linux查看本机jdk的编码方式

1.创建java文件

[root@test opt]# cat Test.java
import java.io.ByteArrayOutputStream;
import java.io.OutputStreamWriter;
import java.nio.charset.Charset;

class Test {
        public static void main(String[] args) {
        System.out.println("Default Charset=" + Charset.defaultCharset());
        System.out.println("file.encoding=" + System.getProperty("file.encoding"));
        System.out.println("Default Charset=" + Charset.defaultCharset());
        System.out.println("Default Charset in Use=" + getDefaultCharSet());
    }

    private static String getDefaultCharSet() {
        OutputStreamWriter writer = new OutputStreamWriter(new ByteArrayOutputStream());
        String enc = writer.getEncoding();
        return enc;
    }

}

2. 编译文件为class

[root@test opt]# javac Test.java -d .

3.创建入口主函数

在同一目录

[root@test opt]# cat manifest.txt
Main-class: Test

4.打包成jar包执行函数

打包

[root@test opt]# jar cvfm Test.jar manifest.txt Test.class
added manifest
adding: Test.class(in = 1188) (out= 625)(deflated 47%)

执行

[root@test opt]# java -jar Test.jar
Default Charset=UTF-8
file.encoding=UTF-8
Default Charset=UTF-8
Default Charset in Use=UTF8