xml和实体对象相互转换 一步到位 博客分类： J2EEXML javaxmlxstream转换
程序员文章站
2024-03-24 21:12:46
...
用Xstream完成xml与对象之间的相互转换，我在xstream包的基础上简单的封装了一下：
如以下xml：
<?xml version="1.0" encoding="UTF-8"?>
<html>
<body>
<div id="div1" name="div"/>
<form action="saveForm.asp" method="post">
<h1>请输入您的联系信息：</h1>
<lable>名字:</lable>
<p>
<input type="submit" id="btn_sub" name="btn_sub" value="Submit"/>
<input type="reset" id="btn_res" name="btn_res" value="Reset"/>
</p>
</form>
</body>
</html>
想快速转换成对象。
第一步将xml分解成不同的对象如下，HtmlBean 为主体对象：
<html>标签：
@XStreamAlias("html")
public class HtmlBean implements BaseConverterBean {
private HtmlBody body;
public HtmlBody getBody() {
return body;
}
public void setBody(HtmlBody body) {
this.body = body;
}
}
<body>标签：
@XStreamAlias("body")
public class HtmlBody implements BaseConverterBean {
private HtmlDiv div;
private HtmlForm form;
public HtmlForm getForm() {
return form;
}
public void setForm(HtmlForm form) {
this.form = form;
}
public HtmlDiv getDiv() {
return div;
}
public void setDiv(HtmlDiv div) {
this.div = div;
}
}
<div>标签：
@XStreamAlias("div")
public class HtmlDiv implements BaseConverterBean {
@XStreamAsAttribute
private String id;
@XStreamAsAttribute
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;
}
}
<form>标签：
@XStreamAlias("form")
public class HtmlForm implements BaseConverterBean {
@XStreamAsAttribute
private String action;
@XStreamAsAttribute
private String method;
private String h1;
private String lable;
private HtmlP p;
public String getAction() {
return action;
}
public void setAction(String action) {
this.action = action;
}
public String getMethod() {
return method;
}
public void setMethod(String method) {
this.method = method;
}
public String getH1() {
return h1;
}
public void setH1(String h1) {
this.h1 = h1;
}
public String getLable() {
return lable;
}
public void setLable(String lable) {
this.lable = lable;
}
public HtmlP getP() {
return p;
}
public void setP(HtmlP p) {
this.p = p;
}
}
<p>标签：
@XStreamAlias("p")
public class HtmlP implements BaseConverterBean {
@XStreamImplicit
private List<HtmlInput> input;
public List<HtmlInput> getInput() {
return input;
}
public void setInput(List<HtmlInput> input) {
this.input = input;
}
}
<input>标签：
@XStreamAlias("input")
public class HtmlInput implements BaseConverterBean {
@XStreamAsAttribute
private String type;
@XStreamAsAttribute
private String id;
@XStreamAsAttribute
private String name;
@XStreamAsAttribute
private String value;
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
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;
}
public String getValue() {
return value;
}
public void setValue(String value) {
this.value = value;
}
}
第二步：利用xstream将xml文件转换为对象HtmlBean ：
public class XMLToBeanConverterTest {
@Before
public void setUp() throws Exception {
}
@After
public void tearDown() throws Exception {
}
@Test
public void testToBean() {
HtmlBean bean = null;
XStream xstream = XstreamUtil.getDriverInstace();
String xml = getResourceFileContent(XMLToBeanConverterTest.class, "html.xml");
if(xml!=null && !"".equals(xml)){
bean = (HtmlBean)ConverterFactory.getXMLToBeanConverterInstance(xml).stringToBean(xstream, HtmlBean.class, true);
}
String divid = bean.getBody().getDiv().getId();
String expected = "div1";
assertEquals(expected, divid);
}
@SuppressWarnings("unchecked")
public static String getResourceFileContent(Class c,String name){
StringBuffer sb = new StringBuffer();
try {
InputStream input = c.getClassLoader().getResourceAsStream(name);
BufferedReader reader = new BufferedReader(new InputStreamReader(input,"UTF-8"));
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line);
}
reader.close();
input.close();
} catch (Exception e) {
e.printStackTrace();
}
return sb.toString();
}
}
ConverterFactory：
/**
* 转换器工厂
*
* @author crawler
*
*/
public class ConverterFactory {
/**
* 获得BeanToXMLConverter实例化对象
*
* @param bean 实体Bean对象
*
* @return BeanToXMLConverter 实例化对象
*/
public static XMLConverter getBeanToXMLConverterInstance(BaseConverterBean bean) {
return new BeanToXMLConverter(bean);
}
public static BeanConverter getXMLToBeanConverterInstance(String xml) {
return new XMLToBeanConverter(xml);
}
}
XMLToBeanConverter：
/**
* xml转换为对应的实体bean对象
*
* @author crawler
*
*/
public class XMLToBeanConverter implements BeanConverter {
private String xml;
public XMLToBeanConverter(String xml){
this.xml = xml;
}
@SuppressWarnings("unchecked")
public BaseConverterBean stringToBean(XStream xstream,Class type,boolean isAttribute) {
if(isAttribute){
xstream.processAnnotations(type);
}
return (BaseConverterBean)xstream.fromXML(xml);
}
}
第三步：将bean对象转换成xml：
public class BeanToXMLConverterTest {
@Before
public void setUp() throws Exception {
}
@After
public void tearDown() throws Exception {
}
@Test
public void testToXml() {
HtmlBean bean = new HtmlBean();
HtmlBody body = new HtmlBody();
HtmlDiv div = new HtmlDiv();
HtmlForm form = new HtmlForm();
HtmlP p = new HtmlP();
List<HtmlInput> inputs = new ArrayList<HtmlInput>();
HtmlInput input = new HtmlInput();
input.setId("btn_sub");
input.setType("submit");
input.setName("btn_sub");
input.setValue("Submit");
HtmlInput input2 = new HtmlInput();
input2.setId("btn_res");
input2.setType("reset");
input2.setName("btn_res");
input2.setValue("Reset");
inputs.add(input);
inputs.add(input2);
p.setInput(inputs);
div.setId("div1");
div.setName("div");
form.setAction("saveForm.asp");
form.setH1("请输入您的联系信息：");
form.setLable("名字:");
form.setMethod("post");
form.setP(p);
body.setDiv(div);
body.setForm(form);
bean.setBody(body);
XMLConverter converter = ConverterFactory.getBeanToXMLConverterInstance(bean);
XStream xstream = XstreamUtil.getInstance();
// 将对象转换为xml文件
String xml = converter.toXml(xstream, bean.getClass(), true);
Document doc = null;
try {
doc = DocumentHelper.parseText(xml);
} catch (DocumentException e) {
e.printStackTrace();
}
if(doc!=null){
xml = doc.asXML();
}
System.out.println(xml);
}
}
BeanToXMLConverter：
/**
* 将bean对象转换为xml形式的转换器
*
* @author crawler
*
*/
public class BeanToXMLConverter implements XMLConverter {
private BaseConverterBean bean;
public BeanToXMLConverter(BaseConverterBean bean) {
this.bean = bean;
}
@SuppressWarnings("unchecked")
public String toXml(XStream xstream,Class type,boolean isAttribute) {
if(isAttribute){
xstream.processAnnotations(type);
}
return xstream.toXML(bean);
}
}
打印结果：
<?xml version="1.0" encoding="UTF-8"?>
<html>
<body>
<div id="div1" name="div"/>
<form action="saveForm.asp" method="post">
<h1>请输入您的联系信息：</h1>
<lable>名字:</lable>
<p>
<input type="submit" id="btn_sub" name="btn_sub" value="Submit"/>
<input type="reset" id="btn_res" name="btn_res" value="Reset"/>
</p>
</form>
</body>
</html>
与顶部的xml完全一致。这样就完成了相互的转换很方便。
如果需要可以下载附件我贴上了我的Myeclipse工程，有对应的测试类和源码。