几点注意:

1,ASCII码和ISO-8859-1都是单字节编码,ASCII码能表示128个字符,ISO-8859-1总共能表示256个字符。都不能表示中文,如果中文字符或其它不在IOS-8859码值范围内的字符会统一用3f表示(显示为"?", 通常所说的"黑洞");

2,GBK兼容GB2312,是双字节编码,GB2312包含6763个汉字,GBK包含21003个汉字;

3,UTF-16为定长双字节编码,大大简化了字符串的操作,但是会浪费存储空间。JAVA以UTF-16作为内存存储格式(见编码测试输出source行);

4,UTF-8采用变长,不同类型的字符可以由1~6个字节组成(汉字一般3个字节)。UTF-8规则如下:

  • 如果是1个字节,最高位(第8位)为0,则表示这是1个ASCII字符(00~7F)。可见,所有的ASCII编码已经是UTF-8了。
  • 如果是1个字节,以11开头,则连续的1的个数暗示这个字符的字节数,例如:110xxxxx代表它是双字节UTF-8字符的首字节。
  • 如果是1个字节,以10开头,表示它不是首字节,则需要向前查找才能得到当前字符的首字节。

测试代码:

package com.test.main;

public class TestCode {

    public static void encode(){
String name = "淘!我喜欢!";
toHex(name.toCharArray());
String [] codeType = {"ISO-8859-1", "GB2312", "GBK", "UTF-16", "UTF-8"};
for (String type : codeType) {
try {
byte [] bytes = name.getBytes(type);
toHex(type, bytes);
} catch (Exception e) {
e.printStackTrace();
}
}
} private static void toHex(String name, byte[] charArray) {
System.out.print(String.format("%-15s", name + ":"));
for (int i = 0; i < charArray.length; i++) {
System.out.print(String.format("%-4x ", charArray[i]));
}
System.out.println();
} private static void toHex(char[] charArray) {
System.out.print(String.format("%-15s","source:"));
for (int i = 0; i < charArray.length; i++) {
System.out.print(String.format("%-4x ", (int)charArray[i]));
}
System.out.println();
}
public static void main(String[] args) {
encode();
} }

输出:

aaarticlea/png;base64,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" alt="" />

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