spring-retry的简单使用

添加Maven依赖：

<dependency>
　　<groupId>org.springframework.retry</groupId>
   <artifactId>spring-retry</artifactId>
   <version>1.1.0.RELEASE</version>
</dependency>

代码结构：

源码：

package Exception;

/**
 * Created by zhengbin06 on 2017/2/14.
 */
public class Clazz {
    private int i = 0;
    public Student getStudent() throws SException {
        if(++i != 3) {
            System.out.println(i);
            throw new SException();
        }
        return new Student();
    }
}

package Exception;

import org.springframework.retry.RetryCallback;
import org.springframework.retry.RetryContext;
import org.springframework.retry.policy.SimpleRetryPolicy;
import org.springframework.retry.support.RetryTemplate;
import java.util.HashMap;
import java.util.Map;

public class RetryUtil {
    
    public static <T> T requestThridtWithRetry(final SRequest<T> sRequest) throws Exception {
        // 重试模板
        RetryTemplate template = new RetryTemplate();
        
        // 何种异常将触发重试
        Map<Class<? extends Throwable>, Boolean> map = new HashMap<Class<? extends Throwable>, Boolean>();
        map.put(SException.class, true);
    
        // 重试次数
        int retryTimes = 3;
    
        // 定义重试规则
        SimpleRetryPolicy policy = new SimpleRetryPolicy(retryTimes, map);
        template.setRetryPolicy(policy);
        
        // 执行重试
        return template.execute(new RetryCallback<T, Exception>() {
            public T doWithRetry(RetryContext context) throws SException {
                return sRequest.request();
            }
        });
        
    }
}

package Exception;

/**
 * Created by zhengbin06 on 2017/2/14.
 */
public class SException extends Exception {
    public SException() {
        super("getStudenException");
    }
}

package Exception;

/**
 * Created by zhengbin06 on 2017/2/14.
 */
public interface SRequest<T> {
    public T request() throws SException;
}

package Exception;

/**
 * Created by zhengbin06 on 2017/2/14.
 */
public class Student {
    @Override
    public String toString() {
        return "I'am student";
    }
}

package Exception;

/**
 * Created by zhengbin06 on 2017/2/14.
 */
public class TestRetry {
    public static void main(String[] args) throws Exception {
        final Clazz finalS = new Clazz();
        Student student = null;
        try {
            student = RetryUtil.requestThridtWithRetry(new SRequest<Student>() {
                public Student request() throws SException {
                    return finalS.getStudent();
                }
            });
        } catch (Exception e) {
            e.printStackTrace();
        }
        System.out.println(student.toString());
    }
}

引出一些Java基础点：

一天一个Java基础——泛型

Java基础——异常处理