GET /webDemo/Hellow HTTP/1.1  //請求行
Host: localhost:8080      //請求頭
Connection: keep-alive
Accept: text/html
Accept-Encoding: gzip, deflate, sdch, br
Accept-Language: zh-CN,zh;q=0.8
                //空行
                //實體內容

HTTP/1.1 200 OK       //響應行
Server: Apache-Coyote/1.1  //相應頭
Content-Length: 0
Date: Thu, 18 May 2017 13:21:23 GMT
              //空行
              //實體內容

//HttpServletRequest對象的常見方法
//請求行：
  request.getMethod(); //獲取請求的提交方式
  request.getRequestURI(); //獲取請求的URI
  request.getProtocol(); //獲取請求的協(xié)議

//請求頭：
  request.getHeader();  //獲取請求頭的強求值
  request.getHeaderName(); //獲取請求頭的所有名稱

//實體內容：
  request.getInputStream(); //獲取實體內容的輸入流

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)建一個字符串來存儲請求信息
    StringBuffer req = new StringBuffer();

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

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

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

    req.append("\n");
    //獲取實體內容
    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HttpServletResponse對象，改變響應信息
   * */
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

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

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

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


    //4、通過修改響應頭，來請求重定向
    //發(fā)送要給302狀態(tài)碼，location的響應頭
    /*
    當瀏覽器認識到302狀態(tài)碼的時候，會再次自動向服務器發(fā)出一個請求，請求的地址就是location的value值 
    請求重定向，一共向服務器發(fā)出2次請求
     */
    resp.setStatus(302);
    resp.setHeader("location","/webDemo/index.html");

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

    //5、通過修改響應頭，來實現定時刷新頁面
    //一秒后刷新頁面
    resp.setHeader("refresh","1");

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

    //6、通過修改響應頭，來修改服務端和客戶端的傳輸的數據類型
    //resp.setHeader("content-type","text/html")

    //也可以直接調用setContentType方法直接設置
    //在web.xml文件中找到對應的數據類型寫法
    resp.setContentType("text/html");

  }

}

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

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

  //根據指定名字來獲取參數值
    request.getParameter("name");
    request.getParameter("password");

    //獲取所有參數名字
    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"/>