{"id":65521,"date":"2025-05-03T08:11:03","date_gmt":"2025-05-03T00:11:03","guid":{"rendered":"https:\/\/fwq.ai\/blog\/65521\/"},"modified":"2025-05-03T08:11:03","modified_gmt":"2025-05-03T00:11:03","slug":"java%e6%80%8e%e4%b9%88%e5%88%a4%e6%96%ad%e6%98%afjson%e6%95%b0%e7%bb%84-2","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/65521\/","title":{"rendered":"java\u600e\u4e48\u5224\u65ad\u662fjson\u6570\u7ec4"},"content":{"rendered":"<blockquote><p>\n  \u5224\u65ad java \u4e2d\u7684\u503c\u662f\u5426\u4e3a json \u6570\u7ec4\u7684\u65b9\u6cd5\u6709\uff1a\u4f7f\u7528 instanceof \u8fd0\u7b97\u7b26\u68c0\u67e5 jsonarray \u7c7b\u5b9e\u4f8b\u3002\u4f7f\u7528 jackson \u5e93\u7684 isarray() \u65b9\u6cd5\u3002\u4f7f\u7528 get() \u65b9\u6cd5\u8fd4\u56de\u4f4d\u7f6e\u4e3a -1 \u7684\u6570\u7ec4\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202411\/13\/2024111302514779417.jpg\" class=\"aligncenter\" title=\"java\u600e\u4e48\u5224\u65ad\u662fjson\u6570\u7ec4\u63d2\u56fe\" alt=\"java\u600e\u4e48\u5224\u65ad\u662fjson\u6570\u7ec4\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u5224\u65ad Java \u4e2d\u7684\u503c\u662f JSON \u6570\u7ec4<\/strong><\/p>\n<p>\u5224\u65ad Java \u4e2d\u7684\u503c\u662f\u5426\u4e3a JSON \u6570\u7ec4\u7684\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n<p><strong>1. \u4f7f\u7528 instanceof \u8fd0\u7b97\u7b26\uff1a<\/strong><\/p>\n<ul>\n<li>instanceof \u8fd0\u7b97\u7b26\u7528\u6765\u68c0\u67e5\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u5c5e\u4e8e\u67d0\u4e2a\u7c7b\u7684\u5b9e\u4f8b\u3002<\/li>\n<li>\u5bf9\u4e8e JSON \u6570\u7ec4\uff0c\u53ef\u4ee5\u4f7f\u7528 JsonArray \u7c7b\uff1a<\/li>\n<\/ul>\n<pre>if (value instanceof JsonArray) {\n  \/\/ \u662f JSON \u6570\u7ec4\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>2. \u4f7f\u7528 isArray() \u65b9\u6cd5\uff1a<\/strong><\/p>\n<p><span>\u7acb\u5373\u5b66\u4e60<\/span>\u201c\u201d\uff1b<\/p>\n<ul>\n<li>Jackson \u5e93\u63d0\u4f9b\u4e86\u4e00\u4e2a isArray() \u65b9\u6cd5\uff0c\u7528\u4e8e\u68c0\u67e5\u4e00\u4e2a JSON \u503c\u662f\u5426\u4e3a\u6570\u7ec4\uff1a<\/li>\n<\/ul>\n<pre>import com.fasterxml.jackson.databind.JsonNode;\nimport com.fasterxml.jackson.databind.ObjectMapper;\n\nObjectMapper mapper = new ObjectMapper();\nJsonNode node = mapper.readTree(jsonString);\nif (node.isArray()) {\n  \/\/ \u662f JSON \u6570\u7ec4\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>3. \u4f7f\u7528 get() \u65b9\u6cd5\uff1a<\/strong><\/p>\n<ul>\n<li>Jackson \u5e93\u7684 get() \u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u7279\u5b9a\u4f4d\u7f6e\u7684\u503c\u3002<\/li>\n<li>\u5bf9\u4e8e JSON \u6570\u7ec4\uff0c\u5982\u679c\u4f4d\u7f6e\u4e3a -1\uff0c\u5219\u8fd4\u56de\u6574\u4e2a\u6570\u7ec4\uff1a<\/li>\n<\/ul>\n<pre>JsonNode array = node.get(-1);\nif (array != null &amp;&amp; array.isArray()) {\n  \/\/ \u662f JSON \u6570\u7ec4\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u793a\u4f8b\uff1a<\/strong><\/p>\n<pre>String jsonString = \"[1, 2, 3]\";\n\n\/\/ \u4f7f\u7528 instanceof \u8fd0\u7b97\u7b26\nif (value instanceof JsonArray) {\n  System.out.println(\"\u662f JSON \u6570\u7ec4\");\n}\n\n\/\/ \u4f7f\u7528 isArray() \u65b9\u6cd5\nObjectMapper mapper = new ObjectMapper();\nJsonNode node = mapper.readTree(jsonString);\nif (node.isArray()) {\n  System.out.println(\"\u662f JSON \u6570\u7ec4\");\n}\n\n\/\/ \u4f7f\u7528 get() \u65b9\u6cd5\nJsonNode array = node.get(-1);\nif (array != null &amp;&amp; array.isArray()) {\n  System.out.println(\"\u662f JSON \u6570\u7ec4\");\n}<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u4ee5\u4e0a\u5c31\u662fjava\u600e\u4e48\u5224\u65ad\u662f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8IDCBABY\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5224\u65ad java \u4e2d\u7684\u503c\u662f\u5426\u4e3a json \u6570\u7ec4\u7684\u65b9\u6cd5\u6709\uff1a\u4f7f\u7528 instanceof \u8fd0\u7b97\u7b26\u68c0\u67e5 jsonarray \u7c7b\u5b9e\u4f8b\u3002\u4f7f\u7528 jackson \u5e93\u7684 isarray() \u65b9\u6cd5\u3002\u4f7f\u7528 get() \u65b9\u6cd5\u8fd4\u56de\u4f4d\u7f6e\u4e3a -1 \u7684\u6570\u7ec4\u3002 \u5982\u4f55\u5224\u65ad Java \u4e2d\u7684\u503c\u662f JSON \u6570\u7ec4 \u5224\u65ad Java \u4e2d\u7684\u503c\u662f\u5426\u4e3a JSON \u6570\u7ec4\u7684\u65b9\u6cd5\u5982\u4e0b\uff1a 1. \u4f7f\u7528 instanceof \u8fd0\u7b97\u7b26\uff1a instanceof \u8fd0\u7b97\u7b26\u7528\u6765\u68c0\u67e5\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u5c5e\u4e8e\u67d0\u4e2a\u7c7b\u7684\u5b9e\u4f8b\u3002 \u5bf9\u4e8e JSON \u6570\u7ec4\uff0c\u53ef\u4ee5\u4f7f\u7528 JsonArray \u7c7b\uff1a if (value instanceof JsonArray) { \/\/ \u662f JSON \u6570\u7ec4 } \u767b\u5f55\u540e\u590d\u5236 2. \u4f7f\u7528 isArray() \u65b9\u6cd5\uff1a \u7acb\u5373\u5b66\u4e60\u201c\u201d\uff1b Jackson [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-65521","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/65521","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=65521"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/65521\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=65521"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=65521"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=65521"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}