java写入/读取xml

package com.plas.util;import java.io.FileWriter;import java.io.IOException;import java.util.HashMap;import java.util.List;import java.util.Map;import org.jdom.Attribute;import org.jdom.Document;import org.jdom.Element;import org.jdom.JDOMException;import org.jdom.input.SAXBuilder;import org.jdom.output.Format;import org.jdom.output.XMLOutputter;import com.plas.pojo.bean.SysAreacate;import com.plas.pojo.bean.SysNewsCate;import com.plas.pojo.bean.SysNewsSource;public class AnalysisXML {//指定xml解析器,设置默认解析器private SAXBuilder builder;private Document document;private Element roots;private String xmlpath ; /** * 初始化信息 * @param xmlpath */public AnalysisXML(String xmlpath){builder = new SAXBuilder(false);try {document = builder.build(xmlpath);} catch (JDOMException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}//获得xml文档roots = document.getRootElement();//获得根元素this.xmlpath = xmlpath;}public AnalysisXML(){}/** * 删除 * @param cateid * @return */public String delete(String cateCode){Element ele =null;deleteXml(roots.getChildren("cate"),cateCode);saveXml();return null;}public String delete(Long cateCode){Element ele =null;deleteXml(roots.getChildren("cate"),cateCode);saveXml();return null;}/** * 递归查找xml * @param sublist * @param conint * @return */public Element recursiveXml(List sublist,String catecode){if(catecode.equals("0")) return roots;if(sublist==null) return null;Element ele = null;for(int i=0;i<sublist.size();i++){ele = (Element)sublist.get(i);if(ele.getAttributeValue("id").equals(catecode)){return ele;//返回结果集}else{ele = recursiveXml(ele.getChildren("cate"),catecode);if(ele!=null && ele.getAttributeValue("id").equals(catecode))return ele;//返回结果集}}return null;}/** * 递归查找xml * @param sublist * @param conint * @return */public Element recursivenewsXml(List sublist,Long cateid){if(cateid==0) return roots;if(sublist==null) return null;Element ele = null;for(int i=0;i<sublist.size();i++){ele = (Element)sublist.get(i);if(Integer.parseInt(ele.getAttributeValue("id"))==cateid){return ele;//返回结果集}else{ele = recursivenewsXml(ele.getChildren("cate"),cateid);if(ele!=null && Integer.parseInt(ele.getAttributeValue("id"))==cateid)return ele;//返回结果集}}return null;} /** * 递归查找删除 * @param sublist * @param cateid * @return */public int deleteXml(List sublist,String cateCode){Element ele = null;for(int i=0;i<sublist.size();i++){ele = (Element)sublist.get(i);if(cateCode.equals(ele.getAttributeValue("id"))){sublist.remove(i);}else{int j = deleteXml(ele.getChildren("cate"),cateCode);if(j!=0)ele.getChildren("cate").remove(j);//返回结果集}}return 0;}public int deleteXml(List sublist,Long cateCode){Element ele = null;for(int i=0;i<sublist.size();i++){ele = (Element)sublist.get(i);if(cateCode==Integer.parseInt(ele.getAttributeValue("id"))){sublist.remove(i);}else{int j = deleteXml(ele.getChildren("cate"),cateCode);if(j!=0)ele.getChildren("cate").remove(j);//返回结果集}}return 0;}/** * 更改xml的内容 * */public void saveXml(){Format format = Format.getCompactFormat();format.setEncoding("gb2312");//设置文本编码format.setIndent("");//设置换行缩进FileWriter writer;XMLOutputter output;try {writer = new FileWriter(xmlpath);output = new XMLOutputter(format);output.output(document, writer);writer.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}/** * 行政地区设置 生成返回页面的xml * */public String getareacate(List list){List cate = null;StringBuffer buffer=new StringBuffer();for(int i=0;i<list.size();i++){if(((SysAreacate)list.get(i)).getFatherid().equals("0")){cate=roots.getChildren("cate");}else{cate=recursiveXml(roots.getChildren("cate"),((SysAreacate)list.get(i)).getCatecode()).getChildren("cate");}for(int j=0;cate!=null&&j<cate.size();j++){Element ele=(Element)cate.get(j);buffer.append("<cate><id>").append(ele.getAttributeValue("id")).append("</id>").append("<name>").append(ele.getChild("name").getText()).append("</name>").append("<down>").append(ele.getChild("down").getText()).append("</down>").append("<catecode>").append(ele.getChild("catecode").getText()).append("</catecode>").append("</cate>");}}buffer.append("</cates>");return buffer.toString();}public String findbyid(long id){return recursivenewsXml(roots.getChildren("cate"),id).getChild("name").getText();}public String findbyid(String code){return recursiveXml(roots.getChildren("cate"),code).getChild("name").getText();}public String findcode(long id){return recursivenewsXml(roots.getChildren("cate"),id).getChild("code").getText();}public String findcode(String code){return recursiveXml(roots.getChildren("cate"),code).getChild("code").getText();}public String oneElement(Long id){//Element ele = recursiveXml(roots.getChildren("cate"),id);//StringBuffer buffer = new StringBuffer("<cates><cate>");//buffer//.append("<name>")//.append(ele.getChild("name").getText())//.append("</name>")//.append("<id>")//.append(ele.getChild("id").getText())//.append("</id>")//.append("<website>")//.append(ele.getChild("website").getText())//.append("</website>");//buffer.append("</cate></cates>");return "";}public Document getDocument(String xmlpath) {builder = new SAXBuilder(false);try {document = builder.build(xmlpath);} catch (JDOMException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}//获得xml文档return document;}/** * 查找某个元素 * @param id * @return */public Element getOneElement(long id){return recursivenewsXml(roots.getChildren("cate"),id);}public Element getOneElement(String code){return recursiveXml(roots.getChildren("cate"),code);}}

JAVA类调用时：

////////////删除////////////////////public String deleteXML(){List list=selectforfatherid("0");if(!list.isEmpty()){for(int i=0;i<list.size();i++){AnalysisXML analysisXML = new AnalysisXML(ServletActionContext.getRequest().getRealPath("/xmldata")+"//areaCate.xml"); analysisXML.delete(((SysAreacate)list.get(i)).getCatecode());}}return null;} ///////////保存/////////////////////public String save(List list) { SysAreacate fathercate=null; //analysisXML.delete("086");//查询父记录 if(list.isEmpty()){}else{for(int i=0;i<list.size();i++){fathercate=(SysAreacate)list.get(i);fathercate.setUptime(new Date());fathercate.setDown(new Long(0));fathercate.setCatecode(fathercate.getCatecode().toLowerCase()); TestAreacate t = new TestAreacate();fathercate.setCntospell(t.getFullSpell(fathercate.getCatename()));if(fathercate==null)fathercate.setDepth(new Long(1));//一级目录else{fathercate.setDown(fathercate.getDown()+1);//下级目录加1fathercate.setDepth(fathercate.getDepth()+1);//sys.save(fathercate);} AnalysisXML analysisXML = new AnalysisXML(ServletActionContext.getRequest().getRealPath("/xmldata")+"//areaCate.xml"); analysisXML.update(fathercate.getCatecode(),fathercate.getCatename(),fathercate.getCatecode(),fathercate.getFatherid(),2);}for(int i=0;i<list.size();i++){List newlist=sysAreacateDAO.findByFatherid(((SysAreacate)list.get(i)).getCatecode());save(newlist);}} return null;}