servlet獲取參數和返回響應
在web目錄下新建login.html
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>login</title>
</head>
<body>
<form action="login" method="post">
<b>id: </b><input type="text" name="userid"><br>
<b>pass: </b><input type="password" name="userpass" ><br>
<input type="submit" value="登陸"><br>
</form>
</body>
</html>
編寫ServletLogin類
package j2ee;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoginServlet extends HttpServlet{
public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException {
String id = request.getParameter("userid");
String pass = request.getParameter("userpass");
System.out.println(id);
System.out.println(pass);
PrintWriter pw = response.getWriter();
pw.println(id);
pw.println(pass);
}
}
在web.xml文件中加入
<servlet>
<servlet-name>LoginServlet</servlet-name>
<servlet-class>j2ee.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>
訪問：http://127.0.0.1:8080/login.html，輸入id和pass
可以看到跳轉到的http://127.0.0.1:8080/login以及Tomcat控制檯上都會顯示輸入的id和pass