{"id":11840,"date":"2023-01-03T17:22:58","date_gmt":"2023-01-03T09:22:58","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=11840"},"modified":"2023-01-03T17:23:00","modified_gmt":"2023-01-03T09:23:00","slug":"java%e4%b8%ad%e5%ad%97%e8%8a%82%e6%b5%81%e7%9a%84%e5%88%86%e7%b1%bb%e9%83%bd%e6%9c%89%e5%93%aa%e4%ba%9b","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/11840.html","title":{"rendered":"java\u4e2d\u5b57\u8282\u6d41\u7684\u5206\u7c7b\u90fd\u6709\u54ea\u4e9b"},"content":{"rendered":"\n
\n

java\u4e2d\u5b57\u8282\u6d41\u7684\u5206\u7c7b\u6709\uff1a1. \u57fa\u7c7b\u6d41\uff1b2. \u6587\u4ef6\u5b57\u8282\u6d41\uff1b3. \u52a8\u6001\u5b57\u8282\u6570\u7ec4\u6d41\uff1b4. \u88c5\u9970\u8005\u5b57\u8282\u6d41\uff1b5. \u7f13\u51b2\u6d41\u3002\u5176\u4e2d\uff0cInputStream\u662f\u4e00\u4e2a\u8f93\u5165\u6d41\uff0c\u4e5f\u5c31\u662f\u7528\u6765\u8bfb\u53d6\u6587\u4ef6\u7684\u6d41\uff0c\u62bd\u8c61\u65b9\u6cd5read\u8bfb\u53d6\u4e0b\u4e00\u4e2a\u5b57\u8282\uff0c\u5f53\u8bfb\u53d6\u5230\u6587\u4ef6\u7684\u672b\u5c3e\u65f6\u5019\u8fd4\u56de -1\u3002<\/p>\n<\/blockquote>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

\u4e00\u3001java\u4e2d\u5b57\u8282\u6d41\u7684\u5206\u7c7b<\/strong><\/h2>\n\n\n\n

1. <\/strong>\u57fa\u7c7b\u6d41<\/strong><\/h3>\n\n\n\n

InputStream\u662f\u4e00\u4e2a\u8f93\u5165\u6d41\uff0c\u4e5f\u5c31\u662f\u7528\u6765\u8bfb\u53d6\u6587\u4ef6\u7684\u6d41\uff0c\u62bd\u8c61\u65b9\u6cd5read\u8bfb\u53d6\u4e0b\u4e00\u4e2a\u5b57\u8282\uff0c\u5f53\u8bfb\u53d6\u5230\u6587\u4ef6\u7684\u672b\u5c3e\u65f6\u5019\u8fd4\u56de -1\u3002\u5982\u679c\u6d41\u4e2d\u6ca1\u6709\u6570\u636eread\u5c31\u4f1a\u963b\u585e\u76f4\u81f3\u6570\u636e\u5230\u6765\u6216\u8005\u5f02\u5e38\u51fa\u73b0\u6216\u8005\u6d41\u5173\u95ed\u3002\u8fd9\u662f\u4e00\u4e2a\u53d7\u67e5\u5f02\u5e38\uff0c\u5177\u4f53\u7684\u8c03\u7528\u8005\u5fc5\u987b\u5904\u7406\u5f02\u5e38\u3002\u9664\u4e86\u4e00\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\uff0cInputStream\u4e2d\u8fd8\u63d0\u4f9b\u4e86read(byte[])\uff0c\u8bfb\u53d6\u591a\u4e2a\u5b57\u8282\u3002read(byte[])\u5176\u5b9e\u9ed8\u8ba4\u8c03\u7528\u7684\u8fd8\u662fread(byte b[], int off, int len)\u65b9\u6cd5\uff0c\u8868\u793a\u6bcf\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\u5c31\u653e\u5728b[off++]\u4e2d\uff0c\u603b\u5171\u8bfb\u53d6len\u4e2a\u5b57\u8282\uff0c\u4f46\u662f\u5f80\u5f80\u4f1a\u51fa\u73b0\u6d41\u4e2d\u5b57\u8282\u6570\u5c0f\u4e8elen\uff0c\u6240\u4ee5\u8fd4\u56de\u7684\u662f\u5b9e\u9645\u8bfb\u53d6\u5230\u7684\u5b57\u8282\u6570\u3002<\/p>\n\n\n\n

OutputStream\u662f\u4e00\u79cd\u8f93\u51fa\u6d41\uff0c\u5177\u4f53\u7684\u65b9\u6cd5\u548cInputStream\u5dee\u4e0d\u591a\uff0c\u53ea\u662f\uff0c\u4e00\u4e2a\u8bfb\u4e00\u4e2a\u5199\u3002\u4f46\u662f\uff0c\u4ed6\u4eec\u90fd\u662f\u62bd\u8c61\u7c7b\uff0c\u60f3\u8981\u5b9e\u73b0\u5177\u4f53\u7684\u529f\u80fd\u8fd8\u662f\u9700\u8981\u4f9d\u8d56\u4ed6\u4eec\u7684\u5b50\u7c7b\u6765\u5b9e\u73b0\uff0c\u4f8b\u5982\uff1aFileInputStream\/FileOutputStream\u7b49\u3002<\/p>\n\n\n\n

2. <\/strong>\u6587\u4ef6\u5b57\u8282\u6d41<\/strong><\/h3>\n\n\n\n

FileInputStream\u7ee7\u627f\u4e0eInputStream\uff0c\u4e3b\u8981\u6709\u4ee5\u4e0b\u4e24\u4e2a\u6784\u9020\u65b9\u6cd5\uff1a<\/p>\n\n\n\n

\u540d\u5217\u524d\u8305\u79cd\u6784\u9020\u65b9\u6cd5\u4f20\u7684\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u5b9e\u9645\u4e0a\u662f\u4e00\u4e2a\u786e\u5b9a\u6587\u4ef6\u7684\u8def\u5f84\uff0c\u5185\u90e8\u5c06\u6b64\u8def\u5f84\u5c01\u88c5\u6210File\u7c7b\u578b\uff0c\u8c03\u7528\u7b2c\u4e8c\u79cd\u6784\u9020\u65b9\u6cd5\u3002\u7b2c\u4e8c\u4e2d\u6784\u9020\u65b9\u6cd5\uff0c\u76f4\u63a5\u7ed1\u5b9a\u7684\u662f\u4e00\u4e2a\u5177\u4f53\u7684\u6587\u4ef6\u3002FileOutputStream\u7684\u4e00\u4e9b\u57fa\u672c\u7684\u64cd\u4f5c\u548cFileInputStream\u7c7b\u4f3c\uff0c\u53ea\u662f\u4e00\u4e2a\u662f\u8bfb\u4e00\u4e2a\u662f\u5199\u3002\u6211\u4eec\u4e3b\u8981\u8981\u77e5\u9053\uff0cappend\u5c5e\u6027\u662f\u6307\u5b9a\u5bf9\u4e8e\u6587\u4ef6\u7684\u64cd\u4f5c\u662f\u8986\u76d6\u65b9\u5f0f\uff08false\uff09\uff0c\u8fd8\u662f\u8ffd\u52a0\u65b9\u5f0f\uff08true\uff09\u3002<\/p>\n\n\n\n

3. <\/strong>\u52a8\u6001\u5b57\u8282\u6570\u7ec4\u6d41<\/strong><\/h3>\n\n\n\n

ByteArrayInputStream\u5185\u90e8\u5b9a\u4e49\u4e86\u4e00\u4e2abuf\u6570\u7ec4\u548c\u8bb0\u5f55\u6570\u7ec4\u4e2d\u5b9e\u9645\u7684\u5b57\u8282\u6570\uff0cread\u65b9\u6cd5\u4e5f\u5f88\u7b80\u5355\uff0c\u8bfb\u53d6\u4e0b\u4e00\u4e2a\u5b57\u8282\uff0cread(byte b[], int off, int len) \u5c06\u5185\u7f6e\u5b57\u8282\u6570\u7ec4\u8bfb\u5165\u76ee\u6807\u6570\u7ec4\u3002\u5b9e\u9645\u4e0a\uff0c\u6574\u4e2aByteArrayInputStream\u4e5f\u5c31\u662f\u5c06\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u5c01\u88c5\u5728\u5176\u5185\u90e8\u3002\u4e3a\u4ec0\u4e48\u8fd9\u4e48\u505a\uff1f\u4e3b\u8981\u8fd8\u662f\u4e3a\u4e86\u65b9\u4fbf\u53c2\u4e0e\u6574\u4e2aInputStream\u7684\u4f53\u7cfb\uff0c\u590d\u7528\u4ee3\u7801\u3002<\/p>\n\n\n\n

ByteArrayInputStream\u5185\u90e8\u5b9a\u4e49\u4e86\u4e00\u4e2abuf\u6570\u7ec4\u548c\u8bb0\u5f55\u6570\u7ec4\u4e2d\u5b9e\u9645\u7684\u5b57\u8282\u6570\uff0cread\u65b9\u6cd5\u4e5f\u5f88\u7b80\u5355\uff0c\u8bfb\u53d6\u4e0b\u4e00\u4e2a\u5b57\u8282\uff0cread(byte b[], int off, int len) \u5c06\u5185\u7f6e\u5b57\u8282\u6570\u7ec4\u8bfb\u5165\u76ee\u6807\u6570\u7ec4\u3002\u5b9e\u9645\u4e0a\uff0c\u6574\u4e2aByteArrayInputStream\u4e5f\u5c31\u662f\u5c06\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u5c01\u88c5\u5728\u5176\u5185\u90e8\u3002\u4e3a\u4ec0\u4e48\u8fd9\u4e48\u505a\uff1f\u4e3b\u8981\u8fd8\u662f\u4e3a\u4e86\u65b9\u4fbf\u53c2\u4e0e\u6574\u4e2aInputStream\u7684\u4f53\u7cfb\uff0c\u590d\u7528\u4ee3\u7801\u3002<\/p>\n\n\n\n

4. <\/strong>\u88c5\u9970\u8005\u5b57\u8282\u6d41<\/strong><\/h3>\n\n\n\n

\u5982\u679c\u6211\u4eec\u60f3\u8981\u8f93\u5165\u4e00\u4e2a\u5b57\u7b26\u4e32\u7c7b\u578b\u6216\u8005int\u578b\u6216\u8005double\u7c7b\u578b\uff0c\u90a3\u8fd8\u9700\u8981\u8c03\u7528\u5404\u81ea\u7684\u8f6c\u5b57\u8282\u6570\u7ec4\u7684\u65b9\u6cd5\uff0c\u7136\u540e\u5c06\u5b57\u8282\u6570\u7ec4\u8f93\u5165\u5230\u6d41\u4e2d\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u88c5\u9970\u6d41\uff0c\u5e2e\u6211\u4eec\u5b8c\u6210\u8f6c\u6362\u7684\u64cd\u4f5c\u3002<\/p>\n\n\n\n

5. <\/strong>\u7f13\u51b2\u6d41<\/strong><\/h3>\n\n\n\n

\u6211\u4eec\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\u5c31\u8981\u5c06\u5b83\u5199\u4f1a\u78c1\u76d8\uff0c\u8fd9\u6837\u6765\u56de\u5f00\u9500\u5f88\u5927\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u7f13\u51b2\u533a\u6765\u63d0\u9ad8\u6548\u7387\uff0c\u5728\u7f13\u51b2\u533a\u6ee1\u7684\u65f6\u5019\uff0c\u6216\u8005\u6d41\u5173\u95ed\u65f6\u5019\uff0c\u5c06\u7f13\u51b2\u533a\u4e2d\u6240\u6709\u7684\u5185\u5bb9\u5168\u90e8\u5199\u4f1a\u78c1\u76d8\u3002<\/p>\n\n\n\n

\u5ef6\u4f38\u9605\u8bfb\uff1a<\/strong><\/p>\n\n\n\n

\u4e8c\u3001java\u4e2d\u7684\u6d41<\/strong><\/h2>\n\n\n\n

Java\u4e2d\u7684\u6d41\u5206\u4e3a\u4e24\u79cd\uff0c\u4e00\u79cd\u662f\u5b57\u8282\u6d41\uff0c\u53e6\u4e00\u79cd\u662f\u5b57\u7b26\u6d41\uff0c\u5206\u522b\u7531\u56db\u4e2a\u62bd\u8c61\u7c7b\u6765\u8868\u793a\uff08\u6bcf\u79cd\u6d41\u5305\u62ec\u8f93\u5165\u548c\u8f93\u51fa\u4e24\u79cd\u6240\u4ee5\u4e00\u5171\u56db\u4e2a\uff09:InputStream\uff0cOutputStream\uff0cReader\uff0cWriter\u3002Java\u4e2d\u5176\u4ed6\u591a\u79cd\u591a\u6837\u53d8\u5316\u7684\u6d41\u5747\u662f\u7531\u5b83\u4eec\u6d3e\u751f\u51fa\u6765\u7684.<\/p>\n\n\n\n

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\u4ee5\u4e0a\u5c31\u662f\u5173\u4e8ejava\u6d41\u7684\u5185\u5bb9\u5e0c\u671b\u5bf9\u5927\u5bb6\u6709\u5e2e\u52a9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"java\u4e2d\u5b57\u8282\u6d41\u7684\u5206\u7c7b\u6709\uff1a1. \u57fa\u7c7b\u6d41\uff1b2. \u6587\u4ef6\u5b57\u8282\u6d41\uff1b3. \u52a8\u6001\u5b57\u8282\u6570\u7ec4\u6d41\uff1b4. \u88c5\u9970\u8005\u5b57\u8282\u6d41\uff1b5. \u7f13\u51b2 […]","protected":false},"author":1,"featured_media":11841,"comment_status":"closed","ping_status":"open","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\/11840"}],"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\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=11840"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/11840\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/11841"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=11840"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=11840"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=11840"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}