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:
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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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原文链接:http://blog.csdn.net/zhhtao89/article/details/50179695