HttpServletRequest
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <form action="/WEB06/LineServlet" method="get"> <input type="text" name="username"><br> <input type="password" name="pwd"><br> <input type="submit" value="提交"> </form> </body> </html> ------------------------------------ package com.oracle.demo01; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class LineServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //4．通过request获得请求行里面的信息 // 获取请求方式 String method=request.getMethod(); System.out.println("Request mode is" + Method); // Get request the URI String the URI = Request.getRequestURI (); System.out.println ( "as the URL" + the URI); // Get the URL the StringBuffer the URL = request.getRequestURL (); System.out.println ( "as the URL of" + the URL of); // Gets WEB application name String name = request.getContextPath (); System.out.println ( "WEB application name is" + name); // get get request after string URL string Query = request.getQueryString (); System.out.println ( "GET request parameters:" + Query); // Get the IP address of the client String IP = request.getRemoteAddr (); System.out.println ( "IP address:" + IP); } public void the doPost (the HttpServletRequest Request, the HttpServletResponse Response) throws ServletException, IOException { the doGet ( Request, Response); } }
request acquisition request header
The role of anti-hotlinking do referer header
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <!-- 防盗链 --> <a href="/WEB06/RefereServlet">宋仲基和宋慧乔分手了</a> </body> </html> --------------------------------package com.oracle.demo01; javax.servlet.ServletException; Importjava.io.IOException; Importby anti-hotlinking request of// import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class RefereServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 获取refere头 String refere=request.getHeader("Referer"); String content=null; // 判断是否以谁开头 必须加上http:// if(refere.startsWith("http://localhost:8080")) { Content = "really divorced!" ; } The else { Content = "You are a thief" ; } // solve the Chinese garbled response response.setContentType ( "text / HTML; charset = UTF-8" ); response .getWriter () Write (Content);. } public void the doPost (the HttpServletRequest Request, the HttpServletResponse Response) throws ServletException, IOException { the doGet (Request, Response); } }
Obtaining request through the request body
To the above parameters, for example, access to request parameters by what method:
String getParameter(String name)
String[] getParameterValues(String name)
Enumeration getParameterNames()
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <form action="/WEB06/BodyServlet" method="post"> <input type="text" name="username"> <input type="radio" name="sex" value="woman">女 <input type="radio" name="sex" value="man">男 <br> <input type="checkbox" name="hobby" value="pqq"> 乒乓球 <input type="checkbox" name="hobby" value="pq"> 皮球 <input type="checkbox" name="hobby" value="wq"> 网球 <br> <input type="submit" value="提交"> </form> </body> </html> -------------------------------------------- package com.oracle.demo01; //request获得请求体的方法获得参数 import java.io.IOException; import java.util.Map; import java.util.Set; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; importjavax.servlet.http.HttpServletResponse; Import javax.swing.plaf.synth.SynthSeparatorUI; public class BodyServlet the extends the HttpServlet { public void the doGet (the HttpServletRequest Request, the HttpServletResponse Response) throws ServletException, IOException { // POST request addressed to solve the Chinese garbled is a distortion in the request body Request.setCharacterEncoding ( "UTF-. 8" ); // Get request parameter // 1. obtain a single value parameter value is used to retrieve a single method getParameter String name = request. getParameter ( "username" );
// GET submission solve the garbage
= new new String name (name.getBytes ( "the ISO-8859-1"), "UTF-. 8"); String Sex = request.getParameter ( "Sex" ); System.out.println (name + "..." + Sex); // 2. obtaining a plurality of values String [] = hobbys Request. the getParameterValues ( "Hobby" ); // iterate for (String S: hobbys) { System.out.println (S); } // . 3 Get all request parameters the Map the Map <String, String []> = Map request. getParameterMap (); // iterate the Set <String> SET = map.keySet (); for(String str:set){ String[] value=map.get(str); for(String v:value){ System.out.println(str+"..."+v); } } } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); } }
Resolve post submission Chinese garbled : request.setCharacterEncoding ( "UTF-8" );
Resolve get submitted garbled : parameter = new String (parameter.getbytes ( "iso8859-1"), "utf-8");
Most people will not bother with this
