{"id":418,"date":"2024-08-17T19:24:55","date_gmt":"2024-08-17T22:24:55","guid":{"rendered":"https:\/\/urutaudev.com.br\/?p=418"},"modified":"2024-08-23T23:12:16","modified_gmt":"2024-08-24T02:12:16","slug":"como-ler-e-escrever-csv-com-java","status":"publish","type":"post","link":"https:\/\/urutaudev.com.br\/index.php\/2024\/08\/17\/como-ler-e-escrever-csv-com-java\/","title":{"rendered":"Como ler e escrever csv com Java"},"content":{"rendered":"<h2>Neste <a href=\"https:\/\/urutaudev.com.br\/index.php\/category\/tutorias\/\">tutorial<\/a>\u00a0 vou mostrar como\u00a0 ler e escrever csv com o <a href=\"https:\/\/urutaudev.com.br\/index.php\/category\/tutorias\/java\/\">Java<\/a>.<\/h2>\n<hr \/>\n<p>&nbsp;<\/p>\n<figure id=\"attachment_166\" aria-describedby=\"caption-attachment-166\" style=\"width: 300px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"Como ler e escrever csv com Java wp-image-166 size-full\" title=\"Como ler e escrever csv com Java\" src=\"https:\/\/urutaudev.com.br\/wp-content\/uploads\/2023\/09\/logo-java.png\" alt=\"Como ler e escrever csv com Java\" width=\"300\" height=\"200\" \/><figcaption id=\"caption-attachment-166\" class=\"wp-caption-text\">Como ler e escrever csv com Java<\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n<h4>Neste breve tutorial vou demonstrar como ler e escrever um arquivo csv com\u00a0Java.<\/h4>\n<h4>Neste post irei demonstrar como podemos \u00e9 feito a leitura e escrita de dados em um arquivo csv usando apenas fun\u00e7\u00f5es nativas do Java.<\/h4>\n<h4>Para iniciar vamos importar as depend\u00eancias que ser\u00e3o utilizadas:<\/h4>\n<p>&nbsp;<\/p>\n<div>\n<div><code>import java.io.FileWriter;<\/code><\/div>\n<div><code>import java.io.IOException;<\/code><\/div>\n<div><code>import java.io.PrintWriter;<\/code><\/div>\n<\/div>\n<p>&nbsp;<\/p>\n<p><code><\/code><\/p>\n<h4>Feito isto, vamos implementar come\u00e7ar a implementar o c\u00f3digo respons\u00e1vel escrita dos dados no arquivo csv.<\/h4>\n<div>\n<h4>Segue abaixo como ficou o c\u00f3digo:<\/h4>\n<\/div>\n<h4><\/h4>\n<div>\n<div><code>import java.io.FileWriter;<\/code><\/div>\n<div><code>import java.io.IOException;<\/code><\/div>\n<div><code>import java.io.PrintWriter;<\/code><\/div>\n<div><code>public class CSVWriterExample {<\/code><\/div>\n<div><code>\u00a0 \u00a0 public static void main(String[] args) {<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 String csvFile = \"output.csv\";<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 try (PrintWriterwriter=<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 new PrintWriter(new FileWriter(csvFile))) {<\/code><\/div>\n<div><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 writer.println(\"Nome,Idade,Cidade\");<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 writer.println(\"Jo\u00e3o,25,S\u00e3o Paulo\");<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 writer.println(\"Maria,30,Rio de Janeiro\");<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 writer.println(\"Pedro,28,Belo Horizonte\");<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 System.out.println(\"Arquivo CSV criado com sucesso!\");<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 } catch (IOException e) {<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 e.printStackTrace();<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 }<\/code><\/div>\n<div><code>\u00a0 \u00a0 }<\/code><\/div>\n<div><code>}<\/code><\/div>\n<\/div>\n<p>&nbsp;<\/p>\n<h4>Uma breve explica\u00e7\u00e3o do c\u00f3digo acima:<\/h4>\n<ul>\n<li>No c\u00f3digo acima \u00e9 definido primeiro o nome do aquivo que ser\u00e1 gerado;<\/li>\n<li>Depois instancio\u00a0 a classe <strong>PrintWriter<\/strong> passando uma inst\u00e2ncia do<strong> FileWriter<\/strong>, para criar o arquivo onde ser\u00e1 escrito os dados;<\/li>\n<li>Logo ap\u00f3s \u00e9 realizado a escrita das informa\u00e7\u00f5es com a fun\u00e7\u00e3o (<strong>println)<\/strong> da classe (PrintWriter).<\/li>\n<\/ul>\n<h4><\/h4>\n<p>&nbsp;<\/p>\n<h4>Ao rodar o c\u00f3digo acima ser\u00e1 gerado um arquivo csv (<code>output.csv<\/code>) com as informa\u00e7\u00f5es passadas:<\/h4>\n<p><code>Nome,Idade,Cidade<\/code><br \/>\n<code>Jo\u00e3o,25,S\u00e3o Paulo<\/code><br \/>\n<code>Maria,30,Rio de Janeiro<\/code><br \/>\n<code>Pedro,23,Minas Gerais<\/code><\/p>\n<div id=\"list_id_8_0\" class=\"monaco-list-row\" role=\"treeitem\" draggable=\"false\" data-index=\"0\" data-last-element=\"false\" data-parity=\"even\" aria-setsize=\"2\" aria-posinset=\"1\" aria-selected=\"false\" aria-label=\"List Resultado Agrupado: \" aria-level=\"1\">\n<div class=\"monaco-tl-row\">\n<div class=\"monaco-tl-contents output\">\n<div class=\"output expression value-and-source\">\n<div id=\"list_id_6_0\" class=\"monaco-list-row\" role=\"treeitem\" draggable=\"false\" data-index=\"0\" data-last-element=\"false\" data-parity=\"even\" aria-setsize=\"2\" aria-posinset=\"1\" aria-selected=\"false\" aria-label=\"4 \" aria-level=\"1\">\n<div class=\"monaco-tl-row\">\n<div class=\"monaco-tl-contents output\">\n<div class=\"output expression value-and-source\">\n<div id=\"list_id_6_0\" class=\"monaco-list-row\" role=\"treeitem\" draggable=\"false\" data-index=\"0\" data-last-element=\"false\" data-parity=\"even\" aria-setsize=\"2\" aria-posinset=\"1\" aria-selected=\"false\" aria-label=\"4 \" aria-level=\"1\">\n<div class=\"monaco-tl-row\">\n<div class=\"monaco-tl-contents output\">\n<div class=\"output expression value-and-source\"><code><\/code><code><\/code><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div>\n<div><code><\/code><\/div>\n<\/div>\n<h4><\/h4>\n<h4>Segue abaixo um pequeno v\u00eddeo onde demonstro o processo e implementa\u00e7\u00e3o do c\u00f3digo usado no <a href=\"https:\/\/urutaudev.com.br\/index.php\/category\/tutorias\/\">tutorial<\/a> :<\/h4>\n<p>&nbsp;<\/p>\n<p><iframe loading=\"lazy\" title=\"Como escrever arquivo csv  no Java - Dicas R\u00e1pidas #coding\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/Snr4EL_Bd3g?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<h4><\/h4>\n<p>&nbsp;<\/p>\n<h4>Agora vem a parte da leitura do arquivo que foi gerado, segue abaixo o c\u00f3digo implementado para leitura do arquivo:<\/h4>\n<p>&nbsp;<\/p>\n<div>\n<div><code>import java.io.BufferedReader;<\/code><\/div>\n<div><code>import java.io.FileReader;<\/code><\/div>\n<div><code>import java.io.IOException;<\/code><\/div>\n<div><code>public class CSVReaderExample {<\/code><\/div>\n<div><code>\u00a0 \u00a0 public static void main(String[] args) {<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 String csvFile = \"output.csv\";<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 String line;<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 String csvSeparator = \",\";<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 try (BufferedReader reader = new BufferedReader(new FileReader(csvFile))) {<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 if ((line = reader.readLine()) != null) {<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 System.out.println(\"Cabe\u00e7alho: \" + line);<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 while ((line = reader.readLine()) != null) {<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 String[] data = line.split(csvSeparator);<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 String nome = data[0];<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 String idade = data[1];<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 String cidade = data[2];<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 System.out.println(\"Nome: \" + nome + \", Idade: \" + idade + \", Cidade: \" + cidade);<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 }<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 } catch (IOException e) {<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 e.printStackTrace();<\/code><\/div>\n<div><code>\u00a0 \u00a0 \u00a0 \u00a0 }<\/code><\/div>\n<div><code>\u00a0 \u00a0 }<\/code><\/div>\n<div><code>}<\/code><\/div>\n<\/div>\n<h4><\/h4>\n<h4>Uma breve explica\u00e7\u00e3o do c\u00f3digo acima:<\/h4>\n<ul>\n<li>No c\u00f3digo acima \u00e9 definido primeiro o nome do aquivo que ser\u00e1 lido;<\/li>\n<li>Depois instancio\u00a0 a classe <strong>BufferedReader<\/strong> passando uma inst\u00e2ncia do<strong> FileReader<\/strong>, para ler arquivo csv;<\/li>\n<li>Logo ap\u00f3s \u00e9 realizo a leitura do arquivo percorrendo cada linha e exibindo as informa\u00e7\u00f5es no terminal;<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h4>Quando executamos\u00a0 o c\u00f3digo acima ser\u00e1 exibido no terminal as \u00a0informa\u00e7\u00f5es abaixos:<\/h4>\n<p>&nbsp;<\/p>\n<div id=\"list_id_5_0\" class=\"monaco-list-row\" role=\"treeitem\" draggable=\"false\" data-index=\"0\" data-last-element=\"false\" data-parity=\"even\" aria-setsize=\"4\" aria-posinset=\"1\" aria-selected=\"false\" aria-label=\"Cabe\u00e7alho: Nome,Idade,Cidade \" aria-level=\"1\">\n<div class=\"monaco-tl-row\">\n<div class=\"monaco-tl-contents output\">\n<div class=\"output expression value-and-source\"><code><span class=\"value info\"><span class=\"\">Cabe\u00e7alho: Nome,Idade,Cidade<\/span><\/span><\/code><\/div>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"list_id_5_1\" class=\"monaco-list-row\" role=\"treeitem\" draggable=\"false\" data-index=\"1\" data-last-element=\"false\" data-parity=\"odd\" aria-setsize=\"4\" aria-posinset=\"2\" aria-selected=\"false\" aria-label=\"Nome: Jo\u00e3o, Idade: 25, Cidade: S\u00e3o Paulo \" aria-level=\"1\">\n<div class=\"monaco-tl-row\">\n<div class=\"monaco-tl-contents output\">\n<div class=\"output expression value-and-source\"><code><span class=\"value info\"><span class=\"\">Nome: Jo\u00e3o, Idade: 25, Cidade: S\u00e3o Paulo<\/span><\/span><\/code><\/div>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"list_id_5_2\" class=\"monaco-list-row\" role=\"treeitem\" draggable=\"false\" data-index=\"2\" data-last-element=\"false\" data-parity=\"even\" aria-setsize=\"4\" aria-posinset=\"3\" aria-selected=\"false\" aria-label=\"Nome: Maria, Idade: 30, Cidade: Rio de Janeiro \" aria-level=\"1\">\n<div class=\"monaco-tl-row\">\n<div class=\"monaco-tl-contents output\">\n<div class=\"output expression value-and-source\"><code><span class=\"value info\"><span class=\"\">Nome: Maria, Idade: 30, Cidade: Rio de Janeiro<\/span><\/span><\/code><\/div>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"list_id_5_3\" class=\"monaco-list-row\" role=\"treeitem\" draggable=\"false\" data-index=\"3\" data-last-element=\"true\" data-parity=\"odd\" aria-setsize=\"4\" aria-posinset=\"4\" aria-selected=\"false\" aria-label=\"Nome: Pedro, Idade: 23, Cidade: Minas Gerais \" aria-level=\"1\">\n<div class=\"monaco-tl-row\">\n<div class=\"monaco-tl-contents output\">\n<div class=\"output expression value-and-source\"><code><span class=\"value info\"><span class=\"\">Nome: Pedro, Idade: 23, Cidade: Minas Gerais<\/span><\/span><\/code><\/div>\n<div><\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>&nbsp;<\/p>\n<h4>Deixo aqui um pequeno curto v\u00eddeo da implementa\u00e7\u00e3o do c\u00f3digo de leitura de arquivo csv:<\/h4>\n<p>&nbsp;<\/p>\n<p><iframe loading=\"lazy\" title=\"Como ler arquivo csv  no Java - Dicas R\u00e1pidas #coding\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/z8aBk0EZwIA?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<h4>Caso queira acompanhar todo o processo de desenvolvimento deixo abaixo o link para o v\u00eddeo no Youtube:<\/h4>\n<p>&nbsp;<\/p>\n<p><iframe loading=\"lazy\" title=\"Como ler e escrever arquivo csv no Java #coding #code\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/5c3euKJbOag?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<h4 style=\"text-align: left;\">Abaixo segue link do Github com o c\u00f3digo fonte que utilizei\u00a0 para implementa\u00e7\u00e3o deste tutorial:<\/h4>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/github.com\/JrDevCJ\/java-tutorial\/blob\/main\/Utils\/CSVWriterExample.java\">C\u00f3digo Fonte CSVWriter<\/a><\/p>\n<p><a href=\"https:\/\/github.com\/JrDevCJ\/java-tutorial\/blob\/main\/Utils\/CSVReaderExample.java\">C\u00f3digo Fonte CSVReader<\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Neste tutorial\u00a0 vou mostrar como\u00a0 ler e escrever csv com o Java. &nbsp; &nbsp; Neste breve tutorial vou demonstrar como<\/p>\n","protected":false},"author":1,"featured_media":166,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[1,13,5],"tags":[89,22,88,21,18],"class_list":["post-418","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-java","category-tutorias","tag-csv","tag-java","tag-ler-arquivo","tag-spring","tag-tutorias"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Como ler e escrever csv com Java - UrutauDev<\/title>\n<meta name=\"description\" content=\"Neste breve tutorial vou demonstrar como ler e escrever um arquivo csv com\u00a0Java, utilizando apenas fun\u00e7\u00f5es nativas.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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