XStream把xml文件转化为java对象

 

步骤：

1、一份格式良好的xml文件，xml文件是节点格式。

2、新建java对象，包含属性，属性名可以与xml文件的标签名称相同，也可以不相同，最好是相同，这样的话在转换时就不必把标签和属性再做一次对应了。

3、测试输出结果。

步骤1：用dom4j生成xml文件

package com.techcenter.xml;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;

import org.dom4j.io.XMLWriter;

public class Dom4jDemo {
public static void main(String[] args) {
String pathname = "d://books.xml";
int i = createXMLFile(pathname);
System.out.println(i);
}
/**
* @param pathname
* @return
*/
public static int createXMLFile(String pathname){
int returnValue = 0;
try {
Document document = DocumentHelper.createDocument();
document.addComment("一个简单的xml文档的事例");
//document.addProcessingInstruction("target", "instruction");
Element root = document.addElement("books");
for(int i=0;i<5;i++){
Element bookElement = root.addElement("book");
Element nameElement = bookElement.addElement("name");
nameElement.addText("计算机技术概论"+i);
Element authorElement = bookElement.addElement("author");
authorElement.addText("王敏"+i);
Element element = bookElement.addElement("date");
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String date = dateFormat.format(new Date());
element.addText(date);
}
//美化输出格式
OutputFormat format = OutputFormat.createPrettyPrint();
format.setEncoding("GBK");
XMLWriter writer = new XMLWriter(new FileWriter(new File(pathname)),format);
writer.write(document);
writer.close();
returnValue = 1;
} catch (IOException e) {
e.printStackTrace();
}
return returnValue;
}
}

xml文件内容：

<?xml version="1.0" encoding="GBK"?>

<!--一个简单的xml文档的事例-->
<books>
<book>
<name>计算机技术概论0</name>
<author>王敏0</author>
<date>2010-11-23 09:37:46</date>
</book>
<book>
<name>计算机技术概论1</name>
<author>王敏1</author>
<date>2010-11-23 09:37:46</date>
</book>
<book>
<name>计算机技术概论2</name>
<author>王敏2</author>
<date>2010-11-23 09:37:46</date>
</book>
<book>
<name>计算机技术概论3</name>
<author>王敏3</author>
<date>2010-11-23 09:37:46</date>
</book>
<book>
<name>计算机技术概论4</name>
<author>王敏4</author>
<date>2010-11-23 09:37:46</date>
</book>
</books>
步骤2：新建Book对象

package com.techcenter.xml;

public class Book {

private String name;
private String author;
private String date ;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}

}

新建Books对象：

package com.techcenter.xml;

import java.util.ArrayList;

public class Books {

//根节点books对应Books类，book节点对应Book类，有多个book节点，这里需转换到集合中
private ArrayList<Book> books;

public ArrayList<Book> getBooks() {
return books;
}

public void setBooks(ArrayList<Book> books) {
this.books = books;
}

}

步骤3：输出测试结果：

/**
*
*/
package com.techcenter.xml;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.ArrayList;
import com.thoughtworks.xstream.XStream;

public class XStreamDemo {
public static void main(String[] args) {
xmlToJavaBean();
}

/**
* 把xml转化为java对象
*/
public static void xmlToJavaBean(){
XStream stream = new XStream();
String xml = "d://books.xml";
try {
stream.alias("book",Book.class);
stream.alias("books",Books.class);
//设置隐含转化集合

//根节点books对应Books类，book节点对应Book类，有多个book节点，这里需转换到集合中
stream.addImplicitCollection(Books.class, "books");
Books books = (Books) stream.fromXML(new FileReader(new File(xml)));
ArrayList<Book> bookList = books.getBooks();
for(int i=0;i<bookList.size();i++){
Book book = (Book) bookList.get(i);
System.out.println("name："+book.getName()+"，"+"author:"+book.getAuthor()+"，"+"date:"+book.getDate());
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}

}

}