sentinel web接口异常处理

1、创建类异常处理类，实现BlockExceptionHandler

exception.MyBlockExceptionHandler

2、使用 @Component 注入

3、在model模块创建返回结果类

common.R

package com.wt.common;

import lombok.Data;

@Data
public class R {
    private Integer code;
    private String msg;
    private Object data;

    public static R ok(){
        R r = new R();
        r.setCode(200);
        return r;
    }

    public static  R ok(Integer code, String msg){
        R r = new R();
        r.setCode(code);
        r.setMsg(msg);
        return r;
    }

    public static R error(){
        R r = new R();
        r.setCode(500);
        return r;
    }

    public static R error(Integer code, String msg){
        R r = new R();
        r.setCode(code);
        r.setMsg(msg);
        return r;
    }
}

4、实现重写的方法

package com.wt.order.exception;

import com.alibaba.csp.sentinel.adapter.spring.webmvc_v6x.callback.BlockExceptionHandler;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.wt.common.R;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Component;

import java.io.PrintWriter;

@Component
public class MyBlockExceptionHandler implements BlockExceptionHandler {
    private ObjectMapper objectMapper = new ObjectMapper();
    @Override
    public void handle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, String s, BlockException e) throws Exception {
        // 设置 utf-8
        httpServletResponse.setContentType("application/json;charset=utf-8");
        PrintWriter writer = httpServletResponse.getWriter();
        // 设置返回值
        R error = R.error(500, s + "被限制了" + e.getClass());
        String json = objectMapper.writeValueAsString(error);
        writer.write(json);
        writer.flush();
        writer.close();
    }
}

5、异常可以通过流控认为制造