Java中利用simpleFramework解析xml

最新推荐文章于 2021-03-20 05:47:59 发布

taoyuanforrest

最新推荐文章于 2021-03-20 05:47:59 发布

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分类专栏： Java 文章标签： java string reference import xml list

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本文介绍如何使用SimpleXML库解析复杂的XML数据。通过构建特定的Java类来映射XML结构，并提供示例代码演示如何从XML文件中提取学生记录信息。

声明：本文为原创，欢迎转载，转载请注明出处。

simple的主页在http://simple.sourceforge.net/home.php

利用它可以方便的解析xml. 主要思路是先根据要解析的XML构建一个类，然后通过这个类去取xml里面具体的值域。

以下是一个简单的例子，学生记录里有年级，学号，姓名，性别等信息，现在通过simple xml把信息解出来。

<?xml version="1.0" encoding="UTF-8"?>
<StudentRecords>
  <list name="grade1">
	<entry id="1">
		<name>John</name>
		<gender>Boy</gender>
	</entry>
	<entry id="2">
		<name>Joe</name>
		<gender>Girl</gender>
	</entry>
  </list>
  <list name="grade2">
	<entry id="1">
		<name>Bill</name>
		<gender>Boy</gender>
	</entry>
  </list>
</StudentRecords>

首先在工程属性中把simple的jar加到Java Build Path的Libraries里面。这里用的是simple-xml-2.3.4.jar

构建的类具体如下，SunStudent是总类，里面有每个年级列表的集合；SunList是每个年级学生的列表，包含了一个学生集合；SunEntry是每个学生的信息类。

import java.util.ArrayList;
import java.util.List;

import org.simpleframework.xml.ElementList;
import org.simpleframework.xml.Namespace;
import org.simpleframework.xml.Root;


@Root(name = "StudentRecords", strict=false)
@Namespace(reference = "urn:sun:params:xml:ns:students")
public class SunStudent {

	@ElementList(inline=true, required=false)
	protected List<SunList> list;
	    
	public List<SunList> getList() {
	    if (list == null) {
	        list = new ArrayList<SunList>();
	    }
	    return this.list;
    }
}

import java.util.ArrayList;

import org.simpleframework.xml.Attribute;
import org.simpleframework.xml.ElementList;
import org.simpleframework.xml.Namespace;
import org.simpleframework.xml.Root;


@Root(name = "list", strict=false)
@Namespace(reference = "urn:sun:params:xml:ns:students")
public class SunList {

    @ElementList(inline=true, required=false)
    protected java.util.List<SunEntry> entries;
    @Attribute(required=true)
    protected String name;
   
   
    public String getName() {
        return name;
    }
   
    public void setName(String value) {
        this.name = value;
    }
   
    public java.util.List<SunEntry> getEntries(){
    	if(this.entries == null){
    		this.entries = new ArrayList<SunEntry>();
    	}
    	return this.entries;
    }

}

import org.simpleframework.xml.Attribute;
import org.simpleframework.xml.Element;
import org.simpleframework.xml.Namespace;
import org.simpleframework.xml.Root;

@Root(name="entry", strict=false)
@Namespace(reference = "urn:sun:params:xml:ns:students")
public class SunEntry {

    @Element(name = "name", required = true)
    protected String studentName;
    @Element(name = "gender", required = true)
    protected String studentGender;
    @Attribute(required = true)
    protected String id;

    public String getStudentID() {
        return id;
    }
    
    public void setstudentID(String value) {
        this.id = value;
    }
    
    public String getStudentName() {
        return studentName;
    }
    
    public void setstudentName(String value) {
        this.studentName = value;
    }

    public String getStudentGender() {
        return studentGender;
    }
    
    public void setstudentGender(String value) {
        this.studentGender = value;
    }
    
}

测试代码如下：

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader; 
import java.util.List;

import org.simpleframework.xml.Serializer;
import org.simpleframework.xml.core.Persister;

public class SunTest {  

	public static void main(String[] args) throws IOException { 
		String result = "";
		BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream("D:\\sun.xml")));
		String tmpStr = "";
		final Serializer serializer;
		serializer = new Persister();
		
		while ((tmpStr = br.readLine())!=null){
			result = result + tmpStr.trim();
		}
		System.out.print("the xml file is: " + result + "\n");
		try {
			SunStudent studentRecords = serializer.read(SunStudent.class, new String(result));
			List<SunList> gradeList = studentRecords.getList();
			for (int gradeNo = 0; gradeNo < gradeList.size(); gradeNo++){
				SunList eachList = (SunList)(gradeList.get(gradeNo));
				List<SunEntry> entries = eachList.getEntries();
				System.out.print("\n" + "student Grade: " + eachList.getName() + "\n");
				for (int studentID = 0; studentID < entries.size(); studentID ++){
					SunEntry eachEntry = (SunEntry)(entries.get(studentID));
					System.out.print("student ID: " + eachEntry.getStudentID() + "\n");
					System.out.print("student Name: " + eachEntry.getStudentName() + "\n");
					System.out.print("student Gender: " + eachEntry.getStudentGender() + "\n");
				}
			}
		}
		catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

打印结果如下：

the xml file is: <?xml version="1.0" encoding="UTF-8"?><StudentRecords><list name="grade1"><entry id="1"><name>John</name><gender>Boy</gender></entry><entry id="2"><name>Joe</name><gender>Girl</gender></entry></list><list name="grade2"><entry id="1"><name>Bill</name><gender>Boy</gender></entry></list></StudentRecords>

student Grade: grade1
student ID: 1
student Name: John
student Gender: Boy
student ID: 2
student Name: Joe
student Gender: Girl

student Grade: grade2
student ID: 1
student Name: Bill
student Gender: Boy