{"id":18572,"date":"2024-03-15T17:14:19","date_gmt":"2024-03-15T17:14:19","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-read-and-write-properties-configuration-files-in-java\/"},"modified":"2024-03-21T13:37:42","modified_gmt":"2024-03-21T13:37:42","slug":"how-to-read-and-write-properties-configuration-files-in-java","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-read-and-write-properties-configuration-files-in-java\/","title":{"rendered":"How to read and write Properties configuration files in Java?"},"content":{"rendered":"<p>In Java, you can use the java.util.Properties class to read and write Properties configuration files. Here is a simple example:<\/p>\n<p>Read the configuration file.<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> java.io.FileInputStream;\r\n<span class=\"hljs-keyword\">import<\/span> java.io.IOException;\r\n<span class=\"hljs-keyword\">import<\/span> java.util.Properties;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">PropertiesExample<\/span> {\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> {\r\n        <span class=\"hljs-type\">Properties<\/span> <span class=\"hljs-variable\">properties<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Properties<\/span>();\r\n        <span class=\"hljs-keyword\">try<\/span> {\r\n            <span class=\"hljs-comment\">\/\/ \u52a0\u8f7d\u914d\u7f6e\u6587\u4ef6<\/span>\r\n            <span class=\"hljs-type\">FileInputStream<\/span> <span class=\"hljs-variable\">fileInputStream<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">FileInputStream<\/span>(<span class=\"hljs-string\">\"config.properties\"<\/span>);\r\n            properties.load(fileInputStream);\r\n            fileInputStream.close();\r\n\r\n            <span class=\"hljs-comment\">\/\/ \u8bfb\u53d6\u914d\u7f6e\u9879<\/span>\r\n            <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">username<\/span> <span class=\"hljs-operator\">=<\/span> properties.getProperty(<span class=\"hljs-string\">\"username\"<\/span>);\r\n            <span class=\"hljs-type\">String<\/span> <span class=\"hljs-variable\">password<\/span> <span class=\"hljs-operator\">=<\/span> properties.getProperty(<span class=\"hljs-string\">\"password\"<\/span>);\r\n\r\n            System.out.println(<span class=\"hljs-string\">\"Username: \"<\/span> + username);\r\n            System.out.println(<span class=\"hljs-string\">\"Password: \"<\/span> + password);\r\n\r\n        } <span class=\"hljs-keyword\">catch<\/span> (IOException e) {\r\n            e.printStackTrace();\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>Write to the configuration file:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> java.io.FileOutputStream;\r\n<span class=\"hljs-keyword\">import<\/span> java.io.IOException;\r\n<span class=\"hljs-keyword\">import<\/span> java.util.Properties;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">PropertiesExample<\/span> {\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">main<\/span><span class=\"hljs-params\">(String[] args)<\/span> {\r\n        <span class=\"hljs-type\">Properties<\/span> <span class=\"hljs-variable\">properties<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Properties<\/span>();\r\n        <span class=\"hljs-keyword\">try<\/span> {\r\n            <span class=\"hljs-comment\">\/\/ \u8bbe\u7f6e\u914d\u7f6e\u9879<\/span>\r\n            properties.setProperty(<span class=\"hljs-string\">\"username\"<\/span>, <span class=\"hljs-string\">\"admin\"<\/span>);\r\n            properties.setProperty(<span class=\"hljs-string\">\"password\"<\/span>, <span class=\"hljs-string\">\"123456\"<\/span>);\r\n\r\n            <span class=\"hljs-comment\">\/\/ \u4fdd\u5b58\u914d\u7f6e\u6587\u4ef6<\/span>\r\n            <span class=\"hljs-type\">FileOutputStream<\/span> <span class=\"hljs-variable\">fileOutputStream<\/span> <span class=\"hljs-operator\">=<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">FileOutputStream<\/span>(<span class=\"hljs-string\">\"config.properties\"<\/span>);\r\n            properties.store(fileOutputStream, <span class=\"hljs-literal\">null<\/span>);\r\n            fileOutputStream.close();\r\n\r\n            System.out.println(<span class=\"hljs-string\">\"Config file saved successfully.\"<\/span>);\r\n\r\n        } <span class=\"hljs-keyword\">catch<\/span> (IOException e) {\r\n            e.printStackTrace();\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>In the above example, assuming the configuration file is named config.properties and contains the following:<\/p>\n<pre class=\"post-pre\"><code>username=admin\r\npassword=123456\r\n<\/code><\/pre>\n<p>When reading a configuration file, use the load method of the Properties class to load the file stream and use the getProperty method to retrieve the value of the configuration item.<\/p>\n<p>When writing to a configuration file, use the setProperty method of the Properties class to set the value of configuration items, and use the store method to save it to the file.<\/p>\n<p>Please note that when reading and writing configuration files, IOException exceptions need to be handled. Additionally, the path to the configuration file can be adjusted according to the actual situation.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In Java, you can use the java.util.Properties class to read and write Properties configuration files. Here is a simple example: Read the configuration file. import java.io.FileInputStream; import java.io.IOException; import java.util.Properties; public class PropertiesExample { public static void main(String[] args) { Properties properties = new Properties(); try { \/\/ \u52a0\u8f7d\u914d\u7f6e\u6587\u4ef6 FileInputStream fileInputStream = new FileInputStream(&#8220;config.properties&#8221;); properties.load(fileInputStream); [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-18572","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to read and write Properties configuration files in Java? - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/how-to-read-and-write-properties-configuration-files-in-java\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to read and write Properties configuration files in Java?\" \/>\n<meta property=\"og:description\" content=\"In Java, you can use the java.util.Properties class to read and write Properties configuration files. Here is a simple example: Read the configuration file. import java.io.FileInputStream; import java.io.IOException; import java.util.Properties; public class PropertiesExample { public static void main(String[] args) { Properties properties = new Properties(); try { \/\/ \u52a0\u8f7d\u914d\u7f6e\u6587\u4ef6 FileInputStream fileInputStream = new FileInputStream(&quot;config.properties&quot;); properties.load(fileInputStream); [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-to-read-and-write-properties-configuration-files-in-java\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/SiliCloudGlobal\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-15T17:14:19+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-21T13:37:42+00:00\" \/>\n<meta name=\"author\" content=\"William Carter\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:site\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"William Carter\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-read-and-write-properties-configuration-files-in-java\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-read-and-write-properties-configuration-files-in-java\/\"},\"author\":{\"name\":\"William Carter\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/f697031891aacefc4b681d139781d3c0\"},\"headline\":\"How to read and write Properties configuration files in Java?\",\"datePublished\":\"2024-03-15T17:14:19+00:00\",\"dateModified\":\"2024-03-21T13:37:42+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-read-and-write-properties-configuration-files-in-java\/\"},\"wordCount\":150,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\"},\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-to-read-and-write-properties-configuration-files-in-java\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/how-to-read-and-write-properties-configuration-files-in-java\/\",\"name\":\"How to read and write Properties configuration files in Java? 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