JAVA服务端配置允许跨域请求

CORS是一个W3C标准，全称是”跨域资源共享”（Cross-origin resource sharing）。 它允许浏览器向跨源服务器，发出XMLHttpRequest请求，从而克服了AJAX只能同源使用的限制。

1.加入CROS依赖的包

1<dependency>
2	<groupId>com.thetransactioncompany</groupId>
3	<artifactId>java-property-utils</artifactId>
4	<version>1.10</version>
5</dependency>
6<dependency>
7	<groupId>com.thetransactioncompany</groupId>
8	<artifactId>cors-filter</artifactId>
9	<version>1.9.1</version>
10</dependency>

2. web.xml 加入CORSFilter

1<filter>
2	<filter-name>CORS</filter-name>
3		<filter-class>com.thetransactioncompany.cors.CORSFilter</filter-class>
4		<init-param>
5			<param-name>cors.allowOrigin</param-name>
6			<param-value>*</param-value>
7		</init-param>
8		<init-param>
9			<param-name>cors.supportedMethods</param-name>
10			<param-value>GET, POST, HEAD, PUT, DELETE</param-value>
11		</init-param>
12		<init-param>
13			<param-name>cors.supportedHeaders</param-name>
14			<param-value>Accept, Origin, X-Requested-With, Content-Type,
15				Last-Modified</param-value>
16		</init-param>
17		<init-param>
18			<param-name>cors.exposedHeaders</param-name>
19			<param-value>Set-Cookie</param-value>
20		</init-param>
21		<init-param>
22			<param-name>cors.supportsCredentials</param-name>
23			<param-value>true</param-value>
24		</init-param>
25	</filter>
26	<filter-mapping>
27		<filter-name>CORS</filter-name>
28		<url-pattern>/*</url-pattern>
29	</filter-mapping>
30</fitler>

注意点

CORSFilter 放在最上边，最先被加载，不然无效