GET /webDemo/Hellow HTTP/1.1  //請(qǐng)求行
Host: localhost:8080      //請(qǐng)求頭
Connection: keep-alive
Accept: text/html
Accept-Encoding: gzip, deflate, sdch, br
Accept-Language: zh-CN,zh;q=0.8
                //空行
                //實(shí)體內(nèi)容

HTTP/1.1 200 OK       //響應(yīng)行
Server: Apache-Coyote/1.1  //相應(yīng)頭
Content-Length: 0
Date: Thu, 18 May 2017 13:21:23 GMT
              //空行
              //實(shí)體內(nèi)容

//HttpServletRequest對(duì)象的常見(jiàn)方法
//請(qǐng)求行：
  request.getMethod(); //獲取請(qǐng)求的提交方式
  request.getRequestURI(); //獲取請(qǐng)求的URI
  request.getProtocol(); //獲取請(qǐng)求的協(xié)議

//請(qǐng)求頭：
  request.getHeader();  //獲取請(qǐng)求頭的強(qiáng)求值
  request.getHeaderName(); //獲取請(qǐng)求頭的所有名稱

//實(shí)體內(nèi)容：
  request.getInputStream(); //獲取實(shí)體內(nèi)容的輸入流

package sun;

import java.io.IOException;
import java.io.InputStream;
import java.util.Enumeration;

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

/**
 * Servlet implementation class Hellow
 */
@WebServlet("/Hellow")
public class GetRequestInfo extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    //創(chuàng)建一個(gè)字符串來(lái)存儲(chǔ)請(qǐng)求信息
    StringBuffer req = new StringBuffer();

    //獲取請(qǐng)求行
    //獲取請(qǐng)求方法，URI，HTTP版本 
    req.append(request.getMethod()+" "+request.getRequestURI()+" "+request.getProtocol()+"\n");

    //獲取請(qǐng)求頭
    //獲取所有請(qǐng)求頭
    Enumeration<?> headerName = request.getHeaderNames();
    while(headerName.hasMoreElements()){
      String header= (String)headerName.nextElement();
      req.append(header+": ");

      //獲取指定請(qǐng)求頭的值
      Enumeration<?> headerValue = request.getHeaders(header);
      while(headerValue.hasMoreElements()){
        req.append((String)headerValue.nextElement()+";");
      }
      req.append("\n");
    }

    req.append("\n");
    //獲取實(shí)體內(nèi)容
    InputStream input = request.getInputStream();
    byte[] buffer = new byte[1024];
    int len = 0;
    while((len=input.read(buffer))!=-1){
      String str = new String(buffer,0,len);
      req.append(str);
    }
    //輸出請(qǐng)求信息
    System.out.println(req);
  }

}

package sun;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class Response
 */
@WebServlet("/Response")
public class ModifyResponseInfo extends HttpServlet {


  /**
   * Description:
   * 通過(guò)HttpServletResponse對(duì)象，改變響應(yīng)信息
   * */
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

    //1、修改響應(yīng)行
    resp.setStatus(404);
    //resp.sendError(404);

    //2、修改響應(yīng)頭
    resp.setHeader("Server","JBoss");

    //3、修改實(shí)體內(nèi)容
    //發(fā)送字符類型的實(shí)體內(nèi)容
    resp.getWriter().write("response");
    //發(fā)送字節(jié)類型的實(shí)體內(nèi)容
    resp.getOutputStream().write("response".getBytes());


    //4、通過(guò)修改響應(yīng)頭，來(lái)請(qǐng)求重定向
    //發(fā)送要給302狀態(tài)碼，location的響應(yīng)頭
    /*
    當(dāng)瀏覽器認(rèn)識(shí)到302狀態(tài)碼的時(shí)候，會(huì)再次自動(dòng)向服務(wù)器發(fā)出一個(gè)請(qǐng)求，請(qǐng)求的地址就是location的value值 
    請(qǐng)求重定向，一共向服務(wù)器發(fā)出2次請(qǐng)求
     */
    resp.setStatus(302);
    resp.setHeader("location","/webDemo/index.html");

    //也可以直接調(diào)用sendRedirect方法直接重定向
    //resp.sendRedirect("/webDemo/adv.html");

    //5、通過(guò)修改響應(yīng)頭，來(lái)實(shí)現(xiàn)定時(shí)刷新頁(yè)面
    //一秒后刷新頁(yè)面
    resp.setHeader("refresh","1");

    //也可以定時(shí)重定向頁(yè)面
    //resp.setHeader("refresh","1;url=/webDemo/index.html");

    //6、通過(guò)修改響應(yīng)頭，來(lái)修改服務(wù)端和客戶端的傳輸?shù)臄?shù)據(jù)類型
    //resp.setHeader("content-type","text/html")

    //也可以直接調(diào)用setContentType方法直接設(shè)置
    //在web.xml文件中找到對(duì)應(yīng)的數(shù)據(jù)類型寫(xiě)法
    resp.setContentType("text/html");

  }

}

//獲取GET方式參數(shù)：
request.getQueryString();

//獲取POST方式參數(shù)：
request.getInputStream();

  //根據(jù)指定名字來(lái)獲取參數(shù)值
    request.getParameter("name");
    request.getParameter("password");

    //獲取所有參數(shù)名字
    Enumeration<String> params = request.getParameterNames();
    while(params.hasMoreElements()){
      String param = params.nextElement();
      String value = request.getParameter(param);
    }

name = new String(name.getBytes("iso-8859-1"),"utf-8");

<!-- A "Connector" represents an endpoint by which requests are received
     and responses are returned. Documentation at :
     Java HTTP Connector: /docs/config/http.html (blocking & non-blocking)
     Java AJP Connector: /docs/config/ajp.html
     APR (HTTP/AJP) Connector: /docs/apr.html
     Define a non-SSL/TLS HTTP/1.1 Connector on port 8080
  -->
  <!--在這里，加上屬性URIEncoding，及指定編碼值-->
  <Connector connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443" URIEncoding="utf-8"/>