spring拦截器实现demo

绝地灬酷狼 2022-06-09 11:59 128阅读 0赞

spring拦截器及spring aop类似实现demo：  
public interface Interceptor \{

String intercept(ActionInvocation invocation);

public class TranscationInterceptor implements Interceptor \{

@Override
    public String intercept(ActionInvocation invocation) {
    
        System.out.println("I'm transcationInterceptor Before");
    
        String result = invocation.invoke();
    
        System.out.println("I'm transcationInterceptor after");
    
        return result;
    }

public class ParameterInterceptor implements Interceptor \{

@Override
    public String intercept(ActionInvocation invocation) {
    
        System.out.println("I'm parameterInterceptor Before");
    
        String result = invocation.invoke();
    
        System.out.println("I'm parameterInterceptor after");
    
        return result;
    }

public class ActionInvocation \{

private Iterator<Interceptor> interceptors;
    
    
    public String invoke(){
    
        String result = "default";
        if( interceptors.hasNext() ){
            Interceptor interceptor = interceptors.next();
            result = interceptor.intercept(ActionInvocation.this);
        }else{
            result = invokeActionOnly();
        }
    
    
        return result;
    }
    
    public String invokeActionOnly(){
        System.out.println("I'm action!");
        return "action";
    }
    
    public void setInterceptors(Iterator<Interceptor> interceptors) {
        this.interceptors = interceptors;
    }

public class TestMain \{

public static void main(String[] args) {
        List<Interceptor> interceptors = new ArrayList<Interceptor>(); 
        Interceptor parameterInterceptor = new ParameterInterceptor();
        Interceptor transcationInterceptor = new TranscationInterceptor();
        interceptors.add(transcationInterceptor);
        interceptors.add(parameterInterceptor);
    
    
        ActionInvocation actionInvocation = new ActionInvocation();
        actionInvocation.setInterceptors(interceptors.iterator());
    
        String result = actionInvocation.invoke();
        System.out.println(result);
    
    }