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@WebServlet("/RequestDemo01")
public class RequestDemo01 extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    //        System.out.println(req);
    //1.获取请求方式
    System.out.println("Request Method "+req.getMethod());
    //2.获取项目路径
    System.out.println("Project Path "+req.getContextPath());
    //3.获取URI
    System.out.println("URI "+req.getRequestURI());
    //4.获取URL
    System.out.println("URI "+req.getRequestURL());
    //5.协议和版本
    System.out.println("Protocol & Version "+ req.getProtocol());
    //6.客户端IP
    System.out.println("IP "+ req.getRemoteAddr());}

  @Override
  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
  }
}

@WebServlet("/RequestDemo02")
public class RequestDemo02 extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    //获取所有请求头名称
    Enumeration<String> headerNames = req.getHeaderNames();
    //遍历
    while (headerNames.hasMoreElements()){
      //取出元素名(请求头名称)
      String name = headerNames.nextElement();
      //根据名称获取值
      String value = req.getHeader(name);
      System.out.println(value);
    }
  }
  @Override
  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
  }
}

@WebServlet("/RefereRequest")
public class RefereRequest extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    //0.设置编码，让中文不乱码
    resp.setContentType("text/html;charset=UTF-8");
    //1.获取请求来源(如果是浏览器地址栏直接访问，referer是Null)
    String referer = req.getHeader("referer");
    //2.判断是否自己网站发起的请求
    if(referer != null && referer.startsWith("http://127.0.0.1:8080")){
      resp.getWriter().write("Play Video");
    }else {
      resp.getWriter().write("Permission Denied");
    }
  }
  @Override
  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
  }
}

@WebServlet("/UserAgentRequest")
public class UserAgentRequest extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    //0.设置语言编码
    resp.setContentType("text/html;charset=UTF-8");
    //1.获取浏览器版本信息
    String useragent = req.getHeader("user-agent");
    //2.判断浏览器版本
    System.out.println(useragent);
    if (useragent.contains("Chrome")){
      System.out.println("Chrome");
    }else if (useragent.contains("Firefox")){
      System.out.println("Firefox");
    }else {
      System.out.println("Others");
    }
  }
  @Override
  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
  }
}

@WebServlet("/RequestDemo03")
public class RequestDemo03 extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    //Get manually
    //        String username = req.getParameter("username");
    //        System.out.println(username);
    //        String password = req.getParameter("password");
    //        System.out.println(password);
    //        String[] hobbies = req.getParameterValues("hobby");
    //        System.out.println(Arrays.toString(hobbies));
    //Automatic acquisition
    Map<String, String[]> parameterMap = req.getParameterMap();
    parameterMap.forEach((k, v) -> {
      System.out.println(k + "" + Arrays.toString(v));
    });
  }

  @Override
  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    req.setCharacterEncoding("UTF-8");
    //使用方法一样，可以直接调用get方法
    this.doGet(req, resp);
  }
}

public class User {
  private String username;
  private String password;
  private String[] hobby;

  // 此处省略getter setter toString

  @WebServlet("/RequestDemo04")
  public class RequestDemo04 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
      //Get manually
      String username = req.getParameter("username");
      System.out.println(username);
      String password = req.getParameter("password");
      System.out.println(password);
      String[] hobbies = req.getParameterValues("hobby");
      //Automatic acquisition
      Map<String, String[]> parameterMap = req.getParameterMap();
      parameterMap.forEach((k, v) -> {
        System.out.println(k + "" + Arrays.toString(v));
      });
      //将前端表单数据赋值到user对象中,保存到数据库
      User user = new User();
      user.setUsername(username);
      user.setPassword(password);
      user.setHobby(hobbies);
      System.out.println(user);
    }
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
      req.setCharacterEncoding("UTF-8");
      //使用方法一样，可以直接调用get方法
      this.doGet(req, resp);

      //使用BeanUtils快速封装数据到User对象中
      //map集合的key,必须为JavaBean属性名
      Map<String, String[]> parameterMap = req.getParameterMap();
      //
      User user = new User();
      try {
        BeanUtils.populate(user, parameterMap);
      } catch (IllegalAccessException e) {
        e.printStackTrace();
      } catch (InvocationTargetException e) {
        e.printStackTrace();
      }
      System.out.println(user);
    }
  }

//成员变量名username
private String username;


//属性Username，是方法的命名
public String getUsername() {
  return username;
}

//属性是getter/setter方法截取之后的产物
//通常情况下,使用IDEA自动生成getter&setter时，变量名 equals 属性
getUsername-Username-username

  //不一样的情况
  //成员变量名
  private String user;
//属性名
public String getUsername() {
  return user;
}

@WebServlet("/AServlet")
public class AServlet extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    this.doPost(req,resp);
  }
  @Override
  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    //转发到BServlet
    //1.获取转发器对象 path=@WebServlet("/BServlet")
    //        RequestDispatcher requestDispatcher = req.getRequestDispatcher("/BServlet");
    //2.实现转发功能
    //        requestDispatcher.forward(req,resp);
    //AServlet存一个数据
    req.setAttribute("name","This is A Object");

    //链式编程
    req.getRequestDispatcher("/BServlet").forward(req,resp);
  }
}

@WebServlet("/BServlet")
public class BServlet extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    this.doPost(req,resp);
  }
  @Override
  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    resp.getWriter().write("B");
    String name = (String) req.getAttribute("name");
    resp.getWriter().write(name);
  }
}

@WebServlet("/RequestDemo05")
public class RequestDemo05 extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    //获取当前web项目对象
    ServletContext servletContext = req.getServletContext();
  }
  @Override
  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
  }
}

public class User {
  private String username;
  private String password;
  //此处getter & setter ，toString省略
}


@WebServlet("/loginServlet")
public class LoginServlet extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    this.doPost(req, resp);
  }
  @Override
  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    //1.设置request解码方式
    req.setCharacterEncoding("UTF-8");
    //2.获取浏览器参数，map集合
    Map<String, String[]> parameterMap = req.getParameterMap();
    //3.使用BeanUtils工具类，封装到User中
    User user = new User();
    try {
      BeanUtils.populate(user, parameterMap);
    } catch (IllegalAccessException e) {
      e.printStackTrace();
    } catch (InvocationTargetException e) {
      e.printStackTrace();
    }

    //4.判断(写一个file文件，存储真实到用户名密码，判断)
    if ("jack".equals(user.getUsername()) && "123".equals(user.getPassword())){
      req.setAttribute("user",user);
      req.getRequestDispatcher("/successServlet").forward(req, resp);
    }else{
      req.getRequestDispatcher("/failedServlet").forward(req, resp);
    }
  }
}


@WebServlet("/successServlet")
public class SuccessServlet extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    this.doPost(req, resp);
  }
  @Override
  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    //1.从request域获取user对象
    User user = (User) req.getAttribute("user");
    //2.提示
    resp.setContentType("text/html;charset=utf-8");
    resp.getWriter().write(user.getUsername()+"Successful");
  }
}
@WebServlet("/failedServlet")
public class FailedServlet extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    this.doPost(req, resp);
  }
  @Override
  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    resp.setContentType("text/html;charset=utf-8");
    resp.getWriter().write("Login Failed,Wrong Username or Password");
  }
}

#if (${PACKAGE_NAME} && ${PACKAGE_NAME} != "")package ${PACKAGE_NAME};#end #parse("File Header.java") @javax.servlet.annotation.WebServlet("/${Class_Name}")
public class ${Class_Name} extends javax.servlet.http.HttpServlet {
protected void doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, java.io.IOException {
this.doPost(request,response); }
protected void doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, java.io.IOException {

} }

public class QuickServlet implements Servlet {
  @Override
  public void init(ServletConfig servletConfig) throws ServletException {}

  @Override
  public ServletConfig getServletConfig() {
    return null;
  }

  //对外提供服务
  /*
request:代表请求
response:代表响应
 */
  @Override
  public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
    //向浏览器写一句话
    servletResponse.getWriter().write("QuickServlet");
  }

  //表示当前Servlet对象的描述信息
  @Override
  public String getServletInfo() {
    return "快速入门";
  }

  @Override
  public void destroy() {

  }}

//servlet对象创建时,调用此方法
@Override
public void init(ServletConfig servletConfig) throws ServletException {
  System.out.println("LifeServlet Created");
}

//用户访问servlet时,调用此方法
@Override
public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
  System.out.println("LifeServlet carried out");
}

//servlet对象销毁时,调用此方法
@Override
public void destroy() {
  System.out.println("LifeServlet destroy");
}

public class LifeServlet implements Servlet {
  @Override
  public void init(ServletConfig servletConfig) throws ServletException {
    System.out.println("LifeServlet Created");
  }

  @Override
  public ServletConfig getServletConfig() {
    return null;
  }

  @Override
  public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
    System.out.println("LifeServlet carried out");
  }

  @Override
  public String getServletInfo() {
    return null;
  }

  @Override
  public void destroy() {
    System.out.println("LifeServlet destroy");
  }
}

public class EncodingServlet implements Servlet {
  //定义全局变量
  private ServletConfig servletConfig;
  @Override
  public void init(ServletConfig servletConfig) throws ServletException {
    this.servletConfig = servletConfig;
  }

  @Override
  public ServletConfig getServletConfig() {
    return servletConfig;
  }

  //用户访问,执行service方法
  @Override
  public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
    //        String encode = "UTF-8";
    //        servletResponse.getWriter().write(encode);
    String encode = getServletConfig().getInitParameter("encode");
    servletResponse.getWriter().write(encode);
  }
  @Override
  public String getServletInfo() {
    return null;
  }

  @Override
  public void destroy() {

  }
}

public class ServletDemo01 extends GenericServlet {
  @Override
  public void init() throws ServletException {
    System.out.println("ServletDemo01 Created");
  }

  @Override
  public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
    super.getServletConfig();//调用父类的配置对象
    servletResponse.getWriter().write("ServletDemo01 extends GenericServlet");
  }

  @Override
  public void destroy() {
    System.out.println("ServletDemo01 Destroyed");
  }
}

public class ServletDemo02 extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    resp.getWriter().write("Get");
  }
  @Override
  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    resp.getWriter().write("Post");
  }
}

//父类方法
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
  String protocol = req.getProtocol();
  String msg = lStrings.getString("http.method_get_not_supported");
  if (protocol.endsWith("1.1")) {
    resp.sendError(405, msg);
  } else {
    resp.sendError(400, msg);
  }
}

public class ServletDemo03 extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    resp.getWriter().write("ServletDemo3 Get Method Run");
  }
  @Override
  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    resp.getWriter().write("ServletDemo3 Post Method Run");
  }
}

public class ServletDemo04 extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    resp.getWriter().write("ServletDemo4 Get Method Run");
  }
  @Override
  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    resp.getWriter().write("ServletDemo4 Post Method Run");
  }
}

public class ServletDemo05 extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    resp.getWriter().write("ServletDemo5 Get Method Run");
  }@Override
  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    resp.getWriter().write("ServletDemo5 Post Method Run");
  }
}

@WebServlet("/QuickServlet")
public class QuickServlet extends HttpServlet {
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    resp.getWriter().write("Quick Servlet 3.0 Get Method");
  }@Override
  protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
    resp.getWriter().write("Quick Servlet 3.0 Post Method");
  }}