本文介绍了在JOptionPane中断两行或多行中的消息的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
try {
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
String connectionUrl = "jdbc:sqlserver://"+hostName.getText()+";" +
"databaseName="+dbName.getText()+";user="+userName.getText()+";password="+password.getText()+";";
Connection con = DriverManager.getConnection(connectionUrl);
if(con!=null){JOptionPane.showMessageDialog(this, "Connection Established");}
} catch (SQLException e) {
JOptionPane.showMessageDialog(this, e);
//System.out.println("SQL Exception: "+ e.toString());
} catch (ClassNotFoundException cE) {
//System.out.println("Class Not Found Exception: "+ cE.toString());
JOptionPane.showMessageDialog(this, cE.toString());
}
当出现错误时，它显示一个长于的JOptionPane长消息框电脑屏幕的宽度。如何将e.toString（）分成两个或多个部分。
When there is an error it shows a long JOptionPane message box that is longer than the width of the computer screen. How can I break e.toString() into two or more parts.
推荐答案
import javax.swing.*;
class FixedWidthLabel {
public static void main(String[] args) {
Runnable r = () -> {
String html = "<html><body width='%1s'><h1>Label Width</h1>"
+ "<p>Many Swing components support HTML 3.2 & "
+ "(simple) CSS. By setting a body width we can cause "
+ "the component to find the natural height needed to "
+ "display the component.<br><br>"
+ "<p>The body width in this text is set to %1s pixels.";
// change to alter the width
int w = 175;
JOptionPane.showMessageDialog(null, String.format(html, w, w));
};
SwingUtilities.invokeLater(r);
}
}
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