• 【XML配置文件读取】使用jdom读取XML配置文件信息

    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


    1. <?xml version="1.0" encoding="UTF-8"?>
    2. <config>
    3.     <base-config>
    4. 	     <stringValue>Hello world</stringValue>
    5. 		 <integerValue>8</integerValue>
    6. 		 <longValue>32768</longValue>
    7. 	</base-config>
    8. 	
    9. 	<books>
    10.         <book id="111"> 
    11.             <name>Java 编程</name>
    12. 			<price>33</price>            
    13.         </book>
    14.         <book id="222">
    15.             <name>Spring学习指南</name>
    16.             <price>55</price>
    17.         </book>
    18.     </books>
    19.       
    20.     <computers>
    21.         <computer type="dell" size="14寸" />
    22.         <computer type="thinkpad" size="16寸" />
    23.         <computer type="apple" size="22寸" />
    24.     </computers>
    25. </config>

    需要的Jar包（MAVEN给出）


    完整的POM文件

    1. <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    2. 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    3. 	<modelVersion>4.0.0</modelVersion>
    5. 	<groupId>com.ll</groupId>
    6. 	<artifactId>myThreadStudy</artifactId>
    7. 	<version>0.0.1-SNAPSHOT</version>
    8. 	<packaging>jar</packaging>
    10. 	<name>myThreadStudy</name>
    11. 	<url>http://maven.apache.org</url>
    13. 	<properties>
    14. 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    15. 		<junitVersion>3.8.1</junitVersion>
    16. 		<commons-io-Version>2.4</commons-io-Version>
    17. 		<jaxenVersion>1.1.1</jaxenVersion>
    18. 		<jdomVersion>1.1</jdomVersion>
    19. 		<log4jVersion>1.2.17</log4jVersion>
    20. 	</properties>
    22. 	<dependencies>
    23. 		<dependency>
    24. 			<groupId>junit</groupId>
    25. 			<artifactId>junit</artifactId>
    26. 			<version>${junitVersion}</version>
    27. 			<scope>test</scope>
    28. 		</dependency>
    30. 		<dependency>
    31. 			<groupId>commons-io</groupId>
    32. 			<artifactId>commons-io</artifactId>
    33. 			<version>${commons-io-Version}</version>
    34. 		</dependency>
    35. 		<dependency>
    36. 			<groupId>org.jdom</groupId>
    37. 			<artifactId>jdom</artifactId>
    38. 			<version>${jdomVersion}</version>
    39. 		</dependency>
    40. 		<dependency>
    41. 			<groupId>log4j</groupId>
    42. 			<artifactId>log4j</artifactId>
    43. 			<version>${log4jVersion}</version>
    44. 		</dependency>
    45. 		<dependency>
    46.             <groupId>jaxen</groupId>
    47.             <artifactId>jaxen</artifactId>
    48.             <version>${jaxenVersion}</version>
    49.         </dependency>
    50. 	</dependencies>
    52. 	<build>
    53. 		<defaultGoal>install</defaultGoal>
    55. 		<plugins>
    56. 			<plugin>
    57. 				<groupId>org.apache.maven.plugins</groupId>
    58. 				<artifactId>maven-compiler-plugin</artifactId>
    59. 				<version>2.5.1</version>
    60. 				<configuration>
    61. 					<source>1.7</source>
    62. 					<target>1.7</target>
    63. 					<encoding>UTF-8</encoding>  <!-- “编码 GBK 的不可映射字符”问题的解决 -->
    64. 				</configuration>
    65. 			</plugin>
    66. 		</plugins>
    67. 	</build>
    69. </project>

    通用的XML操作类（XMLOperatorUtils.java）

    1. package com.ll.myThreadStudy.MyThread;
    3. import java.util.List;
    5. import org.jdom.Element;
    6. import org.jdom.JDOMException;
    7. import org.jdom.xpath.XPath;
    9. public class XMLOperatorUtils {
    11. 	public static String getElementAttributeStringValue(Element element,
    12. 			String AttributeName) {
    13. 		try {
    14. 			return element.getAttributeValue(AttributeName);
    15. 		} catch (Exception e) {
    16. 			return null;
    17. 		}
    18. 	}
    20. 	public static Integer getElementAttributeIntegerValue(Element element,
    21. 			String AttributeName) {
    22. 		try {
    23. 			return Integer.parseInt(getElementAttributeStringValue(element,
    24. 					AttributeName));
    25. 		} catch (Exception e) {
    26. 			return -1;
    27. 		}
    28. 	}
    30. 	public static Long getElementAttributeLongValue(Element element,
    31. 			String AttributeName) {
    32. 		try {
    33. 			return Long.parseLong(getElementAttributeStringValue(element,
    34. 					AttributeName));
    35. 		} catch (Exception e) {
    36. 			return -1l;
    37. 		}
    38. 	}
    40. 	public static Boolean getElementAttributeBooleanValue(Element element,
    41. 			String AttributeName) {
    42. 		try {
    43. 			return Boolean.parseBoolean(getElementAttributeStringValue(element,
    44. 					AttributeName));
    45. 		} catch (Exception e) {
    46. 			return false;
    47. 		}
    48. 	}
    50. 	public static String getElementTextStringValueFromRoot(Element rootEle,
    51. 			String path) {
    52. 		try {
    53. 			return ((Element) getSingleNode(rootEle, path)).getTextTrim();
    54. 		} catch (Exception e) {
    55. 			return null;
    56. 		}
    57. 	}
    59. 	public static Integer getElementTextIntegerValueFromRoot(Element rootEle,
    60. 			String path) {
    61. 		try {
    62. 			return Integer.parseInt(getElementTextStringValueFromRoot(rootEle,
    63. 					path));
    64. 		} catch (Exception e) {
    65. 			return -1;
    66. 		}
    67. 	}
    69. 	public static Long getElementTextLongValueFromRoot(Element rootEle,
    70. 			String path) {
    71. 		try {
    72. 			return Long.parseLong(getElementTextStringValueFromRoot(rootEle,
    73. 					path));
    74. 		} catch (Exception e) {
    75. 			return -1l;
    76. 		}
    77. 	}
    79. 	public static Boolean getElementTextBooleanValueFromRoot(Element rootEle,
    80. 			String path) {
    81. 		try {
    82. 			return Boolean.parseBoolean(getElementTextStringValueFromRoot(
    83. 					rootEle, path));
    84. 		} catch (Exception e) {
    85. 			return false;
    86. 		}
    87. 	}
    89. 	public static String getElementTextStringValueByElement(Element element,
    90. 			String childName) {
    91. 		try {
    92. 			return element.getChildText(childName);
    93. 		} catch (Exception e) {
    94. 			return null;
    95. 		}
    96. 	}
    98. 	protected static Integer getElementTextIntegerValueByElement(
    99. 			Element element, String childName) {
    100. 		try {
    101. 			return Integer.parseInt(getElementTextStringValueByElement(element,
    102. 					childName));
    103. 		} catch (Exception e) {
    104. 			return -1;
    105. 		}
    106. 	}
    108. 	protected static Long getElementTextLongValueByElement(Element element,
    109. 			String childName) {
    110. 		try {
    111. 			return Long.parseLong(getElementTextStringValueByElement(element,
    112. 					childName));
    113. 		} catch (Exception e) {
    114. 			return -1l;
    115. 		}
    116. 	}
    118. 	protected static Boolean getElementTextBooleanValueByElement(
    119. 			Element element, String childName) {
    120. 		try {
    121. 			return Boolean.parseBoolean(getElementTextStringValueByElement(
    122. 					element, childName));
    123. 		} catch (Exception e) {
    124. 			return false;
    125. 		}
    126. 	}
    128. 	protected static Object getSingleNode(Element rootEle, String path)
    129. 			throws JDOMException {
    130. 		return XPath.selectSingleNode(rootEle, path);
    131. 	}
    133. 	@SuppressWarnings("rawtypes")
    134. 	protected static List getNodes(Element rootEle, String path)
    135. 			throws JDOMException {
    136. 		return XPath.selectNodes(rootEle, path);
    137. 	}
    138. }

    读取配置文件到Java POJO

    1. package com.ll.myThreadStudy.MyThread;
    3. import java.io.File;
    4. import java.util.ArrayList;
    5. import java.util.HashMap;
    6. import java.util.List;
    8. import org.apache.log4j.Logger;
    9. import org.jdom.Element;
    10. import org.jdom.input.SAXBuilder;
    11. import org.jdom.xpath.XPath;
    13. public class XmlToConfigVO {
    14.     private static Logger logger = Logger.getLogger(XmlToConfigVO.class);
    16.     public static MyConfigVo getLogSystemConfigVO(String fileName) {
    17.         try {
    18.             Element rootEle = new SAXBuilder().build(new File(fileName))
    19.                     .getRootElement();
    20.             MyConfigVo myConfigVo = new MyConfigVo();
    21.             
    22.             //获取单个节点值的内容
    23.             myConfigVo.setStringValue(XMLOperatorUtils
    24.                     .getElementTextStringValueFromRoot(rootEle,
    25.                             "/config/base-config/stringValue"));
    26.             myConfigVo.setIntegerValue(XMLOperatorUtils
    27.                     .getElementTextIntegerValueFromRoot(rootEle,
    28.                             "/config/base-config/integerValue"));
    29.             myConfigVo.setLongValue(XMLOperatorUtils
    30.                     .getElementTextLongValueFromRoot(rootEle,
    31.                             "/config/base-config/longValue"));
    32.             
    33.             //获取多个节点值
    34.             HashMap<Integer, BookVo> booksMap = new HashMap<Integer, BookVo>();
    35.             for (Object element : XPath.selectNodes(rootEle,"/config/books/book")) {
    36.             	BookVo book = new BookVo();
    37.             	book.setId(XMLOperatorUtils.getElementAttributeIntegerValue((Element) element,"id"));
    38.             	book.setName(XMLOperatorUtils.getElementTextStringValueByElement((Element) element,"name"));
    39.             	book.setPrice(XMLOperatorUtils.getElementTextLongValueByElement((Element) element,"price"));
    40.             	booksMap.put(book.getId(),book);
    41.             }
    42.             myConfigVo.setBooksMap(booksMap);
    43.             
    44.             List<ComputerVo> computerList= new ArrayList<ComputerVo>();
    45.             for (Object element : XPath.selectNodes(rootEle,"/config/computers/computer")) {
    46.             	ComputerVo computer = new ComputerVo();
    47.             	computer.setType(XMLOperatorUtils.getElementAttributeStringValue((Element) element, "type"));
    48.             	computer.setSize(XMLOperatorUtils.getElementAttributeStringValue((Element) element,"size"));
    49.             	computerList.add(computer);
    50.             }
    51.             myConfigVo.setComputerList(computerList);
    52.             return myConfigVo;
    53.         } catch (Exception e) {
    54.             logger.error(e);
    55.         }
    56.         return null;
    57.     }
    59. }

    完整程序


    1. package com.ll.myThreadStudy.MyThread;
    3. import java.util.ArrayList;
    4. import java.util.HashMap;
    5. import java.util.List;
    7. public class MyConfigVo {
    8. 	private String stringValue;
    9. 	private Integer integerValue;
    10. 	private Long longValue;
    11. 	private HashMap<Integer, BookVo> booksMap = new HashMap<Integer, BookVo>();
    12. 	private List<ComputerVo> computerList = new ArrayList<ComputerVo>();
    14. 	public String getStringValue() {
    15. 		return stringValue;
    16. 	}
    18. 	public void setStringValue(String stringValue) {
    19. 		this.stringValue = stringValue;
    20. 	}
    22. 	public Integer getIntegerValue() {
    23. 		return integerValue;
    24. 	}
    26. 	public void setIntegerValue(Integer integerValue) {
    27. 		this.integerValue = integerValue;
    28. 	}
    30. 	public Long getLongValue() {
    31. 		return longValue;
    32. 	}
    34. 	public void setLongValue(Long longValue) {
    35. 		this.longValue = longValue;
    36. 	}
    38. 	public HashMap<Integer, BookVo> getBooksMap() {
    39. 		return booksMap;
    40. 	}
    42. 	public void setBooksMap(HashMap<Integer, BookVo> booksMap) {
    43. 		this.booksMap = booksMap;
    44. 	}
    46. 	public List<ComputerVo> getComputerList() {
    47. 		return computerList;
    48. 	}
    50. 	public void setComputerList(List<ComputerVo> computerList) {
    51. 		this.computerList = computerList;
    52. 	}
    54. 	@Override
    55. 	public int hashCode() {
    56. 		final int prime = 31;
    57. 		int result = 1;
    58. 		result = prime * result
    59. 				+ ((booksMap == null) ? 0 : booksMap.hashCode());
    60. 		result = prime * result
    61. 				+ ((computerList == null) ? 0 : computerList.hashCode());
    62. 		result = prime * result
    63. 				+ ((integerValue == null) ? 0 : integerValue.hashCode());
    64. 		result = prime * result
    65. 				+ ((longValue == null) ? 0 : longValue.hashCode());
    66. 		result = prime * result
    67. 				+ ((stringValue == null) ? 0 : stringValue.hashCode());
    68. 		return result;
    69. 	}
    71. 	@Override
    72. 	public String toString() {
    73. 		return "MyConfigVo [stringValue=" + stringValue + ", integerValue="
    74. 				+ integerValue + ", longValue=" + longValue + ", booksMap="
    75. 				+ booksMap + ", computerList=" + computerList + "]";
    76. 	}
    78. 	@Override
    79. 	public boolean equals(Object obj) {
    80. 		if (this == obj)
    81. 			return true;
    82. 		if (obj == null)
    83. 			return false;
    84. 		if (getClass() != obj.getClass())
    85. 			return false;
    86. 		MyConfigVo other = (MyConfigVo) obj;
    87. 		if (booksMap == null) {
    88. 			if (other.booksMap != null)
    89. 				return false;
    90. 		} else if (!booksMap.equals(other.booksMap))
    91. 			return false;
    92. 		if (computerList == null) {
    93. 			if (other.computerList != null)
    94. 				return false;
    95. 		} else if (!computerList.equals(other.computerList))
    96. 			return false;
    97. 		if (integerValue == null) {
    98. 			if (other.integerValue != null)
    99. 				return false;
    100. 		} else if (!integerValue.equals(other.integerValue))
    101. 			return false;
    102. 		if (longValue == null) {
    103. 			if (other.longValue != null)
    104. 				return false;
    105. 		} else if (!longValue.equals(other.longValue))
    106. 			return false;
    107. 		if (stringValue == null) {
    108. 			if (other.stringValue != null)
    109. 				return false;
    110. 		} else if (!stringValue.equals(other.stringValue))
    111. 			return false;
    112. 		return true;
    113. 	}
    115. }
    1. package com.ll.myThreadStudy.MyThread;
    3. public class ComputerVo {
    4. 	private String type;
    5. 	private String size;
    7. 	public String getType() {
    8. 		return type;
    9. 	}
    11. 	public void setType(String type) {
    12. 		this.type = type;
    13. 	}
    15. 	public String getSize() {
    16. 		return size;
    17. 	}
    19. 	public void setSize(String size) {
    20. 		this.size = size;
    21. 	}
    23. 	@Override
    24. 	public String toString() {
    25. 		return "ComputerVo [type=" + type + ", size=" + size + "]";
    26. 	}
    28. }
    1. package com.ll.myThreadStudy.MyThread;
    3. public class BookVo {
    4. 	private Integer id;
    5. 	private String name;
    6. 	private Long price;
    8. 	public Integer getId() {
    9. 		return id;
    10. 	}
    12. 	public void setId(Integer id) {
    13. 		this.id = id;
    14. 	}
    16. 	public String getName() {
    17. 		return name;
    18. 	}
    20. 	public void setName(String name) {
    21. 		this.name = name;
    22. 	}
    24. 	public Long getPrice() {
    25. 		return price;
    26. 	}
    28. 	public void setPrice(Long price) {
    29. 		this.price = price;
    30. 	}
    32. 	@Override
    33. 	public String toString() {
    34. 		return "BookVo [id=" + id + ", name=" + name + ", price=" + price + "]";
    35. 	}
    37. }

    测试文件

    1. package com.ll.myThreadStudy.MyThread;
    3. public class Main {
    4. 	public static void main(String args[]) {
    5. 		MyConfigVo myConfigVo = XmlToConfigVO.getLogSystemConfigVO("d:\myConfig.xml");
    6. 		System.out.println(myConfigVo);
    7. 	}
    9. }

    测试结果









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    • 原文地址：https://www.cnblogs.com/ssslinppp/p/4954451.html
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