在平时经常遇到需要把xml文件转换为json格式数据的需求，这里将实现读取指定目录的xml文件并吧内容转换为json格式然后输出到指定目录。项目采用spring boot项目，下面是实现的主要步骤：

一，创建一个spring boot项目

1，创建好spring boot项目，配置pom.xml文件，代码如下：

<?xml version="1.0" encoding="UTF-8"?> <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 "> <modelVersion>4.0.0</modelVersion> <groupId>com.szkingdom</groupId> <artifactId>xmltojson</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>xmltojson</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.9.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.33</version> </dependency> <dependency> <groupId>org.json</groupId> <artifactId>json</artifactId> <version>20171018</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <finalName>xmltojson</finalName> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project> 上面主要引入一些依赖的jar包，比较简单，就不详细说明了。

2，配置application.

input.dir.filename=F:\mystudy\dd_address.xml output.dir.filename=F:\mystudy\jack.json encoding.format=gb2312

二，主要代码

package com.szkingdom; import org.json.XML; import org.springframework.beans.factory.annotation.Value; import org.springframework.boot.CommandLineRunner; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.w3c.dom.Document; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.transform.OutputKeys; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.StringWriter; import java.net.MalformedURLException; import java.net.URL; @SpringBootApplication public class XmltojsonApplication implements CommandLineRunner { //输入文件所在位置 @Value("${input.dir.filename}") private String inputFileName; //输出文件所在位置 @Value("${output.dir.filename}") private String outputFileName; //xml的编码格式 @Value("${encoding.format}") private String encodingFormat; public static void main(String[] args) { SpringApplication.run(XmltojsonApplication.class, args); } @Override public void run(String... strings) throws Exception { readXml(inputFileName); } public void readXml(String dir) throws MalformedURLException { File f = new File(dir); if (!f.exists()) { System.out.println("xml文件转换为json文件失败，读取的文件不存在......,请修读取文件配置"); return; } URL url = f.toURL(); System.out.println("读取文件的路径：url = " + url); String file = url.getFile(); DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); try { DocumentBuilder db = dbf.newDocumentBuilder(); Document doc = db.parse(file); String xml = toStringFromDoc(doc); //System.out.println(xml); xmlToJson(xml); } catch (Exception e) { e.printStackTrace(); } } /** * 把一个xml的document转换为xml字符串 * * @param document * @return */ public String toStringFromDoc(Document document) { String result = null; if (document != null) { StringWriter strWtr = new StringWriter(); StreamResult strResult = new StreamResult(strWtr); TransformerFactory tfac = TransformerFactory.newInstance(); try { javax.xml.transform.Transformer t = tfac.newTransformer(); //t.setOutputProperty(OutputKeys.ENCODING, "UTF-16"); //t.setOutputProperty(OutputKeys.ENCODING, "gb2312"); t.setOutputProperty(OutputKeys.ENCODING, encodingFormat); t.setOutputProperty(OutputKeys.INDENT, "yes"); t.setOutputProperty(OutputKeys.METHOD, "xml"); // xml, html, // text t.setOutputProperty("{}indent-amount", "4"); t.transform(new DOMSource(document.getDocumentElement()), strResult); } catch (Exception e) { System.err.println("XML.toString(Document): " + e); } result = strResult.getWriter().toString(); try { strWtr.close(); } catch (IOException e) { e.printStackTrace(); } } return result; } /** * xml字符串转json字符串 * * @param xml */ public void xmlToJson(String xml) { /* 第一种方法，使用JSON-JAVA提供的方法 */ //将xml转为json org.json.JSONObject xmlJSONObj = XML.toJSONObject(xml); //设置缩进 String jsonPrettyPrintString = xmlJSONObj.toString(4); //输出格式化后的json System.out.println(jsonPrettyPrintString); //JSONObject jsonObject = (JSONObject) JSONObject.parse(jsonPrettyPrintString); //System.out.println("jsonObject:"+jsonObject); //outJsonToFile(jsonObject); outJsonToFile(jsonPrettyPrintString); } /** * 输出json字符串到文件 * * @param jsonObject */ public void outJsonToFile(String jsonObject) { byte[] buff = new byte[]{}; //String jsonStr = jsonObject.toJSONString(); String jsonStr = jsonObject; FileOutputStream out = null; File file = new File(outputFileName); // 检测是否存在目录,不存在则创建目录 if (!file.getParentFile().exists()) { file.getParentFile().mkdirs(); } try { buff = jsonStr.getBytes(); //out=new FileOutputStream(outputFileName); out = new FileOutputStream(file); System.out.println("输出文件目录：" + outputFileName); out.write(buff, 0, buff.length); System.out.println("输出json数据到文件成功"); } catch (IOException e) { e.printStackTrace(); } finally { if (out != null) { try { out.close(); } catch (IOException e) { e.printStackTrace(); } } } } }

使用maven打包项目，使用如下的xmlToJson.bat脚本启动：