Jlabel实现内容自动换行简单实例实现内容自动换行简单实例
主要介绍了Jlabel实现内容自动换行简单实例，具有一定借鉴价值,需要的朋友可以参考下
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());
}
}
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