{"id":10008225,"date":"2023-09-04T17:53:33","date_gmt":"2023-09-04T09:53:33","guid":{"rendered":"https:\/\/blog.itmax.cn\/?p=10008225"},"modified":"2023-09-04T17:53:33","modified_gmt":"2023-09-04T09:53:33","slug":"%e5%89%8d%e7%9e%bb%ef%bd%9cjava-21-%e6%96%b0%e7%89%b9%e6%80%a7-string-templates%ef%bc%88%e5%ad%97%e7%ac%a6%e4%b8%b2%e6%a8%a1%e7%89%88%ef%bc%89","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10008225","title":{"rendered":"\u524d\u77bb\uff5cJava 21 \u65b0\u7279\u6027 String Templates\uff08\u5b57\u7b26\u4e32\u6a21\u7248\uff09"},"content":{"rendered":"<p>\u5728\u65e5\u5e38\u5199Java\u7684\u65f6\u5019\uff0c\u5bf9\u4e8e\u5b57\u7b26\u4e32\u7684\u64cd\u4f5c\u662f\u975e\u5e38\u666e\u904d\u7684\uff0c\u5176\u4e2d\u6700\u5e38\u89c1\u7684\u5c31\u662f\u5bf9\u5b57\u7b26\u4e32\u7684\u7ec4\u7ec7\u3002\u4e5f\u56e0\u4e3a\u8fd9\u4e2a\u64cd\u4f5c\u975e\u5e38\u666e\u904d\uff0c\u6240\u4ee5\u8bde\u751f\u4e86\u5f88\u591a\u65b9\u6848\uff0c\u603b\u4e0b\u6765\u5927\u6982\u6709\u8fd9\u4e48\u51e0\u79cd\uff1a<\/p>\n<ul>\n<li>\u4f7f\u7528<code>+<\/code>\u62fc\u63a5<\/li>\n<li>\u4f7f\u7528<code>StringBuffer<\/code>\u548c<code>SpringBuilder<\/code><\/li>\n<li><code>String::format<\/code> and <code>String::formatted<\/code><\/li>\n<li>\u4f7f\u7528<code>java.text.MessageFormat<\/code><\/li>\n<\/ul>\n<p>\u4e0b\u9762\uff0c\u6211\u4eec\u4e00\u8d77\u6765\u5b66\u4e60\u4e00\u4e0bJava 21\u4e2d\u7684\u65b0\u65b9\u6848\uff01\u5982\u679c\u60a8\u5bf9\u4e8e\u4e0a\u9762\u8fd9\u4e9b\u8fd8\u4e0d\u719f\u6089\u7684\u8bdd\uff0c\u5efa\u8bae\u53ef\u4ee5\u5148\u770b\u4e00\u4e0b\u8fd9\u7bc7<a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=1tHEYFnpkPh62VU8Wy4NCg%3D%3D.S9QVER0Mf9bZrlsMCKhr3eHX5pkutilLFue6veL6QyQuIZ08p7r86%2BcbKipN0cnoVslx3LS5fvWG3GdG0HF%2FSw%3D%3D\" rel=\"noopener noreferrer\">\u300aJava\u81ea\u5e26\u76844\u79cd\u5b57\u7b26\u4e32\u7ec4\u7ec7\u548c\u683c\u5f0f\u5316\u65b9\u6cd5\u300b<\/a>\uff0c\u4e86\u89e3\u4ee5\u524d\u7684\u673a\u5236\uff0c\u8fd9\u6837\u4e0e\u6700\u65b0\u7684\u5904\u7406\u65b9\u6848\u505a\u5bf9\u6bd4\uff0c\u7406\u89e3\u4f1a\u66f4\u6df1\u523b\u3002<\/p>\n<h2>\u6a21\u7248\u8868\u8fbe\u5f0f<\/h2>\n<p>\u5728Java 21\u4e2d\u5904\u7406\u5b57\u7b26\u4e32\u7684\u65b0\u65b9\u6cd5\u79f0\u4e3a\uff1a<strong>Template Expressions<\/strong>\uff0c\u5373\uff1a\u6a21\u7248\u8868\u8fbe\u5f0f\u3002<\/p>\n<p>\u6a21\u7248\u8868\u8fbe\u5f0f\u662fJava\u8bed\u8a00\u4e2d\u7684\u4e00\u79cd\u65b0\u8868\u8fbe\u5f0f\u3002\u5b83\u53ef\u4ee5\u6267\u884c\u5b57\u7b26\u4e32\u63d2\u503c\uff0c\u5e2e\u52a9\u5f00\u53d1\u4eba\u5458\u901a\u8fc7\u7f16\u7a0b\u7684\u65b9\u5f0f\u5b89\u5168\u9ad8\u6548\u5730\u7ec4\u7ec7\u5b57\u7b26\u4e32\u3002\u6b64\u5916\uff0c\u6a21\u677f\u8868\u8fbe\u5f0f\u4e0d\u4ec5\u4ec5\u53ef\u4ee5\u7528\u4e8e\u7ec4\u7ec7\u5b57\u7b26\u4e32\uff0c\u5b83\u8fd8\u53ef\u4ee5\u6839\u636e\u7279\u5b9a\u6a21\u578b\u7684\u89c4\u5219\u5c06\u7ed3\u6784\u5316\u6587\u672c\u8f6c\u6362\u4e3a\u4efb\u4f55\u7c7b\u578b\u7684\u5bf9\u8c61\u3002<\/p>\n<p>\u4e0b\u9762\u901a\u8fc7\u4e00\u4e2a\u7b80\u5355\u7684\u6848\u4f8b\u6765\u8ba4\u8bc6\u4e00\u4e0b\u5b83\uff1a<\/p>\n<pre><code class=\"java\">String blog = &quot;blog.didispace.com&quot;;\nString str = STR.&quot;My blog is \/{blog}&quot;;<\/code><\/pre>\n<p>\u4e0a\u8ff0\u4ee3\u7801\u4e2d\u7684\u7b2c2\u884c\u5c31\u662f\u4e00\u4e2a\u6a21\u7248\u8868\u8fbe\u5f0f\uff0c\u5176\u4e2d\u4e3b\u8981\u5305\u542b\u4e09\u4e2a\u90e8\u5206\uff1a<\/p>\n<ul>\n<li>\u6a21\u7248\u5904\u7406\u5668\uff1a<code>STR<\/code><\/li>\n<li>\u5305\u542b\u5185\u5d4c\u8868\u8fbe\u5f0f\uff08<code>\/{blog}<\/code>\uff09\u7684\u6a21\u7248<\/li>\n<li>\u901a\u8fc7<code>.<\/code>\u628a\u524d\u9762\u4e24\u90e8\u5206\u7ec4\u5408\u8d77\u6765\uff0c\u5f62\u5f0f\u4e0a\u7c7b\u4f3c\u65b9\u6cd5\u8c03\u7528<\/li>\n<\/ul>\n<p>\u5f53\u6a21\u7248\u8868\u8fbe\u5f0f\u8fd0\u884c\u7684\u65f6\u5019\uff0c\u6a21\u7248\u5904\u7406\u5668\u4f1a\u5c06\u6a21\u7248\u5185\u5bb9\u4e0e\u5185\u5d4c\u8868\u8fbe\u5f0f\u7684\u503c\u7ec4\u5408\u8d77\u6765\uff0c\u751f\u6210\u7ed3\u679c\uff0c\u6240\u4ee5\u4e0a\u9762\u6848\u4f8b\u4e2d\u7684\u5b57\u7b26\u4e32str\u5728\u8fd0\u884c\u65f6\u7684\u7ed3\u679c\u4e3a\uff1a<code>My blog is blog.didispace.com<\/code>\u3002<\/p>\n<h2>\u591a\u884c\u6a21\u7248\u8868\u8fbe\u5f0f<\/h2>\n<p>\u8fd8\u8bb0\u5f97\u4e4b\u524d\u6211\u4eec\u7684Java\u65b0\u7279\u6027\u4e13\u680f\u4e2d\uff0c\u4ecb\u7ecd\u8fc7Java 15\u4e2d\u7684<a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=iN%2FxmN%2BIsZf3Hql%2BjhQo7Q%3D%3D.QCdJ9YMYQaDyIRAOK8IYOZPkYpyu%2FbPsGMIt6VTAH7%2Fx%2BgDT1OlRW8PNGY4r%2BCOYwewBq6uBIfBMh8qNZt9CaIwI5XTVUpKKPtSQeyFyo1w%3D\" rel=\"noopener noreferrer\">\u6587\u672c\u5757<\/a>\u7279\u6027\u5417\uff1f\u7c7b\u4f3c\u4e0b\u9762\u8fd9\u6837\u7684\u5199\u6cd5\uff1a<\/p>\n<pre><code class=\"java\">String html = &quot;&quot;&quot;\n    &lt;html&gt;\n    &lt;body&gt;\n      &lt;h1&gt;Java 15 \u65b0\u7279\u6027\uff1a\u6587\u672c\u5757 \uff5c \u7a0b\u5e8f\u733fDD&lt;\/h1&gt;\n      &lt;p&gt;didispace.com&lt;\/p&gt;\n    &lt;\/body&gt;\n    &lt;\/html&gt;\n    &quot;&quot;&quot;;<\/code><\/pre>\n<p>\u6a21\u7248\u8868\u8fbe\u5f0f\u4e5f\u652f\u6301\u7c7b\u4f3c\u7684\u591a\u884c\u5b57\u7b26\u4e32\u5904\u7406\uff0c\u6240\u4ee5\u5f00\u53d1\u8005\u53ef\u4ee5\u7528\u5b83\u6765\u65b9\u4fbf\u7684\u7ec4\u7ec7html\u3001json\u3001xml\u7b49\u5b57\u7b26\u4e32\u5185\u5bb9\uff0c\u6bd4\u5982\u4e0b\u9762\u8fd9\u6837\uff1a<\/p>\n<pre><code class=\"java\">var json = STR.&quot;&quot;&quot;\n{\n    &quot;user&quot;: &quot;\/{name}&quot;,\n    &quot;age: \/{age}\n}\n&quot;&quot;&quot;;<\/code><\/pre>\n<h2>STR\u6a21\u7248\u5904\u7406\u5668<\/h2>\n<p>\u4e0a\u9762\u6848\u4f8b\u4e2d\u6211\u4eec\u6240\u7528\u7684STR\u6a21\u7248\u5904\u7406\u5668\u4e2d\u7684\u5185\u5d4c\u8868\u8fbe\u5f0f\u90fd\u91c7\u7528\u4e86\u5b57\u7b26\u4e32\u5185\u5bb9\uff0c\u800c\u5b9e\u9645\u4e0aSTR\u6a21\u7248\u5904\u7406\u5668\u8fd8\u6709\u66f4\u591a\u7684\u7528\u9014\u3002<\/p>\n<ol>\n<li>\u5185\u5d4c\u8868\u8fbe\u5f0f\u4e2d\u8fd8\u53ef\u4ee5\u4e4b\u524d\u6570\u5b66\u8fd0\u7b97\uff0c\u6bd4\u5982\uff1a<\/li>\n<\/ol>\n<pre><code class=\"java\">int x = 10, y = 20;\nString s = STR.&quot;\/{x} + \/{y} = \/{x + y}&quot;;<\/code><\/pre>\n<p>\u6700\u7ec8s\u5b57\u7b26\u4e32\u7ed3\u679c\u4e3a\uff1a<code>10 + 20 = 30<\/code><\/p>\n<ol start=\"2\">\n<li>\u5185\u5d4c\u8868\u8fbe\u5f0f\u4e2d\u8fd8\u53ef\u4ee5\u8c03\u7528\u65b9\u6cd5\uff0c\u6bd4\u5982\uff1a<\/li>\n<\/ol>\n<pre><code class=\"java\">String s = STR.&quot;My blog is \/{getMyBlog()}&quot;; <\/code><\/pre>\n<p>\u5047\u8bbegetMyBlog\u65b9\u6cd5\u8fd4\u56de\u7684\u5185\u5bb9\u4e3a<code>blog.didispace.com<\/code>\uff0c\u90a3\u4e48\u6700\u7ec8s\u5b57\u7b26\u4e32\u7ed3\u679c\u4e3a\uff1a<code>My blog is blog.didispace.com<\/code>\u3002<\/p>\n<ol start=\"3\">\n<li>\u5185\u5d4c\u8868\u8fbe\u5f0f\u4e2d\u8fd8\u53ef\u4ee5\u8bbf\u95ee\u5bf9\u8c61\u7684\u6210\u5458\u53d8\u91cf\uff0c\u6bd4\u5982\uff1a<\/li>\n<\/ol>\n<pre><code class=\"java\">User u = new User(&quot;didi&quot;, &quot;blog.didispace.com&quot;); \/\/ \u6784\u9020\u51fd\u6570\u53c2\u6570\u4e3aname\u5c5e\u6027\u548cblog\u5c5e\u6027\nString s = STR.&quot;\/{u.name}\u7684\u535a\u5ba2\u5730\u5730\u5740\u4e3a\uff1a+ \/{u.blog}&quot;;<\/code><\/pre>\n<p>\u6700\u7ec8s\u5b57\u7b26\u4e32\u7ed3\u679c\u4e3a\uff1a<code>didi\u7684\u535a\u5ba2\u5730\u5740\u4e3a\uff1ablog.didispace.com<\/code>\u3002<\/p>\n<h2>FMT\u6a21\u7248\u5904\u7406\u5668<\/h2>\n<p>\u9664\u4e86<strong>STR<\/strong>\u6a21\u7248\u5904\u7406\u5668\u4e4b\u5916\uff0cJava\u4e2d\u8fd8\u63d0\u4f9b\u4e86\u53e6\u5916\u4e00\u4e2a\u6a21\u7248\u5904\u7406\u5668\uff1a<strong>FMT<\/strong>\u3002FMT\u6a21\u7248\u5904\u7406\u5668\u9664\u4e86\u4e0eSTR\u6a21\u7248\u5904\u7406\u5668\u4e00\u6837\u63d0\u4f9b\u63d2\u503c\u80fd\u529b\u4e4b\u5916\uff0c\u8fd8\u63d0\u4f9b\u4e86\u5de6\u4fa7\u7684\u683c\u5f0f\u5316\u5904\u7406\u3002\u4e0b\u9762\u901a\u8fc7\u4f8b\u5b50\u6765\u76f4\u63a5\u7406\u89e3FMT\u7684\u529f\u80fd\uff1a<\/p>\n<pre><code class=\"java\">record Rectangle(String name, double width, double height) {\n    double area() {\n        return width * height;\n    }\n}\nRectangle[] zone = new Rectangle[] {\n    new Rectangle(&quot;Alfa&quot;, 17.8, 31.4),\n    new Rectangle(&quot;Bravo&quot;, 9.6, 12.4),\n    new Rectangle(&quot;Charlie&quot;, 7.1, 11.23),\n};\nString table = STR.&quot;&quot;&quot;\n    Description  Width  Height  Area\n    \/{zone[0].name}  \/{zone[0].width}  \/{zone[0].height}     \/{zone[0].area()}\n    \/{zone[1].name}  \/{zone[1].width}  \/{zone[1].height}     \/{zone[1].area()}\n    \/{zone[2].name}  \/{zone[2].width}  \/{zone[2].height}     \/{zone[2].area()}\n    Total \/{zone[0].area() + zone[1].area() + zone[2].area()}\n    &quot;&quot;&quot;;<\/code><\/pre>\n<p>\u4e0a\u9762\u8fd9\u5757\u662f\u7531STR\u6a21\u7248\u5904\u7406\u5668\u7ec4\u7ec7\u5b57\u7b26\u4e32\u8868\u683c\u6570\u636e\uff0c\u4ece\u6a21\u7248\u8868\u8fbe\u5f0f\u6765\u770b\u662f\u975e\u5e38\u6574\u9f50\u7684\uff0c\u4f46\u662f\u7531\u4e8e\u6a21\u7248\u4e2d\u5185\u5d4c\u8868\u8fbe\u5f0f\u7684\u503c\u957f\u77ed\u4e0d\u4e00\uff0c\u6700\u7ec8\u8f93\u51fa\u7ed3\u679c\u5f88\u6709\u53ef\u80fd\u5dee\u5f3a\u4eba\u610f\uff0c\u6bd4\u5982STR\u6a21\u7248\u5904\u7406\u5668\u5904\u7406\u540e\u7684\u7ed3\u679c\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n<pre><code>Description  Width  Height  Area\nAlfa  17.8  31.4     558.92\nBravo  9.6  12.4     119.03999999999999\nCharlie  7.1  11.23     79.733\nTotal 757.693<\/code><\/pre>\n<p>\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u5c31\u53ef\u4ee5\u91c7\u7528FMT\u6a21\u7248\u5904\u7406\u5668\uff0c\u5728\u6bcf\u4e00\u5217\u5de6\u4fa7\u5b9a\u4e49\u683c\u5f0f<\/p>\n<pre><code class=\"java\">String table = FMT.&quot;&quot;&quot;\n    Description     Width    Height     Area\n    %-12s\/{zone[0].name}  %7.2f\/{zone[0].width}  %7.2f\/{zone[0].height}     %7.2f\/{zone[0].area()}\n    %-12s\/{zone[1].name}  %7.2f\/{zone[1].width}  %7.2f\/{zone[1].height}     %7.2f\/{zone[1].area()}\n    %-12s\/{zone[2].name}  %7.2f\/{zone[2].width}  %7.2f\/{zone[2].height}     %7.2f\/{zone[2].area()}\n    \/{&quot; &quot;.repeat(28)} Total %7.2f\/{zone[0].area() + zone[1].area() + zone[2].area()}\n    &quot;&quot;&quot;;<\/code><\/pre>\n<p>\u8fd9\u6837\u7684\u7ed3\u679c\u5c06\u662f\u5982\u4e0b\u8fd9\u6837\uff0c\u83b7\u5f97\u4e00\u4e2a\u6574\u9f50\u7684\u7ed3\u679c\uff1a<\/p>\n<pre><code>Description     Width    Height     Area\nAlfa            17.80    31.40      558.92\nBravo            9.60    12.40      119.04\nCharlie          7.10    11.23       79.73\n                             Total  757.69<\/code><\/pre>\n<p>\u5173\u4e8eJava 21\u4e2d\u63a8\u51fa\u7684String Templates\u7279\u6027\u8fd8\u6709\u5f88\u591a\u9ad8\u7ea7\u80fd\u529b\uff0c\u6bd4\u5982\uff1a\u81ea\u5b9a\u4e49\u6a21\u7248\u5904\u7406\u5668\u7b49\u3002\u56e0\u4e3a\u8be5\u7279\u6027\u8fd8\u5904\u4e8ePreview\u9636\u6bb5\uff0c\u6240\u4ee5DD\u4e5f\u8fd8\u6ca1\u6709\u6df1\u5165\u7814\u7a76\uff0c\u4ec5\u5c1d\u9c9c\u4e86\u4e00\u4e0b\u57fa\u672c\u529f\u80fd\uff0c\u5982\u679c\u60a8\u5bf9\u5176\u4ed6\u9ad8\u7ea7\u80fd\u529b\u611f\u5174\u8da3\uff0c\u4e5f\u53ef\u4ee5\u901a\u8fc7\u5b98\u7f51\u5b66\u4e60\u3002\u7b49\u8be5\u529f\u80fd\u6b63\u5f0f\u53d1\u5e03\u4e4b\u540e\uff0c\u6211\u4f1a\u5728 <a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=VQkM7rxA71nnVocdxOeQhA%3D%3D.lg3UNhY8KrBBH6nyuiTZO8vVaBjWBIkxHIT%2FIGiNP4SXbDR0%2F5EqMvLjBdSBng4C\" rel=\"noopener noreferrer\">Java\u65b0\u7279\u6027\u4e13\u680f<\/a> \u4e2d\u66f4\u65b0\u89e3\u8bfb\u6240\u6709\u5185\u5bb9\uff0c\u6b22\u8fce\u5173\u6ce8\u4e0e\u6536\u85cf\u3002<\/p>\n<blockquote><p>\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u516c\u4f17\u53f7\uff1a\u7a0b\u5e8f\u733fDD\u3002\u7b2c\u4e00\u65f6\u95f4\u4e86\u89e3\u524d\u6cbf\u884c\u4e1a\u6d88\u606f\u3001\u5206\u4eab\u6df1\u5ea6\u6280\u672f\u5e72\u8d27\u3001\u83b7\u53d6\u4f18\u8d28\u5b66\u4e60\u8d44\u6e90<\/p><\/blockquote>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000044179284\">https:\/\/segmentfault.com\/a\/1190000044179284<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u65e5\u5e38\u5199Java\u7684\u65f6\u5019\uff0c\u5bf9\u4e8e\u5b57\u7b26\u4e32\u7684\u64cd\u4f5c\u662f\u975e\u5e38\u666e\u904d\u7684\uff0c\u5176\u4e2d\u6700\u5e38\u89c1\u7684\u5c31\u662f\u5bf9\u5b57\u7b26\u4e32\u7684\u7ec4\u7ec7\u3002\u4e5f\u56e0\u4e3a\u8fd9\u4e2a\u64cd\u4f5c\u975e\u5e38\u666e\u904d\uff0c 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