来源已被 CORS 策略 Spring 引导和 React 阻止

Question

Spring 使用 React 启动

在“http://localhost:8080/' from origin 'http://localhost:3000”访问 XMLHttpRequest 已被 CORS 策略阻止：

这是一个控制器，return所有分区对象

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();
    }
}

Answer 1

如果您的后端和您的应用程序不在运行同一地址上，您的浏览器通常不允许您调用您的后端。这是一项安全功能。

要允许您的浏览器调用您的 api，请将 Access-Control-**** header 添加到您的后端响应（从 Spring 回答时）。

见https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Origin

允许所有来源的最基本header：

Access-Control-Allow-Origin: *

这是在 Spring 中添加那些 header 的教程：https://spring.io/guides/gs/rest-service-cors/

Answer 2

MyConfiguration.java

@Configuration
public class MyConfiguration implements WebMvcConfigurer {

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedMethods("*");
    }

}

Answer 3

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();
    }
}

Answer 4

找到适合我的备选答案。

@Configuration
@EnableWebSecurity(debug = true)
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.csrf().disable()
                .authorizeRequests()
                .anyRequest().permitAll()
                .and().httpBasic();
    }

    @Bean
    public FilterRegistrationBean corsFilter() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        CorsConfiguration config = new CorsConfiguration();
        config.addAllowedOrigin("*");
        config.addAllowedHeader("*");
        config.addAllowedMethod("*");
        source.registerCorsConfiguration("/**", config);
        FilterRegistrationBean bean = new FilterRegistrationBean(new CorsFilter(source));
        bean.setOrder(0);
        return bean;
    }
}

来源已被 CORS 策略 Spring 引导和 React 阻止

origin has been blocked by CORS policy Spring boot and React

controller

reactjs

spring-boot

cors-anywhere

Spring 使用 React 启动

在“http://localhost:8080/' from origin 'http://localhost:3000”访问 XMLHttpRequest 已被 CORS 策略阻止：