需要导入XStream的包
public class TestXstream {
/**单个对象转换为xml测试*/
@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,但是一般不用
stream.aliasField("pname",Person.class,"name");
//如果希望把某个子节点修改为xml中的属性也可以,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);
System.out.println(xml);
}
/**单个关联对象转换为xml测试*/
@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"));
String xml=stream.toXML(u);
System.out.println(xml);
}
/**List对象转换为xml测试*/
@Test
public void test03() {
XStream stream=new XStream();
stream.alias("user",User.class);
stream.alias("users",List.class);
List<User> us=new ArrayList<User>();
us.add(new User(1,"劳动法","123",new Group(1,"财务处")));
us.add(new User(1,"张学友","123",new Group(1,"财务处")));
us.add(new User(1,"黎明","123",new Group(1,"财务处")));
us.add(new User(1,"郭富城","123",new Group(1,"物理系")));
String xml=stream.toXML(us);
System.out.println(xml);
}
/**属性List对象转换为xml测试*/
@Test
public void test04() {
XStream stream=new XStream();
stream.alias("user",User.class);
stream.alias("group",Group.class);
Group g=new Group();
/*默认情况在users这个节点中会封装一个users的父节点,然后才封装user
* 有些时候可能不需要users节点*/
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,"老玉","123456"));
String xml=stream.toXML(g);
System.out.println(xml);
}
/**xml转换为对象测试*/
@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());
}
/**xml转换为List对象测试*/
@Test
public void test06() {
XStream stream=new XStream();
stream.alias("user",User.class);
stream.alias("users",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.getUsername()+","+user.getPassword()+","
+user.getGroup().getName());
}
}
/**对象转换为json对象测试,转换json需要使用Jettison.jar*/
@Test
public void test07() {
XStream stream=new XStream(new JettisonMappedXmlDriver(){
/*通过覆盖以下方法可以有效删除json根节点,
* 一般不适用XStream来转换json,效率不高
* 效率比较高的是Jackson*/
@Override
public HierarchicalStreamWriter createWriter(Writer out) {
return new JsonWriter(out,JsonWriter.DROP_ROOT_MODE);
}
});
stream.alias("user",User.class);
stream.alias("group",Group.class);
Group g=new Group();
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,"老玉","123456"));
String xml=stream.toXML(g);
System.out.println(xml);
}
}
///////////////////////////////////////////////
工具库封装
public class XStreamUtil {
private static XStreamUtil util;
private XStreamUtil(){}
public static XStreamUtil getInstance(){
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,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.fromXML(xml);
}
}
服务端发送xml
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1.由于返回的是XML对象,需要为response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.getInstance().obj2xml(ps, alias);
//6.通过out写回去
//out.write(px.toString());
out.write(xml);
}
