[Java知识库]springcloud nacos注册中心 配置context-path导致 服务调用404的问题

解决方法：

服务注册yml中在元数据中添加context-path地址，服务调用的时候拼接上该地址。
服务controller

package com.demo.controller;

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

@RestController
@Slf4j
public class DeptController {
    @Value("${server.port}")
    private String serverPort;

    @GetMapping(value = "/echo/{string}")
    public String getPayment(@PathVariable String string) {
        return "Hello Nacos Discovery " + string;
    }
}

服务提供者yml

server:
  port: 8082
  servlet:
    context-path: /SpringCloudDemo
    session:
      timeout: 1800
  tomcat:
    uri-encoding: UTF-8
  compression:
    enabled: true
    #mime-types: application/javascript,text/css,application/json,application/xml,text/html,text/xml,text/plain
    min-response-size: 1024
spring:
  application:
    name: service-provider
  cloud:
    nacos:
      discovery:
        server-addr: http://localhost:8848
        metadata:
          context-path: ${server.servlet.context-path}

注册成功后nacos存储的信息

服务调用的controller

package com.demo.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

@RestController
public class TestController {

    // Ribbon 提供的负载均衡对象
    @Resource
    private LoadBalancerClient loadBalancerClient;

    @Resource
    private RestTemplate restTemplate;

//    @Autowired
//    public TestController(RestTemplate restTemplate) {this.restTemplate = restTemplate;}

    @RequestMapping(value = "/echo/{str}", method = RequestMethod.GET)
    public String echo(@PathVariable String str) {
        // 根据 Ribbon 提供的对象 + Nacos 的服务 id 获取服务实例
        ServiceInstance serviceInstance = loadBalancerClient.choose("service-provider");
        // 获取服务实例中的 ip
        String ip = serviceInstance.getHost();
        // 获取服务实例中的端口号
        int port = serviceInstance.getPort();
        String context_path = serviceInstance.getMetadata().get("context-path");
        // 使用 restTemplate 请求并获取结果
        String result = restTemplate.getForObject("http://" + ip + ":" + port + context_path+"/echo/" + str,String.class);
//        return restTemplate.getForObject("http://service-provider/echo/sss", String.class);
        return result;
    }
}