在用javaSwing写界面时,想实现JLabel中的文本内容自动换行,网上查了一下,大多是一些比较简单的加个换行而已,于是自己写了一个函数,现在贴出了供大家学习。
效果图如下:
代码如下:
package com.zht;import java.awt.BorderLayout;import java.awt.Dimension;import java.awt.FlowLayout;import java.awt.FontMetrics;import java.util.concurrent.TimeUnit;import javax.swing.JFrame;import javax.swing.JLabel;public class JLabelDemo extends JFrame {public static void main(String[] args) throws InterruptedException {System.out.println("hello");JLabelDemo jLabelDemo = new JLabelDemo();}public JLabelDemo() throws InterruptedException {String text = "This space contains technical articles," + " blogs and discussion forums with questions and answers." + "作为一个Java程序员,从论坛上感受到使用Java开发程序的人越来多," + "心中不免欣慰。hello";JLabel label = new JLabel();label.setSize(200, 0);//注意JLabel一定要设置宽度// System.out.println(label.getWidth());JlabelSetText(label, text);setLayout(new FlowLayout());add(label);pack();// setSize(300, 200);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);setLocationRelativeTo(null);setVisible(true);}void JlabelSetText(JLabel jLabel, String longString) throws InterruptedException {StringBuilder builder = new StringBuilder("<html>");char[] chars = longString.toCharArray();FontMetrics fontMetrics = jLabel.getFontMetrics(jLabel.getFont());int start = 0;int len = 0;while (start + len < longString.length()) {while (true) {len++;if (start + len > longString.length())break;if (fontMetrics.charsWidth(chars, start, len) > jLabel.getWidth()) {break;}}builder.append(chars, start, len-1).append("<br/>");start = start + len - 1;len = 0;}builder.append(chars, start, longString.length()-start);builder.append("</html>");jLabel.setText(builder.toString());}}总结
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