java 跨域设置_Java后端如何配置跨域

在springboot项目中如何设置跨域，其实很简单，只需要在Java项目中加一个配置类即可

可以用这种配置类

import org.springframework.beans.factory.annotation.Value;

import org.springframework.context.annotation.Configuration;

import org.springframework.web.servlet.config.annotation.CorsRegistry;

import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration

public class WebConfig implements WebMvcConfigurer {

@Value("${url}")

private String url;

@Override

public void addCorsMappings(CorsRegistry registry) {

registry.addMapping("/**")//设置允许跨域的路径

//如果有多个路径需要跨域，只需要将跨域路径放入数组中

//String [] allowDomain={"http://**","http://*","http://*"};

//.allowedOrigins(allowDomain)//多url跨域

.allowedOrigins(url)//设置允许跨域请求的域名

.allowCredentials(true)//是否允许证书 不写默认开启

.allowedMethods("GET","POST","PUT","OPTIONS","DELETE","PATCH") //设置允许的方法

.maxAge(3600);//跨域允许时间

}

}

也可以用这种

import lombok.extern.slf4j.Slf4j;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import org.springframework.web.cors.CorsConfiguration;

import org.springframework.web.cors.UrlBasedCorsConfigurationSource;

import org.springframework.web.filter.CorsFilter;

import java.util.Arrays;

/**

* 跨域配置类

*/

@Configuration

@Slf4j

public class GlobalCorsConfig {

String[] allowDomain = {"http://localhost:9527","http://localhost:7000"};//运行跨域的路径

@Bean

public CorsFilter corsFilter() {

log.info(Arrays.toString(this.allowDomain));

//1.添加CORS配置信息

CorsConfiguration config = new CorsConfiguration();

//1) 允许的域,不要写*，否则cookie就无法使用了

// config.addAllowedOrigin("http://localhost:9527"); //单路径

config.setAllowedOrigins(Arrays.asList(allowDomain)); //多路径

//2) 是否发送Cookie信息

config.setAllowCredentials(true);

//3) 允许的请求方式

config.addAllowedMethod("OPTIONS");

config.addAllowedMethod("HEAD");

config.addAllowedMethod("GET");

config.addAllowedMethod("PUT");

config.addAllowedMethod("POST");

config.addAllowedMethod("DELETE");

config.addAllowedMethod("PATCH");

// 4)允许的头信息

config.addAllowedHeader("*");

//2.添加映射路径，我们拦截一切请求

UrlBasedCorsConfigurationSource configSource = new UrlBasedCorsConfigurationSource();

configSource.registerCorsConfiguration("/**", config);

//3.返回新的CorsFilter.

return new CorsFilter(configSource);

}

}

二选一