commons-digester来解析xml2

本文来自CSDN博客：http://blog.csdn.net/pengchua/archive/2010/03.aspx
Digester不是一个XML Parser，它只是对SAX更高层次上的一个封装使用Digester，将XML映射成javaBean. 我们无须了解SAX和DOM的解析过程，只要给Digester添加一些解析规则，就能对一个xml文件进行解析。Digester使用堆栈来保存xml节点（stack.push()方法），当该xml节点中嵌套的所有子节点解析完毕，该节点将被弹出（stack.pup()方法）
Digester最大的优点就是使用模式匹配来表示xml文件中节点之间的父子关系
实例代码如下:

package digester;
public class Student ...{
    private String name;
    private String from;
    private String course;
    public Student() ...{
    }
    public String getName() ...{
        return name;
    }
    public void setName(String newName) ...{
        name = newName;
    }
    public String getCourse() ...{
        return course;
    }
    public void setCourse(String newCourse) ...{
        course = newCourse;
    }
    public String toString() ...{
        return("Name="+this.name + " & Course=" +  this.course+" & from="+from);
    }
    public String getFrom() ...{
        return from;
    }
    public void setFrom(String from) ...{
        this.from = from;
    }
}
package digester;

import java.util.Vector;

public class StuClass ...{
    private String name;
    private Vector students = new Vector();
    public String getName() ...{
        return name;
    }
    public void setName(String name) ...{
        this.name = name;
    }
    public Vector getStudents() ...{
        return students;
    }
    public void setStudents(Vector students) ...{
        this.students = students;
    }
    public void addStudent(Student student) ...{
        students.add(student);
    }
}
<?xml version="1.0" encoding="UTF-8" ?>

<stuClass  name="fddfdf">
        <student>
                <name  from="cn">Java Boy</name>
                <course>JSP</course>
        </student>
        <student>
                <name>Java Girl</name>
                <course>EJB</course>
        </student>
</stuClass>


package digester;

import java.util.Vector;

import org.apache.commons.digester.Digester;

public class DigestStudents ...{
    Vector stuClass;
    public DigestStudents() ...{
        stuClass= new Vector();
    }
    public static void main(String[] args) ...{
        DigestStudents digestStudents = new DigestStudents();
        digestStudents.digest();
    }
    private void digest() ...{
        try ...{
            Digester digester = new Digester();
            //Push the current object onto the stack
            digester.setValidating(false);
            //Creates a new instance of the Student class
            digester.addObjectCreate("stuClass", "digester.StuClass");
            digester.addSetProperties("stuClass","name","name");
            digester.addObjectCreate( "stuClass/student", "digester.Student" );
            //Uses setName method of the Student instance
            //Uses tag name as the property name
            //addCallMethod与addBeanPropertySetter等价
            // 参数 0代表一个参数，默认就是当前读的数据,最后一个参数0表示参数个数
            digester.addCallMethod("stuClass/student/name", "setName",0);
            digester.addSetProperties("stuClass/student/name", "from","from");
            //加上一个属性名form
            //digester.addBeanPropertySetter( "stuClass/student/name");
            //Uses setCourse method of the Student instance
            //Explicitly specify property name as 'course'
            digester.addBeanPropertySetter( "stuClass/student/course");
            //Move to next student,addStudent为其中的一个方法
            digester.addSetNext( "stuClass/student", "addStudent","digester.Student" );
            StuClass ds = (StuClass) digester.parse(this.getClass()
                                .getClassLoader()
                                .getResourceAsStream("digester/students.xml"));
            //Print the contents of the Vector
            System.out.println("Students Vector "+ds.getName());
            System.out.println("Students Vector "+ds.getStudents());
        } catch (Exception ex) ...{
            ex.printStackTrace();
        }
    }
//    public void addStudent( Student stud ) {
//        //Add a new Student instance to the Vector
//        stuClass.add( stud );
//    }
}


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