Tomcat下的配置
下载cors-filter-1.7.jar，Java-property-utils-1.9.jar这两个库文件，放到tomcat的lib目录下。（可在
http://search.maven.org上查询并下载。
在项目的web.xml下配置如下：
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<filter>
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<filter-name>CORS</filter-name>
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<filter-class>com.thetransactioncompany.cors.CORSFilter</filter-class>
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<init-param>
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<param-name>cors.allowOrigin</param-name>
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<param-value>*</param-value>
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</init-param>
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<init-param>
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<param-name>cors.supportedMethods</param-name>
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<param-value>GET, POST, HEAD, PUT, DELETE</param-value>
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</init-param>
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<init-param>
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<param-name>cors.supportedHeaders</param-name>
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<param-value>Accept, Origin, X-Requested-With, Content-Type, Last-Modified</param-value>
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</init-param>
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<init-param>
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<param-name>cors.exposedHeaders</param-name>
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<param-value>Set-Cookie</param-value>
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</init-param>
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<init-param>
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<param-name>cors.supportsCredentials</param-name>
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<param-value>true</param-value>
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</init-param>
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</filter>
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<filter-mapping>
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<filter-name>CORS</filter-name>
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<url-pattern>/*</url-pattern>
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</filter-mapping>
用maven的话需要在maven里添加下载的jar包，如下：
<!--跨域-->
<dependency>
<groupId>com.thetransactioncompany</groupId>
<artifactId>Java-property-utils</artifactId>
<version>1.9</version>
</dependency>
<dependency>
<groupId>com.thetransactioncompany</groupId>
<artifactId>cors-filter</artifactId>
<version>1.7</version>
</dependency>
之后前端就不需要用jsonp来获取数据也没有post限制的问题
http://software.dzhuvinov.com/cors-filter-installation.html
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