dom麻烦的写法 --> 原来已经有写好的库

标签：Exception temp dom -- list System println 写法 out

自己写的:

1 保证null时,或是异常时,也要保存成默认值,如字符串是"",int是0

2 getNodeValue有throw异常,无需要往上级throw直接压掉;

所以代码写起来很长一节.有点郁闷.

---------

private void parseUserInfo(boolean flush) throws Exception {
        //把一级的节点键值放到对应成员变量上
        if (! flush && (this.reader.getUserInfo() != null) ){
            return ;//已获取,不必更新
        }
        
        Element node = new Api(_this.reader).get_user_info();
        
        if ( ! "member".equalsIgnoreCase(node.getTagName())){
            throw new Exception("提取会员资料出错:xml内容不包含会员资料,或格式已变更");
        }
        
        Hashtable userInfo = new Hashtable();
        
        NodeList list = node.getElementsByTagName("userID");
        
        try{

            if (list.getLength() > 0){
                int uid = 0;
                
                try{
                    uid = Integer.parseInt(list.item(0).getFirstChild().getNodeValue());
                }catch(  Exception e){
                    System.out.println("tip>parseUserInfo uid " + e);
                    uid = 0;
                }
                
                userInfo.put("id", new Integer(uid));
            }
            
            list = node.getElementsByTagName("username");
            
            if (list.getLength() > 0){

                String temp = null;
                
                try{
                    temp = list.item(0).getFirstChild().getNodeValue();
                }catch(  Exception e){
                    System.out.println("tip>parseUserInfo username " + e);
                }finally{
                    if (null == temp) temp = "";
                }
                
                userInfo.put("name", temp);
            }
            
            list = node.getElementsByTagName("realName");
            
            if (list.getLength() > 0){

                String temp = null;
                
                try{
                    temp = list.item(0).getFirstChild().getNodeValue();
                }catch(  Exception e){
                    System.out.println("tip>parseUserInfo username " + e);
                }finally{
                    if (null == temp) temp = "";
                }
                
                userInfo.put("real", temp );
            }
            
            list = node.getElementsByTagName("imoney");
            
            if (list.getLength() > 0){

                float temp = 0;
                
                try{
                    temp = Float.parseFloat(list.item(0).getFirstChild().getNodeValue());
                }catch(Exception e){
                    System.out.println("tip>parseUserInfo imoney " + e);
                    temp = 0;
                }
                
                userInfo.put("money", new Float(temp ) );
            }
            
            list = node.getElementsByTagName("isAuthor");
            
            if (list.getLength() > 0){

                boolean temp = false;
                
                try{
                    temp = list.item(0).getFirstChild().getNodeValue().trim().equals("0");
                }catch(Exception e){
                    System.out.println("tip>parseUserInfo isAuthor " + e);
                }
                
                userInfo.put("isAuth", new Boolean(temp) );
            }
            
            list = node.getElementsByTagName("userNumber");
            
            if (list.getLength() > 0){

                String temp = null;
                
                try{
                    temp = list.item(0).getFirstChild().getNodeValue();
                }catch(Exception e){
                    System.out.println("tip>parseUserInfo userNumber " + e);
                }finally{
                    if (null == temp) temp = "";
                }
                
                userInfo.put("no.", temp);
            }
            
            list = node.getElementsByTagName("gender");
            
            if (list.getLength() > 0){

                String temp = "保密";
                
                try{
                    if (list.item(0).getFirstChild().getNodeValue().trim().equals("1")){
                        temp =  "男";
                    }else if (list.item(0).getFirstChild().getNodeValue().trim().equals("1")){
                            temp =  "女";
                    }
                    
                }catch(Exception e){
                    System.out.println("tip>parseUserInfo gender " + e);
                }
                
                userInfo.put("sex", temp);
            }
            
            list = node.getElementsByTagName("qq");
            
            if (list.getLength() > 0){

                String temp = null;
                
                try{
                    temp = list.item(0).getFirstChild().getNodeValue();
                    
                }catch(Exception e){
                    System.out.println("tip>parseUserInfo qq " + e);
                }finally{
                    if (null == temp) temp = "";
                }
                
                userInfo.put("qq", temp);
            }
            
            list = node.getElementsByTagName("msn");
            
            if (list.getLength() > 0){

                String temp = null;
                
                try{
                    temp = list.item(0).getFirstChild().getNodeValue();
                    
                }catch(Exception e){
                    System.out.println("tip>parseUserInfo msn " + e);
                }finally{
                    if (null == temp) temp = "";
                }
                
                userInfo.put("msn", temp);
            }
            
            list = node.getElementsByTagName("phone");
            
            if (list.getLength() > 0){

                String temp = null;
                
                try{
                    temp = list.item(0).getFirstChild().getNodeValue();
                    
                }catch(Exception e){
                    System.out.println("tip>parseUserInfo phone " + e);
                }finally{
                    if (null == temp) temp = "";
                }
                
                userInfo.put("phone", temp);
            }
            
            list = node.getElementsByTagName("credit");
            
            if (list.getLength() > 0){

                int temp = 0;
                
                try{
                    temp = Integer.parseInt(list.item(0).getFirstChild().getNodeValue());
                    
                }catch(Exception e){
                    System.out.println("tip>parseUserInfo credit " + e);
                }
                
                userInfo.put("credit", new Integer(temp) );
            }
            
            list = node.getElementsByTagName("memberTitle");
            
            if (list.getLength() > 0){

                String temp = null;
                
                try{
                    temp = list.item(0).getFirstChild().getNodeValue();
                    
                }catch(Exception e){
                    System.out.println("tip>parseUserInfo title " + e);
                }finally{
                    if (null == temp) temp = "";
                }
                
                userInfo.put("title", temp );
            }
            
            list = node.getElementsByTagName("titleImage");
            
            if (list.getLength() > 0){

                String temp = null;
                
                try{
                    temp = list.item(0).getFirstChild().getNodeValue();
                    
                }catch(Exception e){
                    System.out.println("tip>parseUserInfo img " + e);
                }finally{
                    if (null == temp) temp = "";
                }
                
                userInfo.put("img", temp);
            }
            
            list = node.getElementsByTagName("level");
            
            if (list.getLength() > 0){

                int temp = 0;
                
                try{
                    temp = Integer.parseInt(list.item(0).getFirstChild().getNodeValue());
                    
                }catch(Exception e){
                    System.out.println("tip>parseUserInfo level " + e);
                }
                
                userInfo.put("level", new Integer(temp) );
            }
            
            list = node.getElementsByTagName("address");
            
            if (list.getLength() > 0){

                String temp = null;
                
                try{
                    temp = list.item(0).getFirstChild().getNodeValue();
                    
                }catch(Exception e){
                    System.out.println("tip>parseUserInfo addr " + e);
                }finally{
                    if (null == temp) temp = "";
                }
                
                userInfo.put("addr", temp);
            }
        }catch(Exception e){
            System.out.println("tip>parseUserInfo map.put " + e);
            throw new Exception("提取用户资料出错");
        }
        

        this.reader.setUserInfo(userInfo);
    }

---------

没心机为了实现这个而自己写一个统一的处理,在群中一问才知道.有人已经写好.系列成类中的成员的库

如xStream.

会自动的把xml系列成类中的成员变量;

这样就极其简单了

但是会有性能上的损失,因为通用性就损失性能

----

后来测试了一下,发现Xstream不适合bb使用.引用的不存在类太多了,修改没必要.

找到一个kxml2-min-2.3.0.jar,经过处理后就能使用.处理方式在后面文章中有

这个只是方便一点处理而已.但是却不能xml 2 class;

但是看了一下示例.发现还是要if(tagname) tagNameVar = tagValue形式;

还是没有一个统一的接口不需要判断,直接把xml转成变量

------

再找到sax2.

http://sourceforge.net/projects/sax/

回头看bb的api,发现已经有这东西......

看完了说明,发现它只是dom的替代品.只是内存使用上会更优.基于事件触发.

想了一下.发现还不适合多级的xml结构.要是想把多级的装到对象中时,会很麻烦;

测试代码:

package com.iximo.object;

import java.io.InputStream;

import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
import org.xml.sax.Attributes;
import org.xml.sax.helpers.XMLReaderFactory;
import org.xml.sax.helpers.DefaultHandler;


public class XmlSax extends DefaultHandler
{
    public XmlSax ()
    {
        super();
    }
    
    public void xmlParse (InputStream r)
    throws Exception
    {
        XMLReader xr = XMLReaderFactory.createXMLReader();
        XmlSax handler = new XmlSax();
        xr.setContentHandler(handler);//设置内容事件
        xr.setErrorHandler(handler);//设置出错事件,需要实现各个方法,否则使用默认的方法.有异常,警告等不同级别
        xr.parse(new InputSource(r));//解析流,可以是任何inputStream
    }

    public void startDocument (){
        System.out.println("tip>Start sax document");
    }


    public void endDocument () {
        System.out.println("tip>End sax document");
    }


    public void startElement (String uri, String name,
                  String qName, Attributes atts){
        if ("".equals (uri))
            System.out.println("Start element: " + qName);
        else
            System.out.println("Start element: {" + uri + "}" + name);
    }


    public void endElement (String uri, String name, String qName)
    {
    if ("".equals (uri))
        System.out.println("End element: " + qName);
    else
        System.out.println("End element:   {" + uri + "}" + name);
    }


    public void characters (char ch[], int start, int length)
    {
    System.out.print("Characters:    \"");
    for (int i = start; i < start + length; i++) {
        switch (ch[i]) {
        case '\\':
        System.out.print("\\\\");
        break;
        case '"':
        System.out.print("\\\"");
        break;
        case '\n':
        System.out.print("\\n");
        break;
        case '\r':
        System.out.print("\\r");
        break;
        case '\t':
        System.out.print("\\t");
        break;
        default:
        System.out.print(ch[i]);
        break;
        }
    }
    System.out.print("\"\n");
    }

}

-----

xml

<?xml version="1.0" encoding="UTF-8" ?><error><error_id>501</error_id><error_info>unthorize</error_info></error>

----输出

[0.0] tip>Start sax document
[0.0] Start element: error
[0.0] Start element: error_id
[0.0] Characters: "501"
[0.0] End element: error_id
[0.0] Start element: error_info
[0.0] Characters: "unthorize"
[0.0] End element: error_info
[0.0] End element: error
[0.0] tip>End sax document

-----

麻烦.没找到合适的....

标签：Exception,temp,dom,--,list,System,println,写法,out
From： https://blog.51cto.com/u_252283/6180647

dom麻烦的写法 --> 原来已经有写好的库

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