Several common methods of obtaining file path in java
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There are several common ways to get file paths in Java. Here are some examples of how to use them and how they work.
The directory structure of test items is shown in the right figure:
1. Use the File class
File file = new File("");// Java projects-->D:\WorkSoftware\Workspace\Eclipse Projects\MyWorkspace\test// Web projects-->D:\WorkSoftware\Server\apache-tomcat-7.0.96\binSystem.out.println(file.getAbsolutePath());File file = new File("/");/ Java projects--> D: \/ Web projects-->D:\System.out.println(file.getAbsolutePath());
2. Use of environmental variables
String path = System.getProperty("user.dir");// Java projects-->D:\WorkSoftware\Workspace\Eclipse Projects\MyWorkspace\test/Web projects-->D:\WorkSoftware\Server\apache-tomcat-7.0.96\binSystem.out.println(path);
3. Use the class loader
String path = MyTest.class.getResource("").getPath();// Java project-->D:/WorkSoftware/Workspace/Eclipse Projects/MyWorkspace/test/target/classes/com/luther/test//// Web project-->D: The requested URL/webapps/test/WEB-INF/classes/com/luther/test/System.out.println(path) was not found on this server. String path = MyTest.class.getResource("/").getPath();// Java project-->D:/WorkSoftware/Workspace/Eclipse Projects/MyWorkspace/test/target/classes//// Web project-->D: The requested URL/webapps/test/WEB-INF/classes/System.out.println(path) was not found on this server. String path = MyTest.class.getClassLoader().getResource("").getPath();// Java project-->D:/WorkSoftware/Workspace/Eclipse Projects/MyWorkspace/test/target/classes//// Web project-->D:/WorkSoftware/Server/apache-tomcat-7.0.96/webapps/test/WEB-INF/classes/System.out.println(path);
summary
In Java and Web environments, it is best to use class loading to find files, which is better.
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