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Java实现读取项目中文件(.json或.properties)的方法详解

作者：百世经纶『一页書』　　发布时间：2022-08-12 23:59:10　

标签：Java,读取,文件

1. 读取json file

1.1 Json dependency

<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.76</version>
</dependency>

1.2 字节流

重点部分

public class FileService {

public JSONObject reader(){

JSONObject resultJson = null;
String file = "src/main/resources/config_dev.json";
InputStream is = null;
try {
is = new FileInputStream(file);//操作
byte[] bytes = new byte[5000];//数组容量超级大，一次能将中英混合文本全部读取完
int len = -1;
while ((len = is.read(bytes)) != -1) {
String str = new String(bytes, 0, len, "UTF-8");
resultJson = process(str);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {//释放资源
try {
if (null != is) {
is.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return resultJson;
}

private static JSONObject process(String content) {

JSONObject json = JSONObject.parseObject(content);
return json;
}
}

1.3 buffer reader

public static String reader(String filePath) {
try {
File file = new File(filePath);
if (file.isFile() && file.exists()) {
InputStreamReader read = new InputStreamReader(new FileInputStream(file), "UTF-8");
BufferedReader bufferedReader = new BufferedReader(read);
String lineTxt = bufferedReader.readLine();
while (lineTxt != null) {
return lineTxt;
}
}
} catch (UnsupportedEncodingException | FileNotFoundException e) {
System.out.println("Cannot find the file specified!");
e.printStackTrace();
} catch (IOException e) {
System.out.println("Error reading file content!");
e.printStackTrace();
}
return null;
}

2. 读取properties file

public void readPropertiesFile() {

Properties pro = new Properties();

InputStream is = this.getClass().getResourceAsStream("/application.properties");
try {
pro.load(is);

Enumeration en = pro.propertyNames();

while (en.hasMoreElements()) {
String key = (String) en.nextElement();
String value = pro.getProperty(key);
System.out.println(key + "--" + value);
}
} catch (IOException e) {
throw new RuntimeException(e);
}

}

3. 好看的css样式

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<link rel="stylesheet" href="https://qxhut.cn/zb_users/plugin/Jz52_click/click.css">
<script src="https://qxhut.cn/zb_users/plugin/Jz52_click/click.js"></script>
<h1>Click Style</h1>
</body>
</html>

来源：https://blog.csdn.net/weixin_43916074/article/details/129883052

投稿

Java实现读取项目中文件(.json或.properties)的方法详解

1. 读取json file

1.1 Json dependency

1.2 字节流

1.3 buffer reader

2. 读取properties file

3. 好看的css样式

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