IDEA(2020版)实现HttpServletRequest对象

查看全文：IDEA(2020版)实现HttpServletRequest对象 – 每天进步一点点

 

IDEA(2020版)实现Servlet程序 – 每天进步一点点

IDEA(2020版)实现Servlet的生命周期 – 每天进步一点点

IDEA(2020版)实现ServletConfig和ServletContext – 每天进步一点点

IDEA(2020版)实现HttpServletResponse对象 – 每天进步一点点

本文主要介绍在IDEA中实现HttpServletResponse对象

源代码下载： https://box356.lanzoub.com/ij9CW2s8vp2h

1.获取请求行信息的相关方法

右击src—＞New—>Create New Servlet，名称就叫TestServlet4_17

代码参考如下：

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

import java.io.PrintWriter;

 

@WebServlet(name = "TestServlet4_17",value = "/test417")

public class TestServlet4_17 extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

response.setContentType("text/html;charset=utf-8");

PrintWriter out = response.getWriter();

// 获取请求行的相关信息

out.println("getMethod : " + request.getMethod() + "<br />");

out.println("getRequestURI : " + request.getRequestURI() + "<br />");

out.println("getQueryString:" + request.getQueryString() + "<br />");

out.println("getProtocol : " + request.getProtocol() + "<br />");

out.println("getContextPath:" + request.getContextPath() + "<br />");

out.println("getPathInfo : " + request.getPathInfo() + "<br />");

out.println("getPathTranslated : " + request.getPathTranslated() + "<br />");

out.println("getServletPath:" + request.getServletPath() + "<br />");

out.println("getRemoteAddr : " + request.getRemoteAddr() + "<br />");

out.println("getRemoteHost : " + request.getRemoteHost() + "<br />");

out.println("getRemotePort : " + request.getRemotePort() + "<br />");

out.println("getLocalAddr : " + request.getLocalAddr() + "<br />");

out.println("getLocalName : " + request.getLocalName() + "<br />");

out.println("getLocalPort : " + request.getLocalPort() + "<br />");

out.println("getServerName : " + request.getServerName() + "<br />");

out.println("getServerPort : " + request.getServerPort() + "<br />");

out.println("getScheme : " + request.getScheme() + "<br />");

out.println("getRequestURL : " + request.getRequestURL() + "<br />");

}

 

public void doPost(HttpServletRequest request,

HttpServletResponse response) throws ServletException,

IOException {

doGet(request, response);

}

}

在浏览器里输入下面的地址，注意和你实际的地址相匹配

http://localhost:8080/Servlet01_war_exploded/test417

运行结果如下：

2.获取请求头的相关方法

右击src,创建一个新的Servlet，名字为TestServlet4_18

代码参考如下：

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Enumeration;

 

@WebServlet(name = "TestServlet4_18",value = "/test418")

public class TestServlet4_18 extends HttpServlet {

public void doGet(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {

response.setContentType("text/html;charset=utf-8");

PrintWriter out = response.getWriter();

// 获取请求消息中所有头字段

Enumeration headerNames = request.getHeaderNames();

// 使用循环遍历所有请求头，并通过getHeader()方法获取一个指定名称的头字段

while (headerNames.hasMoreElements()) {

String headerName = (String) headerNames.nextElement();

out.print(headerName + " : "

+ request.getHeader(headerName) + "<br />");

}

}

 

public void doPost(HttpServletRequest request,

HttpServletResponse response) throws ServletException, IOException {

doGet(request, response);

}

}

然后访问地址参考如下：

http://localhost:8080/Servlet01_war_exploded/test418

结果如下：

3.请求转发

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