来源已被 CORS 政策 Spring boot 和 React 阻止 [英] origin has been blocked by CORS policy Spring boot and React

问题描述

这是一个返回所有区对象的控制器

在 'http://localhost:8080/ 处访问 XMLHttpRequest 来自 origin 'http://localhost:3000' 已被 CORS 策略阻止:请求的资源上不存在Access-Control-Allow-Origin"标头.

Access to XMLHttpRequest at 'http://localhost:8080/ from origin 'http://localhost:3000' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

package com.ministry.demo.controller;

import com.ministry.demo.model.District;
import com.ministry.demo.repository.DistrictRepository;
import com.ministry.demo.service.DistrictService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
@RequestMapping(path = "district")
public class DistrictController {
    @Autowired
    DistrictService service;

    @GetMapping(path = "getAll")
    List<District> getAllDistrict(){
        return service.getAllDistricts();
    }
}

推荐答案

我找到了答案

package com.ministry.demo.controller;

import java.util.List;

@RestController
@CrossOrigin
@RequestMapping(path = "district")
public class DistrictController {
    @Autowired
    DistrictService service;

    @GetMapping(path = "getAll")
    List<District> getAllDistrict(){
        return service.getAllDistricts();
    }
}

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