ajax跨域访问

No 'Access-Control-Allow-Origin' header is present on the requested resource.

在请求的java方法中加入 
ServletActionContext.getResponse().setHeader("Access-Control-Allow-Origin", "*");
即可

response.setHeader("Access-Control-Allow-Origin", "*");

参考：http://bbs.csdn.net/topics/390650335?page=1


接口跨域访问完全解决方案（java五种跨域解决方案）

解决 "Access-Control-Allow-Methods 列表中不存在请求方法 DELETE" 错误


Springboot统一跨域配置

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;

/**
 * 跨域配置
 */
@Configuration
@Slf4j
public class CorsConfig {
    // 设置允许跨域的源
    private static String[] originsVal = new String[]{
            "127.0.0.1:8080",
            "localhost:8080",
            "desktop.jdcloud.com"
    };

    /**
     * 跨域过滤器
     *
     * @return
     */
    @Bean
    public CorsFilter corsFilter() {
        log.info("corsFilter already execute.");
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        this.addAllowedOrigins(corsConfiguration);
        corsConfiguration.addAllowedHeader("*");
        corsConfiguration.addAllowedMethod("*");
        corsConfiguration.addAllowedOrigin("*");
        source.registerCorsConfiguration("/**", corsConfiguration);
        return new CorsFilter(source);
    }

    private void addAllowedOrigins(CorsConfiguration corsConfiguration) {
        for (String origin : originsVal) {
            corsConfiguration.addAllowedOrigin("http://" + origin);
            corsConfiguration.addAllowedOrigin("https://" + origin);
        }
    }
}