本篇内容主要讲解“使用Java如何解决跨域问题”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“使用Java如何解决跨域问题”吧!

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跨域问题

现在绝大多数公司的项目都是前后端分离的，前后端分离后势必会遇到跨域问题。如下图

继续debug发现，reponse为undefined，提示消息为Network Error。

所以当你和前端联调的时候一直请求失败，报网络错误，一般情况下是后端没有做跨域配置。

注意此时并不是后端没有收到请求，而是收到请求了，也返回结果了，但是浏览器将结果拦截了，并且报错。

同源策略

那么浏览器为什么会报错呢?

因为浏览器基于安全考虑而引入的同源策略

当协议+域名+端口三者都相同时，才不会产生跨域问题，即同源。此时才能读取到服务端的响应

为什么要有同源策略呢?

当然是为了安全起见，举个例子，以银行转账为例，看看你的钱是怎么没的

这就是著名的CSRF攻击(跨站请求伪造，当然还有很多其他方式)，还有如果第5步不对请求的来源进行校验，那么你的钱已经被转走了

html页面中的如下三个标签是允许跨域加载资源的

如何解决跨域

虽然同源策略保证了安全，但一些合理的用途也会受到影响。解决跨域的方式有很多种，简单介绍2个

JSONP

JSONP主要是利用

基本 文件 流程 错误 SQL 调试

1. 请求信息 : 2026-05-09 06:39:39 HTTP/1.1 GET : /article/jjsjjh.html
2. 运行时间 : 0.0479s ( Load:0.0029s Init:0.0013s Exec:0.0325s Template:0.0112s )
3. 吞吐率 : 20.88req/s
4. 内存开销 : 493.20 kb
5. 查询信息 : 12 queries 5 writes
6. 文件加载 : 36
7. 缓存信息 : 0 gets 0 writes
8. 配置加载 : 130
9. 会话信息 : SESSION_ID=pli97uo320gpm3hoiqa9t4g7t3

1. /home/wwwroot/bluegullmedia/wwwroot/index.php ( 1.09 KB )
2. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/ThinkPHP.php ( 4.61 KB )
3. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Think.class.php ( 12.26 KB )
4. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Storage.class.php ( 1.37 KB )
5. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Storage/Driver/File.class.php ( 3.52 KB )
6. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Mode/common.php ( 2.82 KB )
7. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Common/functions.php ( 53.56 KB )
8. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Hook.class.php ( 4.01 KB )
9. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/App.class.php ( 13.49 KB )
10. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Dispatcher.class.php ( 14.79 KB )
11. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Route.class.php ( 13.36 KB )
12. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Controller.class.php ( 11.23 KB )
13. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/View.class.php ( 7.59 KB )
14. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Behavior/BuildLiteBehavior.class.php ( 3.68 KB )
15. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Behavior/ParseTemplateBehavior.class.php ( 3.88 KB )
16. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Behavior/ContentReplaceBehavior.class.php ( 1.91 KB )
17. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Conf/convention.php ( 11.15 KB )
18. /home/wwwroot/bluegullmedia/wwwroot/App/Common/Conf/config.php ( 2.16 KB )
19. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Lang/zh-cn.php ( 2.55 KB )
20. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Conf/debug.php ( 1.49 KB )
21. /home/wwwroot/bluegullmedia/wwwroot/App/Home/Conf/config.php ( 0.31 KB )
22. /home/wwwroot/bluegullmedia/wwwroot/App/Home/Common/function.php ( 3.33 KB )
23. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Behavior/ReadHtmlCacheBehavior.class.php ( 5.62 KB )
24. /home/wwwroot/bluegullmedia/wwwroot/App/Home/Controller/ArticleController.class.php ( 6.02 KB )
25. /home/wwwroot/bluegullmedia/wwwroot/App/Home/Controller/CommController.class.php ( 1.60 KB )
26. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Model.class.php ( 60.11 KB )
27. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Db.class.php ( 32.43 KB )
28. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Db/Driver/Pdo.class.php ( 16.74 KB )
29. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Cache.class.php ( 3.83 KB )
30. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Cache/Driver/File.class.php ( 5.87 KB )
31. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Template.class.php ( 28.16 KB )
32. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Template/TagLib/Cx.class.php ( 22.40 KB )
33. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Template/TagLib.class.php ( 9.16 KB )
34. /home/wwwroot/bluegullmedia/wwwroot/App/Runtime/Cache/Home/7540f392f42b28b481b30614275e4e55.php ( 18.20 KB )
35. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Behavior/WriteHtmlCacheBehavior.class.php ( 0.97 KB )
36. /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Behavior/ShowPageTraceBehavior.class.php ( 5.24 KB )

1. [ app_init ] --START--
2. Run Behavior\BuildLiteBehavior [ RunTime:0.000023s ]
3. [ app_init ] --END-- [ RunTime:0.000123s ]
4. [ app_begin ] --START--
5. Run Behavior\ReadHtmlCacheBehavior [ RunTime:0.000217s ]
6. [ app_begin ] --END-- [ RunTime:0.000269s ]
7. [ view_parse ] --START--
8. [ template_filter ] --START--
9. Run Behavior\ContentReplaceBehavior [ RunTime:0.000145s ]
10. [ template_filter ] --END-- [ RunTime:0.000206s ]
11. Run Behavior\ParseTemplateBehavior [ RunTime:0.010147s ]
12. [ view_parse ] --END-- [ RunTime:0.010205s ]
13. [ view_filter ] --START--
14. Run Behavior\WriteHtmlCacheBehavior [ RunTime:0.000118s ]
15. [ view_filter ] --END-- [ RunTime:0.000146s ]
16. [ app_end ] --START--

1. 1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1 [ SQL语句 ] : SELECT `id`,`pid`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1
2. 1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1
3. 1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( pid= )
4. [8] Undefined index: pid /home/wwwroot/bluegullmedia/wwwroot/App/Home/Controller/ArticleController.class.php 第 47 行.
5. [2] mkdir(): Permission denied /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 59 行.
6. [2] mkdir(): Permission denied /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 59 行.
7. [8] Undefined index: db_host /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Db.class.php 第 120 行.
8. [8] Undefined index: db_port /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Db.class.php 第 121 行.
9. [8] Undefined index: db_name /home/wwwroot/bluegullmedia/wwwroot/ThinkPHP/Library/Think/Db.class.php 第 122 行.

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