1. service 代码
package com.example.server1;
import org.springframework.stereotype.Service;
import com.netflix.hystrix.HystrixCommandGroupKey;
import com.netflix.hystrix.HystrixCommandKey;
import com.netflix.hystrix.HystrixThreadPoolKey;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.netflix.hystrix.HystrixCommand.Setter;
@Service
public class annotationHelloWorld {
private final String name;
public annotationHelloWorld() {
this.name = "Worlk";
}
@HystrixCommand(fallbackMethod="getFallback",commandKey="getUserById",groupKey="UserGroup",
threadPoolKey="getUserByIdThread")
protected String getUserById() throws Exception {
int i=1/0;
return "Hello " + name + "!";
}
protected String getFallback(Throwable e) {
System.out.println(e.getMessage());
e.printStackTrace();
return "faild";
}
}
2. Controller 代码
package com.example.server1;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class annotationHelloWorldController {
@Autowired
annotationHelloWorld ahw ;
@RequestMapping(value="/annotationhello",method=RequestMethod.GET)
public String commandhello () throws Exception {
return ahw.getUserById();
}
}
3. 浏览器访问获得降级处理的结果
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4. 控制台日志输出
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5. 修改 service 中 @HystrixCommand 注解忽悠 ArithmeticException 异常。忽略ArithmeticException 异常后,异常将会抛给页面。
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上面标红线的代码是忽略指定异常。
6. 浏览器访问结果
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7.控制台日志输出
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原文链接:https://blog.csdn.net/lixiaxin200319/article/details/81096737
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