{"id":202831,"date":"2025-05-22T10:41:16","date_gmt":"2025-05-22T02:41:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202831\/"},"modified":"2025-05-22T10:41:16","modified_gmt":"2025-05-22T02:41:16","slug":"try-with-resources-%e8%af%ad%e5%8f%a5%e5%a6%82%e4%bd%95%e7%ae%80%e5%8c%96-java-%e4%b8%ad%e7%9a%84%e5%bc%82%e5%b8%b8%e5%a4%84%e7%90%86%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202831\/","title":{"rendered":"try-with-resources \u8bed\u53e5\u5982\u4f55\u7b80\u5316 Java \u4e2d\u7684\u5f02\u5e38\u5904\u7406\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

try-with-resources \u8bed\u53e5\u5982\u4f55\u7b80\u5316 Java \u4e2d\u7684\u5f02\u5e38\u5904\u7406\uff1f<\/h1>\n

\u4ece\u73b0\u5728\u5f00\u59cb\uff0c\u6211\u4eec\u8981\u52aa\u529b\u5b66\u4e60\u5566\uff01\u4eca\u5929\u6211\u7ed9\u5927\u5bb6\u5e26\u6765\u300atry-with-resources \u8bed\u53e5\u5982\u4f55\u7b80\u5316 Java \u4e2d\u7684\u5f02\u5e38\u5904\u7406\uff1f\u300b<\/span>\uff0c\u611f\u5174\u8da3\u7684\u670b\u53cb\u8bf7\u7ee7\u7eed\u770b\u4e0b\u53bb\u5427\uff01\u4e0b\u6587\u4e2d\u7684\u5185\u5bb9\u6211\u4eec\u4e3b\u8981\u4f1a\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u5728\u9605\u8bfb\u672c\u6587\u8fc7\u7a0b\u4e2d\u6709\u9047\u5230\u4e0d\u6e05\u695a\u7684\u5730\u65b9\uff0c\u6b22\u8fce\u7559\u8a00\u5440\uff01\u6211\u4eec\u4e00\u8d77\u8ba8\u8bba\uff0c\u4e00\u8d77\u5b66\u4e60\uff01<\/p>\n

try-with-resources \u8bed\u53e5\u5728 Java \u4e2d\u7b80\u5316\u4e86\u5f02\u5e38\u5904\u7406\uff0c\u81ea\u52a8\u5173\u95ed\u8d44\u6e90\uff0c\u4f8b\u5982\u6587\u4ef6\u3001\u6570\u636e\u5e93\u8fde\u63a5\u548c\u7f51\u7edc\u8fde\u63a5\u3002\u8be5\u8bed\u53e5\u5177\u6709\u4ee5\u4e0b\u4f18\u70b9\uff1a\u8bed\u6cd5\u7b80\u6d01\u3001\u81ea\u52a8\u5173\u95ed\u8d44\u6e90\u3001\u63d0\u9ad8\u4ee3\u7801\u53ef\u8bfb\u6027\u548c\u7ef4\u62a4\u6027\u3002\u5b9e\u6218\u6848\u4f8b\u5305\u62ec\u4f7f\u7528 try-with-resources \u8bfb\u5199\u6587\u4ef6\u548c\u8bbf\u95ee\u6570\u636e\u5e93\u3002<\/p>\n

<\/p>\n

\u4f7f\u7528 try-with-resources \u8bed\u53e5\u7b80\u5316 Java \u4e2d\u7684\u5f02\u5e38\u5904\u7406<\/strong><\/p>\n

\u7b80\u4ecb<\/strong><\/p>\n

Java \u4e2d\u7684 try-with-resources \u8bed\u53e5\u662f\u4e00\u79cd\u7b80\u5316\u7684\u5f02\u5e38\u5904\u7406\u673a\u5236\uff0c\u53ef\u4ee5\u81ea\u52a8\u5173\u95ed\u8d44\u6e90\uff0c\u4f8b\u5982\u6587\u4ef6\u3001\u6570\u636e\u5e93\u8fde\u63a5\u6216\u7f51\u7edc\u8fde\u63a5\u3002\u8fd9\u6d88\u9664\u4e86\u624b\u52a8\u5173\u95ed\u8d44\u6e90\u7684\u9700\u8981\uff0c\u4ece\u800c\u51cf\u5c11\u4e86\u9519\u8bef\u548c\u4ee3\u7801\u91cd\u590d\u3002<\/p>\n

\u8bed\u6cd5<\/strong><\/p>\n

try (\u8d44\u6e90\u58f0\u660e1; \u8d44\u6e90\u58f0\u660e2; ...) {\n  \/\/ \u4ee3\u7801\u5757\n}<\/pre>\n
\u8d44\u6e90\u58f0\u660e<\/strong><\/p>\n
\u8d44\u6e90\u58f0\u660e\u6307\u5b9a\u8981\u7ba1\u7406\u7684\u8d44\u6e90\uff0c\u5e76\u4e14\u53ef\u4ee5\u662f\u4efb\u4f55\u5b9e\u73b0\u4e86 java.lang.AutoCloseable \u6216 java.io.Closeable \u7684\u7c7b\u578b\u3002\u8981\u5173\u95ed\u8d44\u6e90\uff0c\u53ea\u9700\u4f7f\u7528\u4ee5\u4e0b\u5f62\u5f0f\u8fdb\u884c\u58f0\u660e\uff1a<\/p>\n
try (AutoCloseable \u8d44\u6e90 = new AutoCloseableImpl()) {\n  \/\/ \u4ee3\u7801\u5757\n}<\/pre>\n
\u81ea\u52a8\u5173\u95ed<\/strong><\/p>\n
\u5728 try \u4ee3\u7801\u5757\u6267\u884c\u540e\u6216\u629b\u51fa\u5f02\u5e38\u65f6\uff0c\u7f16\u8bd1\u5668\u4f1a\u81ea\u52a8\u8c03\u7528\u6bcf\u4e2a\u8d44\u6e90\u7684 close() \u65b9\u6cd5\u3002\u8fd9\u786e\u4fdd\u4e86\u5373\u4f7f\u5728\u5f02\u5e38\u60c5\u51b5\u4e0b\uff0c\u8d44\u6e90\u4e5f\u4f1a\u88ab\u6b63\u786e\u5173\u95ed\u3002<\/p>\n
\u5b9e\u6218\u6848\u4f8b<\/strong><\/p>\n
\u4f7f\u7528 try-with-resources \u8bfb\u5199\u6587\u4ef6<\/strong><\/p>\n
try (BufferedReader reader = new BufferedReader(new FileReader(\"input.txt\"));\n     BufferedWriter writer = new BufferedWriter(new FileWriter(\"output.txt\"))) {\n  \/\/ \u8bfb\u53d6\u8f93\u5165\u6587\u4ef6\u5e76\u5199\u5165\u8f93\u51fa\u6587\u4ef6\n}<\/pre>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u5373\u4f7f\u53d1\u751f\u5f02\u5e38\uff0creader \u548c writer \u8d44\u6e90\u4e5f\u4f1a\u88ab\u5173\u95ed\uff0c\u786e\u4fdd\u6587\u4ef6\u6b63\u786e\u5904\u7406\u3002<\/p>\n
\u4f7f\u7528 try-with-resources \u8bbf\u95ee\u6570\u636e\u5e93<\/strong><\/p>\n
try (Connection connection = DriverManager.getConnection(\"jdbc:mysql:\/\/localhost:3306\/database\");\n     Statement statement = connection.createStatement()) {\n  \/\/ \u6267\u884c SQL \u67e5\u8be2\u6216\u66f4\u65b0\n}<\/pre>\n
\u5728\u6b64\u793a\u4f8b\u4e2d\uff0cconnection \u548c statement \u8d44\u6e90\u5c06\u81ea\u52a8\u5173\u95ed\uff0c\u786e\u4fdd\u6570\u636e\u5e93\u8fde\u63a5\u6b63\u786e\u91ca\u653e\u3002<\/p>\n
\u4f18\u70b9<\/strong><\/p>\n
try-with-resources \u8bed\u53e5\u63d0\u4f9b\u4e86\u4ee5\u4e0b\u4f18\u70b9\uff1a<\/p>\n
    \n
  • \u51cf\u5c11\u5f02\u5e38\u5904\u7406\u4ee3\u7801\u7684\u91cd\u590d<\/li>\n
  • \u786e\u4fdd\u8d44\u6e90\u59cb\u7ec8\u6b63\u786e\u5173\u95ed<\/li>\n
  • \u63d0\u9ad8\u4ee3\u7801\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027<\/li>\n<\/ul>\n
    \u7ed3\u8bba<\/strong><\/p>\n
    try-with-resources \u8bed\u53e5\u662f Java \u4e2d\u5f02\u5e38\u5904\u7406\u7684\u5b9d\u8d35\u5de5\u5177\uff0c\u5b83\u7b80\u5316\u4e86\u8d44\u6e90\u7ba1\u7406\u5e76\u63d0\u9ad8\u4e86\u4ee3\u7801\u8d28\u91cf\u3002\u901a\u8fc7\u4e86\u89e3\u5176\u8bed\u6cd5\u548c\u5b9e\u6218\u6848\u4f8b\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u4f7f\u7528 try-with-resources \u6765\u7f16\u5199\u6a21\u5757\u5316\u3001\u53ef\u9760\u4e14\u53ef\u6269\u5c55\u7684 Java \u7a0b\u5e8f\u3002<\/p>\n
    \u672c\u7bc7\u5173\u4e8e\u300atry-with-resources \u8bed\u53e5\u5982\u4f55\u7b80\u5316 Java \u4e2d\u7684\u5f02\u5e38\u5904\u7406\uff1f\u300b\u7684\u4ecb\u7ecd\u5c31\u5230\u6b64\u7ed3\u675f\u5566\uff0c\u4f46\u662f\u5b66\u65e0\u6b62\u5883\uff0c\u60f3\u8981\u4e86\u89e3\u5b66\u4e60\u66f4\u591a\u5173\u4e8e\u6587\u7ae0\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
    try-with-resourc...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-202831","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202831","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=202831"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202831\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202831"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202831"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202831"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}