使用 java替换web项目的web.xml

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创建一个接口：

package my.web;public interface SpringWeb {
void config();
}

实现类：

package my;import my.web.SpringWeb;public class SpringInit implements SpringWeb {
@Override
public void config() {
System.out.println("大家好");
}
}

import my.web.SpringWeb;public class SpringWeblnitializer implements SpringWeb {
@Override
public void config() {
System.out.println("你好，哈皮！");
}
}

创建：MyWebConfig 等同于web.xml

package my.web;import javax.servlet.ServletContainerInitializer;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.HandlesTypes;
import java.util.Set;// 等同于web.xml文件
@HandlesTypes({SpringWeb.class})
public class MyWebConfig implements ServletContainerInitializer {
@Override
public void onStartup(Set<Class<?>> set, ServletContext servletContext) throws ServletException {
System.out.println("hello wrold"); for (Class<?> aclass : set) {
SpringWeb o = null;
try{
o = (SpringWeb) aclass.newInstance();
o.config();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InstantiationException e) {
e.printStackTrace();
}
} }
}

创建一个servlet 继承于 HttpServlet

package my.web;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;@WebServlet("/aaa")
public class MyServlet extends HttpServlet { @Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.setContentType("text/html;charset=utf-8");
PrintWriter writer = resp.getWriter();
writer.write("。。。。。");
}
}

在src下创建 META-INF 包

其次在创建一个 services 的包添加一个filed的文件

//加上这一句目的项目在初始化自动找到web.xml文件
my.web.MyWebConfig