request请求获取参数的实现方法(post和get两种方式)
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> <!-- 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/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));
}
}
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