业务背景：在当前项目下，所有前端请求均通过外层网关转发到后端这边的dubbo服务，现计划去掉网关层，由前端直接http调用后端dubbo。
解决方案：在前端调用方式不变的前提下，后端服务新建controller层（原后端服务无任何controller），做统一请求兼容转发
package cn.***********.controller;import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.dubbo.config.ApplicationConfig;
import org.apache.dubbo.config.ReferenceConfig;
import org.apache.dubbo.config.RegistryConfig;
import org.apache.dubbo.config.utils.ReferenceConfigCache;
import org.apache.dubbo.rpc.service.GenericService;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.lang.reflect.Method;
import java.lang.reflect.Parameter;
import java.util.List;
import java.util.Map;/*** Dubbo调用controller* @Version：1.0* @Desc*/
@Slf4j
@RestController
@RequestMapping("/api/test/")
public class GenericController {@PostMapping("/{service}/{method}")public Object invoke(HttpServletRequest request,@PathVariable("service") String service,@PathVariable("method") String method) {Object result;try {GenericService tarService = this.getTargetService(service);if(tarService == null){throw new RuntimeException("获取service失败");}// 1.解析传入参数String paramStr = this.parseInputStream(request);// 获取目标接口的 Class 对象Class<?> serviceInterface = Class.forName(service);// 获取方法的参数类型String[] parameterTypes = this.getMethodParameterTypes(serviceInterface, method);// 将 JSON 字符串转换为目标参数值Object[] parameters = this.convertParameters(paramStr, parameterTypes);// 调用方法result = tarService.$invoke(method, parameterTypes, parameters);} catch (Exception e) {log.error("服务调用失败, service={},method={}",service, method, e);throw new ErrorCodeException("000000", "系统异常，请稍后重试");}return result;}/*** 获取请求文本** @return*/public String parseInputStream(HttpServletRequest request) {try {ServletInputStream inputStream = request.getInputStream();StringBuilder content = new StringBuilder();int size = request.getContentLength();byte[] b = new byte[size];int lens;while ((lens = inputStream.read(b)) > 0) {content.append(new String(b, 0, lens, "utf-8"));}return content.toString();} catch (IOException e) {log.error("请求报文解析失败", e);throw new RuntimeException("请求报文解析异常");}}/*** 获取目标dubbo服务* @params [service]* @return org.apache.dubbo.rpc.service.GenericService* @desc*/private GenericService getTargetService(String service){// 应用信息ApplicationConfig application = SpringBeanUtils.getBean(ApplicationConfig.class);// 注册中心发现RegistryConfig registry = SpringBeanUtils.getBean(RegistryConfig.class);// 引用远程服务ReferenceConfig<GenericService> reference = new ReferenceConfig<>();reference.setApplication(application);reference.setRegistry(registry);reference.setProtocol("dubbo");reference.setInterface(service);reference.setTimeout(10000);reference.setRetries(0);// 声明为泛化接口reference.setGeneric(true);ReferenceConfigCache cache = ReferenceConfigCache.getCache();GenericService genericService = cache.get(reference);if(genericService == null){genericService = reference.get();}return genericService;}/*** 将 JSON 字符串转换为目标参数值* @params [paramStr, parameterTypes]* @return java.lang.Object[]* @author wu.zeng* @date 2025/2/21 13:44* @desc*/private Object[] convertParameters(String paramStr, String[] parameterTypes) {Object[] parameters = new Object[parameterTypes.length];for (int i = 0; i < parameterTypes.length; i++) {String paramType = parameterTypes[i];switch (paramType) {case "java.lang.String":parameters[i] = paramStr;break;case "java.lang.Integer":parameters[i] = Integer.parseInt(paramStr);break;case "java.lang.Long":parameters[i] = Long.parseLong(paramStr);break;case "java.util.Map":parameters[i] = JSON.parseObject(paramStr, new TypeReference<Map<String, Object>>() {});break;case "java.util.List":parameters[i] = JSON.parseObject(paramStr, new TypeReference<List<Object>>() {});break;default:// 如果是自定义类型，使用反射或 JSON 反序列化try {Class<?> clazz = Class.forName(paramType);parameters[i] = JSON.parseObject(paramStr, clazz);} catch (ClassNotFoundException e) {throw new RuntimeException("不支持的类型: " + paramType, e);}}}return parameters;}/** 获取目标方法的参数类型* @params [serviceInterface, methodName]* @return java.lang.String[]* @desc*/public String[] getMethodParameterTypes(Class<?> serviceInterface, String methodName) {for (Method method : serviceInterface.getMethods()) {// 由于不支持重载，因此这里可以根据 methodName 来匹配方法if (method.getName().equals(methodName)) {Parameter[] parameters = method.getParameters();String[] parameterTypes = new String[parameters.length];for (int i = 0; i < parameters.length; i++) {parameterTypes[i] = parameters[i].getType().getName();}return parameterTypes;}}throw new RuntimeException("方法未找到: " + methodName);}
}
)
