使用Betwixt将javaBean生成xml [转]
http://blog.csdn.net/pengchua/article/details/1955405
http://blog.csdn.net/pengchua/article/details/2410491
The Betwixt library provides an XML introspection mechanism for mapping beans to XML in a flexible way. It is implemented using an XMLIntrospector and XMLBeanInfo classes which are similar to the standard Introspector and BeanInfo from the Java Beans specification. （提供XML与JAVABEAN间的相互映射。）
http://commons.apache.org/betwixt/apidocs/index.html
将javaBean生成Xml的步骤：
1. 要产生的 目标xml:
<?xml version='1.0' ?>
<note>
<to>fdfdf</to>
<from name="frof"></from>
<heading name="tesdd"></heading>
<body name="fdfddf"></body>
</note>
2．而原始javaBean的信息为：
package betwixt;
publicclass NoteBean {
private String toWho;
private String fromWho;
private String title;
private String note;
public NoteBean() {
}
public String getFromWho() {
returnfromWho;
}
publicvoid setFromWho(String fromWho) {
this.fromWho = fromWho;
}
public String getNote() {
returnnote;
}
publicvoid setNote(String note) {
this.note = note;
}
public String getTitle() {
returntitle;
}
publicvoid setTitle(String title) {
this.title = title;
}
public String getToWho() {
returntoWho;
}
publicvoid setToWho(String toWho) {
this.toWho = toWho;
}
}
2. 撰写 .betwixt，文件名需和 bean 相同，故为 NoteBean.betwixt
<info primitiveTypes="element">
<element name="note">
<element name="to" property="toWho" />
<element name="from">
<attribute name="name" property="fromWho"/>
</element>
<element name="heading">
<attribute name="name" property="title"/>
</element>
<element name="body">
<attribute name="name" property="note"/>
</element>
<!-- <addDefaults />-->
</element>
</info>
注意： a. <element name="to" property="toWho" />
表示name要显示的xml中的元素名, property表示对应javaBean中一个属性名，其值显示在<></>里面。
b. <element name="from">
<attribute name="name" property="fromWho"/>
</element>
中间加：<attribute name="name" property="fromWho"/>
表示会在在结点上加一个属性为name，其值显示在里面。
c. <addDefaults />加上默认的结点，是以javaBean中的属性来显示。
3.写测试代码：
import java.io.StringWriter;
import org.apache.commons.betwixt.io.BeanWriter;
publicclass WriteExampleApp {
/**
*Createanexamplebeanandthenconvertittoxml.
*/
publicstaticfinalvoid main(String [] args) throws Exception {
// Start by preparing the writer
// We'll write to a string
StringWriter outputWriter = new StringWriter();
// Betwixt just writes out the bean as a fragment
// So if we want well-formed xml, we need to add the prolog
outputWriter.write("<?xml version='1.0' ?>");
// Create a BeanWriter which writes to our prepared stream
BeanWriter beanWriter = new BeanWriter(outputWriter);
// Configure betwixt
// For more details see java docs or later in the main documentation
beanWriter.getXMLIntrospector().getConfiguration().setAttributesForPrimitives(false);
beanWriter.getBindingConfiguration().setMapIDs(false);
beanWriter.enablePrettyPrint(); //启用缩进格式.
beanWriter.setEndTagForEmptyElement(true);
// beanWriter.setIndent("/t");
beanWriter.writeXmlDeclaration("");
NoteBean test=new NoteBean();
test.setToWho("fdfdf");
test.setFromWho("frof");
test.setTitle("tesdd");
test.setNote("fdfddf");
// If the base element is not passed in, Betwixt will guess
// But let's write example bean as base element 'person'
beanWriter.write("note", test);
// Write to System.out
// (We could have used the empty constructor for BeanWriter
// but this way is more instructive)
System.out.println(outputWriter.toString());
// Betwixt writes fragments not documents so does not automatically close
// writers or streams.
// This example will do no more writing so close the writer now.
outputWriter.close();
}
}
