• Spring的学习和源码的学习


     

    PS:Spring中有各种的Templeate,比如jdncTemplate,主要是为了避免各种模板的代码,抽象出来的

    PS: 

    PS: @Configration、@Bean是用来替代xml那种解析方式

    ----------------------------------------------------------------------------------------------------------

    PS: ApplicatonContext加载所有的bean,加载原则的get/set

    PS:Spring管理下 bean的声明周期

     PS:Spring4 的模块

     

    PS: 建议使用自动装配的机制

    PS: @Component 会默认以类名第一个字母小写作为id名字,  表明该类会作为组件类

    PS: @ComponentScan会默认扫描该类子包所有Component的bean

    @Component泛指组件,当组件不好归类的时候,我们可以使用这个注解进行标注。
    @component (把普通pojo实例化到spring容器中,相当于配置文件中的 
    <bean id="" class=""/>

    PS: @Componet只适合单独bean的状态,无依赖,如果说是bean和bean之间有依赖的话,还是要用Autowired(也就是Bean中Bean)

    spring注解中的@Autowired和@Component区别

    @Autowried 和 @inject可以互换

    PS: 传统装配的类型

    PS: 有些第三方的类无法装配bean,就只能使用java代码装配了。也就是之前的并不可能解决所有的问题。

     

    PS: 并不是所有的场景都可以自动的装配的,这时候就得使用 xml配置或者 Java(JavaConfig是替代Java更好的解决方案)配置了

     

    JavaConfig

    1.创建配置类 @Configration(如果ComponentScan去掉就不报错,还必须使用@Bean把对象注入进去)

    2.声明bean  @Bean

    3.借助JavaConfig实现注入

    package soundsystem;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    
    @Configuration
    public class CDPlayerConfig {
      
      @Bean
      public CompactDisc compactDisc() {
        return new SgtPeppers();
      }
      
      @Bean
      public CDPlayer cdPlayer(CompactDisc compactDisc) {
        return new CDPlayer(compactDisc);
      }
    
    }

     通过xml装配bean

    @Import

     

     

    PS: 根据环境的变化,修改配置文件

    package com.myapp;
    
    import javax.sql.DataSource;
    
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.context.annotation.Profile;
    import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseBuilder;
    import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType;
    import org.springframework.jndi.JndiObjectFactoryBean;
    
    @Configuration
    public class DataSourceConfig {
      
      @Bean(destroyMethod = "shutdown")
      @Profile("dev")
      public DataSource embeddedDataSource() {
        return new EmbeddedDatabaseBuilder()
            .setType(EmbeddedDatabaseType.H2)
            .addScript("classpath:schema.sql")
            .addScript("classpath:test-data.sql")
            .build();
      }
    
      @Bean
      @Profile("prod")
      public DataSource jndiDataSource() {
        JndiObjectFactoryBean jndiObjectFactoryBean = new JndiObjectFactoryBean();
        jndiObjectFactoryBean.setJndiName("jdbc/myDS");
        jndiObjectFactoryBean.setResourceRef(true);
        jndiObjectFactoryBean.setProxyInterface(javax.sql.DataSource.class);
        return (DataSource) jndiObjectFactoryBean.getObject();
      }
    
    }
    <?xml version="1.0" encoding="UTF-8"?>
    <beans xmlns="http://www.springframework.org/schema/beans"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:jdbc="http://www.springframework.org/schema/jdbc"
      xmlns:jee="http://www.springframework.org/schema/jee" xmlns:p="http://www.springframework.org/schema/p"
      xsi:schemaLocation="
        http://www.springframework.org/schema/jee
        http://www.springframework.org/schema/jee/spring-jee.xsd
        http://www.springframework.org/schema/jdbc
        http://www.springframework.org/schema/jdbc/spring-jdbc.xsd
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">
    
      <beans profile="dev">
        <jdbc:embedded-database id="dataSource" type="H2">
          <jdbc:script location="classpath:schema.sql" />
          <jdbc:script location="classpath:test-data.sql" />
        </jdbc:embedded-database>
      </beans>
      
      <beans profile="prod">
        <jee:jndi-lookup id="dataSource"
          lazy-init="true"
          jndi-name="jdbc/myDatabase"
          resource-ref="true"
          proxy-interface="javax.sql.DataSource" />
      </beans>
    </beans>

    @Conditional 

     --------------------------在Autowired的时候会存在歧义

    PS: 使用@Primary 和@Qualifier

    PS: prototype就是多例

    @Scope

    ----------运行时注入,读取配置文件

    @ProtertySource

    ---------------------------------------------------------------------------

     例子是抄电表

    Spring AOP详解

     

    PS: 重点!!!!!!!!!!!!     这五种方式说明何时调用通知

     

     

    PS: 这两个是一样的

     

    PS: home 视图解析, home将会被解析为/WEB-INF/views/home.jsp

    PS:春河说的校验表单参数

     

    package spittr;
    
    import javax.validation.constraints.NotNull;
    import javax.validation.constraints.Size;
    
    import org.apache.commons.lang3.builder.EqualsBuilder;
    import org.apache.commons.lang3.builder.HashCodeBuilder;
    import org.hibernate.validator.constraints.Email;
    
    public class Spitter {
    
      private Long id;
      
      @NotNull
      @Size(min=5, max=16)
      private String username;
    
      @NotNull
      @Size(min=5, max=25)
      private String password;
      
      @NotNull
      @Size(min=2, max=30)
      private String firstName;
    
      @NotNull
      @Size(min=2, max=30)
      private String lastName;
      
      @NotNull
      @Email
      private String email;
    
      public Spitter() {}
      
      public Spitter(String username, String password, String firstName, String lastName, String email) {
        this(null, username, password, firstName, lastName, email);
      }
    
      public Spitter(Long id, String username, String password, String firstName, String lastName, String email) {
        this.id = id;
        this.username = username;
        this.password = password;
        this.firstName = firstName;
        this.lastName = lastName;
        this.email = email;
      }
    
      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;
      }
    
      public Long getId() {
        return id;
      }
    
      public void setId(Long id) {
        this.id = id;
      }
    
      public String getFirstName() {
        return firstName;
      }
    
      public void setFirstName(String firstName) {
        this.firstName = firstName;
      }
    
      public String getLastName() {
        return lastName;
      }
    
      public void setLastName(String lastName) {
        this.lastName = lastName;
      }
      
      public String getEmail() {
        return email;
      }
      
      public void setEmail(String email) {
        this.email = email;
      }
    
      @Override
      public boolean equals(Object that) {
        return EqualsBuilder.reflectionEquals(this, that, "firstName", "lastName", "username", "password", "email");
      }
      
      @Override
      public int hashCode() {
        return HashCodeBuilder.reflectionHashCode(this, "firstName", "lastName", "username", "password", "email");
      }
    
    }

     

     

     PS: 看公司代码

    PS:自定义异常处理
    通常是使用

    @ControllerAdvice

    PS: 这个就是 执行的顺序, 有点类似Activity

    PS: 使用spring 的拦截器,只用一个就行 了。

    PS: 可以在测试 和 调试阶段添加  验证账户

     

     ----------------------------------------Spring源码学习

    PS:学习的代码是spring 3.2

     PS:阅读源码最好的办法就是跟着  事例 操作一遍

    PS: XMLBeanFactory继承自 1,  而 1 是整个bean加载的核心部分;

     

    -------------------------------------------------------------------------------------------------------------------------------

     

     

     PS: SpringMVC是基于Servlet功能实现的

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  • 原文地址:https://www.cnblogs.com/bee-home/p/10011368.html
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