XStream 初探,很给力

朱雀 2022-09-21 04:53 206阅读 0赞

Xtream 在对象和xml 互相转换上是非常方便且效率很高，所以把我的使用的心得给大家分享一下。

主要代码

/**
         * Xstream 测试
         * @return
         */
        @RequestMapping("/forward/xstream")
        public String xstream(){
        	String str = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><epay><items><item><id>2</id><name>cyc1</name></item><item><id>1</id><name>cyc</name></item></items></epay>";
        	XStream xstream = new XStream();
        	//获取生成的对象
        	TestVo testVo = getPerson();
        	//构建对应的节点(这里很重要构建生成的Xml 文件或者对象的节点)
        	xstream.alias("epay",TestVo.class);
        	xstream.aliasField("items",TestVo.class, "list");
        	xstream.alias("item", tests.class);
        	//将对象转为xml
        	String xml = xstream.toXML(testVo);
        	System.out.println("cyc==== XStream:"+xml);
        	//将xml转为对象
        	TestVo testVos = (TestVo) xstream.fromXML(str);
        	System.out.println("cyc==== testVos"+testVos);
        	//将对象再次转为xml
        	String xml2 = xstream.toXML(testVos);
        	System.out.println("cyc==== XStream2:"+xml2);
        	System.out.println("cyc==== Size:"+testVos.getList().size());
        	return "publicTpl/notChrome";
        }
        public TestVo getPerson(){
        	TestVo testVo = new TestVo();
        	List<tests> list = new ArrayList<tests>();
        	for(int i=0;i<10;i++){
        		tests tests = new tests();
            	tests.setId("1");
            	tests.setName("cyc");
            	list.add(tests);
        	}
        	testVo.setList(list);
        	return testVo;
        }

TestVo类代码:

public class TestVo {
    	private List<tests> list;
    
    	public List<tests> getList() {
    		return list;
    	}
    
    	public void setList(List<tests> list) {
    		this.list = list;
    	}
    
    	@Override
    	public String toString() {
    		return "TestVo [list=" + list + "]";
    	}
    	
    }

tests类代码:

public class tests {
    	private String id;
    	private String name;
    	public String getId() {
    		return id;
    	}
    	public void setId(String id) {
    		this.id = id;
    	}
    	public String getName() {
    		return name;
    	}
    	public void setName(String name) {
    		this.name = name;
    	}
    	@Override
    	public String toString() {
    		return "tests [id=" + id + ", name=" + name + "]";
    	}
    	
    }

输出结果：

cyc==== XStream:<epay>
      <items>
        <item>
          <id>1</id>
          <name>cyc</name>
        </item>
        <item>
          <id>1</id>
          <name>cyc</name>
        </item>
        <item>
          <id>1</id>
          <name>cyc</name>
        </item>
        <item>
          <id>1</id>
          <name>cyc</name>
        </item>
        <item>
          <id>1</id>
          <name>cyc</name>
        </item>
        <item>
          <id>1</id>
          <name>cyc</name>
        </item>
        <item>
          <id>1</id>
          <name>cyc</name>
        </item>
        <item>
          <id>1</id>
          <name>cyc</name>
        </item>
        <item>
          <id>1</id>
          <name>cyc</name>
        </item>
        <item>
          <id>1</id>
          <name>cyc</name>
        </item>
      </items>
    </epay>
    cyc==== testVosTestVo [list=[tests [id=2, name=cyc1], tests [id=1, name=cyc]]]
    cyc==== XStream2:<epay>
      <items>
        <item>
          <id>2</id>
          <name>cyc1</name>
        </item>
        <item>
          <id>1</id>
          <name>cyc</name>
        </item>
      </items>
    </epay>
    cyc==== Size:2

（maven）所续的pom文件:

<dependency>
    		    <groupId>xstream</groupId>
    		    <artifactId>xstream</artifactId>
    		    <version>1.2.2</version>
    		</dependency>

注意事项:如果想在java 项目中运行这个需要添加一些关联的包不然的话会报一个：

Exception in thread "main" com.thoughtworks.xstream.io.StreamException: Cannot create XmlPullParser
    	at com.thoughtworks.xstream.io.xml.AbstractXppDriver.createReader(AbstractXppDriver.java:56)
    	at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1085)
    	at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1076)
    	at test.test3.main(test3.java:16)
    Caused by: org.xmlpull.v1.XmlPullParserException: could not load any factory class (even small or full default implementation); nested exception is: 
    	org.kxml2.io.XmlReader
    	at org.xmlpull.v1.XmlPullParserFactory.newInstance(XmlPullParserFactory.java:225)
    	at org.xmlpull.v1.XmlPullParserFactory.newInstance(XmlPullParserFactory.java:76)
    	at com.thoughtworks.xstream.io.xml.XppDriver.createParser(XppDriver.java:57)
    	at com.thoughtworks.xstream.io.xml.AbstractXppDriver.createReader(AbstractXppDriver.java:54)
    	... 3 more