Angular 6:无法发出http请求 [英] Angular 6: unable to make http request

问题描述

在我的有角度的应用程序中，我试图向spring restful API发出http发布请求..但是我无法成功..在浏览器控制台中没有收到任何错误响应..

In my angular application, I am trying to make the http post request to the spring restful API.. but I could not succeed.. I am not getting any error response in the browser console..

我的角度代码是

addToCart(productId: number, quantity: number) {
    const headers = new HttpHeaders().set('Content-Type', 'text/plain; charset=utf-8');
    console.log("--------order.service.ts----------addToCart()-------productId:"+productId+":------quantity:"+quantity);
     this.http.post('http://localhost:8080/order/addtocart', 
              '{ "dealerId": 9, "createdBy": "-1", "productId": productId, "quantity": quantity}', 
              {headers: headers})
              .pipe(catchError(this.errorHandlerService.handleError));
    }

Spring restful API:

Spring restful API:

package com.wocs.rest.controller;

import java.io.IOException;
import java.util.Map;

import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.wocs.services.common.ServiceException;
import com.wocs.services.order.iface.OrderServiceIface;
import com.wocs.services.userrole.model.User;

@RestController()
@RequestMapping("/order")
public class OrderController {

    static Logger logger = Logger.getLogger(OrderController.class);

    @Autowired
    private OrderServiceIface orderService;

    public void setOrderService(OrderServiceIface orderService) {
        this.orderService = orderService;
    }

    @RequestMapping(value = "/addtocart", method = RequestMethod.POST, consumes = "text/plain")
    public void addToCart(@RequestBody String stringRequestBody) throws JsonParseException, JsonMappingException, IOException, ServiceException
    {
        logger.info("addtocart:"+stringRequestBody);
        Map<String, Object> jsonMap = new ObjectMapper().readValue(stringRequestBody,
            new TypeReference<Map<String,Object>>(){});

         orderService.addToCart((Integer)jsonMap.get("dealerId"), (String) jsonMap.get("createdBy"), (Integer)jsonMap.get("productId"), (Integer)jsonMap.get("quantity"));
    }

}

浏览器控制台:

任何帮助将不胜感激..预先感谢..

Any help would be appreciated.. Thanks in advance..

推荐答案

您错过了订阅.如果您在服务中声明了addToCart并想在组件中处理API响应，则将代码修改为:

You missed the subscription. If you have declared addToCart in service and want to handle API response in component modify code as:

服务

addToCart(productId: number, quantity: number) {
    let data = { 
        "dealerId": 9, 
        "createdBy": "-1", 
        "productId": productId, 
        "quantity": quantity
    }
    const headers = new HttpHeaders().set('Content-Type', 'text/plain; charset=utf-8');
    console.log("--------order.service.ts----------addToCart()-------productId:"+productId+":------quantity:"+quantity);
    return this.http.post('http://localhost:8080/order/addtocart', 
              JSON.stringify(data), 
              {headers: headers})
              .pipe(catchError(this.errorHandlerService.handleError));
}

组件 订阅服务方法

this.service.addToCart(2, 4).subscribe(res => {
    console.log(res); // Response from API
})

这篇关于Angular 6:无法发出http请求的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！