package com.aaa.service;
import java.util.List;
import java.util.Map;
public interface IStudentService {
List<Map<String,Object>> listAll();
}
package com.aaa.service.impl;
import com.aaa.dao.IStudentDAO;
import com.aaa.dao.impl.StudentDAOImpl;
import com.aaa.service.IStudentService;
import java.util.List;
import java.util.Map;
/**
* @author: hy
* @create: 2022-07-26 12:06:00
*/
public class StudentServiceImpl implements IStudentService {
private IStudentDAO studentDAO=new StudentDAOImpl();
@Override
public List<Map<String, Object>> listAll() {
return null;
}
}
package com.aaa.servlet;
import com.aaa.service.IStudentService;
import com.aaa.service.impl.StudentServiceImpl;
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;
import java.util.List;
import java.util.Map;
/**
* @author: hy
* @create: 2022-07-26 11:45:15
*/
@WebServlet(urlPatterns = "/xxx") //配置当前servlet处理的映射请求地址
public class TestServlet extends HttpServlet {
//如果一个java程序想要处理web请求，必须实现Servlet接口
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
IStudentService studentService = new StudentServiceImpl();
List<Map<String,Object>> list = studentService.listAll();
//拼接html页面
StringBuilder myhtml = new StringBuilder();
myhtml.append("<html>");
myhtml.append("<head>");
myhtml.append("<title>my page</title>");
myhtml.append("</head>");
myhtml.append("<body><h1>我的页面 aaa page</h1></body>");
myhtml.append("</html>");
//使用打印输出流对象，将html内容，输出给浏览器客户端
PrintWriter out = resp.getWriter();
out.println(myhtml);
out.flush();
out.close();
}
}
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