponse.append(ResponseUtil.responseHeader404); } else if (ServletConfigMapping.classMapping.get(path) ! null) { // 虽然是用HttpServlet对象进行接受但是实际上我们返回的是MyFirstServlet/MySecondServlet/...... // HttpServlet 实际上是向上转型的产物 HttpServlet servlet ServletConfigMapping.classMapping.get(path); servlet.service(httpServletRequest, httpServletResponse); } else { httpServletResponse.returnStatic(path); } } } //tomcat启动器 public static void main(String[] args) throws Exception { start(); } }13、index.html!DOCTYPE html html langen head meta charsetUTF-8 titleTitle/title /head body h1hello world/h1 h1中文测试/h1 /body /html