第一种方法

在Controller类或方法上加上@CrossOrigin元注解

package com.wzq.test.action;

import com.wzq.utils.BatchDownFilesUtils;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.*;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.List;

/**
 * @description: 测试Controller
 * @author: Wzq
 * @create: 2019-11-25 10:19
 */
@CrossOrigin(origins = "*")
@RestController
@RequestMapping(value = "test")
public class TestController {
    @RequestMapping(value = "/test.do")
    public String test(){
        return "test";
    }

}

这种方式对于整个项目都要跨域，那么每个类上都要加@CrossOrigin元注解,比较麻烦，下面讲解下全局跨域配置。

第二种 拦截器的方式

package com.wzq;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;


@SpringBootApplication
public class MyprojectApplication {

    public static void main(String[] args) {
        SpringApplication.run(MyprojectApplication.class, args);
    }

    @Bean
    public FilterRegistrationBean corsFilter() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        CorsConfiguration config = new CorsConfiguration();
        config.setAllowCredentials(true);
        config.addAllowedOrigin("*");
        config.addAllowedHeader("*");
        config.addAllowedMethod("*");
        source.registerCorsConfiguration("/**", config); // CORS 配置对所有接口都有效
        FilterRegistrationBean bean = new FilterRegistrationBean(new CorsFilter(source));
        bean.setOrder(0);
        return bean;
    }

}

第三种 集成WebMvcConfigurerAdapter类重写 addCorsMappings方法

package com.meeno.wzq;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

/**
 * @Auther: Wzq
 * @Date: 2019/4/11 18:30
 * @Description: 天青色等烟雨，而我在等你.. -- CORSConfiguration
 */
@Configuration
public class CORSConfiguration  extends WebMvcConfigurerAdapter {

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

第三种有个问题，session无法共享!

第四种 使用nginx代理 把前端项目和服务端api接口地址,保持在同一个ip和端口中

完整的nginx配置如下:

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;

    #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
    #                  '$status $body_bytes_sent "$http_referer" '
    #                  '"$http_user_agent" "$http_x_forwarded_for"';

    #access_log  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

    server {
        listen       20684;
        server_name  inner.meeno.net;

        #charset koi8-r;

        #access_log  logs/host.access.log  main;

        location /trainsys {
            #root   html;
            #index  index.html index.htm;
            client_max_body_size 100000m;
            proxy_set_header Host $host;
            proxy_set_header X-Real-Ip $remote_addr;
            proxy_set_header X-Forwarded-For $remote_addr;
            proxy_pass http://inner.meeno.net:20681/trainsys/;
        }

        
        
        location /dist {
            root   E:\svnResourse\program\webTwo\sysBankAdmin-Vue;
            index  index.html index.htm;
        }

        #error_page  404              /404.html;

        # redirect server error pages to the static page /50x.html
        #
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }

        # proxy the PHP scripts to Apache listening on 127.0.0.1:80
        #
        #location ~ \.php$ {
        #    proxy_pass   http://127.0.0.1;
        #}

        # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
        #
        #location ~ \.php$ {
        #    root           html;
        #    fastcgi_pass   127.0.0.1:9000;
        #    fastcgi_index  index.php;
        #    fastcgi_param  SCRIPT_FILENAME  /scripts$fastcgi_script_name;
        #    include        fastcgi_params;
        #}

        # deny access to .htaccess files, if Apache's document root
        # concurs with nginx's one
        #
        #location ~ /\.ht {
        #    deny  all;
        #}
    }


    # another virtual host using mix of IP-, name-, and port-based configuration
    #
    #server {
    #    listen       8000;
    #    listen       somename:8080;
    #    server_name  somename  alias  another.alias;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}


    # HTTPS server
    #
    #server {
    #    listen       443 ssl;
    #    server_name  localhost;

    #    ssl_certificate      cert.pem;
    #    ssl_certificate_key  cert.key;

    #    ssl_session_cache    shared:SSL:1m;
    #    ssl_session_timeout  5m;

    #    ssl_ciphers  HIGH:!aNULL:!MD5;
    #    ssl_prefer_server_ciphers  on;

    #    location / {
    #        root   html;
    #        index  index.html index.htm;
    #    }
    #}

}

主要看这段:

listen       8080; #端口
server_name  127.0.0.1;#ip或域名

#服务端api基地值
 location /trainsys { 
            #root   html;
            #index  index.html index.htm;
            client_max_body_size 100000m;
            proxy_set_header Host $host;
            proxy_set_header X-Real-Ip $remote_addr;
            proxy_set_header X-Forwarded-For $remote_addr;
            proxy_pass http://inner.meeno.net:20681/trainsys/;
        }

        
        #web端项目映射地址
        location /dist {
            root   E:\svnResourse\program\webTwo\sysBankAdmin-Vue;
            index  index.html index.htm;
        }