HttpServlet可作为前后端接口
- 框架结构
- 文件结构
在src下的后端逻辑代码com.atguigu.servlet.AddServlet
web下的静态资源文件(可包括html、css、js)add.html
web/WEB-INFO下的资源配置文件web.xml
代码(AddServlet.java、add.html、web.xml)
package com.atguigu.servlets;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
* @author JayerListen
* @create 2022-06-30 2022/6/30
*/
public class AddServlet extends HttpServlet {
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse resp) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
String fname = request.getParameter("fname");
String priceStr = request.getParameter("price");
Integer price = Integer.parseInt(priceStr);
String fcountStr = request.getParameter("fcount");
Integer fcount = Integer.parseInt(fcountStr);
String remark = request.getParameter("remark");
System.out.println(fname);
System.out.println(priceStr);
System.out.println(fcountStr);
System.out.println(remark);
}
}
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="add" method="post">
名称：<input type="text" name="fname"/><br/>
价格：<input type="text" name="price"/><br/>
库存：<input type="text" name="fcount"/><br/>
备注：<input type="text" name="remark"/><br/>
<input type="submit" value="添加" />
</form>
</body>
</html>
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<servlet>
<servlet-name>AddServlet</servlet-name>
<servlet-class>com.atguigu.servlets.AddServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>AddServlet</servlet-name>
<url-pattern>/add</url-pattern>
</servlet-mapping>
<!--
1. 用户发请求，action=add
2. 项目中，web.xml中找到url-pattern = /add -> 第12行
3. 找第11行的servlet-name = AddServlet
4. 找和servlet-mapping中servlet-name一致的servlet ， 找到第7行
5. 找第8行的servlet-class -> com.atguigu.servlets.AddServlet
6. 用户发送的是post请求（method=post） ， 因此 tomcat会执行AddServlet中的doPost方法
-->
</web-app>
