request请求获取参数(post和get两种方式)

拼搏现实的明天。 2022-08-07 08:52 243阅读 0赞

提交表单代码：

<!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
    <h1>测试请求参数</h1>
    
    
    <a href="/Web/AAServlet?xxx=王大炮&yyy=123456">点击这里</a>
    <hr />
    
    <form action="/Web/AAServlet" 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="睡觉" />睡觉
    		  <input type="checkbox" name="hobby" value="打代码" />打代码
    	<br/>
    	<input type="submit" value="提交" />
    	</form>
    </body>
    </html>

Servlet代码:

package request请求获取Post或者get参数;
    
    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("/AAServlet")
    public class AAServlet extends HttpServlet {
    	private static final long serialVersionUID = 1L;
    
    	protected void doGet(HttpServletRequest request,
    			HttpServletResponse response) throws ServletException, IOException {
    		System.out.println("get:"+request.getParameter("xxx"));
    		System.out.println("get:"+request.getParameter("yyy"));
    	}
    
    	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));
    			}
    		}
    
    }