如何进行Spring MVC框架集成本地HTTP请求和Spring Cloud RPC请求

发布时间：2021-10-12 15:11:56 作者：柒染
来源：亿速云阅读：116

这期内容当中小编将会给大家带来有关如何进行Spring MVC框架集成本地HTTP请求和Spring Cloud RPC请求，文章内容丰富且以专业的角度为大家分析和叙述，阅读完这篇文章希望大家可以有所收获。

请求区分

请求路径，比如：uri加/rpc前缀用来标识RPC请求
请求头信息，比如：Accept:application/sc-rpc 用来标识RPC请求

输入参数和响应内容

方式一（旧）：

对Spring MVC的消息转换进行封装：

输入（@RequestBody）：重写com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter#read方法，对本地请求和RPC请求做兼容。

    @Override
    public Object read(Type type, Class<?> contextClass, HttpInputMessage inputMessage) throws IOException {
        try {
            // transform inputStream to string
            ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
            IOUtils.copy(inputMessage.getBody(), byteArrayOutputStream);
            String str = byteArrayOutputStream.toString(StandardCharsets.UTF_8.name());
            // parse json object
            JSONObject jsonObject = JSON.parseObject(str, super.getFastJsonConfig().getFeatures());

            // if RPC, transform the data format
            if (jsonObject.containsKey("data")) {
                return JSON.parseObject(jsonObject.getString("data"), type, super.getFastJsonConfig().getFeatures());
            }
            // otherwise, call super method
            return readType(super.getType(type, contextClass), new ByteArrayInputStream(byteArrayOutputStream.toByteArray()));
        } catch (JSONException ex) {
            throw new HttpMessageNotReadableException("JSON parse error: " + ex.getMessage(), ex);
        } catch (IOException ex) {
            throw new IOException("I/O error while reading input message", ex);
        }
    }

    private Object readType(Type type, InputStream in) {
        try {
            return JSON.parseObject(in,
                    super.getFastJsonConfig().getCharset(),
                    type,
                    super.getFastJsonConfig().getParserConfig(),
                    super.getFastJsonConfig().getParseProcess(),
                    JSON.DEFAULT_PARSER_FEATURE,
                    super.getFastJsonConfig().getFeatures());
        } catch (JSONException ex) {
            throw new HttpMessageNotReadableException("JSON parse error: " + ex.getMessage(), ex);
        } catch (IOException ex) {
            throw new HttpMessageNotReadableException("I/O error while reading input message", ex);
        }
    }

输出（@ResponseBody）：
重写com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter#writeInternal方法，本地请求和RPC请求的数据格式保持一致。

package com.caiya.web.base;

import com.alibaba.fastjson.JSONPObject;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import com.caiya.web.constant.CommonConstant;
import com.google.common.base.Joiner;
import org.springframework.http.HttpOutputMessage;
import org.springframework.http.converter.HttpMessageNotWritableException;

import java.io.IOException;

/**
 * fastjson消息转换器.
 */
public class ExtendedFastJsonHttpMessageConverter extends FastJsonHttpMessageConverter {

    @Override
    protected void writeInternal(Object object, HttpOutputMessage outputMessage) throws IOException, HttpMessageNotWritableException {
        super.writeInternal(wrapResult(object), outputMessage);
    }

    private Object wrapResult(Object object) {
        // 防止json请求重复包装
        if (object instanceof ResponseDataWrapper) {
            return object;
        }

        if (object instanceof JSONPObject) {
            JSONPObject jsonpObject = (JSONPObject) object;
            JSONPObject newJsonpObject = new JSONPObject(jsonpObject.getFunction());
            ResponseDataWrapper data;
            if (jsonpObject.getParameters().size() == 1) {
                // 防止jsonp请求重复包装
                if (jsonpObject.getParameters().get(0) instanceof ResponseDataWrapper) {
                    return object;
                }
                data = ResponseDataWrapperBuilder.build(jsonpObject.getParameters().get(0));
            } else if (jsonpObject.getParameters().size() > 1) {
                data = ResponseDataWrapperBuilder.build(Joiner.on(",").join(jsonpObject.getParameters()));
            } else {
                data = ResponseDataWrapperBuilder.build(CommonConstant.PLACEHOLDER_OBJECT_EMPTY);
            }
            newJsonpObject.addParameter(data);
            return newJsonpObject;
        }

        return ResponseDataWrapperBuilder.build(object);
    }

}

方式二：

输入：
不需要处理，RPC请求时指定Accept即可：

package com.caiya.test.spring.cloud.configuration;

import org.apache.http.HttpHost;
import org.apache.http.client.HttpClient;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.impl.client.DefaultConnectionKeepAliveStrategy;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.message.BasicHeader;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.Collections;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;

@Configuration
public class FeignConfig {
    @Bean
    public HttpClient httpClient() {
        System.out.println("init feign httpclient configuration 1111");
        // 生成默认请求配置
        RequestConfig.Builder requestConfigBuilder = RequestConfig.custom();
        // 超时时间
        requestConfigBuilder.setSocketTimeout(5 * 1000);
        // 连接时间
        requestConfigBuilder.setConnectTimeout(5 * 1000);

        // 设置代理
//        requestConfigBuilder.setProxy(new HttpHost("127.0.0.1", 8880));

        RequestConfig defaultRequestConfig = requestConfigBuilder.build();
        // 连接池配置
        // 长连接保持30秒
        final PoolingHttpClientConnectionManager pollingConnectionManager = new PoolingHttpClientConnectionManager(30, TimeUnit.MILLISECONDS);
        // 总连接数
        pollingConnectionManager.setMaxTotal(5000);
        // 同路由的并发数
        pollingConnectionManager.setDefaultMaxPerRoute(100);

        // httpclient 配置
        HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
        // 保持长连接配置，需要在头添加Keep-Alive
        httpClientBuilder.setKeepAliveStrategy(new DefaultConnectionKeepAliveStrategy());
        httpClientBuilder.setConnectionManager(pollingConnectionManager);
        httpClientBuilder.setDefaultRequestConfig(defaultRequestConfig);
        httpClientBuilder.setDefaultHeaders(Collections.singleton(new BasicHeader("Accept", "application/sc-rpc")));
        HttpClient client = httpClientBuilder.build();


        // 启动定时器，定时回收过期的连接
        /*Timer timer = new Timer();
        timer.schedule(new TimerTask() {
            @Override
            public void run() {
                //        System.out.println("=====closeIdleConnections===");
                pollingConnectionManager.closeExpiredConnections();
                pollingConnectionManager.closeIdleConnections(5, TimeUnit.SECONDS);
            }
        }, 10 * 1000, 5 * 1000);*/
        System.out.println("===== Apache httpclient 初始化连接池===");

        return client;
    }
}

输出：
根据mediaType区分消息转换。

package com.caiya.web.configuration;

import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import com.caiya.web.base.ExtendedFastJsonHttpMessageConverter;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;

import java.util.Arrays;
import java.util.Collections;

/**
 * fastjson消息转换器配置.
 *
 * @author caiya
 * @since 1.0
 */
@Configuration
public class FastJsonConfiguration {

    @Bean
    public HttpMessageConverters extendedFastJsonHttpMessageConverter() {
        // for web controller
        FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new ExtendedFastJsonHttpMessageConverter();
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        fastJsonConfig.setSerializerFeatures(SerializerFeature.DisableCircularReferenceDetect);
//      fastJsonConfig.setSerializerFeatures(SerializerFeature.WriteMapNullValue);
        fastJsonHttpMessageConverter.setFastJsonConfig(fastJsonConfig);
        fastJsonHttpMessageConverter.setSupportedMediaTypes(Arrays.asList(MediaType.APPLICATION_JSON, MediaType.APPLICATION_JSON_UTF8));
        // for web resource(Spring Cloud RPC)
        FastJsonHttpMessageConverter fastJsonHttpMessageConverterPlain = new FastJsonHttpMessageConverter();
        FastJsonConfig fastJsonConfigPlain = new FastJsonConfig();
        fastJsonConfigPlain.setSerializerFeatures(SerializerFeature.DisableCircularReferenceDetect);
//      fastJsonConfigPlain.setSerializerFeatures(SerializerFeature.WriteMapNullValue);
        fastJsonHttpMessageConverterPlain.setFastJsonConfig(fastJsonConfigPlain);
        fastJsonHttpMessageConverterPlain.setSupportedMediaTypes(Collections.singletonList(MediaType.valueOf("application/sc-rpc")));
        return new HttpMessageConverters(fastJsonHttpMessageConverter, fastJsonHttpMessageConverterPlain);
    }

}

方式三

在每个controller的method，返回最终响应内容。

方式四

通过aop处理不同的请求（RPC请求不处理即可）：

package com.caiya.web.base;

import com.alibaba.fastjson.JSONPObject;
import com.caiya.web.constant.CommonConstant;
import com.google.common.base.Joiner;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

/**
 * 对响应内容的包装处理AOP.
 */
@Component
@Aspect
public class ResponseDataWrapperAspect {

    @Pointcut("execution(* com.caiya.web.controller.rest..*(..))")
    public void aspect() {
    }

    @Around("aspect()")
    public Object around(ProceedingJoinPoint joinPoint) throws Throwable {
        Object object = joinPoint.proceed(joinPoint.getArgs());
        return wrapResult(object);
    }

    private Object wrapResult(Object object) {
        // 防止json请求重复包装
        if (object instanceof ResponseDataWrapper) {
            return object;
        }

        if (object instanceof JSONPObject) {
            JSONPObject jsonpObject = (JSONPObject) object;
            JSONPObject newJsonpObject = new JSONPObject(jsonpObject.getFunction());
            ResponseDataWrapper data;
            if (jsonpObject.getParameters().size() == 1) {
                // 防止jsonp请求重复包装
                if (jsonpObject.getParameters().get(0) instanceof ResponseDataWrapper) {
                    return object;
                }
                data = ResponseDataWrapperBuilder.build(jsonpObject.getParameters().get(0));
            } else if (jsonpObject.getParameters().size() > 1) {
                data = ResponseDataWrapperBuilder.build(Joiner.on(",").join(jsonpObject.getParameters()));
            } else {
                data = ResponseDataWrapperBuilder.build(CommonConstant.PLACEHOLDER_OBJECT_EMPTY);
            }
            newJsonpObject.addParameter(data);
            return newJsonpObject;
        }

        return ResponseDataWrapperBuilder.build(object);
    }

}

拦截器和过滤器

对RPC请求都不必拦截，放行处理（包括会话拦截器、权限拦截器、XSS过滤器等）

nginx

RPC请求只允许通过Spring Cloud注册中心、网关等调用[schema]://[ip]:[port]/[request_uri] 的形式，nginx 需要拦截路径包含 /rpc/ 目录的 RPC 接口调用（彻底隔离只需分离本地请求和RPC请求的应用即可）：

	location ~* /rpc/ {
            return 403;
        }

Spring Cloud 异常处理

服务端异常处理

推荐最外层包裹一层Result对象，表示接口执行结果，包含经过处理的异常信息

客户端异常处理

开启feignclient的hystrix熔断：

feign:
  hystrix:
    enabled: true

实现接口feign.codec.ErrorDecoder，处理服务端异常：

package com.caiya.web.configuration;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.netflix.hystrix.exception.HystrixBadRequestException;
import feign.Response;
import feign.Util;
import feign.codec.ErrorDecoder;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.cloud.openfeign.FeignClientsConfiguration;
import org.springframework.context.annotation.Configuration;

import java.io.IOException;

/**
 * Spring Cloud(feign with hystrix)自定义异常处理.
 *
 * @see FeignClientsConfiguration.HystrixFeignConfiguration#feignHystrixBuilder() 开启hystrix入口
 * @see HystrixBadRequestException 此异常类型不会进行熔断操作
 * HystrixBadRequestException.message:
 * {"path":"/rpc/session/user/info","error":"Internal Server Error","message":"Illegal Agument Exception..","timestamp":1540266379459,"status":500}
 */
@Configuration
public class FeignErrorDecoder implements ErrorDecoder {

    private static final Logger logger = LoggerFactory.getLogger(FeignErrorDecoder.class);

    @Override
    public Exception decode(String methodKey, Response response) {
        String message = null;
        if (response.status() >= 400 && response.status() <= 500) {
            try {
                if (response.body() != null) {
                    String body = Util.toString(response.body().asReader());
                    try {
                        JSONObject jsonObject = JSON.parseObject(body);
                        if (jsonObject.containsKey("data")) {
                            JSONObject content = jsonObject.getJSONObject("data");
                            if (StringUtils.isNotBlank(content.getString("message"))) {
                                message = content.getString("message");
                                if ("connect timed out".equals(message)) {
                                    return feign.FeignException.errorStatus(methodKey, response);
                                }
                            } else {
                                message = content.getString("error");
                            }
                        }
                        if (message == null) {
                            message = jsonObject.getString("message");
                        }
                    } catch (Exception e) {
                        logger.error(e.getMessage(), e);
                        message = body;
                    }
                }
            } catch (IOException e) {
                logger.error(e.getMessage(), e);
            }
            return new HystrixBadRequestException(message);
        }
        return feign.FeignException.errorStatus(methodKey, response);
    }
}

处理超时异常，实现@FeignClient注解中的属性fallback或fallbackFactory的相关类，进行熔断处理

其他补充

如何进行Spring MVC框架集成本地HTTP请求和Spring Cloud RPC请求

上述就是小编为大家分享的如何进行Spring MVC框架集成本地HTTP请求和Spring Cloud RPC请求了，如果刚好有类似的疑惑，不妨参照上述分析进行理解。如果想知道更多相关知识，欢迎关注亿速云行业资讯频道。

如何进行Spring MVC框架集成本地HTTP请求和Spring Cloud RPC请求

请求区分

输入参数和响应内容

拦截器和过滤器

nginx

Spring Cloud 异常处理

其他补充

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