标签：tomcat xml apache digester 对象
Digester库Context context = new StandardContext(); Loader loader = new WebappLoader(); context.setLoader(loader);就完成了向context容器里添加WepappLoader的功能。
<?xml version="1.0" encoding="ISO-8859-1"?>
<employee firstName="Freddie" lastName="Mercury">
<office description="Headquarters">
<address streetName="Wellington Avenue" streetNumber="223"/>
</office>
</employee>在这个xml里面,根元素是employee,里面包含一个元素office,office里面又包含一个元素address。
employee是类名,程序会按照上面方法的第三个参数去employee元素里找对应的属性值作为要加载的类,当然如果找不到那个属性的话,就是有上面方法的第二个参数来加载。同样第二个参数可以使String类型的类名也可以使Class。
(employee,office,address都在文章的最后)
package ex15.pyrmont.digestertest;
import java.io.File;
import java.util.ArrayList;
import java.util.Iterator;
import org.apache.commons.digester.Digester;
public class Test02 {
public static void main(String[] args) {
String path = System.getProperty("user.dir") + File.separator +
"src"+File.separator + "etc";
File file = new File(path, "employee2.xml");
Digester digester = new Digester();
// add rules
digester.addObjectCreate("employee", "ex15.pyrmont.digestertest.Employee");
digester.addSetProperties("employee");
digester.addCallMethod("employee", "printName");
digester.addObjectCreate("employee/office", "ex15.pyrmont.digestertest.Office");
digester.addSetProperties("employee/office");
digester.addSetNext("employee/office", "addOffice");
digester.addObjectCreate("employee/office/address", "ex15.pyrmont.digestertest.Address");
digester.addSetProperties("employee/office/address");
digester.addSetNext("employee/office/address", "setAddress");
try {
Employee employee = (Employee) digester.parse(file);
ArrayList<?> offices = employee.getOffices();
Iterator<?> iterator = offices.iterator();
System.out.println("-------------------------------------------------");
while (iterator.hasNext()) {
Office office = (Office) iterator.next();
Address address = office.getAddress();
System.out.println(office.getDescription());
System.out.println("Address : " +
address.getStreetNumber() + " " + address.getStreetName());
System.out.println("--------------------------------");
}
}
catch(Exception e) {
e.printStackTrace();
}
}
}<?xml version="1.0" encoding="ISO-8859-1"?>
<employee firstName="Freddie" lastName="Mercury">
<office description="Headquarters">
<address streetName="Wellington Avenue" streetNumber="223"/>
</office>
<office description="Client site">
<address streetName="Downing Street" streetNumber="10"/>
</office>
</employee>至于最后的运行结果大家自己猜一下,然后运行一下看看。package ex15.pyrmont.digestertest;
import java.io.File;
import java.util.ArrayList;
import java.util.Iterator;
import org.apache.commons.digester.Digester;
public class Test03 {
public static void main(String[] args) {
String path = System.getProperty("user.dir") + File.separator +
"src"+File.separator + "etc";
File file = new File(path, "employee2.xml");
Digester digester = new Digester();
digester.addRuleSet(new EmployeeRuleSet()); //EmployeeRuleSet是什么东西?
try {
Employee employee = (Employee) digester.parse(file);
...... 与Test2一样
}
catch(Exception e) {
e.printStackTrace();
}
}
}package ex15.pyrmont.digestertest;
import org.apache.commons.digester.Digester;
import org.apache.commons.digester.RuleSetBase;
//一定要继承RuleSetBase
public class EmployeeRuleSet extends RuleSetBase {
//复写 addRuleInstances
public void addRuleInstances(Digester digester) {
// add rules
digester.addObjectCreate("employee", "ex15.pyrmont.digestertest.Employee");
digester.addSetProperties("employee");
digester.addObjectCreate("employee/office", "ex15.pyrmont.digestertest.Office");
digester.addSetProperties("employee/office");
digester.addSetNext("employee/office", "addOffice");
digester.addObjectCreate("employee/office/address","ex15.pyrmont.digestertest.Address");
digester.addSetProperties("employee/office/address");
digester.addSetNext("employee/office/address", "setAddress");
}
}package ex15.pyrmont.digestertest;
import java.util.ArrayList;
public class Employee {
private String firstName;
private String lastName;
private ArrayList<Office> offices = new ArrayList<Office>();
public Employee() {
System.out.println("Creating Employee");
}
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
System.out.println("Setting firstName : " + firstName);
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
System.out.println("Setting lastName : " + lastName);
this.lastName = lastName;
}
public void addOffice(Office office) {
System.out.println("Adding Office to this employee");
offices.add(office);
}
public ArrayList<Office> getOffices() {
return offices;
}
public void printName() {
System.out.println("My name is " + firstName + " " + lastName+"sssssssss");
}
}
package ex15.pyrmont.digestertest;
public class Office {
private Address address;
private String description;
public Office() {
System.out.println("..Creating Office");
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
System.out.println("..Setting office description : " + description);
this.description = description;
}
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
System.out.println("..Setting office address : " + address);
this.address = address;
}
}
package ex15.pyrmont.digestertest;
public class Address {
private String streetName;
private String streetNumber;
public Address() {
System.out.println("....Creating Address");
}
public String getStreetName() {
return streetName;
}
public void setStreetName(String streetName) {
System.out.println("....Setting streetName : " + streetName);
this.streetName = streetName;
}
public String getStreetNumber() {
return streetNumber;
}
public void setStreetNumber(String streetNumber) {
System.out.println("....Setting streetNumber : " + streetNumber);
this.streetNumber = streetNumber;
}
public String toString() {
return "...." + streetNumber + " " + streetName;
}
}
How tomcat works 读书笔记十五 Digester库
标签：tomcat xml apache digester 对象
原文地址：http://blog.csdn.net/dlf123321/article/details/41802443
