javaWEB总结(7):HttpServlet和HttpServletRequest

package com.dao.chu; import java.io.IOException; import java.io.PrintWriter; import java.util.Arrays; import java.util.Enumeration; import java.util.Map; import java.util.Map.Entry; import java.util.Set; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * * <p> * Title: HttpRequestDemo Description:继承了HttpServlet的测试类 * </p> */ public class HttpRequestDemo extends HttpServlet { /** serialVersionUID */ private static final long serialVersionUID = 1L; // 得到请求的URL地址 String requestUrl = ""; // 得到请求行中的资源部分 String requestUri = ""; // 得到请求的URL地址中附带的参数 String queryString = ""; // 得到来访者的IP地址 String remoteAddr = ""; // 来访者主机名 String remoteHost = ""; // 客户机所使用的网络端口号 int remotePort = 0; // 得到请求方式GET/POST String method = ""; // 获取WEB服务器的IP地址 String localAddr = ""; // 获取WEB服务器的主机名 String localName = ""; String remoteUser=""; /** * 继承了HttpServlet的service方法 */ @Override protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("调用了service方法"); //调用公共输出方法 commonPrint(request, response); //依旧调用父类的方法 super.service(request, response); } /** * 继承了HttpServlet的doGet方法 */ @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("调用了doGet方法"); //调用公共输出方法 commonPrint(request, response); } /** * 继承了HttpServlet的doPost方法 */ @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("调用了doPost方法"); //调用公共输出方法 commonPrint(request, response); } /** * Title: commonPrint * Description:公共输出方法 * @param request * @param response */ private void commonPrint(HttpServletRequest request, HttpServletResponse response) { // 设置将字符以"UTF-8"编码输出到客户端浏览器 response.setCharacterEncoding("UTF-8"); // 通过设置响应头控制浏览器以UTF-8的编码显示数据，如果不加这句话，那么浏览器显示的将是乱码 response.setHeader("content-type", "text/html;charset=UTF-8"); requestUrl = request.getRequestURL().toString(); requestUri = request.getRequestURI(); queryString = request.getQueryString(); remoteAddr = request.getRemoteAddr(); method = request.getMethod(); localAddr = request.getLocalAddr(); localName = request.getLocalName(); PrintWriter out; try { out = response.getWriter(); out.write("<hr/>"); out.write("（1）获取客户机信息："); out.write("<br/>"); out.write("请求的URL地址：" + requestUrl); out.write("<br/>"); out.write("请求的资源：" + requestUri); out.write("<br/>"); out.write("请求的URL地址中附带的参数：" + queryString); out.write("<br/>"); out.write("来访者的IP地址：" + remoteAddr); out.write("<br/>"); out.write("来访者的主机名：" + remoteHost); out.write("<br/>"); out.write("使用的端口号：" + remotePort); out.write("<br/>"); out.write("请求的方式：" + method); out.write("<br/>"); out.write("服务器的IP地址：" + localAddr); out.write("<br/>"); out.write("服务器的主机名：" + localName); // 获取的客户机的请求头信息 out.write("<br/>"); out.write("<hr/>"); out.write("（2）获取客户机的请求头信息："); out.write("<br/>"); // 得到所有请求头名组成的Enumeration Enumeration<String> headerNames = request.getHeaderNames(); // 循环 while (headerNames.hasMoreElements()) { // 得到所有的请求头名 String headerName = (String) headerNames.nextElement(); // 根据请求头名得到所有请求头值 String headerValue = request.getParameter(headerName); out.write(headerName + ": " + headerValue); out.write("<br/>"); } // 获取的客户机的请求信息 out.write("<br/>"); out.write("<hr/>"); out.write("（3）获取客户机的请求信息："); out.write("<br/>"); // 获取参数名和参数值的String[]组成的键值对 Map<String, String[]> map = request.getParameterMap(); Set<Entry<String, String[]>> entrySet = map.entrySet(); for (Entry<String, String[]> entry : entrySet) { out.write(entry.getKey() + "： " + Arrays.asList(entry.getValue())); out.write("<br/>"); } } catch (IOException e) { e.printStackTrace(); } } }