如何修改xml中的内容__String_propertyCache_element_name_public_

当前位置: 技术问答>java相关

如何修改xml中的内容

来源: 互联网发布时间：2015-11-20

本文导语: one d:/xml two e:/two ------------------------------------ 会有很多项，如何修改one, two, 并且可以增加删除 | package util.common; import java.io.*; import java.util.*; import org.jdom.*; import org.jdom.input.*;...

   one
   d:/xml

   two
   e:/two

------------------------------------
会有很多项，如何修改one, two,
并且可以增加删除

package util.common;

import java.io.*;
import java.util.*;

import org.jdom.*;
import org.jdom.input.*;
import org.jdom.output.*;

public class XMLProperties
{
    private boolean autoSave = true;
    private File file;
    private Document doc;
    private Map propertyCache = new HashMap();

    public XMLProperties(String file, boolean autoSave, boolean validate)
            throws JDOMException
    {
        this.autoSave = autoSave;
        this.file = new File(file);
        SAXBuilder builder = new SAXBuilder(validate);
        try
        {
            doc = builder.build(file);
        }
        catch (JDOMException ex)
        {
            throw new JDOMException("构造过程出现错误！ " + ex);
        }
    }

    public XMLProperties(String file, boolean autoSave)   throws JDOMException
    {
        this(file, autoSave, false);
    }

    public XMLProperties(String file)   throws JDOMException
    {
        this(file, false, false);
    }

    public boolean isAutoSave() {  return autoSave; }

    public void setAutoSave(boolean autoSave)   {   this.autoSave = autoSave;   }

    public synchronized void saveProperties() throws IOException
    {
        if(autoSave == false)   return;

        XMLOutputter out = new XMLOutputter("    ",true, "GB2312");
        File temp = null;
        FileWriter writer = null;
        boolean isError = false;
        try
        {
            //先生成一个临时文件
            temp = new File(file.getParent(), file.getName() + ".tmp");
            writer = new FileWriter(temp);
            out.output(doc, writer);
        }
        catch (IOException ex)
        {
            isError = true;
            throw new IOException("生成临时文件出现错误！" + ex);
        }
        finally
        {
            writer.close();
        }
        //备份源文件，生成新文件
        if(isError == false)
        {
            File bak = new File(file.getParent(), file.getName() + ".bak");
            //删除原来的备份文件
            if(bak.exists())    bak.delete();
            boolean isSuccess = file.renameTo(bak);
            file.delete();
            //临时文件变成正式文件
            isSuccess = temp.renameTo(file);
            if(isSuccess == false)
                throw new IOException("备份文件过程出现错误！");
        }
    }

    public String getPorperty(String name)
    {
        if(propertyCache.containsKey(name))
            return propertyCache.get(name).toString();

        //查找指定的元素元素
        Element element = this.findOnly(name);
        if(element == null) return null;

        String value = element.getTextTrim();
        propertyCache.put(name, value);
        return value;
    }

    public String getPorperty(String name, String attr)
    {
        String nameAttr = name + ":" + attr;
        if(propertyCache.containsKey(nameAttr))
            return propertyCache.get(nameAttr).toString();

        //查找指定的元素元素
        Element element = this.findOnly(name);
        if(element == null) return null;

        String value = element.getAttributeValue(attr);
        propertyCache.put(nameAttr, value);
        return value;
    }

    public void setProperty(String name, String value) throws IOException
    {
        propertyCache.put(name, value);

        //查找指定的元素元素
        Element element = this.findCreate(name);
        element.setText(value);
        saveProperties();
    }

    public void setProperty(String name, String attr, String value) throws IOException
    {
        String nameAttr = name + ":" + attr;
        propertyCache.put(nameAttr, value);

        //查找指定的元素元素
        Element element = this.findCreate(name);
        element.setAttribute(attr, value);
        saveProperties();
    }

    public void deleteProperty(String name) throws IOException
    {
        if(propertyCache.containsKey(name))
            propertyCache.remove(name);

        Element element = this.findOnly(name);
        if(element != null)  element.detach();
        saveProperties();
    }

    public void deleteProperty(String name, String attr) throws IOException
    {
        String nameAttr = name + ":" + attr;
        if(propertyCache.containsKey(nameAttr))
            propertyCache.remove(nameAttr);

        Element element = this.findOnly(name);
        if(element != null) element.removeAttribute(attr);
        saveProperties();
    }

    public String[] getChildrenProperties(String parent)
    {
        //分解元素的名称
        String[] propName = parsePropertyName(parent);
        Element element = doc.getRootElement();
        //遍历搜索匹配的元素
        for (int i = 0; i