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android中xml的一些操作
解析类：
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// 构造方法
public xmlparser() {
}
/**
* 从url获取xml使http请求
*
* @param url
* string
* */
public string getxmlfromurl(string url) {
string xml = null;
try {
// defaulthttpclient
defaulthttpclient httpclient = new defaulthttpclient();
httppost httppost = new httppost(url);
httpresponse httpresponse = httpclient.execute(httppost);
httpentity httpentity = httpresponse.getentity();
xml = entityutils.tostring(httpentity, "utf-8");
} catch (unsupportedencodingexception e) {
e.printstacktrace();
} catch (clientprotocolexception e) {
e.printstacktrace();
} catch (ioexception e) {
e.printstacktrace();
}
return xml;
}
/**
* 获取xml dom元素
*
* @param xml
* string
* */
public document getdomelement(inputstream is) {
document doc = null;
documentbuilderfactory dbf = documentbuilderfactory.newinstance();
try {
documentbuilder db = dbf.newdocumentbuilder();
// inputsource is = new inputsource();
// is.setcharacterstream(new stringreader(xml));
doc = db.parse(is);
} catch (parserconfigurationexception e) {
log.e("error: ", e.getmessage());
return null;
} catch (saxexception e) {
log.e("error: ", e.getmessage());
return null;
} catch (ioexception e) {
log.e("error: ", e.getmessage());
return null;
}
return doc;
}
public document getdomdocumentupdate(string xml) {
document doc = null;
documentbuilderfactory dbf = documentbuilderfactory.newinstance();
try {
documentbuilder db = dbf.newdocumentbuilder();
inputsource is = new inputsource();
is.setcharacterstream(new stringreader(xml));
doc = db.parse(is);
} catch (parserconfigurationexception e) {
log.e("error: ", e.getmessage());
return null;
} catch (saxexception e) {
log.e("error: ", e.getmessage());
return null;
} catch (ioexception e) {
log.e("error: ", e.getmessage());
return null;
}
return doc;
}
/**
* 获取节点值
*
* @param elem
* element
*/
public final string getelementvalue(node elem) {
node child;
if (elem != null) {
if (elem.haschildnodes()) {
for (child = elem.getfirstchild(); child != null; child = child
.getnextsibling()) {
if (child.getnodetype() == node.text_node) {
return child.getnodevalue();
}
}
}
}
return "";
}
/**
* 获取节点值
*
* @param element
* node
* @param key
* string
* */
public string getvalue(element item, string str) {
nodelist n = item.getelementsbytagname(str);
return this.getelementvalue(n.item(0));
}
//xml文件有更新后，调用此方法
public void output(document node, string filename) {
transformerfactory transfactory = transformerfactory.newinstance();
try {
transformer transformer = transfactory.newtransformer();
// 设置各种输出属性
transformer.setoutputproperty("encoding", "utf-8");
transformer.setoutputproperty("indent", "yes");
domsource source = new domsource(node);
// 将待转换输出节点赋值给dom源模型的持有者(holder)
// /source.setnode(node);
streamresult result = new streamresult();
if (filename == null) {
// 设置标准输出流为transformer的底层输出目标
result.setoutputstream(system.out);
} else {
result.setoutputstream(new fileoutputstream(filename));
}
// 执行转换从源模型到控制台输出流
transformer.transform(source, result);
} catch (transformerconfigurationexception e) {
e.printstacktrace();
} catch (transformerexception e) {
e.printstacktrace();
} catch (filenotfoundexception e) {
e.printstacktrace();
}
}
public string writexml() {
xmlserializer xml = xml.newserializer();
stringwriter writer = new stringwriter();
try {
xml.setoutput(writer);
xml.startdocument("utf-8", true);
xml.starttag("", "blog");
xml.starttag("", "message");
xml.attribute("", "name", "xia");
xml.starttag("", "age");
xml.text("22");
xml.endtag("", "age");
xml.starttag("", "hobby");
xml.text("play");
xml.endtag("", "hobby");
xml.starttag("", "hight");
xml.text("165");
xml.endtag("", "hight");
xml.endtag("", "message");
xml.starttag("", "message");
xml.attribute("", "name", "chen");
xml.starttag("", "age");
xml.text("21");
xml.endtag("", "age");
xml.starttag("", "hobby");
xml.text("swin");
xml.endtag("", "hobby");
xml.starttag("", "hight");
xml.text("170");
xml.endtag("", "hight");
xml.endtag("", "message");
xml.endtag("", "blog");
xml.enddocument();
} catch (exception e) {
throw new runtimeexception(e);
}
return writer.tostring();
}
public boolean write(string filepath, string txt) {
fileoutputstream fos = null;
if (environment.getexternalstoragestate() != null) {// 这个方法在试探终端是否有sdcard!
file path = new file("sdcard/test");// 创建目录
file f = new file(filepath);// 创建文件
if (!path.exists()) {// 目录不存在返回false
path.mkdirs();// 创建一个目录
}
if (!f.exists()) {// 文件不存在返回false
try {
f.createnewfile();
fos = new fileoutputstream(f);
fos.write((txt).getbytes("utf-8"));
fos.close();
} catch (ioexception e) {
// todo auto-generated catch block
e.printstacktrace();
}// 创建一个文件
}
}
return true;
}
private static xmlparser uniqueinstance = null;
public static xmlparser getinstance() {
if (uniqueinstance == null) {
uniqueinstance = new xmlparser();
}
return uniqueinstance;
}
}
上面的这个类中用了单例！分别定义了xml的创建，获取xml的节点值，更新后执行的操作！
mainactivity：
public class mainactivity extends activity {
public static final string xmlpath = "sdcard/test/message.xml";
private button create = null;
@override
public void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.activity_main);
create = (button) findviewbyid(r.id.create);
}
// 自动创建xml
private void createxml() {
// sdcard/test/message.xml
xmlparser.getinstance().write(xmlpath,
xmlparser.getinstance().writexml());
}
// 遍历节点，找到特定节点并进行更换！
private void selectnode() {
document document = null;
try {
fileinputstream fin = new fileinputstream(xmlpath);
document = xmlparser.getinstance().getdomelement(fin);
node root = document.getdocumentelement();
if (root.haschildnodes()) {
nodelist ftpnodes = root.getchildnodes();
log.e("eee", root.getnodename());// 根节点 blog
for (int i = 0; i < ftpnodes.getlength(); i++) {
nodelist ftplist = ftpnodes.item(i).getchildnodes();
node su = ftpnodes.item(i);
log.e("eee", su.getnodename());// message
element e = (element) ftpnodes.item(i);
log.e("eee", e.getattribute("name"));// message= xia
for (int k = 0; k < ftplist.getlength(); k++) {
node subnode = ftplist.item(k);
log.e("eee",
" subnode.getnodename()"
+ subnode.getnodename());
log.e("eee",
"subnode.getnodetype()" + subnode.getnodetype());
log.e("eee", subnode.getfirstchild().getnodevalue());
if (subnode.getnodetype() == node.element_node
&& subnode.getnodename().equals("hight")) {
subnode.getfirstchild().setnodevalue("175");
xmlparser.getinstance().output(document, xmlpath);
}
}
}
}
} catch (exception e) {
}
}
// 添加一个新的根节点
private void insertnode() {
document document = null;
try {
fileinputstream fin = new fileinputstream(xmlpath);
document = xmlparser.getinstance().getdomelement(fin);
// 插入根节点message
/**
* <message name="wang"> <hight>180</hight> <age>22</age> </message>
*
* */
element eltstu = document.createelement("message");
element eltname = document.createelement("hight");
element eltage = document.createelement("age");
attr attr = document.createattribute("name");
attr.setvalue("wang");
text txtname = document.createtextnode("180");
text txtage = document.createtextnode("22");
eltname.appendchild(txtname);
eltage.appendchild(txtage);
eltstu.appendchild(eltname);
eltstu.appendchild(eltage);
eltstu.setattributenode(attr);
element eltroot = document.getdocumentelement();
eltroot.appendchild(eltstu);
xmlparser.getinstance().output(document, xmlpath);
} catch (exception e) {
}
}
private void instertchildnode() {
document document = null;
try {
fileinputstream fin = new fileinputstream(xmlpath);
document = xmlparser.getinstance().getdomelement(fin);
// 在某个根节点下面添加节点
/**
* <message name="wang"> <hight>180</hight> <age>22</age>
* <hobby>music</hobby>//这句是新添加的 </message>
*
* */
node root = document.getdocumentelement();
nodelist ftpnodes = root.getchildnodes();
log.e("eee", root.getnodename());// 根节点 blog
nodelist ftplist = ftpnodes.item(1).getchildnodes();
node su = ftpnodes.item(1);
log.e("eee", su.getnodename());// message
element e = (element) ftpnodes.item(5);// message= wang
log.e("eee", e.getattribute("name"));
if (e.getattribute("name").equals("wang")) {
element elthoby = document.createelement("hobby");
text txthoby = document.createtextnode("music");
elthoby.appendchild(txthoby);
node stnode = document.getelementsbytagname("message").item(2);
stnode.appendchild(elthoby);
}
xmlparser.getinstance().output(document, xmlpath);
} catch (exception e) {
}
}
private void removenode() {
document document = null;
try {
fileinputstream fin = new fileinputstream(xmlpath);
document = xmlparser.getinstance().getdomelement(fin);
// 删除blog下的message的0个节点
nodelist nl = document.getelementsbytagname("message");
node nodedel = (element) nl.item(0);
nodedel.getparentnode().removechild(nodedel);
xmlparser.getinstance().output(document, xmlpath);
} catch (exception e) {
}
}
@override
protected void ondestroy() {
super.ondestroy();
}
}
最后记得添加读写sdcard的权限！
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