xStream可以轻易的将Java对象和xml文档相互转换,而且可以修改某个特定的属性和节点名称,而且也支持json的转换;
1.建立动态web工程。
2.编写model类。
package org.itat.zttc.model; public class Person { private int id; private String name; private double salary; private int age; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public double getSalary() { return salary; } public void setSalary(double salary) { this.salary = salary; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public Person(int id,String name,double salary,int age) { super(); this.id = id; this.name = name; this.salary = salary; this.age = age; } public Person() { } }
package org.itat.zttc.model; import java.util.ArrayList; import java.util.List; public class Group { private int id; private String name; List<User> users; public void addUser(User u) { if(users==null) { users = new ArrayList<User>(); } users.add(u); } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Group(int id,String name) { super(); this.id = id; this.name = name; } public Group() { } }
package org.itat.zttc.model; public class User { private int id; private String username; private String password; private Group group; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public Group getGroup() { return group; } public void setGroup(Group group) { this.group = group; } public User() { } public User(int id,String username,String password,Group group) { super(); this.id = id; this.username = username; this.password = password; this.group = group; } public User(int id,String password) { super(); this.id = id; this.username = username; this.password = password; } }
3导入xstream的包
4.编写测试类
package org.itat.zttc.test; import java.io.Writer; import java.util.ArrayList; import java.util.List; import org.itat.zttc.model.Group; import org.itat.zttc.model.Person; import org.itat.zttc.model.User; import org.junit.Test; import com.thoughtworks.xstream.XStream; import com.thoughtworks.xstream.io.HierarchicalStreamWriter; import com.thoughtworks.xstream.io.json.JettisonMappedXmlDriver; import com.thoughtworks.xstream.io.json.JsonWriter; public class TestXstream { @Test public void test01() { //1、创建XStream对象 XStream stream = new XStream(); //默认的名称使用的是包的名称可以通过alias改别名 stream.alias("person",Person.class); //改属性名也是可以的,一般不用 stream.aliasField("username",Person.class,"name"); //如果希望把某个子节点修改为属性也可以,但是更不常用 stream.useAttributeFor(Person.class,"id"); //2、创建对象 Person p = new Person(1,"小武",1900,24); //3、完成转换 String xml = stream.toXML(p); //4、输出 System.out.println(xml); } @Test public void test02() { XStream stream = new XStream(); stream.alias("user",User.class); stream.alias("group",Group.class); User u = new User(1,"劳动法","123",new Group(1,"财务处")); System.out.println(stream.toXML(u)); } @Test public void test03() { XStream stream = new XStream(); stream.alias("user",User.class); stream.alias("users",List.class); List<User> us = new ArrayList<User>(); User u = new User(1,"财务处")); us.add(u); us.add(new User(2,"张学友","财务处"))); us.add(new User(3,"黎明","财务处"))); us.add(new User(4,"郭富城","物理系"))); System.out.println(stream.toXML(us)); } @Test public void test04() { XStream stream = new XStream(); stream.alias("user",Group.class); Group g = new Group(); /* * 默认情况在users这个节点中会像封装一个users的父亲节点,然后才封装user * 有些时候可能不需要users可以使用 */ stream.addImplicitCollection(Group.class,"users"); g.addUser(new User(1,"老张","123")); g.addUser(new User(2,"老李","1234")); g.addUser(new User(3,"老刘","12345")); g.addUser(new User(4,"老王","123456")); System.out.println(stream.toXML(g)); } @Test public void test05() { XStream stream = new XStream(); stream.alias("user",User.class); String xml = "<user><id>1</id><username>aaa</username><password>123</password>" + "<group><id>1</id><name>财务处</name></group></user>"; User user = (User)stream.fromXML(xml); System.out.println(user.getId()+","+user.getUsername()+","+user.getPassword()+","+user.getGroup().getName()); } @Test public void test06() { XStream stream = new XStream(); stream.alias("user",List.class); List<User> us = (List<User>)stream.fromXML(TestXstream.class.getClassLoader().getResourceAsStream("users.xml")); for(User user:us) { System.out.println(user.getId()+","+user.getGroup().getName()); } } @Test public void test07() { //转换json需要使用Jettison这个包 XStream stream = new XStream(new JettisonMappedXmlDriver(){ //通过覆盖以下方法可以有效的删除json根节点 //一般不使用XStream来转换json,效率不高,效率比较高的Json工具是Jaskson @Override public HierarchicalStreamWriter createWriter(Writer out) { return new JsonWriter(out,JsonWriter.DROP_ROOT_MODE); } }); stream.alias("group",Group.class); stream.alias("user",User.class); Group g = new Group(); g.addUser(new User(1,"123456")); System.out.println(stream.toXML(g)); } }
5.为test06添加测试文件users.xml
<?xml version="1.0" encoding="UTF-8"?> <users> <user> <id>1</id> <username>劳动法</username> <password>123</password> <group> <id>1</id> <name>财务处</name> </group> </user> <user> <id>2</id> <username>张学友</username> <password>123</password> <group> <id>1</id> <name>财务处</name> </group> </user> <user> <id>3</id> <username>黎明</username> <password>123</password> <group> <id>1</id> <name>财务处</name> </group> </user> <user> <id>4</id> <username>郭富城</username> <password>123</password> <group> <id>1</id> <name>物理系</name> </group> </user> </users>7.run as java applet察看一下测试结果吧。。。
8.可以把测试类中的文件编写成工具类,在需要使用时进行调用。
package org.itat.zttc.util; import java.util.Map; import java.util.Set; import com.thoughtworks.xstream.XStream; public class XStreamUtil { private static XStreamUtil util; private XStreamUtil(){} public static XStreamUtil getInstacne() { if(util==null) util = new XStreamUtil(); return util; } public String obj2xml(Object obj,Map<String,Class<?>> alias) { XStream stream = new XStream(); Set<String> keys = alias.keySet(); for(String key:keys) { stream.alias(key,alias.get(key)); } return stream.toXML(obj); } public Object xml2obj(String xml,alias.get(key)); } return stream.fromXML(xml); } }
9.编写PersonServlet 覆盖doget和dopost方法
package org.itat.zttc.ajax; import java.io.IOException; import java.io.Writer; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.itat.zttc.model.Person; import org.itat.zttc.util.XStreamUtil; /** * Servlet implementation class PersonServlet */ public class PersonServlet extends HttpServlet { private static final long serialVersionUID = 1L; Map<Integer,List<Person>> persons = new HashMap<Integer,List<Person>>(); /** * @see HttpServlet#HttpServlet() */ public PersonServlet() { super(); List<Person> ps = new ArrayList<Person>(); ps.add(new Person(1,"张三",1200,22)); ps.add(new Person(2,"李四",1300,23)); ps.add(new Person(3,"王五",1400,24)); persons.put(1,ps); ps = new ArrayList<Person>(); ps.add(new Person(11,"刘德华",12000,32)); ps.add(new Person(12,"周杰伦",13000,33)); ps.add(new Person(13,"张曼玉",14000,34)); ps.add(new Person(14,"梁朝伟",15000,35)); persons.put(2,ps); ps = new ArrayList<Person>(); ps.add(new Person(21,"孙悟空",22000,132)); ps.add(new Person(22,"猪八戒",23000,133)); ps.add(new Person(23,"沙和尚",24000,134)); ps.add(new Person(24,"唐和尚",25000,135)); persons.put(3,ps); } /** * @see HttpServlet#doGet(HttpServletRequest request,HttpServletResponse response) */ protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException { doPost(request,response); } /** * @see HttpServlet#doPost(HttpServletRequest request,HttpServletResponse response) */ protected void doPost(HttpServletRequest request,IOException { //1、由于返回的是xml,需要为respose设置contentType response.setContentType("text/xml;charset=utf-8"); //2、获取Writer Writer out = response.getWriter(); //3、获取部门id int did = Integer.parseInt(request.getParameter("did")); //4、获取用户列表对象, List<Person> ps = persons.get(did); //5、拼接xml /*StringBuffer px = new StringBuffer(); px.append("<persons>"); for(Person p:ps) { px.append("<person>"); px.append("<id>").append(p.getId()).append("</id>"); px.append("<name>").append(p.getName()).append("</name>"); px.append("<salary>").append(p.getSalary()).append("</salary>"); px.append("<age>").append(p.getAge()).append("</age>"); px.append("</person>"); } px.append("</persons>");*/ Map<String,Class<?>> alias = new HashMap<String,Class<?>>(); alias.put("persons",List.class); alias.put("person",Person.class); String xml = XStreamUtil.getInstacne().obj2xml(ps,alias); //6、通过out写回去 out.write(xml); } }
10.配置web.xml文件。
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <display-name>ajax01</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> <servlet> <description></description> <display-name>PersonServlet</display-name> <servlet-name>PersonServlet</servlet-name> <servlet-class>org.itat.zttc.ajax.PersonServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>PersonServlet</servlet-name> <url-pattern>/person.do</url-pattern> </servlet-mapping> </web-app>11.编写personXml.html
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <Meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> <script type="text/javascript"> window.onload = init; function init() { //1、获取部门节点 var dn = document.getElementById("dep"); //2、为该节点创建onchange dn.onchange = getPerson //3、创建一个getPerson的方法来处理事件 } function getPerson() { var did = this.value; //1、获取XMLHttpRequest; var xhr = createXMLHttpRequest(); //2、通过xhr来打开页面,使用POST xhr.open("POST","person.do",true); xhr.onreadystatechange = function() { //3、处理请求 if(xhr.readyState==4&&xhr.status==200) { //3.1、获取xml节点 var xmlDoc = xhr.responseXML; //由于response的contentType是text/xml类型,此时就只能获取节点 //alert(xhr.resonseText); //3.2、获取所有的person节点 var pns = xmlDoc.getElementsByTagName("person"); //3.3、遍历所以节点,获取id,name等信息 var node = ""; for(var i=0;i<pns.length;i++) { node+=getValueByProp(pns[i],"id")+"----------"+ getValueByProp(pns[i],"name")+"----------"+ getValueByProp(pns[i],"salary")+"----------"+ getValueByProp(pns[i],"age")+"<br/>" } //3.4、写入到persons document.getElementById("persons").innerHTML = node; } } xhr.setRequestHeader("Content-type","application/x-www-form-urlencoded"); xhr.send("did="+did); //4、发送信息,需要传入did } //根据节点获取值 function getValueByProp(node,prop) { return (node.getElementsByTagName(prop))[0].firstChild.nodeValue; } function createXMLHttpRequest() { if(window.XMLHttpRequest) { //针对其他主流浏览器 return new XMLHttpRequest(); } else if(window.ActiveXObject) { //针对IE5和IE6 return new ActiveXObject("Microsoft.XMLHTTP"); } else { alert("你使用的浏览器不支持XMLHttpRequest,请换一个浏览器再试!"); return null; } } </script> </head> <body> <select id="dep"> <option value="1">普通组</option> <option value="2">明星组</option> <option value="3">火星组</option> </select> <div id="persons"></div> </body> </html>
12.在浏览器中访问http://localhost:8080/ajax01/person.do?did=2察看一下测试结果吧。
以上就是xstream的简单使用
原文链接:https://www.f2er.com/ajax/163851.html