如何将服务注入模块以进行数据提取

Question

嗨，我需要从路由模块访问某个组件中存在的某些数据。我正在尝试为参数设置默认值，但我不知道如何将服务注入路由模块中。

路由模块->

import { NgModule } from '@angular/core';
import {Routes,RouterModule} from '@angular/router'
import {SuperbarComponent} from './superbar/superbar.component'
import { FeedComponent } from './feed/feed.component';
import {DatashareService} from '../datashare.service'


const st1 :string = 'hello';   //this need to be fetched from service
const st2 :sting  = 'world';   //to set as default redrect 
const routes : Routes = [

  {path : ':su/:cat', component :  FeedComponent},
  {path : '', redirectTo : st1+''+st2, pathMatch : 'full'}
]


@NgModule({
  imports : [RouterModule.forRoot(routes),],
  exports: [RouterModule,]
})
export class AppRoutingModule { }

在这里，我需要使用该服务将str1，str2初始化为需要输入到url中的适当值。 我的小服务->

import { Injectable } from '@angular/core';

@Injectable({
  providedIn: 'root'
})
export class DatashareService {
  supercategory : string;
  category :string;

  constructor() { }
  getdata(su : string, cat :string){
    this.supercategory = su;
    this.category = cat;
  }
  setcategory(){
    return this.category;
  }
  setsupercategory(){
    return this.supercategory;
  }

}

还有我从中感染数据的地方

import { Component, OnInit, ViewChild } from '@angular/core';
import {Http} from '@angular/http';
import {MetadataService } from '../metadata.service';
import {Tag, CatJson} from '../meta-data-model';  
import {CatbarComponent} from '../catbar/catbar.component';
import {DatashareService} from '../datashare.service'
@Component({
  selector: 'app-superbar',
  templateUrl: './superbar.component.html',
  styleUrls: ['./superbar.component.css']
})
export class SuperbarComponent implements OnInit {

@ViewChild('child1')
private child1 : CatbarComponent
supermap = new Map(); 
isloggedin : boolean = true;
isloading : boolean = true;
supercategories : Tag [] = [];
allcategories : Tag[] = [];
categories : Tag[] = [];
tempCategories : Tag[] = [];
selectedsu : Tag;

  constructor(private meta : MetadataService,private urlset : DatashareService) {}
  //using meta data service to get supercategories
  ngOnInit() {
   this.meta.getmetadata().subscribe(response =>{
     //newCatJson requires an object type data
     //in earlier versions one needed to body.parse(), but since http returns an object
     //that no longer needs be done
     const data = new CatJson(response);
     this.supercategories =  data.superCat;
     this.selectedsu = this.supercategories[0];
     this.allcategories = data.allCat;
     this.createsupermap();
     this.categories = this.supermap.get(this.selectedsu);
     this.urlset.getdata(this.selectedsu.superCategory,this.supermap.get(this.selectedsu)[0]['category']); 
     this.isloading = false;  
    });

    }