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XMLHttpRequest cannot load http:/XXX. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:8080' is therefore not allowed access.
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下载cors-filter-1.7.jar，java-property-utils-1.9.jar这两个库文件，放到lib目录下。（可在http://search.maven.org上查询并下载。）工程项目中web.xml中的配置如下：
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