多个Servlet写成一个Servlet
作者：互联网
1.创建一个BaseServlet
它不用于访问将@WebServlet("/baseServlet")删去
package cn.itcast.travel.web.servlet;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class BaseServlet extends HttpServlet {
@Override
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//System.out.println("baseServlet的service方法");
//完成方法分发
//1.获取请求路径
String uri= request.getRequestURI();// /user/add
System.out.println("请求uri"+uri);// /user/add
//2.获取方法名称
String methodName=uri.substring(uri.lastIndexOf('/')+1);
System.out.println("方法名称"+methodName);
// 请求uri/travel/user/add
// 方法名称add
//3.获取方法的对象
System.out.println(this);
//UserServlet的对象cn.itcast.travel.web.servlet.UserServlet@3aa08509
try {
Method method=this.getClass().getMethod(methodName,HttpServletRequest.class,HttpServletResponse.class);
//4.执行方法
method.invoke(this,request,response);
} catch (NoSuchMethodException e) {
e.printStackTrace();} catch (IllegalAccessException ex) {
ex.printStackTrace();
} catch (InvocationTargetException ex) {
ex.printStackTrace();
}
}
}
2.CategoryServlet
主要是进行测试。（我个人认为，不确定）
package cn.itcast.travel.web.servlet;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebServlet(name = "/category/*")//这种写法是使用该类下的所有方法
public class CategoryServlet extends BaseServlet {
public void add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("categoryServlet的add方法");
}
public void find(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("categoryServlet的find方法");
}
}
3.UserServlet
访问改成@WebServlet("/user/*") 。继承于BaseServlet。
package cn.itcast.travel.web.servlet;
import cn.itcast.travel.domain.ResultInfo;
import cn.itcast.travel.domain.User;
import cn.itcast.travel.service.UserService;
import cn.itcast.travel.service.impl.UserServiceImpl;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.commons.beanutils.BeanUtils;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.util.Map;
@WebServlet("/user/*") // /user/find
public class UserServlet extends BaseServlet {
private UserService service = new UserServiceImpl();
//注册功能
public void regist(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//验证校验
String check = request.getParameter("check");
//从sesion中获取验证码
HttpSession session = request.getSession();
String checkcode_server = (String) session.getAttribute("CHECKCODE_SERVER");
session.removeAttribute("CHECKCODE_SERVER");//为了保证验证码只能使用一次
//比较
if(checkcode_server == null || !checkcode_server.equalsIgnoreCase(check)){
//验证码错误
ResultInfo info = new ResultInfo();
//注册失败
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);
ResultInfo info = new ResultInfo();
//4.响应结果
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 json = 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(json);
}
//登录功能
public void login(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//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);
ResultInfo info = new ResultInfo();
//4.判断用户对象是否为null
if (u == null) {
//用户名密码或错误
info.setFlag(false);
info.setErrorMsg("用户名密码或错误");
}
//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())) {
request.getSession().setAttribute("user", u);//登录成功标记
//登录成功
info.setFlag(true);
}
//响应数据，将resultINFO转为json数据，序列化到客户端
ObjectMapper mapper = new ObjectMapper();
response.setContentType("application/json;charset=utf-8");
mapper.writeValue(response.getOutputStream(), info);
}
//查找一个对象
public void findOne(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1.获取用户名和密码数据
//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);
}
//退出功能
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");
}
//激活账号
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){
//激活成功
msg = "激活成功，请<a href='login.html'>登录</a>";
}else{
//激活失败
msg = "激活失败，请联系管理员!";
}
response.setContentType("text/html;charset=utf-8");
response.getWriter().write(msg);
}
}
}
4.在每个HTML页面所有调用servlet更改名称
改成user/servlet名称。
标签：info,多个,Servlet,request,user,import,写成,servlet,response 来源： https://blog.csdn.net/qq_44893424/article/details/118254256