聊天室客-GUI.rar

package my; import java.util.ArrayList; import java.util.List; import javax.swing.JTextPane; import javax.swing.text.BadLocationException; import javax.swing.text.Style; import javax.swing.text.StyleConstants; import javax.swing.text.StyleContext; import javax.swing.text.StyledDocument; import org.json.JSONObject; public class MsgBox extends JTextPane { List<Item> itemList = new ArrayList<>(); public MsgBox() { initDocStyle(this.getStyledDocument()); this.setEditable(false); } // 添加几个样式 name, time, content private void initDocStyle(StyledDocument doc) { Style def = StyleContext.getDefaultStyleContext(). getStyle(StyleContext.DEFAULT_STYLE); if(true) { Style s = doc.addStyle("name", def); StyleConstants.setFontFamily(s, "宋体"); StyleConstants.setBold(s, true); StyleConstants.setFontSize(s, 12); } if(true) { Style s = doc.addStyle("time", def); StyleConstants.setFontFamily(s, "宋体"); StyleConstants.setBold(s, true); StyleConstants.setFontSize(s, 12); } if(true) { Style s = doc.addStyle("content", def); StyleConstants.setFontFamily(s, "宋体"); StyleConstants.setBold(s, false); StyleConstants.setFontSize(s, 14); } } // 添加一条消息 public void appendMessage(JSONObject msg) { String name = msg.optString("name", ""); String time = msg.optString("time", ""); String content = msg.optString("content", ""); StyledDocument doc = getStyledDocument(); try { Item item = new Item(); String text = name; doc.insertString(doc.getLength(), text, doc.getStyle("name")); item.length += text.length(); text = " " + time +"\n"; doc.insertString(doc.getLength(),text , doc.getStyle("time")); item.length += text.length(); text = " " + content + "\n\n" ; doc.insertString(doc.getLength(), text, doc.getStyle("content")); item.length += text.length(); itemList.add(item); } catch (BadLocationException e) { e.printStackTrace(); } // 当消息太多时，删除前面的消息 if(itemList.size() > 40) { Item item = itemList.get(0); itemList.remove(0); try { doc.remove(0, item.length); } catch (BadLocationException e) { e.printStackTrace(); } } } // 记录每一段消息的位置，方便清理删除 private static class Item { int length; } }