{"id":6716,"date":"2018-02-18T07:04:48","date_gmt":"2018-02-18T00:04:48","guid":{"rendered":"https:\/\/huongdanjava.com\/?p=6716"},"modified":"2024-11-17T15:31:57","modified_gmt":"2024-11-17T08:31:57","slug":"convert-java-object-json-using-jackson","status":"publish","type":"post","link":"https:\/\/huongdanjava.com\/convert-java-object-json-using-jackson.html","title":{"rendered":"Convert Java object to JSON using Jackson"},"content":{"rendered":"

Jackson<\/a> is a standard library for handling JSON-related issues in Java. In this tutorial, we will learn how to convert Java objects to JSON using the Jackson library.<\/p>\n

First, I will illustrate with a Maven project as follows:<\/p>\n

\"\"<\/p>\n

Jackson dependency is as follows:<\/p>\n

<dependency>\r\n    <groupId>com.fasterxml.jackson.core<\/groupId>\r\n    <artifactId>jackson-databind<\/artifactId>\r\n    <version>2.18.1<\/version>\r\n<\/dependency><\/pre>\n
The current Application class has the following contents:<\/p>\n
package com.huongdanjava.jackson;\r\n\r\npublic class Application {\r\n\r\n\tpublic static void main(String[] args) {\r\n\r\n\t}\r\n}\r\n<\/pre>\n
Since we are converting a Java object to a JSON string, the first thing we need to do is to define a Java object. I have defined a Student class in the com.huongdanjava.jackson package as simple as:<\/p>\n
package com.huongdanjava.jackson;\r\n\r\npublic class Student {\r\n\r\n\tprivate String name;\r\n\tprivate int age;\r\n\r\n\tpublic String getName() {\r\n\t\treturn name;\r\n\t}\r\n\r\n\tpublic void setName(String name) {\r\n\t\tthis.name = name;\r\n\t}\r\n\r\n\tpublic int getAge() {\r\n\t\treturn age;\r\n\t}\r\n\r\n\tpublic void setAge(int age) {\r\n\t\tthis.age = age;\r\n\t}\r\n}\r\n<\/pre>\n
OK, let’s get started on our topic.<\/p>\n
First, we need to initialize a Student object:<\/p>\n
Student student = new Student();\r\nstudent.setName(\"Khanh\");\r\nstudent.setAge(30);<\/pre>\n
To convert this Student object to a JSON string, I would use the ObjectMapper object in the Jackson library to do this.<\/p>\n
We will initialize it first:<\/p>\n
ObjectMapper om = new ObjectMapper();<\/pre>\n
and use its writeValueAsString() method to convert a Student object to a JSON string:<\/p>\n
String json = om.writeValueAsString(student);\r\nSystem.out.println(json);<\/pre>\n
Result:<\/p>\n
\"Convert<\/p>\n
If you want the resulting JSON string to be better formatted then you can use the ObjectMapper object and call the writerWithDefaultPrettyPrinter() method before calling the writeValueAsString() method:<\/p>\n
ObjectMapper om = new ObjectMapper();\r\nString json = om.writerWithDefaultPrettyPrinter().writeValueAsString(student);\r\nSystem.out.println(json);<\/pre>\n
At this point, the result will be:<\/p>\n
\"Convert<\/p>\n\n\n
\n            \n
\n    \n
\n            
\n            \n\n
<\/div>\n        <\/div>\n            
\n            \n\n
<\/div>\n        <\/div>\n            
\n            \n\n
<\/div>\n        <\/div>\n            
\n            \n\n
<\/div>\n        <\/div>\n            
\n            \n\n
<\/div>\n        <\/div>\n    <\/div>\n    \n
\n            
\n            \n\n
<\/div>\n        <\/div>\n            
\n            \n\n
<\/div>\n        <\/div>\n            
\n            \n\n
<\/div>\n        <\/div>\n            
\n            \n\n
<\/div>\n        <\/div>\n            
\n            \n\n
<\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n
\n            <\/span>\n    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"
Jackson is a standard library for handling JSON-related issues in Java. In this tutorial, we will learn how to convert Java objects to JSON using the Jackson library. First, I will illustrate with a Maven project as follows: Jackson dependency is as follows: <dependency> <groupId>com.fasterxml.jackson.core<\/groupId>… Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":1377,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1201],"tags":[],"class_list":["post-6716","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-jackson-en","clearfix"],"yoast_head":"\nConvert Java object to JSON using Jackson - Huong Dan Java<\/title>\n<meta name=\"description\" content=\"In this tutorial, we will learn how to convert Java object to JSON using Jackson.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/huongdanjava.com\/convert-java-object-json-using-jackson.html\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Convert Java object to JSON using Jackson - Huong Dan Java\" \/>\n<meta property=\"og:description\" content=\"In this tutorial, we will learn how to convert Java object to JSON using Jackson.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/huongdanjava.com\/convert-java-object-json-using-jackson.html\" \/>\n<meta property=\"og:site_name\" content=\"Huong Dan Java\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/nhkhanh2406\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/nhkhanh2406\" \/>\n<meta property=\"article:published_time\" content=\"2018-02-18T00:04:48+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-11-17T08:31:57+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/huongdanjava.com\/wp-content\/uploads\/2016\/09\/json.png\" \/>\n\t<meta property=\"og:image:width\" content=\"300\" \/>\n\t<meta property=\"og:image:height\" content=\"300\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Khanh Nguyen\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@https:\/\/twitter.com\/KhanhNguyenJ\" \/>\n<meta name=\"twitter:site\" content=\"@KhanhNguyenJ\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Khanh Nguyen\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/convert-java-object-json-using-jackson.html#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/convert-java-object-json-using-jackson.html\"},\"author\":{\"name\":\"Khanh Nguyen\",\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/#\\\/schema\\\/person\\\/dc859d7f8cbea3b593e6738de9cbb82d\"},\"headline\":\"Convert Java object to JSON using Jackson\",\"datePublished\":\"2018-02-18T00:04:48+00:00\",\"dateModified\":\"2024-11-17T08:31:57+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/convert-java-object-json-using-jackson.html\"},\"wordCount\":189,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/#\\\/schema\\\/person\\\/dc859d7f8cbea3b593e6738de9cbb82d\"},\"image\":{\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/convert-java-object-json-using-jackson.html#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/huongdanjava.com\\\/wp-content\\\/uploads\\\/2016\\\/09\\\/json.png\",\"articleSection\":[\"Jackson\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/huongdanjava.com\\\/convert-java-object-json-using-jackson.html#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/convert-java-object-json-using-jackson.html\",\"url\":\"https:\\\/\\\/huongdanjava.com\\\/convert-java-object-json-using-jackson.html\",\"name\":\"Convert Java object to JSON using Jackson - Huong Dan Java\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/convert-java-object-json-using-jackson.html#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/convert-java-object-json-using-jackson.html#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/huongdanjava.com\\\/wp-content\\\/uploads\\\/2016\\\/09\\\/json.png\",\"datePublished\":\"2018-02-18T00:04:48+00:00\",\"dateModified\":\"2024-11-17T08:31:57+00:00\",\"description\":\"In this tutorial, we will learn how to convert Java object to JSON using Jackson.\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/convert-java-object-json-using-jackson.html#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/huongdanjava.com\\\/convert-java-object-json-using-jackson.html\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/convert-java-object-json-using-jackson.html#primaryimage\",\"url\":\"https:\\\/\\\/huongdanjava.com\\\/wp-content\\\/uploads\\\/2016\\\/09\\\/json.png\",\"contentUrl\":\"https:\\\/\\\/huongdanjava.com\\\/wp-content\\\/uploads\\\/2016\\\/09\\\/json.png\",\"width\":300,\"height\":300},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/convert-java-object-json-using-jackson.html#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/huongdanjava.com\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Convert Java object to JSON using Jackson\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/#website\",\"url\":\"https:\\\/\\\/huongdanjava.com\\\/\",\"name\":\"Huong Dan Java\",\"description\":\"Java development tutorials\",\"publisher\":{\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/#\\\/schema\\\/person\\\/dc859d7f8cbea3b593e6738de9cbb82d\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/huongdanjava.com\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":[\"Person\",\"Organization\"],\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/#\\\/schema\\\/person\\\/dc859d7f8cbea3b593e6738de9cbb82d\",\"name\":\"Khanh Nguyen\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/wp-content\\\/uploads\\\/2021\\\/07\\\/CC6FAC58-D227-4DD8-93D1-6D6A795577E3_1_201_a.jpeg\",\"url\":\"https:\\\/\\\/huongdanjava.com\\\/wp-content\\\/uploads\\\/2021\\\/07\\\/CC6FAC58-D227-4DD8-93D1-6D6A795577E3_1_201_a.jpeg\",\"contentUrl\":\"https:\\\/\\\/huongdanjava.com\\\/wp-content\\\/uploads\\\/2021\\\/07\\\/CC6FAC58-D227-4DD8-93D1-6D6A795577E3_1_201_a.jpeg\",\"width\":1267,\"height\":1517,\"caption\":\"Khanh Nguyen\"},\"logo\":{\"@id\":\"https:\\\/\\\/huongdanjava.com\\\/wp-content\\\/uploads\\\/2021\\\/07\\\/CC6FAC58-D227-4DD8-93D1-6D6A795577E3_1_201_a.jpeg\"},\"description\":\"I love Java and everything related to Java.\",\"sameAs\":[\"https:\\\/\\\/huongdanjava.com\",\"https:\\\/\\\/www.facebook.com\\\/nhkhanh2406\",\"https:\\\/\\\/x.com\\\/https:\\\/\\\/twitter.com\\\/KhanhNguyenJ\"]}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Convert Java object to JSON using Jackson - Huong Dan Java","description":"In this tutorial, we will learn how to convert Java object to JSON using Jackson.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/huongdanjava.com\/convert-java-object-json-using-jackson.html","og_locale":"en_US","og_type":"article","og_title":"Convert Java object to JSON using Jackson - Huong Dan Java","og_description":"In this tutorial, we will learn how to convert Java object to JSON using Jackson.","og_url":"https:\/\/huongdanjava.com\/convert-java-object-json-using-jackson.html","og_site_name":"Huong Dan Java","article_publisher":"https:\/\/www.facebook.com\/nhkhanh2406","article_author":"https:\/\/www.facebook.com\/nhkhanh2406","article_published_time":"2018-02-18T00:04:48+00:00","article_modified_time":"2024-11-17T08:31:57+00:00","og_image":[{"width":300,"height":300,"url":"https:\/\/huongdanjava.com\/wp-content\/uploads\/2016\/09\/json.png","type":"image\/png"}],"author":"Khanh Nguyen","twitter_card":"summary_large_image","twitter_creator":"@https:\/\/twitter.com\/KhanhNguyenJ","twitter_site":"@KhanhNguyenJ","twitter_misc":{"Written by":"Khanh Nguyen","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/huongdanjava.com\/convert-java-object-json-using-jackson.html#article","isPartOf":{"@id":"https:\/\/huongdanjava.com\/convert-java-object-json-using-jackson.html"},"author":{"name":"Khanh Nguyen","@id":"https:\/\/huongdanjava.com\/#\/schema\/person\/dc859d7f8cbea3b593e6738de9cbb82d"},"headline":"Convert Java object to JSON using Jackson","datePublished":"2018-02-18T00:04:48+00:00","dateModified":"2024-11-17T08:31:57+00:00","mainEntityOfPage":{"@id":"https:\/\/huongdanjava.com\/convert-java-object-json-using-jackson.html"},"wordCount":189,"commentCount":0,"publisher":{"@id":"https:\/\/huongdanjava.com\/#\/schema\/person\/dc859d7f8cbea3b593e6738de9cbb82d"},"image":{"@id":"https:\/\/huongdanjava.com\/convert-java-object-json-using-jackson.html#primaryimage"},"thumbnailUrl":"https:\/\/huongdanjava.com\/wp-content\/uploads\/2016\/09\/json.png","articleSection":["Jackson"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/huongdanjava.com\/convert-java-object-json-using-jackson.html#respond"]}]},{"@type":"WebPage","@id":"https:\/\/huongdanjava.com\/convert-java-object-json-using-jackson.html","url":"https:\/\/huongdanjava.com\/convert-java-object-json-using-jackson.html","name":"Convert Java object to JSON using Jackson - Huong Dan Java","isPartOf":{"@id":"https:\/\/huongdanjava.com\/#website"},"primaryImageOfPage":{"@id":"https:\/\/huongdanjava.com\/convert-java-object-json-using-jackson.html#primaryimage"},"image":{"@id":"https:\/\/huongdanjava.com\/convert-java-object-json-using-jackson.html#primaryimage"},"thumbnailUrl":"https:\/\/huongdanjava.com\/wp-content\/uploads\/2016\/09\/json.png","datePublished":"2018-02-18T00:04:48+00:00","dateModified":"2024-11-17T08:31:57+00:00","description":"In this tutorial, we will learn how to convert Java object to JSON using Jackson.","breadcrumb":{"@id":"https:\/\/huongdanjava.com\/convert-java-object-json-using-jackson.html#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/huongdanjava.com\/convert-java-object-json-using-jackson.html"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/huongdanjava.com\/convert-java-object-json-using-jackson.html#primaryimage","url":"https:\/\/huongdanjava.com\/wp-content\/uploads\/2016\/09\/json.png","contentUrl":"https:\/\/huongdanjava.com\/wp-content\/uploads\/2016\/09\/json.png","width":300,"height":300},{"@type":"BreadcrumbList","@id":"https:\/\/huongdanjava.com\/convert-java-object-json-using-jackson.html#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/huongdanjava.com\/"},{"@type":"ListItem","position":2,"name":"Convert Java object to JSON using Jackson"}]},{"@type":"WebSite","@id":"https:\/\/huongdanjava.com\/#website","url":"https:\/\/huongdanjava.com\/","name":"Huong Dan Java","description":"Java development tutorials","publisher":{"@id":"https:\/\/huongdanjava.com\/#\/schema\/person\/dc859d7f8cbea3b593e6738de9cbb82d"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/huongdanjava.com\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":["Person","Organization"],"@id":"https:\/\/huongdanjava.com\/#\/schema\/person\/dc859d7f8cbea3b593e6738de9cbb82d","name":"Khanh Nguyen","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/huongdanjava.com\/wp-content\/uploads\/2021\/07\/CC6FAC58-D227-4DD8-93D1-6D6A795577E3_1_201_a.jpeg","url":"https:\/\/huongdanjava.com\/wp-content\/uploads\/2021\/07\/CC6FAC58-D227-4DD8-93D1-6D6A795577E3_1_201_a.jpeg","contentUrl":"https:\/\/huongdanjava.com\/wp-content\/uploads\/2021\/07\/CC6FAC58-D227-4DD8-93D1-6D6A795577E3_1_201_a.jpeg","width":1267,"height":1517,"caption":"Khanh Nguyen"},"logo":{"@id":"https:\/\/huongdanjava.com\/wp-content\/uploads\/2021\/07\/CC6FAC58-D227-4DD8-93D1-6D6A795577E3_1_201_a.jpeg"},"description":"I love Java and everything related to Java.","sameAs":["https:\/\/huongdanjava.com","https:\/\/www.facebook.com\/nhkhanh2406","https:\/\/x.com\/https:\/\/twitter.com\/KhanhNguyenJ"]}]}},"_links":{"self":[{"href":"https:\/\/huongdanjava.com\/wp-json\/wp\/v2\/posts\/6716","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/huongdanjava.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/huongdanjava.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/huongdanjava.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/huongdanjava.com\/wp-json\/wp\/v2\/comments?post=6716"}],"version-history":[{"count":7,"href":"https:\/\/huongdanjava.com\/wp-json\/wp\/v2\/posts\/6716\/revisions"}],"predecessor-version":[{"id":23546,"href":"https:\/\/huongdanjava.com\/wp-json\/wp\/v2\/posts\/6716\/revisions\/23546"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/huongdanjava.com\/wp-json\/wp\/v2\/media\/1377"}],"wp:attachment":[{"href":"https:\/\/huongdanjava.com\/wp-json\/wp\/v2\/media?parent=6716"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/huongdanjava.com\/wp-json\/wp\/v2\/categories?post=6716"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/huongdanjava.com\/wp-json\/wp\/v2\/tags?post=6716"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}