{"id":1325,"date":"2022-10-30T22:45:35","date_gmt":"2022-10-30T14:45:35","guid":{"rendered":"https:\/\/qaqaq.top\/?p=1325"},"modified":"2022-12-19T20:17:34","modified_gmt":"2022-12-19T12:17:34","slug":"io%e6%b5%81%e4%b8%8e%e7%bd%91%e7%bb%9c%e7%bc%96%e7%a8%8b-%e5%a4%8d%e4%b9%a0","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=1325","title":{"rendered":"IO\u6d41\u4e0e\u7f51\u7edc\u7f16\u7a0b-\u590d\u4e60"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>1. \u8bf4\u660e\u6d41\u7684\u4e09\u79cd\u5206\u7c7b\u65b9\u5f0f\n\u6570\u636e\u5355\u4f4d\uff1a\u5b57\u8282\u6d41\u3001\u5b57\u7b26\u6d41\n\u6d41\u5411\uff1a\u8f93\u5165\u6d41\u3001\u8f93\u51fa\u6d41\n\u6d41\u7684\u89d2\u8272\uff1a\u8282\u70b9\u6d41\u3001\u5904\u7406\u6d41\n\n2. \u5199\u51fa4\u4e2aIO\u6d41\u4e2d\u7684\u62bd\u8c61\u57fa\u7c7b\uff0c4\u4e2a\u6587\u4ef6\u6d41\uff0c4\u4e2a\u7f13\u51b2\u6d41\n\nInputStream\tFileInputStream\t\tBufferedInputStream\nOutputStream\tFileOutputStream\t\tBufferedOutputStream\nReader\t\tFileReader\t\t\tBufferedReader\nWriter\t\tFileWriter\t\t\tBufferedWriter\n\nInputStreamReader\uff1a\u7236\u7c7bReader\n\u5f02\u5e38\uff1aXxxException XxxError\n\nRandomAccessFile\n\n3.\u5b57\u8282\u6d41\u4e0e\u5b57\u7b26\u6d41\u7684\u533a\u522b\u4e0e\u4f7f\u7528\u60c5\u666f\n\u5b57\u8282\u6d41\uff1aread(byte&#91;] buffer) \/ read()\t\u975e\u6587\u672c\u6587\u4ef6\n\u5b57\u7b26\u6d41\uff1aread(char&#91;] cbuf) \/ read()\t\u6587\u672c\u6587\u4ef6\n\u5982\u679c\u53ea\u662f\u5bf9\u6587\u672c\u6587\u4ef6\u7684\u590d\u5236\uff0c\u53ef\u4ee5\u4f7f\u7528\u5b57\u8282\u6d41\uff0c\u5982\u679c\u9700\u8981\u8bfb\u53d6\u6587\u4ef6\u6570\u636e\uff0c\u5219\u53ea\u80fd\u4f7f\u7528\u5b57\u7b26\u6d41\n\n4.\u4f7f\u7528\u7f13\u51b2\u6d41\u5b9e\u73b0a.jpg\u6587\u4ef6\u590d\u5236\u4e3ab.jpg\u6587\u4ef6\u7684\u64cd\u4f5c\nBufferedInputStream bis = new BufferedInputStream(new FileInputStream(new File(\"a.jpg\")));\nBufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(new File(\"b.jpg\")));\n\nbyte&#91;] buffer = new byte&#91;1024];\nint len;\nwhile((len = bis.read(buffer)) != -1){\n\tbos.write(buffer,0,len);\n}\n\nbos,close()\nbis.close()\n\n\/\/\u6b64\u65f6\u7684\u5f02\u5e38\u5e94\u8be5\u4f7f\u7528try-catch-finally\u5904\u7406\u3002\n\n5. \u8f6c\u6362\u6d41\u662f\u54ea\u4e24\u4e2a\u7c7b\uff0c\u5206\u522b\u7684\u4f5c\u7528\u662f\u4ec0\u4e48\uff1f\u8bf7\u5206\u522b\u521b\u5efa\u4e24\u4e2a\u7c7b\u7684\u5bf9\u8c61\u3002\nInputStreamReader\uff1a\u5c06\u8f93\u5165\u7684\u5b57\u8282\u6d41\u8f6c\u6362\u4e3a\u8f93\u5165\u7684\u5b57\u7b26\u6d41\u3002\u89e3\u7801\nOutputStreamWriter\uff1a\u5c06\u8f93\u51fa\u7684\u5b57\u7b26\u6d41\u8f6c\u6362\u4e3a\u8f93\u51fa\u7684\u5b57\u8282\u6d41\u3002\u7f16\u7801\n\nInputStreamReader isr = new InputStreamReader(new FileInputStream(\"a.txt\"),\"utf-8\");\n\nOutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream(\"b.txt\"),\"gbk\");\n\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>package top.qaqaq.java.P606;\n\nimport org.junit.jupiter.api.Test;\n\nimport java.io.*;\n\n\/**\n * @author RichieZhang\n * @create 2022-10-30 \u4e0b\u5348 4:05\n *\/\npublic class StreamTest {\n\n    @Test\n    public void test1(){\n        BufferedInputStream bis = null;\n        BufferedOutputStream bos = null;\n        try {\n            bis = new BufferedInputStream(new FileInputStream(\"\u7231\u60c5\u4e0e\u53cb\u60c5.jpg\"));\n            bos = new BufferedOutputStream(new FileOutputStream(\"\u7231\u60c5\u4e0e\u53cb\u60c55.jpg\"));\n\n            byte&#91;] buffer = new byte&#91;1024];\n            int len;\n            while ((len = bis.read(buffer)) != -1){\n                bos.write(buffer,0,len);\n            }\n        } catch (IOException e) {\n            e.printStackTrace();\n        } finally {\n            if (bos != null){\n                try {\n                    bos.close();\n                } catch (IOException e) {\n                    e.printStackTrace();\n                }\n            }\n            if (bis != null){\n                try {\n                    bis.close();\n                } catch (IOException e) {\n                    e.printStackTrace();\n                }\n            }\n        }\n    }\n\n    @Test\n    public void test2(){\n        InputStreamReader isr = null;\n        OutputStreamWriter osw = null;\n        try {\n            FileInputStream fis = new FileInputStream(\"dbcp.txt\");\n            FileOutputStream fos = new FileOutputStream(\"dbcp_gbk1.txt\");\n\n            isr = new InputStreamReader(fis,\"utf-8\");\n            osw = new OutputStreamWriter(fos, \"gbk\");\n\n            char&#91;] cbuf = new char&#91;1024];\n            int len;\n            while ((len = isr.read(cbuf)) != -1){\n                osw.write(cbuf,0,len);\n            }\n        } catch (IOException e) {\n            e.printStackTrace();\n        } finally {\n            if (osw != null){\n                try {\n                    osw.close();\n                } catch (IOException e) {\n                    e.printStackTrace();\n                }\n            }\n            if (isr != null){\n                try {\n                    isr.close();\n                } catch (IOException e) {\n                    e.printStackTrace();\n                }\n            }\n        }\n\n    }\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[33],"tags":[46],"class_list":["post-1325","post","type-post","status-publish","format-standard","hentry","category-java-","tag-java"],"_links":{"self":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1325"}],"collection":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1325"}],"version-history":[{"count":2,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1325\/revisions"}],"predecessor-version":[{"id":2670,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1325\/revisions\/2670"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1325"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1325"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1325"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}