自定义类库:Java转换xml文件转化pojo工具

一、之前java读取xml配置文件时，总是通过dom4j第三方库主动解析，最近发现可以通过jdk类库将xml转换pojo。

二、编写xml转化工具类XmlUtils

package com.moy.demo.common.utils;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;
import java.io.InputStream;
import java.io.Reader;
import java.io.StringReader;

/**
 * [Project]:cloud-demo-master  <br/>
 * [Email]:moy25@foxmail.com  <br/>
 * [Date]:2018/4/30  <br/>
 * [Description]:  <br/>
 *
 * @author YeXiangYang
 */
public abstract class XmlUtils {

    public static <T> T xmlFileToObject(String xmlFilePath, Class<T> clazz) {
        ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
        try (InputStream inputStream = contextClassLoader.getResourceAsStream(xmlFilePath)) {
            JAXBContext context = JAXBContext.newInstance(clazz);
            Unmarshaller unmarshaller = context.createUnmarshaller();
            T result = (T) unmarshaller.unmarshal(inputStream);
            return result;
        } catch (Exception e) {
            throw new RuntimeException("convert xml to POJO failure!", e);
        }
    }

    public static <T> T xmlStringToObject(String xmlString, Class<T> clazz) {
        try (Reader reader = new StringReader(xmlString)) {
            JAXBContext context = JAXBContext.newInstance(clazz);
            Unmarshaller unmarshaller = context.createUnmarshaller();
            T result = (T) unmarshaller.unmarshal(reader);
            return result;
        } catch (Exception e) {
            throw new RuntimeException("convert xml string to POJO failure!", e);
        }
    }
}

二、测试

　　a、第一步：定义一个xml配置文件如：cityList.xml

<?xml version="1.0" encoding="UTF-8" ?>
<c c1="0">
    <d d1="101020100" d2="上海" d3="shanghai" d4="上海"/>
    <d d1="101220101" d2="合肥" d3="hefei" d4="安徽"/>
    <d d1="101190101" d2="南京" d3="jiangshu" d4="江苏"/>
    <d d1="101010100" d2="北京" d3="beijing" d4="北京"/>
    <d d1="101270101" d2="成都" d3="chengdu" d4="四川"/>
</c>

View Code