在处理跨域AJAX请求有许多方法。我这里用的是 CORS,
CORSFilter
CORSFilter是Apache官方提供一个支持CORS跨域的过滤器：
详细说明： http://tomcat.apache.org/tomcat-7.0-doc/config/filter.html
在maven配置文件中导入依赖
<!--CORS--><dependency> ???<groupId>com.thetransactioncompany</groupId> ???<artifactId>cors-filter</artifactId> ???<version>2.6</version></dependency> ???
在web.xml添加过滤器
<filter> ???????<filter-name>CORS</filter-name> ???????<filter-class>com.thetransactioncompany.cors.CORSFilter</filter-class> ???????<init-param> ???????????<param-name>cors.allowOrigin</param-name> ???????????<param-value>http://127.0.0.1:8020</param-value> ???????</init-param> ???????<init-param> ???????????<param-name>cors.supportedMethods</param-name> ???????????<param-value>POST,GET,OPTIONS,DELETE,PUT</param-value> ???????</init-param> ???????<init-param> ???????????<param-name>cors.supportedHeaders</param-name> ???????????<param-value>Content-Type,Accept,Origin,XRequestedWith,ContentType,LastModified</param-value> ???????</init-param> ???????<init-param> ???????????<param-name>cors.exposedHeaders</param-name> ???????????<param-value>SetCookie</param-value> ???????</init-param> ???????<init-param> ???????????<param-name>cors.supportsCredentials</param-name> ???????????<param-value>true</param-value> ???????</init-param> ???</filter> ???<filter-mapping> ???????<filter-name>CORS</filter-name> ???????<url-pattern>/*</url-pattern> ???</filter-mapping>
客户端
<!DOCTYPE html><html> ???<head> ???????<meta charset="UTF-8"> ???????<title>跨域AJAX请求</title> ???</head> ???<body> ???????<h2>跨域AJAX请求</h2> ???????<button type="button" id="btnAjax">ajax请求</button> ???????<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script> ???????<script type="text/javascript"> ???????????$("#btnAjax").click(function() { ???????????????$.get("http://localhost:8080/mvc02/users", "", function(data) { ???????????????????console.log(JSON.stringify(data)); ???????????????}, "json"); ???????????}); ???????</script> ???</body></html>服务器(本人用的是Spring MVC):
@RestController@RequestMapping(path="/users")public class UsersController { ???@Resource ???EmpService empService; ???/*查询所有*/ ???@RequestMapping(path = "",method = RequestMethod.GET) ???public List seletUser(){ ???????return empService.findEmpList(); ???}
}结果：
Spring MVC4.2 及以上增加了对CORS的支持
跨域AJAX请求
原文地址：http://www.cnblogs.com/mylhy/p/8034681.html