本系列博客汇总在这里:请求对象 request 和响应对象 response 汇总
目录
- request 的 getParameterName 方法详解
request 的 getParameterName 方法详解
之前我们获取值都是建立在预先知道传过来的值得名称已知的情况下,那么,要是不知道值得名称呢?例如动态表单。
示例
HelloServlet
web.xml
1.html
结果以上操作完整源码
HelloServletpackage com.wyx.servlet;
import java.io.IOException;
import java.util.Enumeration;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class HelloServlet extends HttpServlet
{
/**
* getParameterNames用于获得表单中文本域的所有的name,适合动态表单
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
{
// 获得表单中所有的文本域的name
Enumeration<String> paramNames = request.getParameterNames();
while (paramNames.hasMoreElements())
{
// 获得每一个文本域的name
String paraName = paramNames.nextElement();
// 根据文本域的name来获得值
String[] paraValues = request.getParameterValues(paraName);
// 输出文本域的name
System.out.print(paraName + ":");
// 输出相应文本域的值
for (String paraVal : paraValues)
{
System.out.print(paraVal + " ");
}
System.out.println();
}
}
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException
{
doGet(req, resp);
}
}web.xml
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
<servlet-name>HelloServlet</servlet-name>
<servlet-class>com.wyx.servlet.HelloServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloServlet</servlet-name>
<url-pattern>/hello</url-pattern>
</servlet-mapping>
</web-app>1.html
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>表单方式来提交数据</h1>
<form action="/reqresp_demo2/hello" method="post">
姓名:<input name="name" type="text"><br>
年龄:<input name="age" type="text"><br>
性别:<input name="gender" type="radio" value="1">男
<input name="gender" type="radio" value="0">女
<br>
职位:<select name="job">
<option value="1">教授</option>
<option value="2">副教授</option>
</select>
<br>
简介:<textarea rows="10" cols="20" name="introduce"></textarea>
<br>
爱好:<input name="favor" type="checkbox" value="1">篮球
<input name="favor" type="checkbox" value="2">足球
<input name="favor" type="checkbox" value="3">羽毛球
<br>
<input type="submit" value="提交">
</form>
</body>
</html>工程文件下载
如有错误,欢迎指正!