休息食客

假如有一個(gè)字符串的內(nèi)容是xml格式，如：

        String aa = "<row>"+
                      "<user>"+
                        "<userid>1000</userid>"+
                        "<username>aaa</username>"+
                        "</user>"+
                      "<user>"+
                        "<userid>1001</userid>"+
                        "<username>bbb</username>"+
                      "</user>"+
                    "</row>";

這是一個(gè)字符串，不是一個(gè)XML文檔，只是該字符串里面的內(nèi)容是XML格式，該怎么解析呢？
假如我有一個(gè)User對(duì)象，有userid和username屬性，然后把該字符串里面的數(shù)據(jù)解析到User對(duì)象來(lái)。
思路：把該字符串先解析為docment樹(shù)形文檔，然后獲取根元素row，再然后獲取根元素的第一個(gè)子元素user,然后獲取user元素的第一個(gè)子元素userid并把該值存入user對(duì)象里
看代碼：

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;

public class test {    

    /** *//**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub

        String aa = "<row>"+
                      "<user>"+
                        "<userid>1000</userid>"+
                        "<username>aaa</username>"+
                        "</user>"+
                      "<user>"+
                        "<userid>1001</userid>"+
                        "<username>bbb</username>"+
                      "</user>"+
                    "</row>";
        test t = new test();
        List<User> lu = new ArrayList<User>();
        User user = new User();
        lu = t.Analysis(aa, lu, user);
        for(User u : lu){;
            System.out.println(u.getUserid()+"  "+u.getUsername());
        }
    }
    
    public test(){
        
    }
    
    public List<User> Analysis(String s,List<User> lu,User user){
        Document doc = null;             
        try {
            doc = DocumentHelper.parseText(s);// 將字符串轉(zhuǎn)為document樹(shù)形格式
        } catch (DocumentException e) {
            e.printStackTrace();
        }         
        Element rootElt = doc.getRootElement(); // 獲取根節(jié)點(diǎn)
        Iterator iter = rootElt.elementIterator("user"); // 獲取根節(jié)點(diǎn)下的子節(jié)點(diǎn)user
        while (iter.hasNext()) {
            user = new User();
            Element recordEle = (Element) iter.next();
            Iterator iters = recordEle.elementIterator("userid"); // 獲取子節(jié)點(diǎn)user下的子節(jié)點(diǎn)userId
            while(iters.hasNext()){
                Element userId = (Element) iters.next();
                user.setUserid(Long.parseLong(userId.getText()));
            }
            iters = recordEle.elementIterator("username"); // 獲取子節(jié)點(diǎn)user下的子節(jié)點(diǎn)username
            while(iters.hasNext()){
                Element username = (Element) iters.next();
                user.setUsername(username.getText());
            }
            lu.add(user);
        } 
        return lu;
    }

}

class User {
    private Long userid;
    private String username;
    public Long getUserid() {
        return userid;
    }
    public void setUserid(Long userid) {
        this.userid = userid;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }    
}

整個(gè)解析過(guò)程及思路在Analysis方法里面，注釋寫(xiě)清楚了，可以自己去琢磨！