【原生JavaWeb】网页前端页面如何调用后端Java程序 |
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【原生JavaWeb】网页前端页面如何调用后端Java程序
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一、分层结构
action指定发送请求到的servlet类路径 method可指定响应的方法，默认为get方法 按下发送请求使用href也可以请求servlet类 href = "/hello"网页前端通过向Java程序的Servlet类，发送请求，来调用操作。有两种方法： （一）在web.xml文件中定义servlet类的请求路径，例如下： HelloServlet servlet.HelloServlet HelloServlet /hello （二）在Servlet类处，声明路径，例如下：@WebServlet(“/hello”) package servlet; 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("/hello") public class HelloServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println(""); out.println(""); out.println("Hello World!"); out.println(""); out.println(""); out.println("Hello Servlet Get!"); out.println(""); out.println(""); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println(""); out.println(""); out.println("Hello World!"); out.println(""); out.println(""); out.println("Hello Servlet Post!"); out.println(""); out.println(""); } } |
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