問題描述

No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://127.0.0.1:8020' is therefore not allowed access.

瀏覽器跨域測試

• 直接使用瀏覽器開發者工具, 在控制臺執行代碼測試

// 正常情況
var xhr = new XMLHttpRequest();
xhr.open('GET', 'http://localhost:8080/test.pdf');
xhr.send(null);
xhr.onload = function(e) {
    var xhr = e.target;
    console.error(xhr.responseText);
}

// 跨域
var xhr = new XMLHttpRequest();
xhr.open('GET', 'http://127.0.0.1:8080/themes/zone/casepdf/177.pdf');
xhr.send(null);
xhr.onload = function(e) {
    var xhr = e.target;
    console.log(xhr.responseText);
}

Tomcat 跨域配置

web.xml

<filter>
  <filter-name>CorsFilter</filter-name>
  <filter-class>org.apache.catalina.filters.CorsFilter</filter-class>
  <init-param>
    <param-name>cors.allowed.origins</param-name>
    <param-value>*</param-value>
  </init-param>
</filter>
<filter-mapping>
  <filter-name>CorsFilter</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping>

Spring跨域配置

http://www.rzrgm.cn/52liming/p/9535636.html

參考博客

Spring MVC通過CROS協議解決跨域問題

作者原文鏈接：http://www.imooc.com/article/7719

spring 官方文檔：

鏈接：https://docs.spring.io/spring/docs/current/spring-framework-reference/web.html#mvc-cors