{"id":63,"date":"2021-01-06T16:07:23","date_gmt":"2021-01-06T08:07:23","guid":{"rendered":"https:\/\/www.52dixiaowo.com\/java\/?p=63"},"modified":"2021-03-22T17:20:24","modified_gmt":"2021-03-22T09:20:24","slug":"jackson-json%e4%b8%8ejava%e8%bd%ac%e6%8d%a2","status":"publish","type":"post","link":"https:\/\/www.52dixiaowo.com\/java\/post-63.html","title":{"rendered":"jackson &#8212; json\u4e0ejava\u8f6c\u6362"},"content":{"rendered":"\n<p>json \u89e3\u6790\u5668\u6982\u5ff5\uff1a\u662f\u5c06 json \u8f6c\u6362\u4e3a\u5176\u4ed6\u8bed\u8a00\u7684\u5de5\u5177<\/p>\n\n\n\n<p>\u5e38\u89c1\u7684 json \u89e3\u6790\u5668\u6709\uff1aJsonlib\uff0cGson\uff0cfastjson\uff0cjackson<\/p>\n\n\n\n<p>\u8fd9\u91cc\u6211\u4eec\u5b66\u4e60 jackson\uff0c\u8fd9\u662f springmvc \u6846\u67b6\u81ea\u5e26\u7684 json \u89e3\u6790\u5668\u3002<\/p>\n\n\n\n<h2>\u5bfc\u5165Jar\u5305\u6216\u5750\u6807<\/h2>\n\n\n\n<h5>1.\u4e0b\u8f7d jar \u5305\uff0c\u70b9\u51fb<a rel=\"noreferrer noopener\" href=\"https:\/\/pan.5252.online\/%E5%BC%80%E5%8F%91%E5%B7%A5%E5%85%B7\/JavaJar\/json\/jackson\/\" data-type=\"URL\" data-id=\"https:\/\/pan.5252.online\/%E5%BC%80%E5%8F%91%E5%B7%A5%E5%85%B7\/JavaJar\/json\/jackson\/\" target=\"_blank\">\u8fd9\u91cc<\/a> \uff0c\u5e76\u5bfc\u5165\u9879\u76ee\u4e2d\uff083\u4e2a\uff09<\/h5>\n\n\n\n<p>maven\u5bfc\u5165\u5982\u4e0b\u5750\u6807<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code> &lt;dependency&gt;\n     &lt;groupId&gt;com.fasterxml.jackson.core&lt;\/groupId&gt;\n     &lt;artifactId&gt;jackson-core&lt;\/artifactId&gt;\n     &lt;version&gt;2.7.3&lt;\/version&gt;\n   &lt;\/dependency&gt;\n  &lt;dependency&gt;\n  &lt;groupId&gt;com.fasterxml.jackson.core&lt;\/groupId&gt;\n  &lt;artifactId&gt;jackson-databind&lt;\/artifactId&gt;\n  &lt;version&gt;2.7.3&lt;\/version&gt;\n  &lt;\/dependency&gt;\n  &lt;dependency&gt;\n    &lt;groupId&gt;com.fasterxml.jackson.core&lt;\/groupId&gt;\n    &lt;artifactId&gt;jackson-annotations&lt;\/artifactId&gt;\n    &lt;version&gt;2.7.3&lt;\/version&gt;\n  &lt;\/dependency&gt;<\/code><\/pre>\n\n\n\n<h5>2.\u521b\u5efa\u5bf9\u5e94\u7684\u5b9e\u4f53\u7c7b\uff0c\u51c6\u5907\u8f6c\u6362<\/h5>\n\n\n\n<h2>Java\u5bf9\u8c61\u8f6c\u6362\u4e3aJson\u5bf9\u8c61<\/h2>\n\n\n\n<p>\u6ce8\u610f : \u8bf7\u786e\u4fdd\u4f60\u7684Java\u5bf9\u8c61\u662fbean\u5bf9\u8c61, \u975e\u6807\u51c6\u5bf9\u8c61\u53ef\u80fd\u65e0\u6cd5\u8f6c\u6362!<\/p>\n\n\n\n<h5>1.\u5b9e\u4f8b\u5316\u5bf9\u8c61\uff08\u8fd9\u91cc\u5047\u8bbe\u4e3a person\uff09<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>Person p = new Person();\np.setName(\"\u5f20\u4e09\");\np.setAge(23);\np.setGender(\"\u7537\");<\/code><\/pre>\n\n\n\n<h5>2.\u521b\u5efa Jackson \u7684\u6838\u5fc3\u5bf9\u8c61 ObjectMapper<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>ObjectMapper mapper = new ObjectMapper();<\/code><\/pre>\n\n\n\n<h5>3.\u5f00\u59cb\u8f6c\u6362<\/h5>\n\n\n\n<p>\u7b2c\u4e00\u79cd\u8f6c\u6362\u5199\u51fa\u5230\u6587\u4ef6\uff1awriteValue(\u53c2\u65701\u591a\u79cd\u91cd\u8f7d, Object)<\/p>\n\n\n\n<p>\u2460File\uff1a\u5199\u51fa\u5230\u6307\u5b9a\u6587\u4ef6\u2461Writer\uff1a\u5b57\u7b26\u8f93\u51fa\u6d41\u2462OutputStream\uff1a\u5b57\u8282\u8f93\u51fa\u6d41<\/p>\n\n\n\n<p>\u6b64\u65b9\u6cd5, \u53ef\u4ee5\u76f4\u63a5\u5982\u679c\u4f7f\u7528 response.getWriter() \u4f5c\u4e3a\u7b2c\u4e00\u4e2a\u53c2\u6570\u53ef\u76f4\u63a5\u5199\u56de\u5ba2\u6237\u7aef<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>mapper.writeValue(new File(\"d:a.txt\"),p);<\/code><\/pre>\n\n\n\n<p>\u7b2c\u4e8c\u79cd\u8f6c\u6362\u76f4\u63a5\u83b7\u53d6\uff1awriteValueAsString(Object object)<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>String json = mapper.writeValueAsString(p);\n\/\/{\"name\":\"\u5f20\u4e09\",\"age\":23,\"gender\":\"\u7537\"}<\/code><\/pre>\n\n\n\n<p>\u5bf9\u65f6\u95f4\u65e5\u671f\u7c7b\u578b\u7684\u503c\uff0c\u9700\u8981\u5728class\u7684\u5c5e\u6027\u4e2d\u52a0\u4e0a\u6ce8\u89e3\uff0c\u4ee5\u4fbf\u5ffd\u7565\u6216\u683c\u5f0f\u5316<\/p>\n\n\n\n<ul><li>@JsonIgnore \/\/ \u5ffd\u7565\u8be5\u5c5e\u6027<\/li><li>@JsonFormat(pattern = &#8220;yyyy-MM-dd&#8221;)  \/\/pattern\u662f\u81ea\u5b9a\u4e49\u683c\u5f0f<\/li><\/ul>\n\n\n\n<p>\uff08\u5bf9 list \u5bf9\u8c61\u8f6c\u6362\u540e\u662f\u4e00\u4e2a\u6570\u7ec4\uff0c\u5bf9 map \u5bf9\u8c61\u8f6c\u6362\u540e\u662f\u666e\u901a\u7684 json \u5bf9\u8c61\uff09<\/p>\n\n\n\n<h2>Json\u5bf9\u8c61\u8f6c\u6362\u4e3aJava\u5bf9\u8c61<\/h2>\n\n\n\n<h5>1.\u521d\u59cb\u5316 json \u5b57\u7b26\u4e32<\/h5>\n\n\n\n<p>\u8fd9\u91cc\u7684\u8f6c\u4e49\u5b57\u7b26\u662f idea \u81ea\u52a8\u6dfb\u52a0\u7684<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>String json = \"{\\\"gender\\\":\\\"\u7537\\\",\\\"name\\\":\\\"\u5f20\u4e09\\\",\\\"age\\\":23}\";<\/code><\/pre>\n\n\n\n<h5>2.\u521b\u5efaObjectMapper\u5bf9\u8c61<\/h5>\n\n\n\n<pre class=\"wp-block-code\"><code>ObjectMapper mapper = new ObjectMapper();<\/code><\/pre>\n\n\n\n<h5>3.\u5f00\u59cb\u8f6c\u6362\uff0c\u5e76\u6253\u5370\u7ed3\u679c<\/h5>\n\n\n\n<p>\u8fd9\u91cc\u4f7f\u7528 mapper.readValue \u65b9\u6cd5<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Person person = mapper.readValue(json, Person.class);\nSystem.out.println(person);\n\/\/Person{name='\u5f20\u4e09', age=23, gender='\u7537'}<\/code><\/pre>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>json \u89e3\u6790\u5668\u6982\u5ff5\uff1a\u662f\u5c06 json \u8f6c\u6362\u4e3a\u5176\u4ed6\u8bed\u8a00\u7684\u5de5\u5177 \u5e38\u89c1\u7684 json \u89e3\u6790\u5668\u6709\uff1aJsonlib\uff0cGso&hellip; <a href=\"https:\/\/www.52dixiaowo.com\/java\/post-63.html\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb <span class=\"screen-reader-text\">jackson &#8212; json\u4e0ejava\u8f6c\u6362<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[6],"tags":[],"_links":{"self":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/63"}],"collection":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/comments?post=63"}],"version-history":[{"count":7,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/63\/revisions"}],"predecessor-version":[{"id":1237,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/posts\/63\/revisions\/1237"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/media?parent=63"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/categories?post=63"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/java\/wp-json\/wp\/v2\/tags?post=63"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}