\/\/ init registers the default matcher with the program.\nfunc init() {\n var matcher defaultMatcher\n Register("default", matcher)\n}\n\n\/\/ Register is called to register a matcher for use by the program.\nfunc Register(feedType string, matcher Matcher) {\n if _, exists := matchers[feedType]; exists {\n log.Fatalln(feedType, "Matcher already registered")\n }\n\n log.Println("Register", feedType, "matcher")\n matchers[feedType] = matcher\n}<\/code><\/pre>\n\u5982\u4f55\u4f7f\u7528init<\/h3>\n
\u6211\u4eec\u4f7f\u7528\u4e0b\u5212\u7ebf\u6807\u8bc6\u7b26\u4f5c\u4e3a\u522b\u540d\u5bfc\u5165\u5305\uff0c\u5b8c\u6210\u4e86\u8fd9\u4e2a\u8c03\u7528\u3002\u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u8ba9\u7f16\u8bd1\u5668\u5728\u5bfc\u5165\u672a\u88ab\u5f15\u7528\u7684\u5305\u65f6\u4e0d\u62a5\u9519\uff0c\u800c\u4e14\u4f9d\u65e7\u4f1a\u5b9a\u4f4d\u5230\u5305\u5185\u7684init\u51fd\u6570\u3002\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
import (\n _ "December15\/sample\/matchers"\n "December15\/sample\/search"\n)<\/code><\/pre>\n\u7ed3\u6784\u7c7b\u578b<\/h2>\n
golang\u4e2d\u6ca1\u6709\u7c7b\u7684\u6982\u5ff5\uff0c\u8fd9\u91cc\u7684\u7ed3\u6784\u7c7b\u578b\u7684\u4f5c\u7528\u5c31\u76f8\u5f53\u4e8ejava\u91cc\u9762\u7684\u7c7b\uff0c\u4f8b\u5982\u8fd9\u91cc\u5b9a\u4e49\u4e864\u4e2a\u7c7b\uff1a<\/p>\n
type (\n \/\/ item defines the fields associated with the item tag\n \/\/ in the rss document.\n item struct {\n XMLName xml.Name `xml:"item"`\n PubDate string `xml:"pubDate"`\n Title string `xml:"title"`\n Description string `xml:"description"`\n Link string `xml:"link"`\n GUID string `xml:"guid"`\n GeoRssPoint string `xml:"georss:point"`\n }\n\n \/\/ image defines the fields associated with the image tag\n \/\/ in the rss document.\n image struct {\n XMLName xml.Name `xml:"image"`\n URL string `xml:"url"`\n Title string `xml:"title"`\n Link string `xml:"link"`\n }\n\n \/\/ channel defines the fields associated with the channel tag\n \/\/ in the rss document.\n channel struct {\n XMLName xml.Name `xml:"channel"`\n Title string `xml:"title"`\n Description string `xml:"description"`\n Link string `xml:"link"`\n PubDate string `xml:"pubDate"`\n LastBuildDate string `xml:"lastBuildDate"`\n TTL string `xml:"ttl"`\n Language string `xml:"language"`\n ManagingEditor string `xml:"managingEditor"`\n WebMaster string `xml:"webMaster"`\n Image image `xml:"image"`\n Item []item `xml:"item"`\n }\n\n \/\/ rssDocument defines the fields associated with the rss document.\n rssDocument struct {\n XMLName xml.Name `xml:"rss"`\n Channel channel `xml:"channel"`\n }\n)\n<\/code><\/pre>\n\u7a7a\u7ed3\u6784\u5b9e\u73b0\u63a5\u53e3<\/h2>\n
\u672c\u4e66\u63a8\u8350\u5728\u4e0d\u9700\u8981\u7ef4\u62a4\u4efb\u4f55\u72b6\u6001\u7684\u65f6\u5019\uff0c\u7528\u7a7a\u7ed3\u6784\u4f53\u6765\u5b9e\u73b0\u63a5\u53e3\uff0c\u6bd4\u5982\uff1a<\/p>\n
cxtype rssMatcher struct{}\n\nfunc (m rssMatcher) Search(feed *search.Feed, searchTerm string) ([]*search.Result, error) {\n ...\n}\n<\/code><\/pre>\n\u7f51\u7edc\u8bf7\u6c42<\/h2>\n
Golang\u53ef\u4ee5\u975e\u5e38\u5206\u65b9\u4fbf\u7684\u8fdb\u884c\u7f51\u7edc\u8bf7\u6c42\uff0c\u4f8b\u5982\uff1a<\/p>\n
\/\/ retrieve performs a HTTP Get request for the rss feed and decodes the results.\nfunc (m rssMatcher) retrieve(feed *search.Feed) (*rssDocument, error) {\n if feed.URI == "" {\n return nil, errors.New("No rss feed uri provided")\n }\n\n \/\/ Retrieve the rss feed document from the web.\n resp, err := http.Get(feed.URI)\n if err != nil {\n return nil, err\n }\n\n \/\/ Close the response once we return from the function.\n defer resp.Body.Close()\n\n \/\/ Check the status code for a 200 so we know we have received a\n \/\/ proper response.\n if resp.StatusCode != 200 {\n return nil, fmt.Errorf("HTTP Response Error %d\/n", resp.StatusCode)\n }\n\n \/\/ Decode the rss feed document into our struct type.\n \/\/ We don't need to check for errors, the caller can do this.\n var document rssDocument\n err = xml.NewDecoder(resp.Body).Decode(&document)\n return &document, err\n}<\/code><\/pre>\n
\n\u53c2\u8003\uff1aKennedy W , Ketelsen B , Martin E S . Go in action. 2016.<\/p><\/blockquote>\n
![\"\"](\"https:\/\/segmentfault.com\/img\/bVc4VJk\" "\\"\\"")
<\/p>\n