java - 如何从字符串中删除所有出现的子字符串
问题描述
我有一个字符串(txt),在这个字符串中是 html 代码。我将使用 txt.indexOf 搜索字符串 ("< ac:structured-macro ac:macro-id=")
并使用 StringBuffer(sb) sb.delete(Index, EndIndex) 将其删除。我将多次执行此操作,但是当我使用 while Loop 执行此操作时,它不起作用并且仅找到第一个元素的索引(“ac:structured-macro ac:macro-id=")。
编辑:主要问题是 id 总是不同的,我也想删除它。
String txt = textArea1.getText();
/*somthing like this <p>
<p>
<br/>
</p>
<ac:structured-macro ac:macro-id="74563a55-dc09-41a1-acaa-7c6338ab4014" ac:name="unmigrated-wiki-markup"
ac:schema-version="1">
<ac:plain-text-body>
<![CDATA[
Lorem ipsum dolor sit amet, consetetur sadipscing elitr
]]>
</ac:plain-text-body>
</ac:structured-macro>
<p>
<br/>
</p>
<ac:structured-macro ac:macro-id="bc7e6c08-82c8-4ee9-8582-b773914857f" ac:name="unmigrated-wiki-markup"
ac:schema-version="1">
<ac:plain-text-body>
<![CDATA[
Lorem ipsum dolor sit amet, consetetur sadipscing elitr
]]>
</ac:plain-text-body>
</ac:structured-macro>
*/
int StartIndexOfMacroID = 0;
int indexEndOfMacroID = 0;
StringBuffer sb = new StringBuffer(txt);
while (StartIndexOfMacroID != -1) {
StartIndexOfMacroID = txt.indexOf("<ac:structured-macro ac:macro-id=");
indexEndOfMacroID = StartIndexOfMacroID + 159;
sb.delete(StartIndexOfMacroID, indexEndOfMacroID);
System.out.println(StartIndexOfMacroID);
);
txt = sb.toString();
System.out.println(StartIndexOfMacroID);
System.out.println(indexEndOfMacroID);
textArea2.setText(txt);
这是输出:
17
176
159
318
Exception in thread "AWT-EventQueue-0" java.lang.StringIndexOutOfBoundsException: start -1, end 158, length 282
at java.base/java.lang.AbstractStringBuilder.checkRangeSIOOBE(AbstractStringBuilder.java:1724)
at java.base/java.lang.AbstractStringBuilder.delete(AbstractStringBuilder.java:863)
at java.base/java.lang.StringBuffer.delete(StringBuffer.java:474)
at com.company.Main$1.actionPerformed(Main.java:115)
at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967)
at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2308)
at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405)
at java.desktop/javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262)
at java.desktop/javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:270)
at java.desktop/java.awt.Component.processMouseEvent(Component.java:6651)
at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3342)
at java.desktop/java.awt.Component.processEvent(Component.java:6416)
at java.desktop/java.awt.Container.processEvent(Container.java:2263)
at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5026)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4858)
at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4918)
at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4547)
at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4488)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2307)
at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2772)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4858)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:778)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:727)
at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:751)
at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:749)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:748)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
谢谢您的帮助!
解决方案
基本上,问题是删除原始字符串中某个 html 标记的所有出现。
在 java 中,它可能比您的方法所需的工作量少得多:
final String htmlContent = textArea1.getText();
final String filteredHtmlContent = htmlContent.replaceAll("<ac:structured-macro.*?</ac:structured-macro>", "");
此代码将所有出现的给定字符串替换为空字符串,这相当于删除它们。
不幸的是,您发布的代码没有编译。因此,分析它不能正常工作的原因是没有意义的。我强烈建议在将其发送到 stackoverflow 社区之前对其进行审查。
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