request常用获取信息的方法

servlet代码

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class DemoServlet extends HttpServlet {

	/**
	 * @see javax.servlet.http.HttpServlet#doGet(javax.servlet.http.HttpServletRequest,
	 *      javax.servlet.http.HttpServletResponse)
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		response.setCharacterEncoding("UTF-8");
		PrintWriter out = response.getWriter();
		out.println("------服务器信息------" + "<br>");
		out.println("获取请求的URL中指向请求上下文的那部分字符串【request.getContextPath()】:"
				+ request.getContextPath() + "<br>");
		out.println("获取请求使用的协议名【request.getScheme()】:" + request.getScheme()
				+ "<br>");
		out.println("获取请求使用的具体协议版本【request.getProtocol()】:"
				+ request.getProtocol() + "<br>");
		out.println("获取请求送往的服务器主机名【request.getServerName()】:"
				+ request.getServerName() + "<br>");
		out.println("获取请求送往的服务器端口号【request.getServerPort()】:"
				+ request.getServerPort() + "<br>");
		out.println("获取请求接收的主机地址【request.getLocalAddr()】:"
				+ request.getLocalAddr() + "<br>");
		out.println("获取请求接收的本地主机名【request.getLocalName()】:"
				+ request.getLocalName() + "<br>");
		out.println("获取请求接收的本地端口【request.getLocalPort():】"
				+ request.getLocalPort() + "<br>");
		out.println("获取请求的方法【request.getMethod():】" + request.getMethod()
				+ "<br>");
		out.println("获取请求URL从端口到请求参数中间的部分【request.getRequestURI():】"
				+ request.getRequestURI() + "<br>");
		out.println("获取请求URL【request.getRequestURL():】"
				+ request.getRequestURL() + "<br>");
		out.println("获取请求URL中访问servlet的那部分路径【request.getServletPath():】"
				+ request.getServletPath() + "<br>");
		out.println("获取给定虚拟路径在服务端的真实路径，从servlet3.0开始【request.getServletContext().getRealPath(‘/‘):】"
				+ request.getServletContext().getRealPath("/") + "<br>");
		out.println("获取给定虚拟路径在服务端的真实路径，从servlet2.3开始【request.getSession().getServletContext().getRealPath(‘/‘):】"
				+ request.getSession().getServletContext().getRealPath("/")
				+ "<br>");
		out.println("<br>");
		out.println("------客户端信息------" + "<br>");
		out.println("获取发送请求的客户端地址【request.getRemoteAddr():】"
				+ request.getRemoteAddr() + "<br>");
		out.println("获取发送请求的客户端主机名【request.getRemoteHost():】"
				+ request.getRemoteHost() + "<br>");
		out.println("获取发送请求的客户端端口【request.getRemotePort():】"
				+ request.getRemotePort() + "<br>");
		out.println("<br>");
		out.flush();
		out.close();
	}
}

web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
	<display-name>Archetype Created Web Application</display-name>
	<servlet>
		<servlet-name>DemoServlet</servlet-name>
		<display-name>This is the display name of my J2EE component</display-name>
		<description>This is the description of my J2EE component</description>
		<servlet-class>DemoServlet</servlet-class>
	</servlet>

	<servlet-mapping>
		<servlet-name>DemoServlet</servlet-name>
		<url-pattern>/servlet/DemoServlet</url-pattern>
	</servlet-mapping>
</web-app>

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>Demo.Web</groupId>
	<artifactId>Web-Snapshot</artifactId>
	<packaging>war</packaging>
	<version>1.0</version>
	<name>Web-Snapshot Maven Webapp</name>
	<url>http://maven.apache.org</url>
	<build>
		<finalName>Web-Snapshot</finalName>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-surefire-plugin</artifactId>
				<configuration>
					<includes>
						<include>**/*Test.class</include>
					</includes>
				</configuration>
			</plugin>
			<!-- compile plugins -->
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>2.3.1</version>
				<configuration>
					<source>1.6</source>
					<target>1.6</target>
					<encoding>UTF-8</encoding>
				</configuration>
				<dependencies>
					<dependency>
						<groupId>org.codehaus.plexus</groupId>
						<artifactId>plexus-compiler-javac</artifactId>
						<version>1.8.1</version>
					</dependency>
				</dependencies>
			</plugin>
		</plugins>
	</build>

	<dependencies>
		<!-- 单元测试 -->
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.12</version>
			<scope>test</scope>
		</dependency>
		<!-- servlet -->
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>javax.servlet-api</artifactId>
			<version>3.0.1</version>
			<scope>provided</scope>
		</dependency>
		<!-- jsp -->
		<dependency>
			<groupId>javax.servlet.jsp</groupId>
			<artifactId>jsp-api</artifactId>
			<version>2.2</version>
			<scope>provided</scope>
		</dependency>
		<!-- jstl -->
		<dependency>
			<groupId>taglibs</groupId>
			<artifactId>standard</artifactId>
			<version>1.1.2</version>
		</dependency>
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>jstl</artifactId>
			<version>1.1.2</version>
		</dependency>
	</dependencies>
</project>

其他运行环境信息

tomcat7

访问url：http://192.168.26.31/Web-Snapshot/servlet/DemoServlet

服务端ip：192.168.26.31

客户端ip：192.168.26.32

结果

------服务器信息------
获取请求的URL中指向请求上下文的那部分字符串【request.getContextPath()】:/Web-Snapshot
获取请求使用的协议名【request.getScheme()】:http
获取请求使用的具体协议版本【request.getProtocol()】:HTTP/1.1
获取请求送往的服务器主机名【request.getServerName()】:192.168.26.31
获取请求送往的服务器端口号【request.getServerPort()】:80
获取请求接收的主机地址【request.getLocalAddr()】:192.168.26.31
获取请求接收的本地主机名【request.getLocalName()】:GJB-PC
获取请求接收的本地端口【request.getLocalPort():】80
获取请求的方法【request.getMethod():】GET
获取请求URL从端口到请求参数中间的部分【request.getRequestURI():】/Web-Snapshot/servlet/DemoServlet
获取请求URL【request.getRequestURL():】http://192.168.26.31/Web-Snapshot/servlet/DemoServlet
获取请求URL中访问servlet的那部分路径【request.getServletPath():】/servlet/DemoServlet
获取给定虚拟路径在服务端的真实路径，从servlet3.0开始【request.getServletContext().getRealPath(‘/‘):】E:\java\apache-tomcat-7.0.55\webapps\Web-Snapshot获取给定虚拟路径在服务端的真实路径，从servlet2.3开始【request.getSession().getServletContext().getRealPath(‘/‘):】E:\java\apache-tomcat-7.0.55\webapps\Web-Snapshot
------客户端信息------
获取发送请求的客户端地址【request.getRemoteAddr():】192.168.26.32
获取发送请求的客户端主机名【request.getRemoteHost():】192.168.26.32
获取发送请求的客户端端口【request.getRemotePort():】52859