【XML配置文件读取】使用jdom读取XML配置文件信息
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内容图文
在项目中我们经常需要将配置信息写在配置文件中，而XML配置文件是常用的格式。
下面将介绍如何通过jdom来读取xml配置文件信息。
配置文件信息
-
<?
xml version
=
"1.0"
encoding
=
"UTF-8"
?>
-
<config>
-
<base-config>
-
<stringValue>
Hello world
</stringValue>
-
<integerValue>
8
</integerValue>
-
<longValue>
32768
</longValue>
-
</base-config>
-
-
<books>
-
<book
id
=
"111"
>
-
<name>
Java 编程
</name>
-
<price>
33
</price>
-
</book>
-
<book
id
=
"222"
>
-
<name>
Spring学习指南
</name>
-
<price>
55
</price>
-
</book>
-
</books>
-
-
<computers>
-
<computer
type
=
"dell"
size
=
"14寸"
/>
-
<computer
type
=
"thinkpad"
size
=
"16寸"
/>
-
<computer
type
=
"apple"
size
=
"22寸"
/>
-
</computers>
-
</config>
需要的Jar包（MAVEN给出）
完整的POM文件
-
<
project xmlns
=
"http://maven.apache.org/POM/4.0.0"
xmlns
:
xsi
=
"http://www.w3.org/2001/XMLSchema-instance"
-
xsi
:
schemaLocation
=
"http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
>
-
<
modelVersion
>
4.0
.
0
</
modelVersion
>
-
-
<
groupId
>
com
.
ll
</
groupId
>
-
<
artifactId
>
myThreadStudy
</
artifactId
>
-
<
version
>
0.0
.
1
-
SNAPSHOT
</
version
>
-
<
packaging
>
jar
</
packaging
>
-
-
<
name
>
myThreadStudy
</
name
>
-
<
url
>
http
:
//maven.apache.org</url>
-
-
<
properties
>
-
<
project
.
build
.
sourceEncoding
>
UTF
-
8
</
project
.
build
.
sourceEncoding
>
-
<
junitVersion
>
3.8
.
1
</
junitVersion
>
-
<
commons
-
io
-
Version
>
2.4
</
commons
-
io
-
Version
>
-
<
jaxenVersion
>
1.1
.
1
</
jaxenVersion
>
-
<
jdomVersion
>
1.1
</
jdomVersion
>
-
<
log4jVersion
>
1.2
.
17
</
log4jVersion
>
-
</
properties
>
-
-
<
dependencies
>
-
<
dependency
>
-
<
groupId
>
junit
</
groupId
>
-
<
artifactId
>
junit
</
artifactId
>
-
<
version
>
$
{
junitVersion
}</
version
>
-
<
scope
>
test
</
scope
>
-
</
dependency
>
-
-
<
dependency
>
-
<
groupId
>
commons
-
io
</
groupId
>
-
<
artifactId
>
commons
-
io
</
artifactId
>
-
<
version
>
$
{
commons
-
io
-
Version
}</
version
>
-
</
dependency
>
-
<
dependency
>
-
<
groupId
>
org
.
jdom
</
groupId
>
-
<
artifactId
>
jdom
</
artifactId
>
-
<
version
>
$
{
jdomVersion
}</
version
>
-
</
dependency
>
-
<
dependency
>
-
<
groupId
>
log4j
</
groupId
>
-
<
artifactId
>
log4j
</
artifactId
>
-
<
version
>
$
{
log4jVersion
}</
version
>
-
</
dependency
>
-
<
dependency
>
-
<
groupId
>
jaxen
</
groupId
>
-
<
artifactId
>
jaxen
</
artifactId
>
-
<
version
>
$
{
jaxenVersion
}</
version
>
-
</
dependency
>
-
</
dependencies
>
-
-
<
build
>
-
<
defaultGoal
>
install
</
defaultGoal
>
-
-
<
plugins
>
-
<
plugin
>
-
<
groupId
>
org
.
apache
.
maven
.
plugins
</
groupId
>
-
<
artifactId
>
maven
-
compiler
-
plugin
</
artifactId
>
-
<
version
>
2.5
.
1
</
version
>
-
<
configuration
>
-
<
source
>
1.7
</
source
>
-
<
target
>
1.7
</
target
>
-
<
encoding
>
UTF
-
8
</
encoding
>
<!--
“编码
GBK
的不可映射字符”问题的解决
-->
-
</
configuration
>
-
</
plugin
>
-
</
plugins
>
-
</
build
>
-
-
</
project
>
通用的XML操作类（XMLOperatorUtils.java）
-
package
com
.
ll
.
myThreadStudy
.
MyThread
;
-
-
import
java
.
util
.
List
;
-
-
import
org
.
jdom
.
Element
;
-
import
org
.
jdom
.
JDOMException
;
-
import
org
.
jdom
.
xpath
.
XPath
;
-
-
public
class
XMLOperatorUtils
{
-
-
public
static
String
getElementAttributeStringValue
(
Element
element
,
-
String
AttributeName
)
{
-
try
{
-
return
element
.
getAttributeValue
(
AttributeName
);
-
}
catch
(
Exception
e
)
{
-
return
null
;
-
}
-
}
-
-
public
static
Integer
getElementAttributeIntegerValue
(
Element
element
,
-
String
AttributeName
)
{
-
try
{
-
return
Integer
.
parseInt
(
getElementAttributeStringValue
(
element
,
-
AttributeName
));
-
}
catch
(
Exception
e
)
{
-
return
-
1
;
-
}
-
}
-
-
public
static
Long
getElementAttributeLongValue
(
Element
element
,
-
String
AttributeName
)
{
-
try
{
-
return
Long
.
parseLong
(
getElementAttributeStringValue
(
element
,
-
AttributeName
));
-
}
catch
(
Exception
e
)
{
-
return
-
1l
;
-
}
-
}
-
-
public
static
Boolean
getElementAttributeBooleanValue
(
Element
element
,
-
String
AttributeName
)
{
-
try
{
-
return
Boolean
.
parseBoolean
(
getElementAttributeStringValue
(
element
,
-
AttributeName
));
-
}
catch
(
Exception
e
)
{
-
return
false
;
-
}
-
}
-
-
public
static
String
getElementTextStringValueFromRoot
(
Element
rootEle
,
-
String
path
)
{
-
try
{
-
return
((
Element
)
getSingleNode
(
rootEle
,
path
)).
getTextTrim
();
-
}
catch
(
Exception
e
)
{
-
return
null
;
-
}
-
}
-
-
public
static
Integer
getElementTextIntegerValueFromRoot
(
Element
rootEle
,
-
String
path
)
{
-
try
{
-
return
Integer
.
parseInt
(
getElementTextStringValueFromRoot
(
rootEle
,
-
path
));
-
}
catch
(
Exception
e
)
{
-
return
-
1
;
-
}
-
}
-
-
public
static
Long
getElementTextLongValueFromRoot
(
Element
rootEle
,
-
String
path
)
{
-
try
{
-
return
Long
.
parseLong
(
getElementTextStringValueFromRoot
(
rootEle
,
-
path
));
-
}
catch
(
Exception
e
)
{
-
return
-
1l
;
-
}
-
}
-
-
public
static
Boolean
getElementTextBooleanValueFromRoot
(
Element
rootEle
,
-
String
path
)
{
-
try
{
-
return
Boolean
.
parseBoolean
(
getElementTextStringValueFromRoot
(
-
rootEle
,
path
));
-
}
catch
(
Exception
e
)
{
-
return
false
;
-
}
-
}
-
-
public
static
String
getElementTextStringValueByElement
(
Element
element
,
-
String
childName
)
{
-
try
{
-
return
element
.
getChildText
(
childName
);
-
}
catch
(
Exception
e
)
{
-
return
null
;
-
}
-
}
-
-
protected
static
Integer
getElementTextIntegerValueByElement
(
-
Element
element
,
String
childName
)
{
-
try
{
-
return
Integer
.
parseInt
(
getElementTextStringValueByElement
(
element
,
-
childName
));
-
}
catch
(
Exception
e
)
{
-
return
-
1
;
-
}
-
}
-
-
protected
static
Long
getElementTextLongValueByElement
(
Element
element
,
-
String
childName
)
{
-
try
{
-
return
Long
.
parseLong
(
getElementTextStringValueByElement
(
element
,
-
childName
));
-
}
catch
(
Exception
e
)
{
-
return
-
1l
;
-
}
-
}
-
-
protected
static
Boolean
getElementTextBooleanValueByElement
(
-
Element
element
,
String
childName
)
{
-
try
{
-
return
Boolean
.
parseBoolean
(
getElementTextStringValueByElement
(
-
element
,
childName
));
-
}
catch
(
Exception
e
)
{
-
return
false
;
-
}
-
}
-
-
protected
static
Object
getSingleNode
(
Element
rootEle
,
String
path
)
-
throws
JDOMException
{
-
return
XPath
.
selectSingleNode
(
rootEle
,
path
);
-
}
-
-
@SuppressWarnings
(
"rawtypes"
)
-
protected
static
List
getNodes
(
Element
rootEle
,
String
path
)
-
throws
JDOMException
{
-
return
XPath
.
selectNodes
(
rootEle
,
path
);
-
}
-
}
读取配置文件到Java POJO
-
package
com
.
ll
.
myThreadStudy
.
MyThread
;
-
-
import
java
.
io
.
File
;
-
import
java
.
util
.
ArrayList
;
-
import
java
.
util
.
HashMap
;
-
import
java
.
util
.
List
;
-
-
import
org
.
apache
.
log4j
.
Logger
;
-
import
org
.
jdom
.
Element
;
-
import
org
.
jdom
.
input
.
SAXBuilder
;
-
import
org
.
jdom
.
xpath
.
XPath
;
-
-
public
class
XmlToConfigVO
{
-
private
static
Logger
logger
=
Logger
.
getLogger
(
XmlToConfigVO
.
class
);
-
-
public
static
MyConfigVo
getLogSystemConfigVO
(
String
fileName
)
{
-
try
{
-
Element
rootEle
=
new
SAXBuilder
().
build
(
new
File
(
fileName
))
-
.
getRootElement
();
-
MyConfigVo
myConfigVo
=
new
MyConfigVo
();
-
-
//获取单个节点值的内容
-
myConfigVo
.
setStringValue
(
XMLOperatorUtils
-
.
getElementTextStringValueFromRoot
(
rootEle
,
-
"/config/base-config/stringValue"
));
-
myConfigVo
.
setIntegerValue
(
XMLOperatorUtils
-
.
getElementTextIntegerValueFromRoot
(
rootEle
,
-
"/config/base-config/integerValue"
));
-
myConfigVo
.
setLongValue
(
XMLOperatorUtils
-
.
getElementTextLongValueFromRoot
(
rootEle
,
-
"/config/base-config/longValue"
));
-
-
//获取多个节点值
-
HashMap
<
Integer
,
BookVo
>
booksMap
=
new
HashMap
<
Integer
,
BookVo
>();
-
for
(
Object
element
:
XPath
.
selectNodes
(
rootEle
,
"/config/books/book"
))
{
-
BookVo
book
=
new
BookVo
();
-
book
.
setId
(
XMLOperatorUtils
.
getElementAttributeIntegerValue
((
Element
)
element
,
"id"
));
-
book
.
setName
(
XMLOperatorUtils
.
getElementTextStringValueByElement
((
Element
)
element
,
"name"
));
-
book
.
setPrice
(
XMLOperatorUtils
.
getElementTextLongValueByElement
((
Element
)
element
,
"price"
));
-
booksMap
.
put
(
book
.
getId
(),
book
);
-
}
-
myConfigVo
.
setBooksMap
(
booksMap
);
-
-
List
<
ComputerVo
>
computerList
=
new
ArrayList
<
ComputerVo
>();
-
for
(
Object
element
:
XPath
.
selectNodes
(
rootEle
,
"/config/computers/computer"
))
{
-
ComputerVo
computer
=
new
ComputerVo
();
-
computer
.
setType
(
XMLOperatorUtils
.
getElementAttributeStringValue
((
Element
)
element
,
"type"
));
-
computer
.
setSize
(
XMLOperatorUtils
.
getElementAttributeStringValue
((
Element
)
element
,
"size"
));
-
computerList
.
add
(
computer
);
-
}
-
myConfigVo
.
setComputerList
(
computerList
);
-
return
myConfigVo
;
-
}
catch
(
Exception
e
)
{
-
logger
.
error
(
e
);
-
}
-
return
null
;
-
}
-
-
}
完整程序
-
package
com
.
ll
.
myThreadStudy
.
MyThread
;
-
-
import
java
.
util
.
ArrayList
;
-
import
java
.
util
.
HashMap
;
-
import
java
.
util
.
List
;
-
-
public
class
MyConfigVo
{
-
private
String
stringValue
;
-
private
Integer
integerValue
;
-
private
Long
longValue
;
-
private
HashMap
<
Integer
,
BookVo
>
booksMap
=
new
HashMap
<
Integer
,
BookVo
>();
-
private
List
<
ComputerVo
>
computerList
=
new
ArrayList
<
ComputerVo
>();
-
-
public
String
getStringValue
()
{
-
return
stringValue
;
-
}
-
-
public
void
setStringValue
(
String
stringValue
)
{
-
this
.
stringValue
=
stringValue
;
-
}
-
-
public
Integer
getIntegerValue
()
{
-
return
integerValue
;
-
}
-
-
public
void
setIntegerValue
(
Integer
integerValue
)
{
-
this
.
integerValue
=
integerValue
;
-
}
-
-
public
Long
getLongValue
()
{
-
return
longValue
;
-
}
-
-
public
void
setLongValue
(
Long
longValue
)
{
-
this
.
longValue
=
longValue
;
-
}
-
-
public
HashMap
<
Integer
,
BookVo
>
getBooksMap
()
{
-
return
booksMap
;
-
}
-
-
public
void
setBooksMap
(
HashMap
<
Integer
,
BookVo
>
booksMap
)
{
-
this
.
booksMap
=
booksMap
;
-
}
-
-
public
List
<
ComputerVo
>
getComputerList
()
{
-
return
computerList
;
-
}
-
-
public
void
setComputerList
(
List
<
ComputerVo
>
computerList
)
{
-
this
.
computerList
=
computerList
;
-
}
-
-
@Override
-
public
int
hashCode
()
{
-
final
int
prime
=
31
;
-
int
result
=
1
;
-
result
=
prime
*
result
-
+
((
booksMap
==
null
)
?
0
:
booksMap
.
hashCode
());
-
result
=
prime
*
result
-
+
((
computerList
==
null
)
?
0
:
computerList
.
hashCode
());
-
result
=
prime
*
result
-
+
((
integerValue
==
null
)
?
0
:
integerValue
.
hashCode
());
-
result
=
prime
*
result
-
+
((
longValue
==
null
)
?
0
:
longValue
.
hashCode
());
-
result
=
prime
*
result
-
+
((
stringValue
==
null
)
?
0
:
stringValue
.
hashCode
());
-
return
result
;
-
}
-
-
@Override
-
public
String
toString
()
{
-
return
"MyConfigVo [stringValue="
+
stringValue
+
", integerValue="
-
+
integerValue
+
", longValue="
+
longValue
+
", booksMap="
-
+
booksMap
+
", computerList="
+
computerList
+
"]"
;
-
}
-
-
@Override
-
public
boolean
equals
(
Object
obj
)
{
-
if
(
this
==
obj
)
-
return
true
;
-
if
(
obj
==
null
)
-
return
false
;
-
if
(
getClass
()
!=
obj
.
getClass
())
-
return
false
;
-
MyConfigVo
other
=
(
MyConfigVo
)
obj
;
-
if
(
booksMap
==
null
)
{
-
if
(
other
.
booksMap
!=
null
)
-
return
false
;
-
}
else
if
(!
booksMap
.
equals
(
other
.
booksMap
))
-
return
false
;
-
if
(
computerList
==
null
)
{
-
if
(
other
.
computerList
!=
null
)
-
return
false
;
-
}
else
if
(!
computerList
.
equals
(
other
.
computerList
))
-
return
false
;
-
if
(
integerValue
==
null
)
{
-
if
(
other
.
integerValue
!=
null
)
-
return
false
;
-
}
else
if
(!
integerValue
.
equals
(
other
.
integerValue
))
-
return
false
;
-
if
(
longValue
==
null
)
{
-
if
(
other
.
longValue
!=
null
)
-
return
false
;
-
}
else
if
(!
longValue
.
equals
(
other
.
longValue
))
-
return
false
;
-
if
(
stringValue
==
null
)
{
-
if
(
other
.
stringValue
!=
null
)
-
return
false
;
-
}
else
if
(!
stringValue
.
equals
(
other
.
stringValue
))
-
return
false
;
-
return
true
;
-
}
-
-
}
-
package
com
.
ll
.
myThreadStudy
.
MyThread
;
-
-
public
class
ComputerVo
{
-
private
String
type
;
-
private
String
size
;
-
-
public
String
getType
()
{
-
return
type
;
-
}
-
-
public
void
setType
(
String
type
)
{
-
this
.
type
=
type
;
-
}
-
-
public
String
getSize
()
{
-
return
size
;
-
}
-
-
public
void
setSize
(
String
size
)
{
-
this
.
size
=
size
;
-
}
-
-
@Override
-
public
String
toString
()
{
-
return
"ComputerVo [type="
+
type
+
", size="
+
size
+
"]"
;
-
}
-
-
}
-
package
com
.
ll
.
myThreadStudy
.
MyThread
;
-
-
public
class
BookVo
{
-
private
Integer
id
;
-
private
String
name
;
-
private
Long
price
;
-
-
public
Integer
getId
()
{
-
return
id
;
-
}
-
-
public
void
setId
(
Integer
id
)
{
-
this
.
id
=
id
;
-
}
-
-
public
String
getName
()
{
-
return
name
;
-
}
-
-
public
void
setName
(
String
name
)
{
-
this
.
name
=
name
;
-
}
-
-
public
Long
getPrice
()
{
-
return
price
;
-
}
-
-
public
void
setPrice
(
Long
price
)
{
-
this
.
price
=
price
;
-
}
-
-
@Override
-
public
String
toString
()
{
-
return
"BookVo [, name="
+
name
+
", price="
+
price
+
"]"
;
-
}
-
-
}
测试文件
-
package
com
.
ll
.
myThreadStudy
.
MyThread
;
-
-
public
class
Main
{
-
public
static
void
main
(
String
args
[])
{
-
MyConfigVo
myConfigVo
=
XmlToConfigVO
.
getLogSystemConfigVO
(
"d:\\myConfig.xml"
);
-
System
.
out
.
println
(
myConfigVo
);
-
}
-
-
}
测试结果
附件列表
原文：http://www.cnblogs.com/ssslinppp/p/4954451.html
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