java 关于xml的注解，自动生成xml文件 - @XML

 

       用的是jdk自带的javax.xml.bind.JAXBContext将对象和xml字符串进行相互转换。
       如果对要生成的 xml 格式有点些许的限制，就会对生成xml的对象就需要进行些许控制，控制对象的一个最可行的办法就是用注解。
       （jdk 1.6 api：http://www.cs.uic.edu/~mcpc/Java_Docs/api/index.html?javax/xml/bind/JAXBContext.html）

       比较常用的几个：
       @XmlRootElement：根节点
       @XmlAttribute：该属性作为xml的attribute
       @XmlElement：该属性作为xml的element，且可以增加属性(name="NewElementName")，那么生成的xml串的elment的标签是NewElementName

        示例：   
      

[java]
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package test; 
 
import java.io.StringWriter; 

 
import javax.xml.bind.JAXBContext; 

import javax.xml.bind.JAXBException; 

import javax.xml.bind.Marshaller; 

 
import test.bean.EleClassA; 

import test.bean.EleClassB; 

import test.bean.RootClass; 

 
public class Test1 { 

 
    public static
void main(String[] args) { 
        RootClass rc = new RootClass(); 

        EleClassA a = new EleClassA(); 

        EleClassB b = new EleClassB(); 

         
        a.setAttrC("attrc"); 

        a.setEleA("eleA"); 

        a.setEleB("eleB"); 
         
        b.setAttrPassword("attrPassword"); 

        b.setAttrUserName("attrUsrName"); 

        b.setEleCode("eleCode"); 

         
        rc.setA(a); 
        rc.setB(b); 
        rc.setRoot("root"); 
        rc.setRootA("rootA"); 

         
         
        JAXBContext context; 
        try { 
            context = JAXBContext.newInstance(RootClass.class); 

            Marshaller mar = context.createMarshaller(); 

            mar.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,
true); 
            mar.setProperty(Marshaller.JAXB_ENCODING,
"UTF-8"); 
             
            StringWriter writer = new StringWriter(); 

             
            mar.marshal(rc, writer); 
             
            System.out.println(writer.toString()); 

        } catch (JAXBException e) { 

            e.printStackTrace(); 
        } 
         
    } 
} 
 
 
package test.bean; 
 
import javax.xml.bind.annotation.XmlElement; 

import javax.xml.bind.annotation.XmlRootElement; 

 
@XmlRootElement(name="rootclass") 

public class RootClass { 

 
    private EleClassA a; 
    private EleClassB b; 

    private String root; 
    private String rootA; 

     
    @XmlElement(name="eleClassA") 

    public EleClassA getA() { 

        return a; 

    } 
    public void setA(EleClassA a) { 

        this.a = a; 
    } 
    @XmlElement(name="EleclassA") 

    public EleClassB getB() { 

        return b; 
    } 
    public void setB(EleClassB b) { 

        this.b = b; 

    } 
    public String getRoot() { 

        return root; 
    } 
    public void setRoot(String root) { 

        this.root = root; 

    } 
    public String getRootA() { 

        return rootA; 
    } 
    public void setRootA(String rootA) { 

        this.rootA = rootA; 

    } 
     
} 
 
 
package test.bean; 

 
import javax.xml.bind.annotation.XmlAttribute; 

import javax.xml.bind.annotation.XmlElement; 

 
public class EleClassA { 

 
    private String eleA; 
    private String eleB; 

     
    private String attrC; 

 
    @XmlElement 

    public String getEleA() { 

        return eleA; 

    } 
 
    public void setEleA(String eleA) { 

        this.eleA = eleA; 

    } 
 
    @XmlElement(name="elebnewname") 

    public String getEleB() { 

        return eleB; 
    } 
 
    public void setEleB(String eleB) { 

        this.eleB = eleB; 
    } 
 
    @XmlAttribute() 

    public String getAttrC() { 

        return attrC; 

    } 
 
    public void setAttrC(String attrC) { 

        this.attrC = attrC; 

    } 
     
} 
 
 
package test.bean; 

 
import javax.xml.bind.annotation.XmlAttribute; 

import javax.xml.bind.annotation.XmlElement; 

 
public class EleClassB { 

 
    private String attrUserName; 

    private String attrPassword; 

     
    private String eleCode; 

     
    @XmlAttribute 

    public String getAttrUserName() { 

        return attrUserName; 

    } 
    public void setAttrUserName(String attrUserName) { 

        this.attrUserName = attrUserName; 

    } 
    @XmlAttribute(name="password") 

    public String getAttrPassword() { 

        return attrPassword; 

    } 
    public void setAttrPassword(String attrPassword) { 

        this.attrPassword = attrPassword; 

    } 
    @XmlElement 

    public String getEleCode() { 

        return eleCode; 

    } 
    public void setEleCode(String eleCode) { 

        this.eleCode = eleCode; 

    } 
     
     
} 

package test;

import java.io.StringWriter;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;

import test.bean.EleClassA;
import test.bean.EleClassB;
import test.bean.RootClass;

public class Test1 {

public static void main(String[] args) {
RootClass rc = new RootClass();
EleClassA a = new EleClassA();
EleClassB b = new EleClassB();

a.setAttrC("attrc");
a.setEleA("eleA");
a.setEleB("eleB");

b.setAttrPassword("attrPassword");
b.setAttrUserName("attrUsrName");
b.setEleCode("eleCode");

rc.setA(a);
rc.setB(b);
rc.setRoot("root");
rc.setRootA("rootA");

JAXBContext context;
try {
context = JAXBContext.newInstance(RootClass.class);
Marshaller mar = context.createMarshaller();
mar.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
mar.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");

StringWriter writer = new StringWriter();

mar.marshal(rc, writer);

System.out.println(writer.toString());
} catch (JAXBException e) {
e.printStackTrace();
}

}
}

package test.bean;

import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name="rootclass")
public class RootClass {

private EleClassA a;
private EleClassB b;
private String root;
private String rootA;

@XmlElement(name="eleClassA")
public EleClassA getA() {
return a;
}
public void setA(EleClassA a) {
this.a = a;
}
@XmlElement(name="EleclassA")
public EleClassB getB() {
return b;
}
public void setB(EleClassB b) {
this.b = b;
}
public String getRoot() {
return root;
}
public void setRoot(String root) {
this.root = root;
}
public String getRootA() {
return rootA;
}
public void setRootA(String rootA) {
this.rootA = rootA;
}

}

package test.bean;

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;

public class EleClassA {

private String eleA;
private String eleB;

private String attrC;

@XmlElement
public String getEleA() {
return eleA;
}

public void setEleA(String eleA) {
this.eleA = eleA;
}

@XmlElement(name="elebnewname")
public String getEleB() {
return eleB;
}

public void setEleB(String eleB) {
this.eleB = eleB;
}

@XmlAttribute()
public String getAttrC() {
return attrC;
}

public void setAttrC(String attrC) {
this.attrC = attrC;
}

}

package test.bean;

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;

public class EleClassB {

private String attrUserName;
private String attrPassword;

private String eleCode;

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@XmlAttribute
public String getAttrUserName() {
return attrUserName;
}
public void setAttrUserName(String attrUserName) {
this.attrUserName = attrUserName;
}
@XmlAttribute(name="password")
public String getAttrPassword() {
return attrPassword;
}
public void setAttrPassword(String attrPassword) {
this.attrPassword = attrPassword;
}
@XmlElement
public String getEleCode() {
return eleCode;
}
public void setEleCode(String eleCode) {
this.eleCode = eleCode;
}

}

运行Test1类中main方法，执行结果：

[html]
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<?xml
version="1.0"
encoding="UTF-8"
standalone="yes"?> 

<rootclass> 

    <eleClassA
attrC="attrc"> 

        <eleA>eleA</eleA> 

        <elebnewname>eleB</elebnewname> 

    </eleClassA> 

    <EleclassA
attrUserName="attrUsrName"
password="attrPassword"> 

        <eleCode>eleCode</eleCode> 

    </EleclassA> 

    <root>root</root> 

    <rootA>rootA</rootA> 

</rootclass>