1.配置：在angular项目根目录下创建：proxy.config.json
proxy.config.json文件：

{
  "/":{
    "target":"http://127.0.0.1:8080"
  }
}

"/"：代表后台项目路径
"target":"http://127.0.0.1:8080"  指明访问地址

2.修改package.json 为

"scripts": {
    "ng": "ng","start": "ng serve  --proxy-config proxy.config.json","build": "ng build","test": "ng test","lint": "ng lint","e2e": "ng e2e"
  }

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用 ng serve --proxy-config proxy.config.json 启动angualr项目

3.后端springboot接口：

@RestController
@RequestMapping("/test")
public class TestController {
    @Autowired
    private UserService userService;

    @GetMapping("/getUsers")
    public String getUsers(){
        return "\"{\"aa\":\"11\"}\"";
    }
}

4.angular访问：

import { HttpClient } from '@angular/common/http';
// 用HttpClient
this.http.get('/test/getUsers').subscribe(data => {
  console.log(data);
});

自己测试通过；