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                ## 作用: * 獲取請求頭數據 * 獲取請求方式:`String method= request.getMethod();` * 獲取請求url:`StringBuffer url= request.getRequestURL();` * 獲取uri:`String uri = request.getRquestURI();` * 獲取協議:`String h = request.getScheme();` * 獲取請求行數據 * 獲取指定請求行信息:`String value = request.getHeader("Host");` * //獲取所有請求行的鍵的枚舉:見代碼ServletRequest.java * 獲取用戶數據:見代碼ServletRequest.java ## 代碼:ServletRequest.java ``` package com.igeek.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; /** * 獲取請求頭數據 獲取請求行數據 獲取用戶數據(重點) request.getParameter("鍵名")//返回指定的用戶數據 request.getParameterValue("鍵名")//返回同鍵不同值的請求數據(例如 多選框),返回的是數組 request.getParameterNames()//返回所有用戶數據的枚舉集合 注意: 如果要獲取的請求數據不存在,不會報錯,返回null * * Servlet implementation class ReqServlet */ public class ReqServlet extends HttpServlet { protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //獲取請求頭數據 //獲取請求方式 String method = request.getMethod(); System.out.println(method); //獲取請求url StringBuffer url = request.getRequestURL(); System.out.println(url); //獲取uri String urI= request.getRequestURI(); System.out.println(urI); //獲取協議 String h = request.getScheme(); System.out.println(h); //獲取請求行數據 //獲取指定請求行信息 String value = request.getHeader("Host"); System.out.println(value); //獲取所有請求行的鍵的枚舉 Enumeration e = request.getHeaderNames(); while(e.hasMoreElements()) { String name= (String)e.nextElement();//獲取鍵的名字 String value2=request.getHeader(name);//獲取鍵值 System.out.println(name+":"+value2);//輸出鍵值對 } //獲取用戶數據 String name = request.getParameter("uname"); String pwd = request.getParameter("pwd"); System.out.println(name+":"+pwd); String[] favs = request.getParameterValues("fav"); if(favs!=null) { for(String fav:favs) { System.out.println(fav); } } } } ``` ### 代碼:Method.jsp ``` <%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Insert title here</title> </head> <body> <form action="Req" method="get"> 用戶名:<input type="text" name="uname" value=""/><br/> 密碼:<input type="text" name="pwd" value=""/><br/> 愛好: <input type="checkbox" name="fav"/>籃球<br> <input type="checkbox" name="fav"/>乒乓球<br> <input type="checkbox" name="fav"/>滑板 <br> <input type="submit" value="登陸"/> </form> </body> </html> ```
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