Spring框架总结 - 掠过的岁月

公告

一 spring常用的三种注入方式(setter方法注入，构造器注入，自动装配)

1 setter方法注入，在类中一定要写属性的setter方法。

1 <bean  id="helloword"  class="com.wengde.spring.bean.HelloWord">
2     <property name="name2" value="wangwu"></property>
3 </bean>

1  <bean id="person" class="com.wengde.spring.bean.Person" scope="singleton">
2      <property name="name" value="zhangsan"></property>
3      <property name="age" value="26"></property>
4      <property name="car" ref="car2"></property>
5 </bean>

id是bean的名字，具有唯一性，在同一个xml文件中id名字不能重复，class是全类名，所以必须要有无参构造器。name是类的属性名，也就是要和类的属性名一致。通过scope(singleton,prototype,request,session)来决定bean的作用域。通过ref来映射其他的bean。

2 构造器注入

1 <bean id="car" class="com.wengde.spring.bean.Car">
2     <constructor-arg value="Baoma" index="0"></constructor-arg>
3     <constructor-arg value="red" index="1"></constructor-arg>
4     <constructor-arg value="3000" type="double"></constructor-arg>
5 </bean>

如果出现构造器参数个数一样的重载构造器，可以通过type来区分构造器参数的类型。

3 自动装配，通过注解@@Autowired 注入，可以用于属性（不用再写setter方法），构造器和setter方法

1 public class TestBean12 {  
2     @Autowired //字段注入  
3     private String message;  
4     //省略getter和setter  
5 }

二、依赖注入——自动装配

在应用中，我们常常使用<ref>标签为JavaBean注入它依赖的对象,同时也Spring为我们提供了一个自动装配的机制，在定义Bean时，<bean>标签有一个autowire属性，我们可以通过指定它来让容器为受管JavaBean自动注入依赖对象。

自动装配是在配置文件中实现的，如下：<bean id="***" class="***" autowire="byType">

1.byName：按名称装配可以根据属性的名称在容器中查询与该属性名称相同的bean，也就是bean的id值要和类的属性名称一致，如果没有找到，则属性值为null。假设Person类中有一个名为car和address的属性，如果容器中刚好有一个名为car和adress的Bean，Spring就会自动将其装配给Boss的car属性。

 1  <bean id="address" class="com.wengde.spring.autowire.Address">
 2      <property name="city" value="shenzhen"></property>   
 3      <property name="street" value="huangnikan"></property>   
 4  </bean>
 5  <bean id="car" class="com.wengde.spring.autowire.Car" >
 6      <property name="pingpa" value="baoma"></property>
 7      <property name="price" value="300000"></property>
 8  </bean>
 9  <bean id="person" class="com.wengde.spring.autowire.Person" autowire="byName">
10     <property name="name" value="lijing"></property>
11  </bean>

2.byType：按类型装配可以根据属性类型，在容器中寻找该类型匹配的bean，如有多个，则会抛出异常，如果没有找到，则属性值为null。假设Boss类中有一个Car类型的属性，如果容器中刚好有一个Car类型的Bean，Spring就会自动将其装配给Boss的这个属性。

根据属性Property的数据类型自动装配，这种情况，Customer设置了autowire="byType"，Spring会总动寻找与属性类型相同的bean，找到后，通过调用setPerson(Person person)将其注入。

1 <bean id="customer" class="com.lei.common.Customer" autowire="byType" />
2 <bean id="person" class="com.lei.common.Person" />

如果配置文件中有两个类型相同的bean会怎样呢？如下：

1 <bean id="customer" class="com.lei.common.Customer" autowire="byType" />
2 <bean id="person" class="com.lei.common.Person" />
3 <bean id="person_another" class="com.lei.common.Person" />

一旦配置如上，有两种相同数据类型的bean被配置，将抛出UnsatisfiedDependencyException异常，见以下：
Exception in thread "main" org.springframework.beans.factory.UnsatisfiedDependencyException:
所以，一旦选择了“byType”类型的自动装配，请确认你的配置文件中每个数据类型定义一个唯一的bean。

三集合参数注入

list集合

 1 <bean id="personlist" class="com.wengde.spring.bean.Personlist">
 2    <property name="name" value="ligaojing" ></property>
 3    <property name="age" value="30"></property>
 4    <property name="car" >
 5       <list>
 6         <ref bean="car"/>
 7         <ref bean="car2"/>
 8       </list>
 9    </property>
10    </bean>

1 <!-- 注入List类型属性 -->
2 <bean id="boss" class="com.spring.model.Boss">  
3     <property name="favorites">
4         <list>
5             <value>看报</value>
6             <value>赛车</value>
7             <value>高尔夫</value>
8         </list>
9     </propert

set集合

1 <bean id=”……” class=”……”>
2     <property name="……">
3         <set>  
4             <value>value1</value>  
5             <value>value2</value>  
6             ……  
7         </set>
8     </property>
9 </bean>

map集合：需要使用<map>标签来配置注入，其属性“key-type”和“value-type”分别指定“键”和“值”的数据类型。

1 <bean id="boss1" class="com.spring.model.Boss">  
2     <property name="jobs">
3         <map>
4             <entry key="AM" value="会见客户" />
5             <entry key="PM" value="公司内部会议" />
6         </map>
7     </property>
8 </bean>

Properties：需要使用<props>标签来配置注入，键和值类型必须是String，不能变，子标签<prop key=”键”>值</prop>来指定键值对。

1 <!-- 注入Properties类型属性 -->
2 <bean id="boss2" class="com.spring.model.Boss">  
3     <property name="mails">
4         <props>
5             <prop key="jobMail">john-office@163.com</prop>
6             <prop key="lifeMail">john-life@163.com</prop>
7         </props>
8     </property>
9 </bean>

四静态工厂和实例工厂的配置

静态工厂的配置

 1 package com.wengde.spring.factory;
 2 
 3 import java.util.HashMap;
 4 import java.util.Map;
 5 //静态工厂方法,在bean里应用了facotry-method，spring就不会创建当前的对象了，只调用了一个工厂方法，没有实例化对象，也就是没有调用构造方法
 6 public class staticFactory {
 7     public staticFactory(){
 8         System.out.println(12);
 9     }
10     private static Map<String ,Car> cars=new HashMap<String , Car>();
11     static{
12         cars.put("audi", new Car("audi",30000));
13         cars.put("baoma", new Car("baoma",40000));
14     }
15     public static Car getcar(String name){
16         return cars.get(name);
17     }
18 
19 }

配置bean

1  <bean id="car1" class="com.wengde.spring.factory.staticFactory" factory-method="getcar">
2      <constructor-arg value="baoma"></constructor-arg>//这个是工厂方法getcar()的参数
3  </bean>

非静态工厂的配置

 1 package com.wengde.spring.factory;
 2 
 3 import java.util.HashMap;
 4 import java.util.Map;
 5 
 6 public class InstanceCar {
 7     private  Map<String,Car> cars=null;
 8     public InstanceCar(){
 9         System.out.println(2);
10         cars=new HashMap<String, Car>();
11         cars.put("audi", new Car("audi",300000));
12         cars.put("baoma", new Car("baoma",400000));
13         
14     }
15     public  Car getcar(String name){
16         return cars.get(name);
17     } 
21 }

由于是非静态的，所以必须要先有一个实例对象了才可以调用其方法

1   <!-- 配置工厂的实例 -->
2   <bean id="carfactory" class="com.wengde.spring.factory.InstanceCar" > </bean>
3      <!-- 通过实例方法来配置bean -->
4      <bean id="car2"  factory-bean="carfactory" factory-method="getcar">
5      <constructor-arg value="audi"></constructor-arg>//工厂方法的参数
6   </bean>

五基于注解的方式

扫描配置：自动扫描，多个包用逗号隔开,如果某个类的头上带有特定的注解[@Component/@Repository/@Service/@Controller]，就会将这个对象作为Bean注册进Spring容器。

<context:component-scan base-package="com.wengde.spring.annotation，com...."></context:component-scan>

1     <!--context： exclude-filter  排除指定资源 -->
2     <!--<context:component-scan base-package="com.wengde.spring.annotation">
3         <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Service"/>
4     </context:component-scan>-->

1     <!--  <context:include-filter，只包含指定资源，需要use-default-filters="false"取消默认的filter，只使用指定的资源 -->
2     <!-- <context:component-scan base-package="com.wengde.spring.annotation" use-default-filters="false">
3         <context:include-filter type="annotation" expression="org.springframework.stereotype.Service"/>
4     </context:component-scan>-->

1    <!--assignable 按照类来  -->
2    <!-- <context:component-scan base-package="com.wengde.spring.annotation" >
3         <context:exclude-filter type="assignable" expression="com.wengde.spring.annotation.repository.UseRepository"/>
4     </context:component-scan> -->

在类的头上带有这些注解@Component/@Repository/@Service/@Controller时，可以通过类名首字母小写的类名要获取IOC对象

 1 package com.wengde.spring.annotation.controller;
 2 import org.springframework.beans.factory.annotation.Autowired;
 3 import org.springframework.stereotype.Controller;
 4 import com.wengde.spring.annotation.service.UserService;
 5 @Controller
 6 public class UserController {
 7     private UserService userService;
 8     @Autowired
 9       public void setUserService(UserService userService) {
10         this.userService = userService;
11       }
12     public void execute(){
13         System.out.println("UserController execute");
14         userService.add();
15     }
16 }

获取bean对象

1 ApplicationContext api=new ClassPathXmlApplicationContext("beans-annotations.xml");
2 UserController  userController=(UserController) api.getBean("userController");类名的首字母小写
3 userController.execute();

类的属性自动生成实例对象，通过在属性顶部加上@Autowired(required=false)，require=false是取消自动生成实例对象

 1 package com.wengde.spring.annotation.repository;
 2 import org.springframework.beans.factory.annotation.Autowired;
 3 import org.springframework.stereotype.Repository;
 4 import com.wengde.spring.annotation.TestObject;
 5 @Repository
 6 public class UserRepositoryImpl implements UseRepository{
 7     @Autowired(required=false)
 8     private TestObject testObject;
 9     @Override
10     public void save() {
11         System.out.println("UserRepository Save...");
12         System.out.println(testObject);
13     }
14 
15 }

当一个接口有多个实现类的时候，为了指定是那个特定的实现类的对象，可以通过@Qualifier("userRepositoryImpl")注解来指定对应的实现类对象

 1 package com.wengde.spring.annotation.service;
 2 import org.springframework.beans.factory.annotation.Autowired;
 3 import org.springframework.beans.factory.annotation.Qualifier;
 4 import org.springframework.stereotype.Service;
 5 import com.wengde.spring.annotation.repository.UseRepository;
 6 import com.wengde.spring.annotation.repository.UserRepositoryImpl;
 7 @Service
 8 public class UserService {
 9     @Autowired
10     @Qualifier("userRepositoryImpl")
11     private UseRepository useRepository;
12    public void add(){
13        System.out.println("UserService add");
14        useRepository.save();
15    }
16 }

六 spring的AOP

动态代理

1 package com.wengde.spring.aop;
2 public interface ArithmeticCalculator {
3     int add(int i,int j);
4     int sub(int i,int j);
5     int div(int i,int j);
6 }

ArithmeticCalculator实现类

 1 package com.wengde.spring.aop;
 2 
 3 public class ArithmeticCalulatorImpl  implements ArithmeticCalculator{
 4 
 5     @Override
 6     public int add(int i, int j) {
 7         int reslut=i+j;
 8         return reslut;
 9     }
10 
11     @Override
12     public int sub(int i, int j) {
13         int reslut=i-j;
14         return reslut;
15     }
16 
17     @Override
18     public int div(int i, int j) {
19         int reslut=i/j;
20         return reslut;
21     }
22 
23 }

代理对象

 1 package com.wengde.spring.aop;
 2 import java.lang.reflect.InvocationHandler;
 3 import java.lang.reflect.Method;
 4 import java.lang.reflect.Proxy;
 5 import java.util.Arrays;
 6 public class ArithmeticalCalculatorLoggingProxy {
 7     //要代理的对象
 8     private ArithmeticCalculator target;
 9     //通过方法返回代理的对象
10     public ArithmeticalCalculatorLoggingProxy(ArithmeticCalculator target) {
11         super();
12         this.target = target;
13     }
14 
15     //
16     public ArithmeticCalculator getLoggingProxy(){
17     ArithmeticCalculator proxy=null;
18     //代理对象由哪一个类加载器负责加载
19     ClassLoader  loader=target.getClass().getClassLoader();
20     //代理对象的类型，及其中有哪些方法
21     Class[] interfaces=new Class[]{ArithmeticCalculator.class};
22     //当调用代理对象其中的方法时，该执行的代码
23     InvocationHandler h=new InvocationHandler() {
24     /*
25      * proxy；正在返回的那个代理对象，一般情况下，在invoke方法中都不使用该对象
26      * method：正在被调用的方法
27      * args：调用方法时传入的参数
28      * */    
29         @Override
30         public Object invoke(Object proxy, Method method, Object[] args)
31                 throws Throwable {
32             //System.out.println(proxy.toString());
33             String  methodName=method.getName();
34             //日志，前置通知
35             System.out.println("The  method" +methodName+" begin with["+Arrays.asList(args)+"]");
36             //执行方法
37             Object result=null;
38                     try {
39                         //返回通知
40                         result=method.invoke(target, args);
41                     } catch (Exception e) {
42                         // TODO Auto-generated catch block
43                         e.printStackTrace();
44                         //异常通知
45                     }
46             //后置通知
47             System.out.println("The  method" +methodName+" end with"+result);
48             return result;
49         }
50     };
51     proxy=(ArithmeticCalculator) Proxy.newProxyInstance(loader, interfaces, h);
52     return proxy;
53         
54     }
55 }

main方法

 1 package com.wengde.spring.aop;
 2 
 3 public class Main {
 4     public static void main(String[] args) {
 5         // ArithmeticCalculator arithmeticCalculator=new ArithmeticCalulatorImpl();
 6        ArithmeticCalculator target=new ArithmeticCalulatorImpl();
 7        ArithmeticCalculator proxy=new ArithmeticalCalculatorLoggingProxy(target).getLoggingProxy();
 8        System.out.println(proxy.getClass().getName());//代理
 9       int result= proxy.add(2, 3);
10       System.out.println(result);
11       int result1= proxy.sub(6, 2);
12       System.out.println(result1);    
14     }
16 }

Spring的AOP（基于注解），一些常用的术语

Aspect：切面

Advice：通知

Target：目标

Proxy：代理

Joinpoint:连接点

PointCut:切点

@Before：前置通知

@After：后置通知

@AfterReturning：返回通知

@AfterThrowing：异常通知

@Around：环绕通知

@Order：切面优先级，值越小，优先级越高

用代码要实现AOP

1 package com.wengde.spring.aop;
2 
3 public interface ArithmeticCalculator {
4     int add(int i,int j);
5     int sub(int i,int j);
6     int div(int i,int j);
7     void delete(int i,int j);
8 
9 }

 1 package com.wengde.spring.aop;
 2 
 3 import org.springframework.stereotype.Component;
 4 
 5 @Component
 6 public class ArithmeticCalulatorImpl  implements ArithmeticCalculator{
 7 
 8     @Override
 9     public int add(int i, int j) {
10         int reslut=i+j;
11         return reslut;
12     }
13 
14     @Override
15     public int sub(int i, int j) {
16         int reslut=i-j;
17         return reslut;
18     }
19 
20     @Override
21     public int div(int i, int j) {
22         int reslut=i/j;
23         return reslut;
24     }
25 
26     @Override
27     public void delete(int i, int j) {
28         System.out.println(i-j);
29         
30     }
31 
32 }

 1 package com.wengde.spring.aop;
 2 
 3 
 4 import java.util.Arrays;
 5 import java.util.List;
 6 
 7 import org.aspectj.lang.JoinPoint;
 8 import org.aspectj.lang.ProceedingJoinPoint;
 9 import org.aspectj.lang.annotation.After;
10 import org.aspectj.lang.annotation.AfterReturning;
11 import org.aspectj.lang.annotation.AfterThrowing;
12 import org.aspectj.lang.annotation.Around;
13 import org.aspectj.lang.annotation.Aspect;
14 import org.aspectj.lang.annotation.Before;
15 import org.aspectj.lang.annotation.Pointcut;
16 import org.springframework.core.annotation.Order;
17 import org.springframework.stereotype.Component;
18 
19 @Component
20 @Aspect
21 @Order(1)
22 public class LoggingAspect {
23     /*定义一个方法，用于声明切点表达式，一般地，该方法中不在需要添如其他的代码
24      * 使用@pointcut来声明切入点表达式
25      * 后面的其他通知直接使用方法名来引用当前的切入点表达式
26      * */
27     @Pointcut("execution(* com.wengde.spring.aop.ArithmeticCalculator.*(..))")// public int com.wengde.spring.aop.ArithmeticCalculator.add(int i, int j)
28     public void declareJoinPointException(){}
29     //前置通知，在ioc容器中找到与注解匹配的方法就执行
30     @Before("declareJoinPointException()")
31     public void beforeMeyhod(JoinPoint  joinpoint){
32         String methodName=joinpoint.getSignature().getName();
33 //        Object[] args=joinpoint.getArgs();
34 //        System.out.println("The  method "+methodName+" begin with"+Arrays.asList(args));
35         List<Object> args=Arrays.asList(joinpoint.getArgs());
36         System.out.println("The  method "+methodName+" begin with"+args);
37     }
38   //后置通知：在目标方法执行后执行(无论发生异常)
39     //在后置通知中不能访问目标方法执行结果
40     @After("declareJoinPointException()")
41     public void  afterMethod(JoinPoint  joinpoint){
42         String methodName=joinpoint.getSignature().getName();
43         System.out.println("The  method "+methodName+" ends");
44     }
45     //返回通知，在方法正常执行后的通知
46     @AfterReturning(value="declareJoinPointException()",returning="result")
47     public void  afterReturn(JoinPoint  joinpoint,Object result){
48         String methodName=joinpoint.getSignature().getName();
49         System.out.println("The  method "+methodName+" ends"+result);
50     }
51     //异常通知，在目标方法出现异常时会执行的代码，可以访问异常对象，切可以指定指定异常时在执行通知代码
52     @AfterThrowing(value="declareJoinPointException()",throwing="e")
53     //可以访问异常对象，切可以指定指定异常时在执行通知代码
54     //public void  afterThrowing(JoinPoint  joinpoint,NULLPointException e){}
55     public void  afterThrowing(JoinPoint  joinpoint,Exception e){
56         String methodName=joinpoint.getSignature().getName();
57         System.out.println("The  method "+methodName+" occurs"+e);
58     }
59     /*
60      * h环绕通知需要携带ProceedingJoinPoint类型的参数
61      * 环绕通知类似于动态代理的全过程，ProceedingJoinPoint类型的参数可以决定地否执行目标方法
62      * 且环绕通知必须有返回值，返回值即为目标方法的返回值
63      * 
64      * */
65 //    @Around("execution(* com.wengde.spring.aop.ArithmeticCalculator.*(int , int ))")
66 //    public Object  aroundMethod(ProceedingJoinPoint pjd){
67 //        Object result=null;
68 //        String methodName=pjd.getSignature().getName();
69 //    //执行目标方法
70 //        try {
71 //            //前置通知
72 //            System.out.println("The method"+methodName+"begin  with"+Arrays.asList(pjd.getArgs()));
73 //            result= pjd.proceed();
74 //            //返回通知(方法正常执行后的通知)
75 //            
76 //            System.out.println("The method"+methodName+"end"+result);
77 //        } catch (Throwable e) {
78 //            //异常通知(方法出现异常出现的代码)
79 //            System.out.println("The  method"+methodName+"occurs exception"+e);
80 //             throw new  RuntimeException(e);
81 //        }
82 //        //后置通知
83 //        System.out.println("The method  ends ");
84 //        return result;//环绕通知一定需要的这个return代码
85 //    }
86 //    
87 }

 1 package com.wengde.spring.aop;
 2 
 3 import org.springframework.context.ApplicationContext;
 4 import org.springframework.context.support.ClassPathXmlApplicationContext;
 5 
 6 public class Main {
 7     public static void main(String[] args) {
 8         ApplicationContext  api=new ClassPathXmlApplicationContext("application.xml");
 9         ArithmeticCalculator arithmeticCalculator=(ArithmeticCalculator) api.getBean(ArithmeticCalculator.class);
10         System.out.println(arithmeticCalculator.getClass().getName());
11         int result=arithmeticCalculator.add(3, 55);
12         System.out.println(result);
13           result=arithmeticCalculator.div(6, 2);
14         System.out.println(result);
15         //arithmeticCalculator.delete(4, 2);//没有返回值就是null
16         
17     }
18 
19 }

配置applicationContext

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xmlns:context="http://www.springframework.org/schema/context"
 5     xmlns:aop="http://www.springframework.org/schema/aop"
 6     xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
 7         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
 8         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
 9 
10     <context:component-scan base-package="com.wengde.spring.aop"></context:component-scan>
11     <!-- 使Aspectj注解起作用，使注解的java类生成代理对象，例如 before -->
12     <aop:aspectj-autoproxy></aop:aspectj-autoproxy>
13 
14 </beans>

运行结果：

十月 06, 2018 11:16:00 下午 org.springframework.context.support.ClassPathXmlApplicationContext prepareRefresh
信息: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@df0c3a: startup date [Sat Oct 06 23:16:00 CST 2018]; root of context hierarchy
十月 06, 2018 11:16:00 下午 org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
信息: Loading XML bean definitions from class path resource [application.xml]
十月 06, 2018 11:16:00 下午 org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor <init>
信息: JSR-330 'javax.inject.Inject' annotation found and supported for autowiring
com.sun.proxy.$Proxy13
The  method add begin with[3, 55]
-----[3, 55]
The  method add ends
The  method add ends58
58
The  method div begin with[6, 2]
-----[6, 2]
The  method div ends
The  method div ends3
3

基于XML的方式

 1 package com.wengde.spring.aop.xml;
 2 import java.util.Arrays;
 3 import java.util.List;
 4 import org.aspectj.lang.JoinPoint;
 5 import org.aspectj.lang.ProceedingJoinPoint;
 6 import org.aspectj.lang.annotation.After;
 7 import org.aspectj.lang.annotation.AfterReturning;
 8 import org.aspectj.lang.annotation.AfterThrowing;
 9 import org.aspectj.lang.annotation.Around;
10 import org.aspectj.lang.annotation.Aspect;
11 import org.aspectj.lang.annotation.Before;
12 import org.aspectj.lang.annotation.Pointcut;
13 import org.springframework.core.annotation.Order;
14 import org.springframework.stereotype.Component;
15 
16 public class LoggingAspect {
17     public void beforeMethod(JoinPoint  joinpoint){
18         String methodName=joinpoint.getSignature().getName();
19 //        Object[] args=joinpoint.getArgs();
20 //        System.out.println("The  method "+methodName+" begin with"+Arrays.asList(args));
21         List<Object> args=Arrays.asList(joinpoint.getArgs());
22         System.out.println("The  method "+methodName+" begin with"+args);
23     }
24     public void  afterMethod(JoinPoint  joinpoint){
25         String methodName=joinpoint.getSignature().getName();
26         System.out.println("The  method "+methodName+" ends");
27     }
28     public void  afterReturn(JoinPoint  joinpoint,Object result){
29         String methodName=joinpoint.getSignature().getName();
30         System.out.println("The  method "+methodName+" ends"+result);
31     }
32 
33     public void  afterThrowing(JoinPoint  joinpoint,Exception e){
34         String methodName=joinpoint.getSignature().getName();
35         System.out.println("The  method "+methodName+" occurs"+e);
36     }
37 
38 //    public Object  aroundMethod(ProceedingJoinPoint pjd){
39 //        Object result=null;
40 //        String methodName=pjd.getSignature().getName();
41 //    //执行目标方法
42 //        try {
43 //            //前置通知
44 //            System.out.println("The method"+methodName+"begin  with"+Arrays.asList(pjd.getArgs()));
45 //            result= pjd.proceed();
46 //            //返回通知(方法正常执行后的通知)
47 //            
48 //            System.out.println("The method"+methodName+"end"+result);
49 //        } catch (Throwable e) {
50 //            //异常通知(方法出现异常出现的代码)
51 //            System.out.println("The  method"+methodName+"occurs exception"+e);
52 //             throw new  RuntimeException(e);
53 //        }
54 //        //后置通知
55 //        System.out.println("The method  ends ");
56 //        return result;//环绕通知一定需要的这个return代码
57 //    }
58 //    
59 }

配置applicationContext

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xmlns:context="http://www.springframework.org/schema/context"
 5     xmlns:aop="http://www.springframework.org/schema/aop"
 6     xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
 7         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
 8         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
 9 
10     <bean id="arithmeticCalculator" class="com.wengde.spring.aop.xml.ArithmeticCalulatorImpl"></bean>
11     <!-- 配置切面的bean -->
12     <bean id="loggingAspect" class="com.wengde.spring.aop.xml.LoggingAspect"></bean>
13     <bean id="vlidation" class="com.wengde.spring.aop.xml.Vlidation"></bean>
14     <!-- 配置aop配置 -->
15     <aop:config>
16         <!-- 配置切点表达式 -->
17         <aop:pointcut expression="execution(*  com.wengde.spring.aop.xml.ArithmeticCalculator.*(int , int))" id="pointcut"/>
18         <!-- 配置切面以及通知 -->
19         <aop:aspect ref="loggingAspect" order="2">
20            <aop:before method="beforeMethod" pointcut-ref="pointcut"/>
21            <aop:after-returning method="afterReturn" pointcut-ref="pointcut" returning="result"/>
22            <aop:after method="afterMethod" pointcut-ref="pointcut"/>
23            <aop:after-throwing method="afterThrowing" pointcut-ref="pointcut" throwing="e"/>
24         </aop:aspect>
25         <aop:aspect ref="vlidation" order="1">
26           <aop:before method="vlidation" pointcut-ref="pointcut"/>
27         </aop:aspect>
28     </aop:config>
29 </beans>

JdbcTemplate查询数据库以及事务

配置

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xmlns:context="http://www.springframework.org/schema/context"
 5     xmlns:aop="http://www.springframework.org/schema/aop"
 6     xmlns:tx="http://www.springframework.org/schema/tx"
 7     xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
 8         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
 9         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
10         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
11  <context:component-scan base-package="com.wengde.spring"></context:component-scan>
12  
13  <!-- 导入资源文件 -->
14   <context:property-placeholder location="classpath:db.properties"/>
15   <!-- 配置 C3p0数据源-->
16   <bean id="dataSourse" class="com.mchange.v2.c3p0.ComboPooledDataSource">
17      <property name="user" value="${user}"></property>
18      <property name="password" value="${password}"></property>
19      <property name="driverClass" value="${driverClass}"></property>
20      <property name="jdbcUrl" value="${url}"></property>
21      <property name="initialPoolSize" value="${initPoolSize}"></property>
22      <property name="maxPoolSize" value="${maxPoolSize}"></property>
23   </bean>
24     <!-- 配置spring的jdbc -->
25     <bean  id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
26       <property name="dataSource" ref="dataSourse"></property>
27     </bean>
28     <!-- 配置事务管理器 -->
29     <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
30      <property name="dataSource" ref="dataSourse"></property>
31     
32     </bean>
33     <!-- 启动事务管理器 -->
34     <tx:annotation-driven transaction-manager="transactionManager"/>
35 </beans>

test类

 1 package com.wengde.spring.jdbc;
 2 
 3 import static org.junit.Assert.*;
 4 
 5 import java.sql.SQLException;
 6 import java.util.ArrayList;
 7 import java.util.List;
 8 
 9 import javax.sql.DataSource;
10 
11 import org.junit.Test;
12 import org.springframework.context.ApplicationContext;
13 import org.springframework.context.support.ClassPathXmlApplicationContext;
14 import org.springframework.jdbc.core.BeanPropertyRowMapper;
15 import org.springframework.jdbc.core.JdbcTemplate;
16 import org.springframework.jdbc.core.RowMapper;
17 
18 
19 public class JDBCtest {
20    private ApplicationContext api=null;
21    private JdbcTemplate jdbcTemplate;
22    {
23        api=new ClassPathXmlApplicationContext("applicationContext.xml");
24        jdbcTemplate=(JdbcTemplate) api.getBean("jdbcTemplate");
25        
26    }
27     @Test
28     public void testDataSourse() throws SQLException {
29         DataSource dataSource=(DataSource) api.getBean("dataSourse");
30         System.out.println(dataSource.getConnection());
31     }
32     /*执行insert,update,delete 
33      * 
34      * 
35      */
36     @Test
37     public void testUpdate(){
38         String sql="update mybooks set Title=? where id=?";
39         jdbcTemplate.update(sql, "java",1);
40     }
41     /*执行批量更新，批量insert，批量update，批量delete
42      * 
43      * */
44     @Test
45   public void testBathUpdate(){
46       String  sql="insert into mybooks(author,title,price,Publishingdate,Salesamount,Storenumber,Remark) values(?,?,?,?,?,?,?)";
47       List<Object[]> batchArgs=new ArrayList<Object[]>();
48       batchArgs.add(new Object[]{"zhang","AA","120","2018-10-5","55","66","加油"});
49       batchArgs.add(new Object[]{"li","BB","130","2018-10-4","77","88","努力"});
50       jdbcTemplate.batchUpdate(sql, batchArgs);
51       
52   }
53      /* 获取一个对象
54       * 注意不是调用queryForObject(String sql, Class<Book> requiredType, Object... args) 方法,该方法是获取某一个字段的值
55       * 而需要调用queryForObject(String sql, RowMapper<Book> rowMapper, Object... args) 
56       * 1.其中的rowMapper指定如何去映射结果集的行，常用的实现类是BeanPropertyRowMapper
57       * 
58       * */ 
59     @Test
60   public void testQueryObject(){
61       String  sql ="select * from mybooks where id=?";
62     // Book  book= jdbcTemplate.queryForObject(sql, Book.class, 1);
63       RowMapper<Book> rowMapper=new BeanPropertyRowMapper<Book>(Book.class);
64       Book book=jdbcTemplate.queryForObject(sql, rowMapper, 1);
65      System.out.println(book);
66   
67       }
68     /*查询实体类的集合
69      * 注意  调用的不是queryForlist()方法
70      * 
71      * 
72      * */
73     @Test
74     public void testQueryForlist(){
75         String  sql ="select * from mybooks where id<?";
76          RowMapper<Book> rowMapper=new BeanPropertyRowMapper<Book>(Book.class);
77         List<Book> books=jdbcTemplate.query(sql, rowMapper,5);
78         System.out.println(books);
79         
80     }
81     /*
82      * 查询单列的值或者统计查询
83      * queryForObject(String sql, Class<Long> requiredType)
84      * */
85     @Test
86     public void testQueryForObject(){
87         String sql="select count(id) from mybooks";
88         long count=jdbcTemplate.queryForObject(sql, Long.class);
89         System.out.println(count);
90     }
91 }

基于xml文件的事务配置

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xmlns:context="http://www.springframework.org/schema/context"
 5     xmlns:aop="http://www.springframework.org/schema/aop"
 6     xmlns:tx="http://www.springframework.org/schema/tx"
 7     xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
 8         http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
 9         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
10         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">
11 
12  
13  <!-- 导入资源文件 -->
14   <context:property-placeholder location="classpath:db.properties"/>
15   <!-- 配置 C3p0数据源-->
16   <bean id="dataSourse" class="com.mchange.v2.c3p0.ComboPooledDataSource">
17      <property name="user" value="${user}"></property>
18      <property name="password" value="${password}"></property>
19      <property name="driverClass" value="${driverClass}"></property>
20      <property name="jdbcUrl" value="${url}"></property>
21      <property name="initialPoolSize" value="${initPoolSize}"></property>
22      <property name="maxPoolSize" value="${maxPoolSize}"></property>
23   </bean>
24   <!-- 配置Spring的Jdbctemplate -->
25   <bean  id="jdbcTemplate"  class="org.springframework.jdbc.core.JdbcTemplate">
26      <property name="dataSource" ref="dataSourse"></property>
27   </bean>
28   <!-- 配置bean -->
29    <bean id="bookStockDao" class="com.wengde.spring.tx.xml.BookStockDaoImpl">
30     <property name="jdbcTemplate" ref="jdbcTemplate"></property>
31    </bean>
32     <bean id="bookShopServic" class="com.wengde.spring.tx.xml.service.impl.BookShopServiceImpl">
33      <property name="bookShopDao" ref="bookStockDao"></property>
34      </bean>
35      <bean id="cashier" class="com.wengde.spring.tx.xml.service.impl.CashierImpl">
36       <property name="bookShopService" ref="bookShopServic"></property>
37      </bean>
38      
39      <!-- 配置事务管理器 -->
40      <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
41        <property name="dataSource" ref="dataSourse"></property>
42      </bean>
43      <!-- 配置事务属性 -->
44      <tx:advice id="txadvice" transaction-manager="transactionManager">
45         <tx:attributes>
46           <!-- 根据方法名指定事务的属性 -->
47           <tx:method name="purchase" propagation="REQUIRES_NEW"/>
48           <tx:method name="*"/>
49         </tx:attributes>
50      </tx:advice>
51      <!-- 配置事务切入点，以及把事务切入点和事务属性关联起来 -->
52      <aop:config>
53        <aop:pointcut expression="execution(* com.wengde.spring.tx.xml.service.*.*(..) )" id="txPointCut"/>
54        <aop:advisor advice-ref="txadvice" pointcut-ref="txPointCut"/>
55      </aop:config>
56 </beans>

posted on 2018-10-06 23:32 掠过的岁月阅读(265) 评论(0) 编辑收藏举报

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