java -Dfile.encoding

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本文通过实验展示了在不同编码环境下输入文本并保存到文件的效果，对比了GBK与UTF-8编码在处理中文和非英文字符时的表现。

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public static void main(String[] args) throws Exception {
//		gbk();//-Dfile.encoding=gbk 1.txt(gbk,正常)gbk1.txt(gbk,正常) utf81.txt(utf-8, 乱码)
//		utf8();//-Dfile.encoding=utf-8 2.txt(utf-8,乱码) gbk2.txt(gbk,乱码) utf81.txt(utf-8, 乱码)
		utf8_();//-Dfile.encoding=utf-8 3.txt(utf-8,乱码) gbk3.txt(gbk,乱码) utf83.txt(utf-8, 乱码)
	}
	
	static void gbk()  throws Exception{
		System.out.println(System.getProperty("file.encoding"));
		//file.encoding=GBK
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String str1 = br.readLine();
		
		FileWriter fw = new FileWriter("1.txt");
		fw.write(str1);
		fw.close();
		
		OutputStreamWriter gbk1 = new OutputStreamWriter(new FileOutputStream("gbk1.txt"), "gbk");
		gbk1.write(str1);
		gbk1.close();
		
		OutputStreamWriter utf81 = new OutputStreamWriter(new FileOutputStream("utf81.txt"), "utf-8");
		utf81.write(str1);
		utf81.close();
	}
	
	static void utf8()  throws Exception{
		System.out.println(System.getProperty("file.encoding"));
		
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String str2 = br.readLine();
		
		FileWriter fw = new FileWriter("2.txt");
		fw.write(str2);
		fw.close();
	
		OutputStreamWriter gbk2 = new OutputStreamWriter(new FileOutputStream("gbk2.txt"), "gbk");
		gbk2.write(str2);
		gbk2.close();
		
		OutputStreamWriter utf82 = new OutputStreamWriter(new FileOutputStream("utf82.txt"), "utf-8");
		utf82.write(str2);
		utf82.close();
	}
	
	static void utf8_()  throws Exception{
		System.out.println(System.getProperty("file.encoding"));
		
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in,"UTF-8"));
		String str3 = br.readLine();
		
		FileWriter fw = new FileWriter("3.txt");
		fw.write(str3);
		fw.close();
	
		OutputStreamWriter gbk3 = new OutputStreamWriter(new FileOutputStream("gbk3.txt"), "gbk");
		gbk3.write(str3);
		gbk3.close();
		
		OutputStreamWriter utf83 = new OutputStreamWriter(new FileOutputStream("utf83.txt"), "utf-8");
		utf83.write(str3);
		utf83.close();
	}

http://www.worlduc.com/blog2012.aspx?bid=5766849

http://blog.youkuaiyun.com/yangyan19870319/article/details/6131918