BaseServlet抽取
优化Servlet
减少Servlet的数量，现在是一个功能一个Servlet，将其优化为一个模块一个Servlet，
相当于在数据库中一张表对应一个Servlet，在Servlet中提供不同的方法，完成用户的请求。
UserServlet类：
@WebServlet("/user/*")
public class UserServlet extends BaseServlet {
public void add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("userServlet的add方法");
}
public void find(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("userServlet的find方法");
}
}
BaseServlet类：
public class BaseServlet extends HttpServlet {
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//System.out.println("BaseServlet的service方法被执行");
//完成方法分发
//1、获取请求路径
String uri = req.getRequestURI();
System.out.println("请求的uri："+uri);
//2、获取方法名称
String methodName = uri.substring(uri.lastIndexOf("/") + 1);
System.out.println("方法名称："+methodName);
//3、获取方法对象
try {
Method method = this.getClass().getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
//4、执行方法
method.invoke(this,req,resp);
} catch (NoSuchMethodException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
}
}
UserServlet和页面路径改写
UserServlet类：
@WebServlet("/user/*")
public class UserServlet extends BaseServlet {
//声明Userservice业务对象
private UserService service = new UserServiceImpl();
/**
* 注册功能
* @param request
* @param response
* @throws ServletException
* @throws IOException
*/
public void regist(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//验证校验
String check = request.getParameter("check");
//从session中获取验证码
HttpSession session = request.getSession();
String checkcode_server = (String) session.getAttribute("CHECKCODE_SERVER");
//为了保证验证码只能使用一次
session.removeAttribute("CHECKCODE_SERVER");
//比较
if (checkcode_server==null || !checkcode_server.equalsIgnoreCase(check)){
//验证码错误
ResultInfo info = new ResultInfo();
info.setFlag(false);
info.setErrorMsg("验证码错误");
//将info对象序列化为json
ObjectMapper mapper = new ObjectMapper();
String json = mapper.writeValueAsString(info);
response.setContentType("application/json;charset=utf-8");
response.getWriter().write(json);
return;
}
//1、获取数据
Map<String, String[]> map = request.getParameterMap();
//2、封装对象
User user = new User();
try {
BeanUtils.populate(user,map);
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
//3、调用service完成注册
//UserService service = new UserServiceImpl();
boolean flag = service.regist(user);
//4、响应结果
ResultInfo info = new ResultInfo();
if (flag){
//注册成功
info.setFlag(true);
}else {
//注册失败
info.setFlag(false);
info.setErrorMsg("注册失败");
}
//将info对象序列化为json
ObjectMapper mapper = new ObjectMapper();
String string = mapper.writeValueAsString(info);
//将json数据写回客户端
//设置content-type
response.setContentType("application/json;charset=utf-8");
response.getWriter().write(string);
}
/**
* 登录功能
* @param request
* @param response
* @throws ServletException
* @throws IOException
*/
public void login(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//获取验证码
String check = request.getParameter("check");
//从session中获取验证码
HttpSession session = request.getSession();
String checkcode_server = (String) session.getAttribute("CHECKCODE_SERVER");
//保证验证码只能使用一次
session.removeAttribute("CHECKCODE_SERVER");
//判断
if (checkcode_server == null || !checkcode_server.equalsIgnoreCase(check)){
//验证码错误
ResultInfo info = new ResultInfo();
info.setFlag(false);
info.setErrorMsg("验证码错误");
//将info对象序列化为json
ObjectMapper mapper = new ObjectMapper();
String json = mapper.writeValueAsString(info);
response.setContentType("application/json;charset=utf-8");
response.getWriter().write(json);
return;
}
//1、获取用户名和密码数据
Map<String, String[]> map = request.getParameterMap();
//2、封装User对象
User user = new User();
try {
BeanUtils.populate(user,map);
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
//3、调用Service查询
//UserService service = new UserServiceImpl();
User u = service.login(user);
session.setAttribute("user",u);
ResultInfo info = new ResultInfo();
//4、判断用户对象是否存在
if(u==null){
//用户名密码错误
info.setFlag(false);
info.setErrorMsg("用户名或密码错误");
}
//5、判断用户是否激活
if(u != null && !"Y".equals(u.getStatus())){
//用户尚未激活
info.setFlag(false);
info.setErrorMsg("您尚未激活，请激活");
}
//6、判断登录成功
if (u!=null && "Y".equals(u.getStatus())){
info.setFlag(true);
}
//响应数据
ObjectMapper mapper = new ObjectMapper();
response.setContentType("application/json;charset=utf-8");
mapper.writeValue(response.getOutputStream(),info);
}
/**
* 查找一个
* @param request
* @param response
* @throws ServletException
* @throws IOException
*/
public void findOne(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//从session中获取登录用户
Object user = request.getSession().getAttribute("user");
//将user写回客户端
ObjectMapper mapper = new ObjectMapper();
response.setContentType("application/json;charset=utf-8");
mapper.writeValue(response.getOutputStream(),user);
}
/**
* 退出
* @param request
* @param response
* @throws ServletException
* @throws IOException
*/
public void exit(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1、销毁session
request.getSession().invalidate();
//2、跳转登录页面
response.sendRedirect(request.getContextPath()+"/login.html");
}
/**
* 激活功能
* @param request
* @param response
* @throws ServletException
* @throws IOException
*/
public void active(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1、获取激活码
String code = request.getParameter("code");
if (code!=null){
//2、调用service完成激活
//UserService service = new UserServiceImpl();
boolean flag = service.active(code);
//3、判断标记
String msg = null;
if (flag){
msg = "激活成功，请<a href='/travel/login.html'>登录</a>";
}else {
msg = "激活失败，请联系管理员";
}
response.setContentType("text/html;charset=utf-8");
response.getWriter().write(msg);
}
}
}
修改页面路径：
regist.html页面：
$(function () {
$("#registerForm").submit(function () {
//发送数据到服务器
if (checkUsername() && checkPassword() && checkEmail()){
//校验通过发送ajax请求，提交表单的数据
$.post("user/regist",$(this).serialize(),function (data) {
//处理服务器响应的数据
if(data.flag){
//注册成功，跳转成功页面
location.href = "register_ok.html";
}else {
$("#errorMsg").html(data.errorMsg);
}
});
}
return false;
});
header.html页面：
<script>
$(function () {
$.get("user/findOne",{},function (data) {
var msg = "欢迎回来,"+data.name;
$("#span_username").html(msg);
});
});
</script>
login.html页面：
<script>
//1、给登录按钮绑定单击事件
$(function () {
$("#btn_sub").click(function () {
//2、发送ajax请求，提交表单数据
$.post("user/login",$("#loginForm").serialize(),function (data) {
//3、处理响应数据
if (data.flag){
//登录成功
location.href="index.html";
}else {
//登录失败
$("#errorMsg").html(data.errorMsg);
}
});
});
});
</script>
UserServiceImpl实现类：
/**
* 注册用户
* @param user
* @return
*/
@Override
public boolean regist(User user) {
//根据用户名查询用户对象
User u = userDao.findByUsername(user.getUsername());
//判断u是否为null
if (u!=null){
//用户名已存在，注册失败
return false;
}
//保存用户信息
//设置激活码。唯一字符串
user.setCode(UuidUtil.getUuid());
//设置激活状态
user.setStatus("N");
userDao.save(user);
//激活邮件发送
String content = "<a href='http://localhost/travel/user/active?code="+user.getCode()+"'>点击激活【旅游网】</a>";
MailUtils.sendMail(user.getEmail(),content,"激活邮件");
return true;
}
标签：info,BaseServlet,UserServlet,request,throws,user,new,response,页面 From： https://www.cnblogs.com/xjw12345/p/16620171.html