我使用以下代码堆空间错误。
任何人都知道如何优化此代码。
对于大文件[180MB]会发生这种情况。方法参数具有与每个区域设置对应的大约50个metatag 键值。处理4500页后会出现错误。
注意:我尝试将 foreach 更改为 iterator 以使用 iterator.remove()< / em>用于释放空间。
public static String myChildPropsToString(final UnicodeProperties myLayoutProps) {
final StringBuilder sb = new StringBuilder(myLayoutProps.size());
final String[] matchTarget = new String[] { StringPool.RETURN_NEW_LINE, StringPool.NEW_LINE, StringPool.RETURN };
final String[] replaceTargetBy = new String[] { "_SAFE_NEWLINE_CHARACTER_", "_SAFE_NEWLINE_CHARACTER_",
"_SAFE_NEWLINE_CHARACTER_" };
//COMMENTED TO TRY OUT ITERATOR.REMOVE
//
// for (final Map.Entry<String, String> entry : myLayoutProps.entrySet()) {
// final String value = entry.getValue();
//
// if (Validator.isNotNull(value)) {
// StringUtil.replace(value, matchTarget, replaceTargetBy);
//
// sb.append(entry.getKey());
// sb.append(StringPool.EQUAL);
// sb.append(value);
// sb.append(StringPool.NEW_LINE);
// }
// }
final Iterator<Entry<String, String>> propsIterator = myLayoutProps.entrySet().iterator();
while (propsIterator.hasNext()) {
final Entry<String, String> entry = propsIterator.next();
if (Validator.isNotNull(entry.getValue())) {
StringUtil.replace(entry.getValue(), matchTarget, replaceTargetBy);
sb.append(entry.getKey());
sb.append(StringPool.EQUAL);
sb.append(entry.getValue());
sb.append(StringPool.NEW_LINE);
}
}
propsIterator.remove();
return sb.toString();
}
从我的代码我将其设置为父属性obj,如下所示:
UnicodeProperties myParentProps = new UnicodeProperties();
//Set some values to parent
UnicodeProperties myLayoutProps = new UnicodeProperties();
//Set some values to child
....
myParentProps.setProperty("childProp",myChildPropsToString(myLayoutProps));
任何帮助都将深表感谢!
答案 0 :(得分:0)
尝试放置propsIterator.remove();在里面。
final Iterator<Entry<String, String>> propsIterator = myLayoutProps.entrySet().iterator();
while (propsIterator.hasNext()) {
final Entry<String, String> entry = propsIterator.next();
if (Validator.isNotNull(entry.getValue())) {
StringUtil.replace(entry.getValue(), matchTarget, replaceTargetBy);
sb.append(entry.getKey());
sb.append(StringPool.EQUAL);
sb.append(entry.getValue());
sb.append(StringPool.NEW_LINE);
}
propsIterator.remove();
}