使用java比较器排序xml [英] sorting xml using java comparator

问题描述

<students>
	<student>
		<data>
			<key>stu-id</key>
			<value>56170</value>
		</data>
		<data>
			<key>dept</key>
			<value><?xml version="1.0" encoding="UTF-8"?>Description>Computer Science Department </dept-data></value>
		</data>
	</student>
	<student>
		<data>
			<key>stu-id</key>
			<value>56171</value>
		</data>
		<data>
			<key>dept</key>
			<value><?xml version="1.0" encoding="UTF-8"?>Description>Business Department </dept-data></value>
		</data>
	</student>
	<student>
		<data>
			<key>stu-id</key>
			<value>50278</value>
		</data>
		<data>
			<key>dept</key>
			<value><?xml version="1.0" encoding="UTF-8"?>Description>Economics Department </dept-data></value>
		</data>
	</student>
	<student>
		<data>
			<key>stu-id</key>
			<value>60241</value>
		</data>
		<data>
			<key>dept</key>
			<value><?xml version="1.0" encoding="UTF-8"?>Description>English Department </dept-data></value>
		</data>
	</student>
	<student>
		<data>
			<key>stu-id</key>
			<value>58123</value>
		</data>
		<data>
			<key>dept</key>
			<value><?xml version="1.0" encoding="UTF-8"?>Description> Physics Department </dept-data></value>
		</data>
	</student>
	<student>
		<data>
			<key>stu-id</key>
			<value>56126</value>
		</data>
		<data>
			<key>dept</key>
			<value><?xml version="1.0" encoding="UTF-8"?>Description>Chemistry Department </dept-data></value>
		</data>
	</student>
</students>

需要用java对上面的文件进行排序所以我写了一个比较器类

need to sort the above file with java so I wrote a comparator class

public class Comp implements Comparator<StudentType> {




        public class Comp implements Comparator<StudentType> {




        public int compare(StudentType o1,StudentType o2)
            return (o1.getStudentList().get(1).getValue().compareTo(o2.getStudentList().get(1).getValue()));


        }

}

打电话为

Calling as

List<StudentType> students = response.getStudents().getStudentList();


          Collections.sort(students, comparator);

新的排序档案看起来像这样

New sorted file looks like this

<students>
<student>
		<data>
			<key>stu-id</key>
			<value>56171</value>
		</data>
		<data>
			<key>dept</key>
			<value><?xml version="1.0" encoding="UTF-8"?>Description>Business Department </dept-data></value>
		</data>
	</student>
	<student>
		<data>
			<key>stu-id</key>
			<value>56170</value>
		</data>
		<data>
			<key>dept</key>
			<value><?xml version="1.0" encoding="UTF-8"?>Description>Computer Science Department </dept-data></value>
		</data>
	</student>
	<student>
		<data>
			<key>stu-id</key>
			<value>56170</value>
		</data>
		<data>
			<key>dept</key>
			<value><?xml version="1.0" encoding="UTF-8"?>Description>Computer Science Department </dept-data></value>
		</data>
	</student>
	<student>
		<data>
			<key>stu-id</key>
			<value>50278</value>
		</data>
		<data>
			<key>dept</key>
			<value><?xml version="1.0" encoding="UTF-8"?>Description>Economics Department </dept-data></value>
		</data>
	</student>
	<student>
		<data>
			<key>stu-id</key>
			<value>50278</value>
		</data>
		<data>
			<key>dept</key>
			<value><?xml version="1.0" encoding="UTF-8"?>Description>Economics Department </dept-data></value>
		</data>
	</student>
	<student>
		<data>
			<key>stu-id</key>
			<value>58123</value>
		</data>
		<data>
			<key>dept</key>
			<value><?xml version="1.0" encoding="UTF-8"?>Description> Physics Department </dept-data></value>
		</data>
	</student>
</students>

我不知道为什么竞选班级正在排序和删除一些数据并重复它



谢谢

I don''t know why the camparator class is sorting and deleting some data and duplicating it

Thanks

推荐答案

http://docs.oracle.com/javase/tutorial/collections/interfaces/order.html [ ^ ]



如何存储XML中的值？

某些集合倾向于覆盖已经存在的值。

http://docs.oracle.com/javase/tutorial/collections/interfaces/order.html[^]

How do you store the values from the XML?
some Collections have a tendency to overwrite values that are already in.

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