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();
     }
 }

Clazz.java

 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();
             }
         });

     }
 }

RetryUtil.java

 package Exception;

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

SException.java

 package Exception;

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

SRequest.java

 package Exception;

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

Student.java

 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());
     }
 }

TestRetry.java

引出一些Java基础点：

一天一个Java基础——泛型

Java基础——异常处理