我在尝试在 java 中使用 unicode 显示印地语字符时遇到问题，例如
例如：字符串 s="\u2345\u2346\u2347"; // 完美显示字符
但是当我从 db 获取这些代码然后尝试显示它们时，这些只是显示为代码本身而不是印地语字符。
这是我的代码：
package nayak;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.StringTokenizer;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.WindowConstants;
import javax.swing.border.LineBorder;
import org.omg.CORBA.portable.ValueOutputStream;
/* DB : hexadecimalcode
* Table : en_hin
* +---------------+---------------+--------------+---------------+
* | char_en | char_hi | html_code | hex_code |
* +---------------+---------------+--------------+---------------+
* | A | ? | अ | अ |
* +---------------+---------------+--------------+---------------+
* | AA | ? | आ | आ |
* +---------------+---------------+--------------+---------------+
*/
public class UnicodeToHexcode extends javax.swing.JFrame {
private JLabel lblUnicode;
private JTextField jtextf_unicode;
private JTextField jtextf_hexcode;
private JButton jcb_getcode;
private JLabel lblHexcode;
Connection con = null;
private JButton jcb_clear;
private JScrollPane jscrollpane_result;
private JTextArea jtextarea_result;
String driverString="net.sourceforge.jtds.jdbc.Driver";
String sqlString = "jdbc:jtds:sqlserver://mitu:1433/hexadecimalcode";
String sqlUsername="hms";
String sqlPassword="hms";
Statement st=null;
ResultSet rs=null;
{
//Set Look & Feel
try {
javax.swing.UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsClassicLookAndFeel");
} catch(Exception e) {
e.printStackTrace();
}
}
/**
* Auto-generated main method to display this JFrame
*/
public static void main(String[] args) {
UnicodeToHexcode inst = new UnicodeToHexcode();
inst.setVisible(true);
}
public UnicodeToHexcode() {
super();
initGUI();
}
private void initGUI() {
try {
setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
getContentPane().setLayout(null);
this.setTitle("Unicode to Hexadecinal code Converter by Nayak");
getContentPane().setBackground(new java.awt.Color(255,255,255));
{
lblUnicode = new JLabel();
getContentPane().add(lblUnicode);
lblUnicode.setText("Unicode");
lblUnicode.setBounds(10, 23, 63, 21);
lblUnicode.setFont(new java.awt.Font("Verdana",0,12));
}
{
jtextf_unicode = new JTextField();
getContentPane().add(jtextf_unicode);
jtextf_unicode.setBounds(10, 42, 462, 28);
jtextf_unicode.setFont(new java.awt.Font("Verdana",0,12));
jtextf_unicode.setBackground(new java.awt.Color(255,231,193));
jtextf_unicode.addKeyListener(new KeyAdapter() {
public void keyPressed(KeyEvent evt) {
jtextf_unicodeKeyPressed(evt);
}
});
}
{
lblHexcode = new JLabel();
getContentPane().add(lblHexcode);
lblHexcode.setText("Hexcode");
lblHexcode.setBounds(10, 191, 63, 19);
lblHexcode.setFont(new java.awt.Font("Verdana",0,12));
}
{
jtextf_hexcode = new JTextField();
getContentPane().add(jtextf_hexcode);
jtextf_hexcode.setBounds(10, 210, 462, 28);
jtextf_hexcode.setFont(new java.awt.Font("Verdana",0,12));
jtextf_hexcode.setBackground(new java.awt.Color(255,231,193));
}
{
jcb_getcode = new JButton();
getContentPane().add(jcb_getcode);
jcb_getcode.setText("Get Code");
jcb_getcode.setBounds(10, 76, 155, 49);
jcb_getcode.setFont(new java.awt.Font("Arial Unicode MS",1,16));
jcb_getcode.setBackground(new java.awt.Color(0,0,255));
jcb_getcode.setBorder(BorderFactory.createCompoundBorder(
new LineBorder(new java.awt.Color(128,128,128), 1, false),
new LineBorder(new java.awt.Color(192,192,192), 1, false)));
jcb_getcode.setForeground(new java.awt.Color(255,255,255));
jcb_getcode.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
jcb_getcodeActionPerformed(evt);
}
});
}
{
jscrollpane_result = new JScrollPane();
getContentPane().add(jscrollpane_result);
jscrollpane_result.setBounds(179, 81, 293, 104);
jscrollpane_result.setAutoscrolls(true);
{
jtextarea_result = new JTextArea();
jscrollpane_result.setViewportView(jtextarea_result);
jtextarea_result.setBounds(10, 202, 72, 23);
jtextarea_result.setFont(new java.awt.Font("Dialog",0,20));
jtextarea_result.setEditable(false);
jtextarea_result.setRows(3);
jtextarea_result.setPreferredSize(new java.awt.Dimension(442, 36));
}
}
{
jcb_clear = new JButton();
getContentPane().add(jcb_clear);
jcb_clear.setText("Clear");
jcb_clear.setBounds(10, 136, 155, 49);
jcb_clear.setFont(new java.awt.Font("Arial Unicode MS",1,16));
jcb_clear.setBorder(BorderFactory.createCompoundBorder(
new LineBorder(new java.awt.Color(128,128,128), 1, false),
new LineBorder(new java.awt.Color(192,192,192), 1, false)));
jcb_clear.setBackground(new java.awt.Color(0,0,255));
jcb_clear.setForeground(new java.awt.Color(255,255,255));
jcb_clear.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
jcb_clearActionPerformed(evt);
}
});
}
pack();
this.setSize(490, 278);
postInitGUI();
} catch (Exception e) {
e.printStackTrace();
}
}
public void postInitGUI(){
stayCentered();
}
public void stayCentered(){
double s_height,s_width,f_height,f_width,f_x,f_y;
f_height=this.getHeight();
f_width=this.getWidth();
Dimension screenSize = this.getToolkit().getScreenSize();
s_height=screenSize.getHeight();
s_width=screenSize.getWidth();
f_x=(s_width/2)-(f_width/2);
f_y=(s_height/2)-(f_height/2);
Double d= new Double(f_x);
int fr_x=d.intValue();
d= new Double(f_y);
int fr_y=d.intValue();
this.setLocation(fr_x, fr_y);
}
public boolean isNumber(String input){
boolean res=false;
int input_no=0;
try {
input_no=Integer.parseInt(input);
System.out.println("Input_no: "+input_no);
if(input_no>0 && input_no<9999)
res= true;
else
res= false;
} catch (Exception e) {
res= false;
}
return res;
}
public boolean checkTextfield_unicode(String input_text){
boolean res=false;
if(input_text.equalsIgnoreCase("")){
System.out.println("jtextf_unicode: "+input_text);
JOptionPane.showMessageDialog(this, "Enter Unicode !!!");
clear();
res=false;
}else{
StringTokenizer input_text_splitted = new StringTokenizer(input_text,";");
while (input_text_splitted.hasMoreTokens()) {
String txt=input_text_splitted.nextToken();
if(!(txt.substring(0,2).equalsIgnoreCase("&#"))){
System.out.println("jtextf_unicode: "+txt.substring(0,2));
JOptionPane.showMessageDialog(this, "Enter Correct Unicode !!!\nCode format: &#<4-digit no.>;");
clear();
res=false;
}else if(txt.substring(2).length()<4){
System.out.println("jtextf_unicode: "+txt.substring(2));
JOptionPane.showMessageDialog(this, "Enter Correct Unicode !!!\nCode format: &#<4-digit no.>;\n");
clear();
res=false;
}else if(!(isNumber(txt.substring(2)))){
System.out.println("jtextf_unicode: No Number");
JOptionPane.showMessageDialog(this, "Enter Correct Unicode !!!\nCode format: &#<4-digit no.>;\n");
clear();
res=false;
}else{
res=true;
}
}
}
return res;
}
public void clear(){
jtextf_unicode.setText("");
jtextf_hexcode.setText("");
jtextarea_result.setText("");
jtextf_unicode.requestFocus();
}
public Connection getConnection(){
// --- connect to DB ---
try{
// --- Step 1: Set Driver url ---
Class.forName(driverString);
// --- Step 2: Set Sql Server url ---
con = DriverManager.getConnection(sqlString,sqlUsername,sqlPassword);
System.out.println("...... DB Connection Successful ......");
// --- Step 3: Fetch Data ---
}catch (Exception e) {
System.out.println("...... DB Connection Failed ......");
e.printStackTrace();
}
return con;
}
public String getData(String query){
String output="";
con=getConnection();
try {
st = con.createStatement();
rs = st.executeQuery(query);
while (rs.next()) {
String htm=rs.getString(1);
String hex=rs.getString(2);
System.out.println("--> "+htm+" - "+hex);
String hex_1=hex.substring(3,7);
System.out.println("--> hex_1: "+hex_1);
hex_1="\\u"+hex_1;
System.out.println("--> hex_1: "+hex_1);
output+=hex_1.trim();
}
} catch (SQLException e) {
e.printStackTrace();
}
return output;
}
private void jtextf_unicodeKeyPressed(KeyEvent evt) {
char c=evt.getKeyChar();
String txt=jtextf_unicode.getText().toString().trim();
if(c==KeyEvent.VK_ENTER){
if(checkTextfield_unicode(txt)){
jcb_getcode.requestFocus();
}
}
}
private void jcb_getcodeActionPerformed(ActionEvent evt) {
String unicd=jtextf_unicode.getText().trim();
System.out.println("@@@unicode: "+unicd);
String hex_all="";
if(checkTextfield_unicode(unicd)){
StringTokenizer cod_all = new StringTokenizer(unicd,";");
while (cod_all.hasMoreTokens()) {
String cod_single=cod_all.nextToken();
System.out.println("***cod_single: "+cod_single+";");
cod_single+=";";
String query="select html_code,hex_code " +
" from en_hin " +
" where html_code='"+cod_single.trim()+"'";
hex_all+=getData(query);
System.out.println("@@@Hex code: "+hex_all);
jtextf_hexcode.setText(hex_all.trim());
//hex_all="\u0917\u0941\u0923\u0935\u0924"; //<--- if u uncomment it shows Hindi texts
jtextarea_result.setText(hex_all); //<--- but here same code from db doesn't show, why?
}
jcb_clear.requestFocus();
}
}
private void jcb_clearActionPerformed(ActionEvent evt) {
clear();
}
}
任何人都可以告诉错误在哪里？