{"id":669,"date":"2017-03-10T10:04:26","date_gmt":"2017-03-10T02:04:26","guid":{"rendered":"http:\/\/www.rainweb.site\/?p=596"},"modified":"2023-08-07T20:57:28","modified_gmt":"2023-08-07T12:57:28","slug":"java-article65","status":"publish","type":"post","link":"http:\/\/rain1024.com\/index.php\/2017\/03\/10\/java-article65\/","title":{"rendered":"Java\u7f51\u7edc\u7f16\u7a0b\u7684\u56db\u79cd\u7c7b"},"content":{"rendered":"

Java\u7f51\u7edc\u7f16\u7a0b<\/p>\n

Java\u7f51\u7edcAPI<\/h2>\n

1. InetAddress\u7c7b<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n
\u65b9\u6cd5<\/th>\n\u529f\u80fd<\/th>\n<\/tr>\n<\/thead>\n
public static InetAddress getLocalHost<\/td>\n\u83b7\u53d6\u672c\u673a\u5bf9\u5e94\u7684InetAddress\u5bf9\u8c61<\/td>\n<\/tr>\n
public static InetAddress getByName(String host)<\/td>\n\u6839\u636e\u4e3b\u673a\u83b7\u5f97\u5bf9\u5e94\u7684InetAddress\u5bf9\u8c61\uff0c\u53c2\u6570host\u53ef\u4ee5\u662fip\u5730\u5740\u6216\u57df\u540d<\/td>\n<\/tr>\n
public static InetAddress[] getAllByName(String host)<\/td>\n\u6839\u636e\u4e3b\u673a\u83b7\u5f97\u5177\u6709\u76f8\u540c\u540d\u5b57\u7684\u4e00\u7ec4InetAddress\u5bf9\u8c61<\/td>\n<\/tr>\n
public static InetAddress getByAddress(byte[] addr)<\/td>\n\u83b7\u53d6a\u5bf9\u8c61ddr\u6240\u5c01\u88c5\u7684IP\u5730\u5740\u5bf9\u5e94\u7684InetAddress<\/td>\n<\/tr>\n
public String getCanonicalHost()<\/td>\n\u83b7\u53d6\u6b64IP\u5730\u5740\u7684\u5168\u9650\u5b9a\u57df\u540d<\/td>\n<\/tr>\n
public bytes[] getHostAddress()<\/td>\n\u83b7\u53d6\u8be5InetAddress\u5bf9\u8c61\u5bf9\u5e94\u7684IP\u5730\u5740\u5b57\u7b26\u4e32<\/td>\n<\/tr>\n
public String getHostName()<\/td>\n\u83b7\u53d6\u8be5InetAddress\u5bf9\u8c61\u7684\u4e3b\u673a\u540d\u79f0<\/td>\n<\/tr>\n
public boolean isReachable(int timeout)<\/td>\n\u5224\u65ad\u662f\u5426\u53ef\u4ee5\u5230\u8fbe\u8be5\u5730\u5740<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u793a\u4f8b\u4ee3\u7801\uff1a<\/h3>\n
package com.rain.demo;\nimport java.io.IOException;\nimport java.net.InetAddress;\nimport java.net.UnknownHostException;\n\/**\n * Created by w-pc on 2017\/02\/27.\n * java\u7f51\u7edc\u7f16\u7a0b\n *\/\npublic class InetAddressDemo {\n    public static void main(String[] args) {\n        try {\n            \/\/\u672c\u673a\u64cd\u4f5c\uff0c\u83b7\u53d6\u672c\u673a\u5730\u5740\u4fe1\u606f\n            InetAddress loca = InetAddress.getLocalHost();\n            System.out.println(\"\u672c\u673a\u7684\u5168\u9650\u5b9a\u57df\u540d:\"+loca.getCanonicalHostName());\n            System.out.println(\"\u672c\u673a\u7684IP\u5730\u5740\uff1a\"+loca.getHostAddress());\n            System.out.println(\"\u672c\u673a\u7684\u4e3b\u673a\u540d\u79f0\uff1a\"+loca.getHostName());\n            System.out.println(\"\u672c\u673a\u7684\u540d\u79f0\u4e0eIP\uff1a\"+loca.toString());\n            System.out.println(\"\u662f\u5426\u53ef\u4ee5\u5230\u8fbe\uff1a\"+loca.isReachable(5000));\n            System.out.println(\"*********************************************************\");\n            \/\/\u8bbf\u95ee\u6211\u670d\u52a1\u5668\u4e0a\u7684\u535a\u5ba2\n            InetAddress loca_blog = InetAddress.getByName(\"www.rainweb.site\");\n            System.out.println(\"\u535a\u5ba2\u7684\u5168\u9650\u5b9a\u57df\u540d:\"+loca_blog.getCanonicalHostName());\n            System.out.println(\"\u535a\u5ba2\u7684IP\u5730\u5740\uff1a\"+loca_blog.getHostAddress());\n            System.out.println(\"\u535a\u5ba2\u7684\u4e3b\u673a\u540d\u79f0\uff1a\"+loca_blog.getHostName());\n            System.out.println(\"\u535a\u5ba2\u7684\u540d\u79f0\u4e0eIP\uff1a\"+loca_blog.toString());\n            System.out.println(\"\u662f\u5426\u53ef\u4ee5\u5230\u8fbe\uff1a\"+loca_blog.isReachable(5000));\n            System.out.println(\"*********************************************************\");\n            \/\/\u8bbf\u95ee\u6d4b\u8bd5IP\u5730\u5740127.0.0.1\n            InetAddress loca_try = InetAddress.getByAddress(new byte[]{127,0,0,1});\n            System.out.println(\"\u5168\u9650\u5b9a\u57df\u540d:\"+loca_try.getCanonicalHostName());\n            System.out.println(\"IP\u5730\u5740\uff1a\"+loca_try.getHostAddress());\n            System.out.println(\"\u4e3b\u673a\u540d\u79f0\uff1a\"+loca_try.getHostName());\n            System.out.println(\"\u540d\u79f0\u4e0eIP\uff1a\"+loca_try.toString());\n            System.out.println(\"\u662f\u5426\u53ef\u4ee5\u5230\u8fbe\uff1a\"+loca_try.isReachable(5000));\n        } catch (UnknownHostException e) {\n            e.printStackTrace();\n        } catch (IOException e) {\n            e.printStackTrace();\n        }\n    }\n}\n\n<\/code><\/pre>\n
\u7ed3\u679c<\/h3>\n
\u672c\u673a\u7684\u5168\u9650\u5b9a\u57df\u540d:W-PC\n\u672c\u673a\u7684IP\u5730\u5740\uff1a192.168.225.1\n\u672c\u673a\u7684\u4e3b\u673a\u540d\u79f0\uff1aW-PC\n\u672c\u673a\u7684\u540d\u79f0\u4e0eIP\uff1aW-PC\/192.168.225.1\n\u662f\u5426\u53ef\u4ee5\u5230\u8fbe\uff1atrue\n*********************************************************\n\u535a\u5ba2\u7684\u5168\u9650\u5b9a\u57df\u540d:59.111.97.112\n\u535a\u5ba2\u7684IP\u5730\u5740\uff1a59.111.97.112\n\u535a\u5ba2\u7684\u4e3b\u673a\u540d\u79f0\uff1awww.rainweb.site\n\u535a\u5ba2\u7684\u540d\u79f0\u4e0eIP\uff1awww.rainweb.site\/59.111.97.112\n\u662f\u5426\u53ef\u4ee5\u5230\u8fbe\uff1atrue\n*********************************************************\n\u5168\u9650\u5b9a\u57df\u540d:127.0.0.1\nIP\u5730\u5740\uff1a127.0.0.1\n\u4e3b\u673a\u540d\u79f0\uff1a127.0.0.1\n\u540d\u79f0\u4e0eIP\uff1a127.0.0.1\/127.0.0.1\n\u662f\u5426\u53ef\u4ee5\u5230\u8fbe\uff1atrue\n<\/code><\/pre>\n
2. URL\u7c7b<\/h2>\n
protocol:\/\/host:port\/resourceName<\/code><\/p>\n
    \n
  • protocol\u662f\u534f\u8bae\u540d<\/li>\n
  • host\u662f\u4e3b\u673a\u540d<\/li>\n
  • port\u662f\u7aef\u53e3\u53f7<\/li>\n
  • resourceName\u662f\u8d44\u6e90\u540d<\/li>\n<\/ul>\n\n\n\n\n\n\n\n
    \u65b9\u6cd5<\/th>\n\u529f\u80fd\u63cf\u8ff0<\/th>\n<\/tr>\n<\/thead>\n
    public URL(String spec)<\/td>\n\u6784\u9020\u65b9\u6cd5\uff0c\u6839\u636e\u6307\u5b9a\u7684\u5b57\u7b26\u4e32\u6765\u521b\u5efa\u4e00\u4e2aURL\u5bf9\u8c61<\/td>\n<\/tr>\n
    public URL(String protocol,String host,int port,String file)<\/td>\n\u6784\u9020\u65b9\u6cd5\uff0c\u6839\u636e\u6307\u5b9a\u7684\u534f\u8bae\uff0c\u4e3b\u673a\u540d\uff0c\u7aef\u53e3\u53f7\u548c\u6587\u4ef6\u8d44\u6e90\u6765\u521b\u5efa\u4e00\u4e2aURL\u5bf9\u8c61<\/td>\n<\/tr>\n
    public URL(String protocol String host,String file)<\/td>\n\u6784\u9020\u65b9\u6cd5\uff0c\u6839\u636e\u6307\u5b9a\u7684\u534f\u8bae\uff0c\u4e3b\u673a\u540d\u548c\u6587\u4ef6\u8d44\u6e90\u6765\u521b\u5efaURL\u5bf9\u8c61<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
    \u65b9\u6cd5<\/th>\n\u529f\u80fd\u63cf\u8ff0<\/th>\n<\/tr>\n<\/thead>\n
    public String getProtocol<\/td>\n\u8fd4\u56de\u534f\u8bae\u540d<\/td>\n<\/tr>\n
    public String getHost()<\/td>\n\u8fd4\u56de\u4e3b\u673a\u540d<\/td>\n<\/tr>\n
    public int getPort()<\/td>\n\u8fd4\u56de\u7aef\u53e3\u53f7\uff0c\u5982\u6ca1\u6709\u5219\u8fd4\u56de-1<\/td>\n<\/tr>\n
    public String getFile()<\/td>\n\u8fd4\u56de\u6587\u4ef6\u540d<\/td>\n<\/tr>\n
    public String getRef()<\/td>\n\u8fd4\u56deURL\u7684\u951a<\/td>\n<\/tr>\n
    public String getQuery()<\/td>\n\u8fd4\u56deURL\u7684\u67e5\u8be2\u4fe1\u606f<\/td>\n<\/tr>\n
    public String getPath()<\/td>\n\u8fd4\u56deURL\u7684\u8def\u5f84<\/td>\n<\/tr>\n
    public URLConnection openConnection()<\/td>\n\u8fd4\u56de\u4e00\u4e2aURLConnection\u5bf9\u8c61<\/td>\n<\/tr>\n
    public final InputStream openStream()<\/td>\n\u8fd4\u56de\u4e00\u4e2a\u7528\u4e8e\u8bfb\u53d6\u8be5URL\u8d44\u6e90\u7684InputStream\u6d41<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
    package com.rain.demo;\n\nimport java.net.MalformedURLException;\nimport java.net.URL;\n\n\/**\n * Created by w-pc on 2017\/03\/08.\n *\/\npublic class URLDemo {\n    public static void main(String[] args) {\n        String url = \"http:\/\/www.rainweb.site:80\/index.php\";\n        try {\n            URL blog = new URL(url);\n            System.out.println(\"\u8fd4\u56de\u534f\u8bae\u540d\uff1a\"+blog.getProtocol());\n            System.out.println(\"\u8fd4\u56de\u4e3b\u673a\u540d\uff1a\"+blog.getHost());\n            System.out.println(\"\u8fd4\u56de\u7aef\u53e3\u53f7\uff1a\"+blog.getPort());\n            System.out.println(\"\u8fd4\u56de\u6587\u4ef6\u540d\uff1a\"+blog.getFile());\n            System.out.println(\"\u8fd4\u56deURL\u7684\u951a\uff1a\"+blog.getRef());\n            System.out.println(\"\u8fd4\u56deURL\u7684\u67e5\u8be2\u4fe1\u606f\uff1a\"+blog.getQuery());\n            System.out.println(\"\u8fd4\u56deURL\u7684\u8def\u5f84\uff1a\"+blog.getPath());\n            System.out.println(\"\");\n        }catch (MalformedURLException e){\n            e.printStackTrace();\n        }\n    }\n}\n\n<\/code><\/pre>\n
    \u7ed3\u679c\uff1a<\/h3>\n
    \u8fd4\u56de\u534f\u8bae\u540d\uff1ahttp\n\u8fd4\u56de\u4e3b\u673a\u540d\uff1awww.rainweb.site\n\u8fd4\u56de\u7aef\u53e3\u53f7\uff1a80\n\u8fd4\u56de\u6587\u4ef6\u540d\uff1a\/index.php\n\u8fd4\u56deURL\u7684\u951a\uff1anull\n\u8fd4\u56deURL\u7684\u67e5\u8be2\u4fe1\u606f\uff1anull\n\u8fd4\u56deURL\u7684\u8def\u5f84\uff1a\/index.php\n<\/code><\/pre>\n
    3.URLConnection\u7c7b<\/h2>\n
    URLConnection\u4ee3\u8868\u4e0eURL\u6307\u5b9a\u7684\u6570\u636e\u6e90\u7684\u52a8\u6001\u8fde\u63a5\uff0c\u8be5\u7c7b\u63d0\u4f9b\u4e00\u4e9b\u6bd4URL\u7c7b\u66f4\u5f3a\u5927\u7684\u670d\u52a1\u5668\u4ea4\u4e92\u63a7\u5236\u7684\u65b9\u6cd5\uff0c\u5141\u8bb8\u4f7f\u7528POST\u6216PUT\u548c\u5176\u4ed6HTTP\u8bf7\u6c42\u65b9\u6cd5\u5c06\u6570\u636e\u9001\u56de\u670d\u52a1\u5668\u3002URLConnection\u662f\u4e00\u4e2a\u62bd\u8c61\u7c7b\u3002<\/p>\n\n\n\n\n\n\n\n\n\n\n\n
    \u65b9\u6cd5<\/th>\n\u529f\u80fd\u63cf\u8ff0<\/th>\n<\/tr>\n<\/thead>\n
    public int getContentLength()<\/td>\n\u83b7\u5f97\u6587\u4ef6\u7684\u957f\u5ea6<\/td>\n<\/tr>\n
    public String getContentType()<\/td>\n\u83b7\u5f97\u6587\u4ef6\u7684\u7c7b\u578b<\/td>\n<\/tr>\n
    public long getDate()<\/td>\n\u83b7\u5f97\u6587\u4ef6\u521b\u5efa\u7684\u65f6\u95f4<\/td>\n<\/tr>\n
    public long getLastModified()<\/td>\n\u83b7\u5f97\u6587\u4ef6\u6700\u540e\u4fee\u6539\u7684\u65f6\u95f4<\/td>\n<\/tr>\n
    public InputStream getInputStream()<\/td>\n\u83b7\u5f97\u8f93\u5165\u6d41\uff0c\u4ee5\u4fbf\u8bfb\u53d6\u6587\u4ef6\u7684\u6570\u636e<\/td>\n<\/tr>\n
    public OuputStream getOutputStream()<\/td>\n\u83b7\u5f97\u8f93\u51fa\u6d41\uff0c\u4ee5\u4fbf\u8f93\u51fa\u6570\u636e<\/td>\n<\/tr>\n
    public void setRequestProperty(String key,String value)<\/td>\n\u8bbe\u7f6e\u8bf7\u6c42\u5c5e\u6027\u503c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
    \u83b7\u53d6\u7f51\u9875\u6e90\u4ee3\u7801<\/h3>\n
    package com.rain.demo;\n\nimport java.io.BufferedReader;\nimport java.io.IOException;\nimport java.io.InputStreamReader;\nimport java.net.MalformedURLException;\nimport java.net.URL;\nimport java.net.URLConnection;\n\n\/**\n * Created by w-pc on 2017\/03\/08.\n *\/\npublic class URLDemo {\n    public static void main(String[] args) {\n        String url = \"http:\/\/www.rainweb.site:80\/index.php\";\n        try {\n            \/\/\u6784\u5efaURL\u5bf9\u8c61\n            URL blog = new URL(url);\n            \/\/\u7531URL\u5bf9\u8c61\u83b7\u53d6URLConnection\u5bf9\u8c61\n            URLConnection urlConn = blog.openConnection();\n            \/\/\u8bbe\u7f6e\u8bf7\u6c42\u5c5e\u6027\uff0c\u5b57\u7b26\u96c6\n            urlConn.setRequestProperty(\"Charset\", \"UTF-8\");\n            \/\/\u7531URLConnection\u83b7\u53d6\u8f93\u5165\u6d41\uff0c\u5e76\u6784\u9020BufferedReader\u5bf9\u8c61\n            BufferedReader br = new BufferedReader(new InputStreamReader(urlConn.getInputStream()));\n            String inputLine;\n            while ((inputLine = br.readLine()) != null){\n                System.out.println(inputLine);\n            }\n            br.close();\n        }catch (MalformedURLException e){\n            e.printStackTrace();\n        } catch (IOException e) {\n            e.printStackTrace();\n        }\n    }\n}\n\n<\/code><\/pre>\n
    4.URKDecoder\u7c7b\u548cURLEncoder\u7c7b\u7684\u4f7f\u7528<\/h2>\n
    package com.qst.chapter06;\nimport java.io.UnsupportedEncodingException;\nimport java.net.URLDecoder;\nimport java.net.URLEncoder;\npublic class URLDecoderDemo {\n    public static void main(String[] args) {\n        try {\n            \/\/ \u5c06\u666e\u901a\u5b57\u7b26\u4e32\u8f6c\u6362\u6210application\/x-www-form-urlencoded\u5b57\u7b26\u4e32\n            String urlStr = URLEncoder.encode(\"Java 8\u9ad8\u7ea7\u5e94\u7528\u4e0e\u5f00\u53d1\", \"GBK\");\n            System.out.println(urlStr);\n\n            \/\/ \u5c06application\/x-www-form-urlencoded\u5b57\u7b26\u4e32 \u8f6c\u6362\u6210\u666e\u901a\u5b57\u7b26\u4e32\n            String keyWord = URLDecoder.decode(\n                    \"Java+8%B8%DF%BC%B6%D3%A6%D3%C3%D3%EB%BF%AA%B7%A2\", \"GBK\");\n            System.out.println(keyWord);\n        } catch (UnsupportedEncodingException e) {\n            e.printStackTrace();\n        }\n    }\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
    Java\u7f51\u7edc\u7f16\u7a0b Java\u7f51\u7edcAPI 1. InetAddress\u7c7b \u65b9\u6cd5 \u529f\u80fd public static \u2026 Read More »<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":472,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"aside","meta":{"footnotes":""},"categories":[31],"tags":[46],"class_list":["post-669","post","type-post","status-publish","format-aside","has-post-thumbnail","hentry","category-java","tag-java","post_format-post-format-aside"],"_links":{"self":[{"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/posts\/669","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/comments?post=669"}],"version-history":[{"count":1,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/posts\/669\/revisions"}],"predecessor-version":[{"id":1472,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/posts\/669\/revisions\/1472"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/media\/472"}],"wp:attachment":[{"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/media?parent=669"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/categories?post=669"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/rain1024.com\/index.php\/wp-json\/wp\/v2\/tags?post=669"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}