大部分程式員，平時工作中除了與bug相伴之外，想必也會很多種多樣的檔案打交道吧。當然,xml 就是其中之一，擷取互動資料,建立規則等等，都離不開他。xml是個非常強大的描述語言，相比而言,txt之流則功力較弱了些。
xml那麼重要，單解析xml的工作卻繁雜無聊。原因如下：解析xml工具繁雜,每個人掌握的東西不一樣;學習新工具又浪費時間;解析規則隻是個體力活。
程式員的辛苦，也就展現于此了。一般程式員總是抱怨忙啊忙，累啊累。我們作為程式員來說，更應該想一想想法設法吧東西提煉一下，減少重複的工作。 說這些題外話，是有原因的。我現在的大部分同僚，加班加點在哪加班，貌似很辛苦，看一下他們的工作，讓人很無奈。代碼是一大段一大段的寫，确實一晚上寫個百十行，是非常“有成就感”的。
如生成xml 檔案，用拼串的方式實作。一個小小的xml，往往都50多行。讓人很無語。
解析xml, 往往都需要有一套解析規則。而我們可以動态建立解析規則。讓後根據規則将xml檔案資料放到map中。思路簡單至極。其他擴充，暫時不考慮。
主要步驟 分為2部分
第一部分 使用digester實作可配置的規則樹結構
1) 規則節點對象
public class node{
private string nodename;
private list children = new arraylist();
/**
* 屬性清單,以逗号分隔
*/
private string attrs="";
public string getattrs() {
return attrs;
}
public void setattrs(string values) {
this.attrs= values;
public string getnodename() {
return nodename;
public void setnodename(string nodename) {
this.nodename = nodename;
public list getchildren() {
return children;
public void addchildren(node node) {
this.children.add(node);
@override
public string tostring() {
return this.nodename+":"+"have"+this.getchildren().size()+"子節點";
}
(2) 定義xml 解析規則檔案，當然也可以寫編碼實作。
<?xml version="1.0"?>
<!doctype digester-rules public "-//jakarta apache //dtd digester-rules xml v1.0//en" "http://jakarta.apache.org/commons/digester/dtds/digester-rules.dtd">
<digester-rules>
<pattern value="root">
<object-create-rule classname="com.aisino.common.parse.node"/>
<set-properties-rule />
<set-next-rule methodname="add"/>
<pattern value="level1">
<object-create-rule classname="com.aisino.common.parse.node"/>
<set-properties-rule />
<set-next-rule methodname="addchildren"/>
<pattern value="level2">
<!--
<call-method-rule methodname="setnodename" paramcount="1" paramtypes="java.lang.string"/>
<call-param-rule paramnumber="0"/>
-->
<pattern value="level3">
<object-create-rule classname="com.aisino.common.parse.node"/>
<set-properties-rule />
<set-next-rule methodname="addchildren"/>
<pattern value="level4">
<object-create-rule classname="com.aisino.common.parse.node"/>
<set-properties-rule />
<set-next-rule methodname="addchildren"/>
<pattern value="level5">
<object-create-rule classname="com.aisino.common.parse.node"/>
<set-properties-rule />
<set-next-rule methodname="addchildren"/>
</pattern>
</pattern>
</pattern>
<set-next-rule methodname="addchildren"/>
</pattern>
</pattern>
</pattern>
</digester-rules>
3) 規則解析類ruleloader
public class ruleloader {
private static final log logger = logfactory.getlog(ruleloader.class);
private url digesterrulesurl;
private url fileurl;
public ruleloader(string rulepath,string filepath){
digesterrulesurl= geturl(rulepath);
fileurl = geturl(filepath);
// digesterrulesurl= getclass().getclassloader().getresource(rulepath);
public ruleloader(url digesterrulesurl,url fileurl){
this.digesterrulesurl = digesterrulesurl;
this.fileurl = fileurl;
public static ruleloader getxmlruleloader(string filepath){
url url = geturl("classpath:com/aisino/common/parse/xml-rules.xml");
return new ruleloader(url,geturl(filepath));
*
* 自定義指定規則<br/>
* 需要對digester 解析規則熟悉
* @return
public list parserules(){
classloader classloader = getclass().getclassloader();
object root = new arraylist();
try {
digesterloader.load(digesterrulesurl, classloader, fileurl,root);
} catch (ioexception e) {
logger.error("ioexception");
} catch (saxexception e) {
logger.error("sax error");
} catch (digesterloadingexception e) {
logger.error("an error occurs while parsing xml into digester rules");
}
return (list)root;
* 解析xml資料，并将資料儲存至map
* 最多支援5級
* xml節點:主要表示root、level1,level2,level3,level4,level5<br/>
* for example:<br/>
* <root nodename="dataexchangepackage"><br/>
* <level1 nodename="envelopeinfo"><br/>
* <level2 nodename="sourceid" /><br/>
* <level2 nodename="destinationid" /><br/>
* <level2 nodename="destinationappid" /><br/>
* <level2 nodename="businesstype" /><br/>
* <level2 nodename="globalbusinessid" /><br/>
* </level1>
* <level1>
* ...
</root>
<br/>
約定 ${}為節點對應nodename值
${root} = dataexchangepackage
${level1}==envelopeinfo
${level2}==sourceid...
* @param input
* @return map
* 從map 擷取值
* 如果key 是葉子節點：則傳回string,反之,為map
* 如果想取sourceid的值，則key=/dataexchangepackage/envelopeinfo/sourceid
public static map reparserules(string filepath,inputstream input){
list rules = ruleloader.getxmlruleloader(filepath).parserules();
if(rules != null && rules.size()>0){
digester digester = new digester();
node root=(node)rules.get(0);//根節點
mapsetnextrule rule = new mapsetnextrule("put");
addrule2dister(digester, root,"", rule,true);
try {
map valuemap = new hashmap();
map parsemap = (map)digester.parse(input);
valuemap.putall(parsemap);
afterrootmap(parsemap,valuemap,"");
return valuemap;
} catch (ioexception e) {
e.printstacktrace();
} catch (saxexception e) {
}finally{
digester=null;
}
}
return null;
private static void afterrootmap(map valuemap,map destmap,string pattern){
string fullpattern="";
iterator keys = valuemap.keyset().iterator();
while(keys.hasnext()){
object key = keys.next();
object v = valuemap.get(key);
fullpattern= pattern+"/"+key;
if(v instanceof map){
afterrootmap((map)v,destmap,fullpattern);
}else{
logger.debug(fullpattern+">>>>對應元素>"+v+" 放入傳回棧中");
destmap.put(fullpattern, v);
}
}
private static url geturl(string resourcelocation){
try {
if (resourcelocation.startswith(resourcehelper.classpath_url_prefix)) {
return resourcehelper.geturl(resourcelocation);
} else if(resourcelocation.startswith(resourcehelper.file_url_prefix)) {
resourcelocation = stringutils.replace(resourcelocation, resourcehelper.file_url_prefix, "");
return new file(resourcelocation).touri().tourl();
} catch (exception e) {
logger.error("解析xml路徑時,出錯");
/**
* 遞歸添加解析規則
* @param digester
* @param node ：目前節點
* @param pattern:規則
* @param rule:支援map添加
* @param isroot 是否為根節點
*/
private static void addrule2dister(digester digester,node node,string pattern,mapsetnextrule rule,boolean isroot){
string fullpattern="";
if(stringutils.isnotblank(pattern)){
fullpattern = pattern+"/"+node.getnodename();
}else{
fullpattern = node.getnodename();
}
if(node.getchildren().size()>0){
logger.debug(" add rules >>> digester.addobjectcreate("+fullpattern+", hashmap.class);");
digester.addobjectcreate(fullpattern, hashmap.class);
if(stringutils.isnotblank(node.getattrs())){
string[] attrs =stringutils.split(node.getattrs(),",");
logger.debug(fullpattern+"有屬性:"+tostringbuilder.reflectiontostring(attrs));
for(int i=0;i<attrs.length;i++){
string attr= attrs[i];
logger.debug(" add rules >>> digester.addcallmethod("+fullpattern+",\"put\", 2)");
logger.debug(" add rules >>> digester.addobjectparam("+fullpattern+",0, "+attr+")");
logger.debug(" add rules >>> digester.addcallparam("+fullpattern+",1, "+attr+")");
digester.addcallmethod(fullpattern, "put", 2);
digester.addobjectparam(fullpattern, 0, attr);
digester.addcallparam(fullpattern, 1,attr);
}
if(!isroot){//不是根節點
logger.debug(" add rules >>> digester.addrule("+fullpattern+", rule);");
digester.addrule(fullpattern, rule);
for(int i=0;i<node.getchildren().size();i++){
node child = (node)node.getchildren().get(i);
addrule2dister(digester,child,fullpattern,rule,false);
//葉子節點
logger.debug("add rules >>> digester.addcallmethod("+fullpattern+", \"put\", 2)");
digester.addcallmethod(fullpattern, "put", 2);
logger.debug("add rules >>> digester.addobjectparam("+fullpattern+",0, "+node.getnodename()+")");
digester.addobjectparam(fullpattern, 0, node.getnodename());
logger.debug("add rules >>> digester.addcallparam("+fullpattern+",1)");
digester.addcallparam(fullpattern, 1);
...
xml閱讀器
public class xmlreader {
private static final log logger = logfactory.getlog(xmlreader.class);
private string rulepath;
private string filepath;
private ruleloader rule;
public xmlreader(string rulepath){
this.rulepath = rulepath;
public list read(string filepath){
rule = new ruleloader(this.rulepath,filepath);
return rule.parserules();
測試類
public static void main(string args[]) throws exception{
inputstream resourceasstream = thread.currentthread().getcontextclassloader().getresourceasstream("com/aisino/common/parse/101r.xml");
map m = ruleloader.reparserules("classpath:com/aisino/common/parse/xml-value-example.xml",resourceasstream);
system.out.println(m.get("/dataexchangepackage/envelopeinfo/destinationid"));
system.out.println(m.get("/dataexchangepackage/transferinfo/age"));
system.out.println(m.get("/dataexchangepackage/transferinfo/sex"));
}
測試規則檔案（定義xml解析規則）
暫時隻支援5級。當然可以無限增加至6級别,8級...
digester 好想不支援通配符吧。 在這一點确實沒有做到充分的可擴充。但是5級相當可以滿足應用了
<root nodename="dataexchangepackage">
<level1 nodename="envelopeinfo">
<level2 nodename="sourceid" />
<level2 nodename="destinationid" />
<level2 nodename="destinationappid" />
<level2 nodename="businesstype" />
<level2 nodename="globalbusinessid" />
</level1>
<level1 nodename="transferinfo" attrs="age,sex">
<level2 nodename="senderid" />
<level2 nodename="receiverid" />
<level2 nodename="isretry" />
<level2 nodename="sendtime" />
<level2 nodename="messageid" />
<level2 nodename="sourcemessageid" />
<level1 nodename="contentcontrol">
<level2 nodename="zip">
<level3 nodename="iszip"/>
</level2>
<level2 nodename="encrypt">
<level3 nodename="isencrypt"/>
<level2 nodename="code">
<level3 nodename="iscode"/>
<level1 nodename="packageinfo">
<level2 nodename="subpackage">
<level3 nodename="sequence"/>
<level3 nodename="content">
<level4 nodename="dj_nsrxx">
<level5 nodename="nsrsbh"/>
<level5 nodename="swjg_dm"/>
<level5 nodename="nsrdzdah"/>
<level5 nodename="nsrmc"/>
<level5 nodename="zjhm"/>
<level5 nodename="scjydz"/>
<level5 nodename="bsrmc"/>
<level5 nodename="dhhm"/>
<level5 nodename="djzclx_dm"/>
<level5 nodename="nsrzt_dm"/>
<level5 nodename="nsr_swjg_dm"/>
</level4>
</level3>
</level2>
<level1 nodename="returnstate">
<level2 nodename="returncode"></level2>
<level2 nodename="returnmessageid"></level2>
<level2 nodename="returnmessage"></level2>
</root>
測試資料
<?xml version="1.0" encoding="gbk"?>
<dataexchangepackage xmlns="http://www.chinatax.gov.cn/tirip/dataspec" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xsi:schemalocation="http://www.chinatax.gov.cn/tirip/dataspec/dataexchangepackage.xsd" version="sw5001">
<envelopeinfo>
<sourceid>sj</sourceid>
<destinationid>yd</destinationid>
<destinationappid>sjqz</destinationappid>
<businesstype>wlfp101</businesstype>
<globalbusinessid>sjwlfp1012012011100184241</globalbusinessid>
</envelopeinfo>
<transferinfo age="88777" sex="男">
<senderid>sj</senderid>
<receiverid>yd</receiverid>
<isretry/>
<sendtime>2012-01-11 13:14:57:759</sendtime>
<messageid>sjwlfp1012012011100184241</messageid>
<sourcemessageid/>
</transferinfo>
<contentcontrol>
<zip>
<iszip>false</iszip>
</zip>
<encrypt>
<isencrypt>false</isencrypt>
</encrypt>
<code>
<iscode>false</iscode>
</code>
</contentcontrol>
<packageinfo>
<subpackage>
<sequence>1</sequence>
<content>
<dj_nsrxx>
<nsrsbh>350583729702365</nsrsbh>
<swjg_dm>13505833100</swjg_dm><xgrq/>
<nsrdzdah>350502001008324</nsrdzdah>
<nsrmc>南安市水頭康利石材有限公司</nsrmc>
<zjhm>130302610511351</zjhm>
<scjydz>南安市水頭鎮西錦村</scjydz>
<bsrmc>陳姿穎</bsrmc>
<dhhm>6981988</dhhm>
<djzclx_dm>230</djzclx_dm>
<nsrzt_dm>21</nsrzt_dm>
<nsr_swjg_dm>13505833100</nsr_swjg_dm>
</dj_nsrxx>
</content>
</subpackage>
</packageinfo>
<returnstate>
<returncode>00</returncode>
<returnmessageid>ydwlfp1012012011100000001</returnmessageid>
<returnmessage>成功</returnmessage>
</returnstate>
</dataexchangepackage>
測試結果
/dataexchangepackage/envelopeinfo/destinationid>>>>yd
/dataexchangepackage/transferinfo/age>>>88777
/dataexchangepackage/transferinfo/age>>>男
轉載：http://dba10g.blog.51cto.com/764602/1179244
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