{"id":300005,"date":"2024-05-20T17:31:38","date_gmt":"2024-05-20T09:31:38","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/300005.html"},"modified":"2024-05-20T17:31:49","modified_gmt":"2024-05-20T09:31:49","slug":"java%e4%b8%ad%e7%bd%91%e7%bb%9curl%e5%a6%82%e4%bd%95%e7%9b%b4%e6%8e%a5%e8%bd%ac%e6%8d%a2%e4%b8%bafile","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/300005.html","title":{"rendered":"Java\u4e2d\u7f51\u7edcURL\u5982\u4f55\u76f4\u63a5\u8f6c\u6362\u4e3aFile"},"content":{"rendered":"

\"Java\u4e2d\u7f51\u7edcURL\u5982\u4f55\u76f4\u63a5\u8f6c\u6362\u4e3aFile\"<\/p>\n

Java\u4e2d\u7f51\u7edcURL\u76f4\u63a5\u8f6c\u6362\u4e3aFile\u4e0d\u662f\u4e00\u4e2a\u6807\u51c6\u7684\u64cd\u4f5c\uff0c\u56e0\u4e3aURL\u901a\u5e38\u6307\u7684\u662f\u4e00\u4e2a\u7f51\u7edc\u4e0a\u7684\u8d44\u6e90\uff0c\u800cFile\u5bf9\u8c61\u4ee3\u8868\u7684\u662f\u672c\u5730\u6587\u4ef6\u7cfb\u7edf\u7684\u4e00\u4e2a\u6587\u4ef6\u6216\u76ee\u5f55\u3002\u5982\u679c\u4f60\u9700\u8981\u5c06\u4e00\u4e2aURL\u6307\u5411\u7684\u8d44\u6e90\u4fdd\u5b58\u4e3a\u4e00\u4e2a\u672c\u5730\u7684File\u5bf9\u8c61\uff0c\u901a\u5e38\u7684\u505a\u6cd5\u662f\u5148\u901a\u8fc7\u7f51\u7edc\u4e0b\u8f7dURL\u6307\u5411\u7684\u5185\u5bb9\u3001\u7136\u540e\u5c06\u4e0b\u8f7d\u7684\u5185\u5bb9\u4fdd\u5b58\u5230\u672c\u5730\u6587\u4ef6\u7cfb\u7edf\u4e2d<\/strong>\u3002\u5bf9\u4e8e\u8fd9\u4e00\u8fc7\u7a0b\uff0c\u53ef\u4ee5\u4f7f\u7528Java\u5185\u7f6e\u7684\u7c7b\u5e93\u5982java.net.URL<\/code>\u548cjava.io<\/code>\u5305\u4e2d\u7684\u7c7b\u6765\u5b9e\u73b0\u3002<\/p>\n<\/p>\n

\u4e00\u3001URL\u5230File\u7684\u8f6c\u6362\u6d41\u7a0b<\/h3>\n<\/p>\n

\u521b\u5efa\u548c\u914d\u7f6eURL\u5bf9\u8c61<\/h4>\n<\/p>\n

\u9996\u5148\uff0c\u4f60\u9700\u8981\u521b\u5efa\u4e00\u4e2aURL\u5bf9\u8c61\u6765\u6307\u5b9a\u60f3\u8981\u4e0b\u8f7d\u7684\u8d44\u6e90\u3002\u901a\u8fc7new URL(String spec)<\/code>\u6784\u9020\u65b9\u6cd5\u6765\u521b\u5efa\u4e00\u4e2a\u65b0\u7684URL\u5bf9\u8c61\u3002<\/p>\n<\/p>\n

URL url = new URL("http:\/\/www.example.com\/resource.txt");<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5efa\u7acb\u8fde\u63a5\u83b7\u53d6\u8f93\u5165\u6d41<\/h4>\n<\/p>\n
\u4f7f\u7528URL\u5bf9\u8c61\u7684openConnection()<\/code>\u65b9\u6cd5\u6765\u521b\u5efa\u4e00\u4e2aURLConnection\u5bf9\u8c61\uff0c\u5e76\u901a\u8fc7\u5b83\u83b7\u5f97\u8f93\u5165\u6d41\u3002<\/p>\n<\/p>\n
URLConnection connection = url.openConnection();<\/p>\n
InputStream inputStream = connection.getInputStream();<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u521b\u5efaFile\u5e76\u8f93\u51fa\u5185\u5bb9<\/h4>\n<\/p>\n
\u7136\u540e\u786e\u5b9a\u8981\u4fdd\u5b58\u6587\u4ef6\u7684\u672c\u5730\u8def\u5f84\uff0c\u5e76\u521b\u5efaFile\u5bf9\u8c61\u3002\u4f7f\u7528\u8f93\u5165\u6d41\u548c\u8f93\u51fa\u6d41\uff0c\u5c06\u7f51\u7edc\u8d44\u6e90\u7684\u5185\u5bb9\u8bfb\u53d6\u51fa\u6765\u5e76\u5199\u5165\u5230\u672c\u5730\u6587\u4ef6\u4e2d\u3002<\/p>\n<\/p>\n
File file = new File("\/path\/to\/your\/local\/file.txt");<\/p>\n
FileOutputStream outputStream = new FileOutputStream(file);<\/p>\n
byte[] buffer = new byte[1024];<\/p>\n
int bytesRead;<\/p>\n
while ((bytesRead = inputStream.read(buffer)) != -1) {<\/p>\n
    outputStream.write(buffer, 0, bytesRead);<\/p>\n
}<\/p>\n
outputStream.close();<\/p>\n
inputStream.close();<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u6ce8\u610f<\/strong>: \u8fd9\u4e2a\u8fc7\u7a0b\u6d89\u53ca\u7f51\u7edcIO\u548c\u672c\u5730IO\uff0c\u5e94\u5f53\u5728\u9002\u5f53\u7684\u4f4d\u7f6e\u5904\u7406IOException\uff0c\u5e76\u4e14\u786e\u4fdd\u6d41\u5728\u4f7f\u7528\u7ed3\u675f\u540e\u88ab\u6b63\u786e\u5173\u95ed\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4ece\u7f51\u7edc\u4e0b\u8f7d\u6587\u4ef6\u7684\u8be6\u7ec6\u6b65\u9aa4<\/h3>\n<\/p>\n
\u5efa\u7acb\u7f51\u7edc\u8fde\u63a5<\/h4>\n<\/p>\n
\u5efa\u7acb\u7f51\u7edc\u8fde\u63a5\u662f\u83b7\u53d6\u7f51\u7edc\u8d44\u6e90\u5185\u5bb9\u7684\u9996\u8981\u6b65\u9aa4\u3002Java\u4e2d\u7684URLConnection<\/code>\u7c7b\u4ee3\u8868\u4e86\u5e94\u7528\u7a0b\u5e8f\u548cURL\u4e4b\u95f4\u7684\u901a\u4fe1\u94fe\u63a5\u3002\u901a\u8fc7URL\u7684openConnection()<\/code>\u65b9\u6cd5\u53ef\u4ee5\u83b7\u5f97URLConnection\u5bf9\u8c61\uff0c\u5e76\u901a\u8fc7\u8c03\u7528\u5176connect()<\/code>\u65b9\u6cd5\u5efa\u7acb\u5b9e\u9645\u7684\u8fde\u63a5\u3002<\/p>\n<\/p>\n
\u8bfb\u53d6\u6570\u636e<\/h4>\n<\/p>\n
\u4eceURLConnection\u5bf9\u8c61\u83b7\u53d6\u8f93\u5165\u6d41\u540e\uff0c\u7a0b\u5e8f\u5c31\u53ef\u4ee5\u5f00\u59cb\u8bfb\u53d6URL\u6240\u6307\u5411\u7684\u8d44\u6e90\u4e86\u3002\u8fd9\u65f6\uff0c\u901a\u5e38\u4f1a\u4f7f\u7528\u7f13\u51b2\u533a\u6765\u9010\u6bb5\u8bfb\u53d6\u6570\u636e\uff0c\u8fd9\u53ef\u4ee5\u901a\u8fc7\u521b\u5efa\u5b57\u8282\u6570\u7ec4\u4f5c\u4e3a\u7f13\u51b2\u6765\u5b9e\u73b0\u3002<\/p>\n<\/p>\n
\u5199\u5165\u672c\u5730\u6587\u4ef6<\/h4>\n<\/p>\n
\u8bfb\u53d6\u6570\u636e\u7684\u540c\u65f6\uff0c\u7a0b\u5e8f\u5e94\u5f53\u6253\u5f00\u4e00\u4e2a\u5230\u672c\u5730\u6587\u4ef6\u7684FileOutputStream\uff0c\u5e76\u5c06\u8bfb\u53d6\u5230\u7684\u6570\u636e\u5199\u5165\u8be5\u6587\u4ef6\u3002\u8fd9\u91cc\u8981\u6ce8\u610f\u4f7f\u7528\u5408\u9002\u7684\u7f13\u51b2\u5927\u5c0f\u4ee5\u53ca\u6b63\u786e\u5904\u7406\u6d41\u7684\u5173\u95ed\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u9519\u8bef\u5904\u7406\u548c\u8d44\u6e90\u7ba1\u7406<\/a><\/h3>\n<\/p>\n
\u5f53\u5904\u7406\u7f51\u7edc\u548c\u6587\u4ef6\u7cfb\u7edf\u7684IO\u64cd\u4f5c\u65f6\uff0c\u603b\u4f1a\u6709\u5931\u8d25\u7684\u53ef\u80fd\uff0c\u6bd4\u5982\u7f51\u7edc\u95ee\u9898\u3001\u6587\u4ef6\u4e0d\u5b58\u5728\u7b49\u3002\u56e0\u6b64\uff0c\u9700\u8981\u5408\u7406\u5730\u6355\u83b7\u548c\u5904\u7406\u8fd9\u4e9b\u5f02\u5e38\u3002<\/p>\n<\/p>\n
\u5f02\u5e38\u5904\u7406<\/h4>\n<\/p>\n
\u4f7f\u7528try-catch\u5757\u6765\u6355\u83b7\u53ef\u80fd\u51fa\u73b0\u7684IOException<\/code>\uff0c\u5e76\u4f5c\u51fa\u76f8\u5e94\u5904\u7406\u3002\u5982\u679c\u6ca1\u6709\u6b63\u786e\u5904\u7406\u8fd9\u4e9b\u5f02\u5e38\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u7a0b\u5e8f\u5f02\u5e38\u7ec8\u6b62\u6216\u8d44\u6e90\u6cc4\u9732\u3002<\/p>\n<\/p>\n
\u8d44\u6e90\u5173\u95ed<\/h4>\n<\/p>\n
Java 7\u5f15\u5165\u7684try-with-resources\u8bed\u53e5\u53ef\u4ee5\u81ea\u52a8\u5173\u95ed\u5b9e\u73b0\u4e86AutoCloseable<\/code>\u63a5\u53e3\u7684\u8d44\u6e90\u3002\u4f7f\u7528\u8fd9\u4e2a\u8bed\u53e5\u53ef\u4ee5\u7b80\u5316\u4ee3\u7801\uff0c\u4fdd\u8bc1\u5373\u4fbf\u5728\u53d1\u751f\u5f02\u5e38\u7684\u60c5\u51b5\u4e0b\uff0c\u8d44\u6e90\u4e5f\u80fd\u88ab\u6b63\u786e\u5173\u95ed\u3002<\/p>\n<\/p>\n
\u56db\u3001\u4f18\u5316\u548c\u6ce8\u610f\u4e8b\u9879<\/h3>\n<\/p>\n
\u867d\u7136\u5c06URL\u76f4\u63a5\u8f6c\u6362\u4e3aFile\u4e0d\u662f\u4e00\u9879\u5efa\u8bae\u64cd\u4f5c\uff0c\u4f46\u5b8c\u6210\u4eceURL\u4e0b\u8f7d\u6587\u4ef6\u5230\u672c\u5730\u7684\u8fc7\u7a0b\u8fd8\u6709\u4f18\u5316\u7684\u7a7a\u95f4\u3002<\/p>\n<\/p>\n
\u4f7f\u7528\u7f13\u5b58<\/h4>\n<\/p>\n
\u5728\u9891\u7e41\u64cd\u4f5c\u7f51\u7edc\u8d44\u6e90\u65f6\uff0c\u4f7f\u7528\u672c\u5730\u7f13\u5b58\u53ef\u4ee5\u51cf\u5c11\u7f51\u7edc\u5ef6\u8fdf\u548c\u4e0d\u5fc5\u8981\u7684\u6570\u636e\u4f20\u8f93\uff0c\u63d0\u9ad8\u7a0b\u5e8f\u6027\u80fd\u3002<\/p>\n<\/p>\n
\u591a\u7ebf\u7a0b\u4e0b\u8f7d<\/h4>\n<\/p>\n
\u5bf9\u4e8e\u5927\u6587\u4ef6\u7684\u4e0b\u8f7d\uff0c\u53ef\u4ee5\u8003\u8651\u4f7f\u7528\u591a\u7ebf\u7a0b\u4e0b\u8f7d\u4ee5\u63d0\u9ad8\u6548\u7387\u3002\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u4f60\u53ef\u4ee5\u5c06\u6587\u4ef6\u5206\u6210\u591a\u4e2a\u90e8\u5206\uff0c\u7531\u591a\u4e2a\u7ebf\u7a0b\u5206\u522b\u4e0b\u8f7d\u4e0d\u540c\u7684\u90e8\u5206\uff0c\u6700\u540e\u5408\u5e76\u8fd9\u4e9b\u90e8\u5206\u3002<\/p>\n<\/p>\n
\u7f51\u7edc\u73af\u5883\u8003\u91cf<\/h4>\n<\/p>\n
\u7f16\u5199\u4e0b\u8f7d\u4ee3\u7801\u65f6\uff0c\u9700\u8003\u8651\u5230\u4e0d\u540c\u7684\u7f51\u7edc\u73af\u5883\uff0c\u6bd4\u5982\u4ee3\u7406\u8bbe\u7f6e\u3001\u9632\u706b\u5899\u9650\u5236\u7b49\uff0c\u786e\u4fdd\u4ee3\u7801\u5728\u4e0d\u540c\u73af\u5883\u4e0b\u90fd\u80fd\u6b63\u5e38\u5de5\u4f5c\u3002<\/p>\n<\/p>\n
\u901a\u8fc7\u4e0a\u8ff0\u6b65\u9aa4\u548c\u6ce8\u610f\u4e8b\u9879\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u4ece\u7f51\u7edcURL\u4e0b\u8f7d\u8d44\u6e90\u5e76\u4fdd\u5b58\u4e3a\u672c\u5730\u6587\u4ef6\u3002\u5c3d\u7ba1\u8fd9\u4e2a\u64cd\u4f5c\u4e0d\u662f\u76f4\u63a5\u7684\u8f6c\u6362\uff0c\u4f46\u8fd9\u662f\u5728\u73b0\u6709Java API\u4e2d\u4ece\u7f51\u7edcURL\u83b7\u53d6\u6587\u4ef6\u5185\u5bb9\u7684\u53ef\u884c\u65b9\u6cd5\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
\u95ee\u98981\uff1a<\/strong>Java\u4e2d\u7f51\u7edcURL\u5982\u4f55\u8f6c\u6362\u4e3a\u672c\u5730File\u5bf9\u8c61\u5462\uff1f<\/p>\n
\u7b54\uff1a\u5728Java\u4e2d\uff0c\u5c06\u7f51\u7edcURL\u76f4\u63a5\u8f6c\u6362\u4e3a\u672c\u5730File\u5bf9\u8c61\u7684\u65b9\u6cd5\u662f\u901a\u8fc7URL\u7c7b\u548cFile\u7c7b\u7684\u76f8\u4e92\u8f6c\u6362\u5b9e\u73b0\u7684\u3002\u9996\u5148\uff0c\u901a\u8fc7URL\u7c7b\u7684openConnection()<\/code>\u65b9\u6cd5\u521b\u5efaURLConnection\u5bf9\u8c61\uff0c\u7136\u540e\u901a\u8fc7\u8c03\u7528getInputStream()<\/code>\u65b9\u6cd5\u83b7\u53d6\u7f51\u7edcURL\u7684\u8f93\u5165\u6d41\u3002\u63a5\u7740\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7IO\u6d41\u5c06\u7f51\u7edc\u5185\u5bb9\u4fdd\u5b58\u5230\u672c\u5730\u4e34\u65f6\u6587\u4ef6\u4e2d\uff0c\u6700\u540e\u4f7f\u7528File\u7c7b\u7684\u6784\u9020\u51fd\u6570\u5c06\u4e34\u65f6\u6587\u4ef6\u8def\u5f84\u8f6c\u6362\u4e3aFile\u5bf9\u8c61\u3002\u8fd9\u6837\uff0c\u6211\u4eec\u5c31\u6210\u529f\u5c06\u7f51\u7edcURL\u8f6c\u6362\u4e3a\u672c\u5730File\u5bf9\u8c61\u4e86\u3002<\/p>\n
\u95ee\u98982\uff1a<\/strong>\u5982\u4f55\u5728Java\u4e2d\u5c06\u7f51\u7edcURL\u8f6c\u6362\u4e3a\u672c\u5730\u6587\u4ef6\u8def\u5f84\uff1f<\/p>\n
\u7b54\uff1a\u8981\u5c06\u7f51\u7edcURL\u8f6c\u6362\u4e3a\u672c\u5730\u6587\u4ef6\u8def\u5f84\uff0c\u53ef\u4ee5\u9996\u5148\u901a\u8fc7URL\u7c7b\u7684\u6784\u9020\u51fd\u6570\u5c06URL\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3aURL\u5bf9\u8c61\u3002\u7136\u540e\uff0c\u53ef\u4ee5\u901a\u8fc7URL\u5bf9\u8c61\u7684getPath()<\/code>\u65b9\u6cd5\u83b7\u53d6URL\u7684\u8def\u5f84\u90e8\u5206\u3002\u63a5\u7740\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528File.separator<\/code>\u5c5e\u6027\u4f5c\u4e3a\u5206\u9694\u7b26\uff0c\u5c06URL\u8def\u5f84\u4e2d\u7684\u659c\u6760\u66ff\u6362\u4e3a\u672c\u5730\u64cd\u4f5c\u7cfb\u7edf\u7684\u6587\u4ef6\u5206\u9694\u7b26\u3002\u6700\u540e\uff0c\u6211\u4eec\u5f97\u5230\u4e86\u672c\u5730\u6587\u4ef6\u7684\u8def\u5f84\u3002\u53e6\u5916\uff0c\u8fd8\u53ef\u4ee5\u901a\u8fc7URL\u5bf9\u8c61\u7684getFile()<\/code>\u65b9\u6cd5\u83b7\u53d6URL\u8def\u5f84\u7684\u5b8c\u6574\u5b57\u7b26\u4e32\uff0c\u7136\u540e\u5229\u7528File\u7c7b\u7684\u6784\u9020\u51fd\u6570\u5c06\u5176\u8f6c\u6362\u4e3a\u672c\u5730File\u5bf9\u8c61\u3002<\/p>\n
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