{"id":202941,"date":"2025-05-22T10:40:35","date_gmt":"2025-05-22T02:40:35","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202941\/"},"modified":"2025-05-22T10:40:35","modified_gmt":"2025-05-22T02:40:35","slug":"%e5%9b%be%e5%83%8f%e5%a4%84%e7%90%86%e7%ae%97%e6%b3%95%e4%b8%ad%e5%87%bd%e6%95%b0%e5%bc%8fjava%e7%bc%96%e7%a8%8b%e7%9a%84%e6%9c%80%e4%bd%b3%e5%ae%9e%e8%b7%b5%e6%8c%87%e5%8d%97","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202941\/","title":{"rendered":"\u56fe\u50cf\u5904\u7406\u7b97\u6cd5\u4e2d\u51fd\u6570\u5f0fJava\u7f16\u7a0b\u7684\u6700\u4f73\u5b9e\u8df5\u6307\u5357"},"content":{"rendered":"

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

\u56fe\u50cf\u5904\u7406\u7b97\u6cd5\u4e2d\u51fd\u6570\u5f0fJava\u7f16\u7a0b\u7684\u6700\u4f73\u5b9e\u8df5\u6307\u5357<\/h1>\n

\u4f60\u5728\u5b66\u4e60\u6587\u7ae0<\/span>\u76f8\u5173\u7684\u77e5\u8bc6\u5417\uff1f\u672c\u6587\u300a\u56fe\u50cf\u5904\u7406\u7b97\u6cd5\u4e2d\u51fd\u6570\u5f0fJava\u7f16\u7a0b\u7684\u6700\u4f73\u5b9e\u8df5\u6307\u5357\u300b<\/span>\uff0c\u4e3b\u8981\u4ecb\u7ecd\u7684\u5185\u5bb9\u5c31\u6d89\u53ca\u5230<\/span>\uff0c\u5982\u679c\u4f60\u60f3\u63d0\u5347\u81ea\u5df1\u7684\u5f00\u53d1\u80fd\u529b\uff0c\u5c31\u4e0d\u8981\u9519\u8fc7\u8fd9\u7bc7\u6587\u7ae0\uff0c\u5927\u5bb6\u8981\u77e5\u9053\u7f16\u7a0b\u7406\u8bba\u57fa\u7840\u548c\u5b9e\u6218\u64cd\u4f5c\u90fd\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u54e6\uff01<\/p>\n

<\/p>\n

\u56fe\u50cf\u5904\u7406\u7b97\u6cd5\u4e2d\u51fd\u6570\u5f0f Java \u7f16\u7a0b\u7684\u6700\u4f73\u5b9e\u8df5\u6307\u5357<\/strong><\/p>\n

\u5f15\u8a00<\/strong><\/p>\n

\u5229\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u8303\u5f0f\uff0c\u53ef\u4ee5\u63d0\u5347\u56fe\u50cf\u5904\u7406\u7b97\u6cd5\u7684\u6e05\u6670\u5ea6\u548c\u53ef\u7ef4\u62a4\u6027\u3002\u672c\u6587\u5c06\u63a2\u8ba8\u51fd\u6570\u5f0f Java \u7f16\u7a0b\u5728\u56fe\u50cf\u5904\u7406\u4e2d\u7684\u6700\u4f73\u5b9e\u8df5\uff0c\u5e76\u63d0\u4f9b\u5b9e\u6218\u6848\u4f8b\u4ee5\u4f9b\u53c2\u8003\u3002<\/p>\n

\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f<\/strong><\/p>\n

Lambda \u8868\u8fbe\u5f0f\u63d0\u4f9b\u4e86\u4e00\u79cd\u7b80\u6d01\u7684\u65b9\u5f0f\u6765\u5b9a\u4e49\u533f\u540d\u51fd\u6570\u3002\u5728\u56fe\u50cf\u5904\u7406\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 Lambda \u8868\u8fbe\u5f0f\u6765\u8868\u793a\u56fe\u50cf\u4e0a\u7684\u64cd\u4f5c\uff0c\u4f8b\u5982\uff1a<\/p>\n

Consumer<Pixel> grayscaleFilter = pixel -> pixel.setRed(pixel.getGrayScaleValue());<\/pre>\n
\u4f7f\u7528\u51fd\u6570\u5f0f\u63a5\u53e3<\/strong><\/p>\n
\u51fd\u6570\u5f0f\u63a5\u53e3\u53ea\u5305\u542b\u4e00\u4e2a\u62bd\u8c61\u65b9\u6cd5\u3002\u5728\u56fe\u50cf\u5904\u7406\u4e2d\uff0c\u53ef\u4ee5\u521b\u5efa\u81ea\u5b9a\u4e49\u7684\u51fd\u6570\u5f0f\u63a5\u53e3\u6765\u8868\u793a\u7279\u5b9a\u7684\u56fe\u50cf\u64cd\u4f5c\uff0c\u4f8b\u5982\uff1a<\/p>\n
interface PixelFilter {\n    void apply(Pixel pixel);\n}<\/pre>\n
\u4f7f\u7528 Stream API<\/strong><\/p>\n
Java 8 \u7684 Stream API \u63d0\u4f9b\u4e86\u4e00\u79cd\u7b80\u6d01\u7684\u65b9\u6cd5\u6765\u5904\u7406\u96c6\u5408\u5143\u7d20\u3002\u5728\u56fe\u50cf\u5904\u7406\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 Stream API \u6765\u5e76\u884c\u5904\u7406\u50cf\u7d20\u6216\u6267\u884c\u56fe\u50cf\u4e0a\u7684\u805a\u5408\u64cd\u4f5c\u3002\u4ee5\u4e0b\u793a\u4f8b\u4f7f\u7528 Stream API \u8ba1\u7b97\u56fe\u50cf\u4e2d\u50cf\u7d20\u7684\u5e73\u5747\u4eae\u5ea6\uff1a<\/p>\n
double averageBrightness = image.getPixels().stream()\n        .mapToInt(Pixel::getBrightness)\n        .average()\n        .getAsDouble();<\/pre>\n
\u907f\u514d\u4f7f\u7528\u53ef\u53d8\u72b6\u6001<\/strong><\/p>\n
\u51fd\u6570\u5f0f\u7f16\u7a0b\u5f3a\u8c03\u4e0d\u53ef\u53d8\u6027\u3002\u5728\u56fe\u50cf\u5904\u7406\u4e2d\uff0c\u907f\u514d\u4f7f\u7528\u53ef\u53d8\u72b6\u6001\u53ef\u4ee5\u63d0\u9ad8\u5e76\u53d1\u6027\u5e76\u51cf\u5c11\u9519\u8bef\u3002\u4f7f\u7528\u4e0d\u53ef\u53d8\u6570\u636e\u7ed3\u6784\uff0c\u4f8b\u5982 ImmutableList<\/code> \u548c ImmutableMap<\/code>\uff0c\u53ef\u4ee5\u786e\u4fdd\u56fe\u50cf\u7684\u539f\u59cb\u6570\u636e\u4e0d\u53d7\u5f71\u54cd\u3002<\/p>\n
\u5b9e\u65f6\u6848\u4f8b\uff1a\u56fe\u50cf\u6ee4\u955c<\/strong><\/p>\n
\u8ba9\u6211\u4eec\u8003\u8651\u4f7f\u7528\u51fd\u6570\u5f0f\u7f16\u7a0b\u5b9e\u73b0\u4e00\u4e2a\u7b80\u5355\u7684\u7070\u5ea6\u6ee4\u955c\u3002<\/p>\n
import java.awt.image.BufferedImage;\n\npublic class GrayscaleFilter {\n\n    public static void apply(BufferedImage image) {\n        image.getRaster().forEach(new PixelFilter() {\n            @Override\n            public void apply(Pixel pixel) {\n                pixel.setRed(pixel.getGrayScaleValue());\n                pixel.setGreen(pixel.getGrayScaleValue());\n                pixel.setBlue(pixel.getGrayScaleValue());\n            }\n        });\n    }\n}<\/pre>\n
\u7ed3\u8bba<\/strong><\/p>\n
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\u4eca\u5929\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1b\u5173\u4e8e\u6587\u7ae0\u7684\u6280\u672f\u77e5\u8bc6\u6211\u4eec\u4f1a\u4e00\u70b9\u70b9\u6df1\u5165\u4ecb\u7ecd\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u4e00\u8d77\u5b66\u4e60\u7f16\u7a0b~<\/p>\n","protected":false},"excerpt":{"rendered":"
\u56fe\u50cf\u5904\u7406\u7b97\u6cd5\u4e2d\u51fd\u6570\u5f0fJava\u7f16\u7a0b...<\/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-202941","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202941","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=202941"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202941\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202941"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202941"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202941"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}