Java character encoding problem

Coding | Question 1. about file Encoding
General file Save (text file), at the time of save by the system default language encoding (character set) to save, in the Chinese system is GBK, English system is iso8859_1, Japanese system is MS932. The same is the same as the current system default language (character set) encoding to decode, so some Chinese characters in the Japanese system will display garbled reason is this. In other words, when you open a file, different platforms use different character sets, such as the Chinese character set including A,b,c, Japanese character set including A,b, when the Japanese system decoding the Chinese character C, it will appear the so-called garbled.

2. Java Work processing Coding mode
(1) Java in the runtime will be Unicode to store characters, so that the beneficial support of the multilingual environment.
(2) Java in the reading of the file by default is in accordance with the system default language (character set) encoding to decode the file, read and save when the coding inconsistency also results in the program parameter value error, read the file with the FileInputStream class can specify the encoding read
(3) Java in the output to the System interface (Windows) will be in the memory of variable characters again through the system default language (character set) encoding to convert, so in the output process will also encounter a series of coding problems

3. The solution
(1) SWING/AWT: Output to the system interface decoding can be set by setting the component display font to replace the system character set decoding
For example:
public static void SetFont (Font pfont) {
Uimanager.put ("Button.font", Pfont);
Uimanager.put ("Togglebutton.font", Pfont);
Uimanager.put ("Radiobutton.font", Pfont);
Uimanager.put ("Checkbox.font", Pfont);
Uimanager.put ("Colorchooser.font", Pfont);
Uimanager.put ("Togglebutton.font", Pfont);
Uimanager.put ("Combobox.font", Pfont);
Uimanager.put ("Comboboxitem.font", Pfont);
Uimanager.put ("Internalframe.titlefont", Pfont);
Uimanager.put ("Label.font", Pfont);
Uimanager.put ("List.font", Pfont);
Uimanager.put ("Menubar.font", Pfont);
Uimanager.put ("Menu.font", Pfont);
Uimanager.put ("Menuitem.font", Pfont);
Uimanager.put ("Radiobuttonmenuitem.font", Pfont);
Uimanager.put ("Checkboxmenuitem.font", Pfont);
Uimanager.put ("Popupmenu.font", Pfont);
Uimanager.put ("Optionpane.font", Pfont);
Uimanager.put ("Panel.font", Pfont);
Uimanager.put ("Progressbar.font", Pfont);
Uimanager.put ("Scrollpane.font", Pfont);
Uimanager.put ("Viewport", Pfont);
Uimanager.put ("Tabbedpane.font", Pfont);
Uimanager.put ("Tableheader.font", Pfont);
Uimanager.put ("Table.font", Pfont);
Uimanager.put ("Textfield.font", Pfont);
Uimanager.put ("Passwordfiled.font", Pfont);
Uimanager.put ("Textarea.font", Pfont);
Uimanager.put ("Textpane.font", Pfont);
Uimanager.put ("Editorpane.font", Pfont);
Uimanager.put ("Titledborder.font", Pfont);
Uimanager.put ("Toolbar.font", Pfont);
Uimanager.put ("Tooltip.font", Pfont);
Uimanager.put ("Tree.font", Pfont);
}
Control the character set of the software output by passing a font name to avoid garbled

2. JSP: Can be set CharSet to solve
For example: <%@ page contenttype= "text/html;charset=gb2312"%>

3. Database: Java in the database stream will also produce coding problems, you can refer to the file method, in the receiving stream with a specific character set to decode
For example: Use Method InputStreamReader (InputStream in, Charset CS) to implement