java中如何获取request请求的参数信息呢?
下文笔者讲述java代码获取request(get或post)中参数信息的方法分享，如下所示
前端页面
实现思路:
使用request对象的getParameter方法
即可获取指定参数的值
例:前端页面
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>测试java请求参数</h1>
<!-- 注意href和action都是写的完整的名称:项目名和资源路径名 -->
<!-- 下面一句是get请求方式并在URL后面传值 -->
<a href="/Web/TestServlet?p1=小儿&p2=99999999">点击这里</a>
<hr />
<form action="/Web/TestServlet" method="post">
用户名:<input type="text" name="username" /><br />
密 码:<input type="password" name="password" /><br />
性 别:<input type="radio" name="sex" checked="checked" value="男">男
<input type="radio" name="sex" value="女">女<br />
爱 好:<input type="checkbox" name="hobby" value="吃饭" />吃饭
<input type="checkbox" name="hobby" value="玩游戏" />玩游戏
<input type="checkbox" name="hobby" value="写代码" />写代码
<br/>
<input type="submit" value="提交" />
</form>
</body>
</html>
Servlet代码：
//后台代码
import java.io.IOException;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/*
* 演示request获取请求参数
*/
@WebServlet("/TestServlet")
public class TestServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
System.out.println("get:"+request.getParameter("p1"));
System.out.println("get:"+request.getParameter("p2"));
}
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
String username = request.getParameter("username");
String password = request.getParameter("password");
String[] hobby = request.getParameterValues("hobby");
System.out.println(username+","+password+","+Arrays.toString(hobby));
/*
* 测试获取所有请求参数的名称
*/
Enumeration<?> names2 = request.getParameterNames();
while(names2.hasMoreElements()){
System.out.println(names2.nextElement());
}
// Iterator<String> names = (Iterator<String>) request.getParameterNames();
// while(names.hasNext()){
// System.out.println(names.next());
// }
/*
* 获取所有请求参数，封装到Map中
*/
Map<String,String[]> map = (Map<String,String[]>)request.getParameterMap();
for(String name:map.keySet()){
String[] values = map.get(name);
System.out.println(name+"="+Arrays.toString(values));
}
}
}
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