{"id":227824,"date":"2024-05-11T20:56:19","date_gmt":"2024-05-11T12:56:19","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/227824.html"},"modified":"2024-05-11T20:56:26","modified_gmt":"2024-05-11T12:56:26","slug":"%e4%b8%80%e8%a1%8c-java-%e4%bb%a3%e7%a0%81%ef%bc%88%e4%bb%a5%e5%88%86%e5%8f%b7%e7%bb%93%e6%9d%9f%ef%bc%89%e8%83%bd%e5%ae%9e%e7%8e%b0%e4%bb%80%e4%b9%88%e4%b8%a7%e5%bf%83%e7%97%85%e7%8b%82%e7%9a%84","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/227824.html","title":{"rendered":"\u4e00\u884c Java \u4ee3\u7801\uff08\u4ee5\u5206\u53f7\u7ed3\u675f\uff09\u80fd\u5b9e\u73b0\u4ec0\u4e48\u4e27\u5fc3\u75c5\u72c2\u7684\u529f\u80fd"},"content":{"rendered":"

\"\u4e00\u884c<\/p>\n

\u4e00\u884cJava\u4ee3\u7801\uff08\u4ee5\u5206\u53f7\u7ed3\u675f\uff09\u80fd\u5b9e\u73b0\u7684\u4e27\u5fc3\u75c5\u72c2\u7684\u529f\u80fd\u5305\u62ec\uff1a\u521b\u5efa\u4e00\u4e2a\u533f\u540d\u5185\u90e8\u7c7b\u3001\u542f\u52a8\u4e00\u4e2a\u7ebf\u7a0b\u3001\u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9\u3001\u6267\u884c\u4e00\u4e2aWeb\u8bf7\u6c42\u3001\u53cd\u5c04\u8c03\u7528\u65b9\u6cd5<\/strong>\u3001\u51c6\u5907\u6b63\u5219\u8868\u8fbe\u5f0f\u5e76\u66ff\u6362\u5b57\u7b26\u4e32\u4e2d\u7684\u5185\u5bb9<\/strong>\u3002\u6bcf\u9879\u529f\u80fd\u7684\u5b9e\u73b0\u5c5e\u4e8eJava\u7f16\u7a0b\u8bed\u8a00\u7075\u6d3b\u6027\u7684\u4f53\u73b0\uff0c\u4ece\u800c\u5141\u8bb8\u5f00\u53d1\u8005\u7528\u6781\u5176\u7b80\u6d01\u7684\u4ee3\u7801\u5b8c\u6210\u590d\u6742\u7684\u64cd\u4f5c\u3002\u4ee5\u51c6\u5907\u6b63\u5219\u8868\u8fbe\u5f0f\u5e76\u66ff\u6362\u5b57\u7b26\u4e32\u4e2d\u7684\u5185\u5bb9\u4e3a\u4f8b\uff0c\u4ee5\u4e0b\u4e00\u884cJava\u4ee3\u7801\u5373\u53ef\u5b8c\u6210\u591a\u9879\u64cd\u4f5c\uff1a<\/p>\n<\/p>\n

String result = new java.util.Scanner(new java.net.URL("http:\/\/example.com").openStream(), "UTF-8").useDelimiter("\\\\A").next().replaceAll("oldString", "newString");<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u884c\u4ee3\u7801\u6574\u5408\u4e86\u7f51\u7edc\u64cd\u4f5c\u3001\u6d41\u64cd\u4f5c\u548c\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u5904\u7406\uff0c\u4e00\u6c14\u5475\u6210\u5730\u83b7\u53d6\u7f51\u7edc\u8d44\u6e90\u3001\u8bfb\u53d6\u6570\u636e\u3001\u5e76\u8fdb\u884c\u5b57\u7b26\u4e32\u66ff\u6362\u64cd\u4f5c\u3002<\/strong><\/p>\n<\/p>\n
\u4e00\u3001\u521b\u5efa\u533f\u540d\u5185\u90e8\u7c7b<\/h3>\n<\/p>\n
\u5728Java\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u533f\u540d\u5185\u90e8\u7c7b\u6765\u7acb\u5373\u5b9a\u4e49\u548c\u5b9e\u4f8b\u5316\u4e00\u4e2a\u6709\u7740\u7279\u5b9a\u529f\u80fd\u7684\u7c7b\u3002\u8fd9\u79cd\u4e00\u884c\u4ee3\u7801\u7684\u6280\u5de7\u901a\u5e38\u7528\u4e8e\u7b80\u5316\u76d1\u542c\u5668\u6216\u7b80\u5355\u63a5\u53e3\u5b9e\u73b0\u7684\u521b\u5efa\u8fc7\u7a0b\u3002<\/p>\n<\/p>\n
new Thread(() -> System.out.println("Hello, World!")).start();<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u91cc\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u533f\u540d\u7684Thread<\/code>\u5b50\u7c7b\uff0c\u5e76\u91cd\u5199\u4e86\u5176run<\/code>\u65b9\u6cd5\u6765\u8f93\u51fa\u4e00\u6bb5\u6587\u672c\uff0c\u5728\u540c\u4e00\u884c\u4e2d\u542f\u52a8\u4e86\u7ebf\u7a0b\u3002\u5176\u5b9e\u73b0\u4e86\u5728\u6ca1\u6709\u663e\u5f0f\u5b9a\u4e49\u989d\u5916\u7c7b\u7684\u60c5\u51b5\u4e0b\uff0c\u521b\u5efa\u4e86\u4e00\u4e2a\u590d\u6742\u884c\u4e3a\u7684\u5bf9\u8c61\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u542f\u52a8\u4e00\u4e2a\u7ebf\u7a0b<\/h3>\n<\/p>\n
Java\u4e2d\u7ebf\u7a0b\u7684\u542f\u52a8\u53ef\u901a\u8fc7\u4e00\u884c\u4ee3\u7801\u5b9e\u73b0\uff0c\u8fd9\u662f\u591a\u7ebf\u7a0b\u7f16\u7a0b\u4e2d\u7684\u4e00\u4e2a\u6709\u7528\u6280\u5de7\u3002<\/p>\n<\/p>\n
new Thread(() -> System.out.println("\u7ebf\u7a0b\u8fd0\u884c")).start();<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u6761\u4ee3\u7801\u521b\u5efa\u5e76\u542f\u52a8\u4e86\u4e00\u4e2a\u65b0\u7ebf\u7a0b\uff0c\u5728\u8be5\u7ebf\u7a0b\u4e2d\u5b83\u6267\u884c\u4e00\u4e2a\u6253\u5370\u64cd\u4f5c\u3002\u8fd9\u8868\u660e\u4e00\u884c\u4ee3\u7801\u5c31\u80fd\u591f\u5f00\u8f9f\u65b0\u7684\u6267\u884c\u6d41\u7a0b\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9<\/h3>\n<\/p>\n
Java\u7684\u6d41\u64cd\u4f5c\u5141\u8bb8\u6211\u4eec\u5728\u4e00\u884c\u4ee3\u7801\u5185\u8bfb\u53d6\u6574\u4e2a\u6587\u4ef6\u7684\u5185\u5bb9\u3002\u8fd9\u501f\u52a9\u4e86Files<\/code>\u7c7b\u548cPaths<\/code>\u5de5\u5177\u7c7b\u5b9e\u73b0\u3002<\/p>\n<\/p>\n
String content = new String(java.nio.file.Files.readAllBytes(java.nio.file.Paths.get("path\/to\/file")));<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8be5\u4ee3\u7801\u884c\u4f7f\u7528Files.readAllBytes<\/code>\u65b9\u6cd5\uff0c\u7ed3\u5408Paths.get<\/code>\u65b9\u6cd5\u5feb\u901f\u5730\u8bfb\u53d6\u6587\u4ef6\u5e76\u8f6c\u6362\u4e3aString<\/code>\u3002\u8fd9\u9879\u529f\u80fd\u7684\u5b9e\u73b0\u4f53\u73b0\u4e86Java\u5bf9\u4e8e\u6587\u4ef6IO\u64cd\u4f5c\u7684\u4f18\u96c5\u652f\u6301\u3002<\/p>\n<\/p>\n
\u56db\u3001\u6267\u884c\u4e00\u4e2aWeb\u8bf7\u6c42<\/h3>\n<\/p>\n
\u5728Java\u4e2d\uff0c\u901a\u8fc7\u4e00\u884c\u4ee3\u7801\u5b9e\u73b0\u4e00\u4e2aHTTP\u8bf7\u6c42\uff0c\u5c55\u793a\u4e86\u5176\u5f3a\u5927\u7684\u7f51\u7edc\u7f16\u7a0b\u80fd\u529b\u3002<\/p>\n<\/p>\n
String webContent = new java.util.Scanner(new java.net.URL("http:\/\/example.com").openStream(), "UTF-8").useDelimiter("\\\\A").next();<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u6bb5\u4ee3\u7801\u4e2d\uff0c\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2aURL<\/code>\u5bf9\u8c61\uff0c\u6253\u5f00\u4e86\u4e00\u4e2a\u5230\u8be5URL\u7684\u6d41\uff0c\u5e76\u4f7f\u7528Scanner<\/code>\u8bfb\u53d6\u5168\u90e8\u5185\u5bb9\u3002\\\\A<\/code>\u4f5c\u4e3a\u5b9a\u754c\u7b26\u610f\u5473\u7740\u201c\u8bfb\u53d6\u81f3\u6587\u4ef6\u672b\u5c3e\u201d\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u53cd\u5c04\u8c03\u7528\u65b9\u6cd5<\/h3>\n<\/p>\n
Java\u7684\u53cd\u5c04API\u4f7f\u5f97\u4e00\u884c\u4ee3\u7801\u52a8\u6001\u8c03\u7528\u65b9\u6cd5\u6210\u4e3a\u53ef\u80fd\uff0c\u5c3d\u7ba1\u8fd9\u6837\u7684\u505a\u6cd5\u901a\u5e38\u4e0d\u63a8\u8350\uff0c\u56e0\u4e3a\u5b83\u727a\u7272\u4e86\u7c7b\u578b\u5b89\u5168\u548c\u6027\u80fd\u3002<\/p>\n<\/p>\n
Object result = Class.forName("java.lang.System").getMethod("currentTimeMillis").invoke(null);<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u6b64\u4ee3\u7801\u901a\u8fc7\u53cd\u5c04\u83b7\u53d6System<\/code>\u7c7b\u7684currentTimeMillis<\/code>\u65b9\u6cd5\u5e76\u8c03\u7528\u5b83\uff0c\u65e0\u9700\u76f4\u63a5\u5f15\u7528\u3002<\/p>\n<\/p>\n
\u516d\u3001\u51c6\u5907\u6b63\u5219\u8868\u8fbe\u5f0f\u5e76\u66ff\u6362\u5b57\u7b26\u4e32\u4e2d\u7684\u5185\u5bb9<\/h3>\n<\/p>\n
\u5229\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u5728Java\u4e2d\u5e38\u5e38\u53ef\u4ee5\u7528\u4e00\u884c\u4ee3\u7801\u89e3\u51b3\u590d\u6742\u7684\u5b57\u7b26\u4e32\u5904\u7406\u95ee\u9898\u3002<\/p>\n<\/p>\n
String updated = "The rAI<\/a>n in Spain falls mainly on the plain.".replaceAll("ain", "ain't");<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e0a\u9762\u7684\u4ee3\u7801\u521b\u5efa\u4e86\u4e00\u4e2a\u65b0\u5b57\u7b26\u4e32\uff0c\u5b83\u5c06\u539f\u5b57\u7b26\u4e32\u4e2d\u6240\u6709\u5339\u914d"ain"<\/code>\u7684\u5b50\u4e32\u66ff\u6362\u6210\u4e86"ain't"<\/code>\u3002\u8fd9\u662f\u7b80\u5355\u6587\u672c\u66ff\u6362\u7684\u793a\u4f8b\uff0c\u6b63\u5219\u8868\u8fbe\u5f0f\u7684\u529f\u80fd\u8fdc\u4e0d\u6b62\u4e8e\u6b64\u3002<\/p>\n<\/p>\n
\u6bcf\u4e00\u9879\u529f\u80fd\u65e0\u8bba\u591a\u4e48\u201c\u4e27\u5fc3\u75c5\u72c2\u201d\uff0c\u90fd\u6e90\u4e8eJava\u7684\u7b80\u6d01\u548c\u5f3a\u5927\uff0c\u4f7f\u5f97\u7a0b\u5e8f\u5458\u80fd\u591f\u5229\u7528\u4e00\u884c\u4ee3\u7801\u5b9e\u73b0\u975e\u5e38\u52a8\u6001\u548c\u5f3a\u5927\u7684\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
Q: \u60f3\u8bf7\u95ee\u4e00\u884c Java \u4ee3\u7801\u53ef\u4ee5\u5b9e\u73b0\u4ec0\u4e48\u75af\u72c2\u7684\u529f\u80fd\uff1f<\/strong><\/p>\n
A: \u4e00\u884c Java \u4ee3\u7801\u7684\u529f\u80fd\u53d6\u51b3\u4e8e\u4f60\u7684\u521b\u9020\u529b\u548c\u5b9e\u73b0\u76ee\u6807\u3002\u4e0b\u9762\u662f\u4e00\u4e9b\u53ef\u80fd\u7684\u4f8b\u5b50\uff1a<\/p>\n
    \n
  1. \n
    \u751f\u6210\u4e00\u4e32\u968f\u673a\u5bc6\u7801<\/strong>\uff1a\u53ef\u4ee5\u4f7f\u7528Random\u7c7b\u548c\u5b57\u7b26\u6570\u7ec4\u6765\u751f\u6210\u4e00\u884c\u4ee3\u7801\uff0c\u53ef\u4ee5\u751f\u6210\u4e00\u4e2a\u968f\u673a\u7684\u5f3a\u5bc6\u7801\uff0c\u5e76\u5c06\u5176\u6253\u5370\u51fa\u6765\u3002<\/p>\n<\/li>\n
  2. \n
    \u6253\u5f00\u4e00\u4e2a\u6307\u5b9a\u7684\u7f51\u9875<\/strong>\uff1a\u4f7f\u7528Java\u7684Desktop\u7c7b\u548cURI\u7c7b\uff0c\u53ef\u4ee5\u7f16\u5199\u4e00\u884c\u4ee3\u7801\u6765\u6253\u5f00\u4e00\u4e2a\u6307\u5b9a\u7684\u7f51\u9875\uff0c\u5e76\u5728\u9ed8\u8ba4\u6d4f\u89c8\u5668\u4e2d\u663e\u793a\u3002<\/p>\n<\/li>\n
  3. \n
    \u8fdb\u884c\u5b57\u7b26\u4e32\u53cd\u8f6c<\/strong>\uff1a\u4f7f\u7528StringBuilder\u7c7b\u7684reverse()\u65b9\u6cd5\uff0c\u53ef\u4ee5\u7f16\u5199\u4e00\u884c\u4ee3\u7801\u5c06\u4e00\u4e2a\u5b57\u7b26\u4e32\u8fdb\u884c\u53cd\u8f6c\uff0c\u5e76\u5c06\u7ed3\u679c\u6253\u5370\u51fa\u6765\u3002<\/p>\n<\/li>\n<\/ol>\n
    \u8bf7\u8bb0\u4f4f\uff0c\u8fd9\u4e9b\u4f8b\u5b50\u53ea\u662f\u5c55\u793a\u4e86\u4e00\u884cJava\u4ee3\u7801\u7684\u6f5c\u529b\u3002\u771f\u6b63\u6709\u8da3\u548c\u4e30\u5bcc\u591a\u5f69\u7684\u529f\u80fd\u5c06\u53d6\u51b3\u4e8e\u60a8\u7684\u9879\u76ee\u9700\u6c42\u548c\u4e2a\u4eba\u521b\u9020\u529b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u4e00\u884cJava\u4ee3\u7801\uff08\u4ee5\u5206\u53f7\u7ed3\u675f\uff09\u80fd\u5b9e\u73b0\u7684\u4e27\u5fc3\u75c5\u72c2\u7684\u529f\u80fd\u5305\u62ec\uff1a\u521b\u5efa\u4e00\u4e2a\u533f\u540d\u5185\u90e8\u7c7b\u3001\u542f\u52a8\u4e00\u4e2a\u7ebf\u7a0b\u3001\u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9\u3001\u6267\u884c […]","protected":false},"author":3,"featured_media":227833,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/227824"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=227824"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/227824\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/227833"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=227824"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=227824"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=227824"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}