Spring学习笔记二之练习AOP

一.需求

二.数据库

users表

三.搭环境

1.新建login web项目

2.导入相关jar包

3.WEB-INF下配置web.xml

（1）配置监听器，复制管理spring web容器

（2）将spring配置文件传过去

	
		contextConfigLocation
		classpath:applicationContext.xml
	
	
		org.springframework.web.context.ContextLoaderListener
	

4.src下配置applicationContext.xml

四.代码

1.pojo

Users

package com.bjsxt.pojo;

public class Users {
	private int id;
	private String username;
	private String password;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	
}

2.mapper

（1）UsersMapper.java（接口）

package com.bjsxt.mapper;

import com.bjsxt.pojo.Users;

public interface UsersMapper {
	Users selByUsers(Users users);
}

（2）UsersMapper.xml

（接口绑定原则）

	
		select * from users where username=#{username} and password=#{password}
	

3.service

UsersService.java

package com.bjsxt.service;

import com.bjsxt.pojo.Users;

public interface UsersService {
	Users login(Users users);
}

UsersServiceImpl.java

package com.bjsxt.service.impl;

import com.bjsxt.mapper.UsersMapper;
import com.bjsxt.pojo.Users;
import com.bjsxt.service.UsersService;

public class UsersServiceImpl implements UsersService {
	private UsersMapper usersMapper;
	public UsersMapper getUsersMapper() {
		return usersMapper;
	}
	public void setUsersMapper(UsersMapper usersMapper) {
		this.usersMapper = usersMapper;
	}
	@Override
	public Users login(Users users) {
		return usersMapper.selByUsers(users);
	}

}

4.servlet

LoginServlet.java

package com.bjsxt.servlet;

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;

import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import com.bjsxt.pojo.Users;
import com.bjsxt.service.UsersService;
import com.bjsxt.service.impl.UsersServiceImpl;

@WebServlet("/login")
public class LoginServlet extends HttpServlet {
	private UsersService usersService;
   
   //init（）方法对全局的usersService进行注入
	@Override
	public void init() throws ServletException {
		WebApplicationContext wac = WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext());

//usersService应该是usersServiceImpl，但是现在是代理，所以在配置文件中修改成cglib代理		
usersService = wac.getBean("usersService",UsersServiceImpl.class);
	}
	@Override
	protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		req.setCharacterEncoding("utf-8");
		Users users = new Users();
		users.setUsername(req.getParameter("username"));
		users.setPassword(req.getParameter("password"));
		Users user = usersService.login(users);
		if(user!=null){
			resp.sendRedirect("main.jsp");
		}else{
			resp.sendRedirect("login.jsp");
		}
	}
}

5.页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>








用户名:

密码:

6.advice

MyBefore.java

package com.bjsxt.advice;

import java.lang.reflect.Method;
import java.util.Date;

import org.apache.log4j.Logger;
import org.springframework.aop.MethodBeforeAdvice;

import com.bjsxt.pojo.Users;

public class MyBefore implements MethodBeforeAdvice {

	@Override
	public void before(Method arg0, Object[] arg1, Object arg2) throws Throwable {
		Users users = (Users) arg1[0];
		Logger logger = Logger.getLogger(MyBefore.class);
		logger.info(users.getUsername()+"在"+new Date().toLocaleString()+"进行登录");
	}

}

package com.bjsxt.advice;

import java.lang.reflect.Method;

import org.apache.log4j.Logger;
import org.springframework.aop.AfterReturningAdvice;

import com.bjsxt.pojo.Users;

public class MyAfter implements AfterReturningAdvice{

	@Override
	public void afterReturning(Object arg0, Method arg1, Object[] arg2, Object arg3) throws Throwable {
		Logger logger = Logger.getLogger(MyAfter.class);
		Users users = (Users) arg2[0];
		if(arg0!=null){
			logger.info(users.getUsername()+"登录成功!");
		}else{
			logger.info(users.getUsername()+"登录失败!");
		}
	}

}

7.在src下配置log4j.properties

log4j.rootCategory=INFO, CONSOLE ,LOGFILE

log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%m %n

log4j.appender.LOGFILE=org.apache.log4j.FileAppender
log4j.appender.LOGFILE.File=E:/my.log
log4j.appender.LOGFILE.Append=true
log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout
log4j.appender.LOGFILE.layout.ConversionPattern=%m %n