SpringBoot--跨域--解决方案

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简介

        本文介绍SpringBoot如何处理跨域问题。

方案1：实现WebMvcConfigurer接口

package com.example.demo.common.config;

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 CorsConfig implements WebMvcConfigurer {
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                // .allowedOrigins("*") // SpringBoot2.4.0之前的版本
                .allowedOriginPatterns("*") // SpringBoot2.4.0及之后的版本
                .allowedMethods("GET", "HEAD", "POST", "PUT", "DELETE", "OPTIONS")
                .allowCredentials(true)
                .maxAge(3600)
                .allowedHeaders("*");
    }
}

方案2：过滤器

就是在response中写入这些响应头。

import org.springframework.context.annotation.Configuration;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebFilter(filterName = "CorsFilter ")
@Configuration
public class CorsFilter implements Filter {
    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) 
            throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) res;
        response.setHeader("Access-Control-Allow-Origin","*");
        response.setHeader("Access-Control-Allow-Credentials", "true");
        response.setHeader("Access-Control-Allow-Methods", 
            "POST, GET, PATCH, DELETE, PUT");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", 
            "Origin, X-Requested-With, Content-Type, Accept");
        chain.doFilter(req, res);
    }
}

方案3：采用注解@CrossOrigin

@RestController
@CrossOrigin
@RequestMapping("/situation")
public class TestController {

}

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