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HttpServletRequest获取提交表单参数(五)

2017-11-15 20:12 627 查看

(一)代码演示

HttpServletRequest的方法：https://www.gnu.org/software/classpathx/servletapi/javadoc/javax/servlet/http/HttpServletRequest.html

<!DOCTYPE html>
<html>
<head>
<meta  http-equiv="Content-Type" content="text/html" charset="UTF-8">
<title>演示01</title>
</head>
<body>
<form  action="/Project01/DemoServlet" method="post">
用户名：<input  type="text"  name="username"><br/>
密  码：<input  type="password"  name="password"><br/>
爱好：<input  type="checkbox"  name="hobby" value="sing">唱歌
<input  type="checkbox"  name="hobby" value="dance">跳舞
<input  type="checkbox"  name="hobby" value="football">
4000
足球 <br>
<input type="submit" value="提交">
</form>
</body>
</html>

----------
package com.demo;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class DemoServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}

protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

String name = request.getParameter("username");
String password = request.getParameter("password");
PrintWriter out = response.getWriter();
out.println("用户名：" + name);
out.println("密码：" + password);
String[] hobbys = request.getParameterValues("hobby");
for (int i = 0; i < hobbys.length; i++) {
out.println(hobbys[i] );
}

}
}

----------
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>Project01</display-name>
<servlet>
<!-- servlet-name名任意取 -->
<servlet-name>demo</servlet-name>
<!--servlet-class填写(包名.类名)  -->
<servlet-class>com.demo.DemoServlet</servlet-class>

</servlet>
<servlet-mapping>
<servlet-name>demo</servlet-name>
<!-- Servlet的多重映射 -->
<url-pattern>/DemoServlet</url-pattern>

</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>

</welcome-file-list>
</web-app>

(二)结果演示

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