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在java中合并XML，使多个节点的标记名与子节点相同？

3 月，2 周 Questions & Answers 99

我在合并两个XML字符串或文件时遇到问题

XML1

<?xml version="1.0" encoding="UTF-8"?>
<Specification>
	<item>
		<id>PS1</id>
		<startDate> 21 Oct 2016</startDate>
		<Product>
			<item>
				<id>P1</id>
				<startDate> 21 Oct 2016</startDate>
			</item>
			<item>
				<id>P2</id>
				<startDate> 21 Oct 2016</startDate>
			</item>
		</Product>
		<CompositePrice>
			<item>
				<id>PR1</id>
				<startDate> 21 Oct 2016</startDate>
				<Price>1.0</Price>
			</item>
			<item>
				<id>PR2</id>
				<startDate> 21 Oct 2016</startDate>
				<Price>2.0</Price>
			</item>
		</Price>
	</item>
	<item>
		<id>PS2</id>
		<startDate> 21 Oct 2016</startDate>
		<Product>
			<item>
				<id>P3</id>
				<startDate> 21 Oct 2016</startDate>
			</item>
			<item>
				<id>P4</id>
				<startDate> 21 Oct 2016</startDate>
			</item>
		</Product>
		<CompositePrice>
			<item>
				<id>PR3</id>
				<startDate> 21 Oct 2016</startDate>
				<Price>1.0</Price>
			</item>
			<item>
				<id>PR4</id>
				<startDate> 21 Oct 2016</startDate>
				<Price>2.0</Price>
			</item>
		</Price>
	</item>
</Specification>

XML2

<?xml version="1.0" encoding="UTF-8"?>
<Specification>
	<item>
		<id>PS3</id>
		<startDate> 21 Oct 2016</startDate>
		<Product>
			<item>
				<id>P5</id>
				<startDate> 21 Oct 2016</startDate>
			</item>
			<item>
				<id>P6</id>
				<startDate> 21 Oct 2016</startDate>
			</item>
		</Product>
		<CompositePrice>
			<item>
				<id>PR5</id>
				<startDate> 21 Oct 2016</startDate>
				<Price>1.0</Price>
			</item>
			<item>
				<id>PR6</id>
				<startDate> 21 Oct 2016</startDate>
				<Price>2.0</Price>
			</item>
		</Price>
	</item>
	<item>
		<id>PS1</id>
		<startDate> 21 Oct 2016</startDate>
		<Product>
			<item>
				<id>P7</id>
				<startDate> 21 Oct 2016</startDate>
			</item>
			<item>
				<id>P8</id>
				<startDate> 21 Oct 2016</startDate>
			</item>
		</Product>
		<CompositePrice>
			<item>
				<id>PR3</id>
				<startDate> 21 Oct 2016</startDate>
				<Price>1.0</Price>
			</item>
			<item>
				<id>PR4</id>
				<startDate> 21 Oct 2016</startDate>
				<Price>2.0</Price>
			</item>
		</Price>
	</item>
</Specification>

预期产出：

<?xml version="1.0" encoding="UTF-8"?>
<Specification>
	<item>
		<id>PS1</id>
		<startDate> 21 Oct 2016</startDate>
		<Product>
			<item>
				<id>P1</id>
				<startDate> 21 Oct 2016</startDate>
			</item>
			<item>
				<id>P2</id>
				<startDate> 21 Oct 2016</startDate>
			</item>
		</Product>
		<CompositePrice>
			<item>
				<id>PR1</id>
				<startDate> 21 Oct 2016</startDate>
				<Price>1.0</Price>
			</item>
			<item>
				<id>PR2</id>
				<startDate> 21 Oct 2016</startDate>
				<Price>2.0</Price>
			</item>
		</Price>
	</item>
	<item>
		<id>PS2</id>
		<startDate> 21 Oct 2016</startDate>
		<Product>
			<item>
				<id>P3</id>
				<startDate> 21 Oct 2016</startDate>
			</item>
			<item>
				<id>P4</id>
				<startDate> 21 Oct 2016</startDate>
			</item>
		</Product>
		<CompositePrice>
			<item>
				<id>PR3</id>
				<startDate> 21 Oct 2016</startDate>
				<Price>1.0</Price>
			</item>
			<item>
				<id>PR4</id>
				<startDate> 21 Oct 2016</startDate>
				<Price>2.0</Price>
			</item>
		</Price>
	</item>
	<item>
		<id>PS3</id>
		<startDate> 21 Oct 2016</startDate>
		<Product>
			<item>
				<id>P5</id>
				<startDate> 21 Oct 2016</startDate>
			</item>
			<item>
				<id>P6</id>
				<startDate> 21 Oct 2016</startDate>
			</item>
		</Product>
		<CompositePrice>
			<item>
				<id>PR5</id>
				<startDate> 21 Oct 2016</startDate>
				<Price>1.0</Price>
			</item>
			<item>
				<id>PR6</id>
				<startDate> 21 Oct 2016</startDate>
				<Price>2.0</Price>
			</item>
		</Price>
	</item>
	<item>
		<id>PS1</id>
		<startDate> 21 Oct 2016</startDate>
		<Product>
			<item>
				<id>P7</id>
				<startDate> 21 Oct 2016</startDate>
			</item>
			<item>
				<id>P8</id>
				<startDate> 21 Oct 2016</startDate>
			</item>
		</Product>
		<CompositePrice>
			<item>
				<id>PR3</id>
				<startDate> 21 Oct 2016</startDate>
				<Price>1.0</Price>
			</item>
			<item>
				<id>PR4</id>
				<startDate> 21 Oct 2016</startDate>
				<Price>2.0</Price>
			</item>
		</Price>
	</item>
</Specification>

我试图运行一个java代码，但当第二个代码有多个项目在规范下时，合并失败。当第二个项目只有一个项目时运行正常，即使第一个项目有多个符合规范的项目

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