Java Spring

Spring框架:更快速地开发更高效的开发,融合了多种框架的容器

编写实体类

package com.huang.pojo;

public class User {
    private String Name;

    public String getName() {
        return Name;
    }

    public void setName(String name) {
        Name = name;
    }

    @Override
    public String toString() {
        return "User{" +
                "Name='" + Name + ''' +
                '}';
    }
}

编写配置文件

编写测试类

import com.huang.pojo.User;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MyTest {
    @Test
    public void text(){
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        User hello = (User) context.getBean("hello");
        System.out.println(hello.toString());
    }
}

Dao接口

package com.huang.Dao;

public interface UserDao {
    void getName();
}

package com.huang.Dao;

public class UserDaoImpl implements UserDao{
    @Override
    public void getName() {
        System.out.println("正常的sql");
    }
}

package com.huang.Dao;

public class UserDaoMysqlImpl implements UserDao{
    @Override
    public void getName() {
        System.out.println("这是一个mysql");
    }
}

Service接口

package com.huang.service;

public interface UserService {
    void getUser();
}

package com.huang.service;

import com.huang.Dao.UserDao;

public class UserServiceImpl implements UserService{
    private UserDao userDao;

    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }

    @Override
    public void getUser() {
        userDao.getName();
    }
}

spring配置文件编写

编写测试类

import com.huang.service.UserServiceImpl;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MyTest {
    @Test
    public void text(){
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        UserServiceImpl userService = (UserServiceImpl) context.getBean("UserService");
        userService.getUser();
    }
}

package com.huang.pojo;

import java.util.Date;

public class User {
    private int id;
    private String name;
    private Date times;

    public User(int id, String name, Date times) {
        this.id = id;
        this.name = name;
        this.times = times;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Date getTimes() {
        return times;
    }

    public void setTimes(Date times) {
        this.times = times;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + ''' +
                ", times=" + times +
                '}';
    }
}

编写Spring配置文件

编写测试类

import com.huang.pojo.User;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MyTest {
    @Test
    public void getHello1(){
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        User id = (User) context.getBean("hello1");
        System.out.println(id.toString());
    }
    @Test
    public void getHello2(){
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        User id = (User) context.getBean("hello2");
        System.out.println(id.toString());
    }
    @Test
    public void getHello3(){
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        User id = (User) context.getBean("he1");
        System.out.println(id.toString());
    }
    @Test
    public void getHello4(){
        ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
        User id = (User) context.getBean("h1");
        System.out.println(id.toString());
    }
}

    
        
        
        
    
    
        
        
        
        
        
        
            
                语文
                数学
                英语
                物理
            
        
        
        
            
                听歌
                看书
                游戏
            
        
        
        
            
        
        
        
            
                lol
                cs
                DNF
            
        
        
        
            
                asdffs
                sisisisis
                zaissai
            
        
    
    
    
    
    

Spring 自动装配Bean

@Autowired  自动装配通过类型和名字
    如果Autowired 不能唯一自动装配上属性;
@Nullable 字段标记了这个注解 说明这个字段可以null;
@Resource 自动装配通过名字 类型
    
衍生的注解
dao [@Repository]
service [@Service]
controller [@Controller]
这四个注解功能是一样的,都是代表某个类注册到Spring中 装配

方法二需要的类

package com.huang.diy;

public class DiyPoinCut {
    public void before(){
        System.out.println("----方法执行前------");
    }
    public void after(){
        System.out.println("------方法执行后-----");
    }
}

方法一种需要的类

package com.huang.log;

import org.springframework.aop.AfterReturningAdvice;

import java.lang.reflect.Method;

public class AfterLog implements AfterReturningAdvice {
    @Override
    public void afterReturning(Object returnValue, Method method, Object[] args, Object target) throws Throwable {
        System.out.println(returnValue);
    }
}

package com.huang.log;

import org.springframework.aop.MethodBeforeAdvice;

import java.lang.reflect.Method;

public class BeforeLog implements MethodBeforeAdvice {
    //method: 要执行的目标对象的方法
    //args: 参数
    //target: 目标对象
    @Override
    public void before(Method method, Object[] args, Object target) throws Throwable {
        System.out.println(target.getClass().getName() + method.getName());
    }
}

测试类

import com.huang.service.UserService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MyText {
    @Test
    public void text(){
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserService userService = context.getBean("UserService", UserService.class);
        userService.select();
    }
}

mybatis配置文件

Spring配置文件

Mapper接口

package com.huang.mapper;

import com.huang.pojo.Blog;

import java.util.List;

public interface BlogMapper {
    List getBlog();
}

    
        SELECT * FROM `school`.`blog`
    

编写Spring调用的类

package com.huang.mapper;

import com.huang.pojo.Blog;
import org.mybatis.spring.SqlSessionTemplate;

import java.util.List;

public class BlogMapperImpl implements BlogMapper{
    private SqlSessionTemplate sqlSession;

    public void setSqlSession(SqlSessionTemplate sqlSession) {
        this.sqlSession = sqlSession;
    }

    @Override
    public List getBlog() {
        BlogMapper mapper = sqlSession.getMapper(BlogMapper.class);
        return mapper.getBlog();
    }
}

测试类

import com.huang.mapper.BlogMapper;
import com.huang.pojo.Blog;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.io.IOException;
import java.util.List;


public class MyText {
    @Test
    public void getBlog() throws IOException {
        ApplicationContext context = new ClassPathXmlApplicationContext("spring-Dao.xml");
        BlogMapper blogMapper = context.getBean("blogMapper", BlogMapper.class);
        List blogs = blogMapper.getBlog();
        for (Blog blog : blogs) {
            System.out.println(blog);
        }
    }
    @Test
    public void getBlog2() throws IOException {
        ApplicationContext context = new ClassPathXmlApplicationContext("spring-Dao.xml");
        BlogMapper blogMapper = context.getBean("blogMapper2", BlogMapper.class);
        List blogs = blogMapper.getBlog();
        for (Blog blog : blogs) {
            System.out.println(blog);
        }
    }
}