XMLKit.java

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import java.io.*;

/**
 * 基于JAXB规范的XML解析器。
 * 使用此工具需要针对DOM结构生成带有JAXB注解的实体，可以使用工具生成(trang.jar)，见以下描述：
 *
 * 1. 准备XML文件，为其生成XSD文档
 * （java -jar trang.jar test.xml test.xsd）
 *
 * 2. 使用生成的xsd文件构建JavaBean文件
 * （xjc test.xsd -d E:/xmlbean -p com.fastjee.model.xml）
 *  (xjc xsd文件 -d 实体保存路径 -p 包名)
 */
public class XMLTranslator {

    private XMLTranslator() {}

    /**
     * 将符合jaxb规范的JavaBean转换为xml字符串
     *
     * @param obj
     * @param format 格式化输出
     * @return XML字符串
     */
    public static String pojo2xml(Object obj, boolean format) {
        required(obj);

        try (Writer writer = new StringWriter()) {
            JAXBContext context = JAXBContext.newInstance(obj.getClass());
            Marshaller marshaller = context.createMarshaller();
            if (format) {
                // 格式化xml输出的格式
                marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
            }
            // 将对象转换成输出流形式的xml
            marshaller.marshal(obj, writer);

            return writer.toString().replace("standalone=\"yes\"", "");
        } catch (Exception e) {
            throw new RuntimeException("pojo2xml:转换失败," + e.getMessage());
        }
    }


    /**
     * @see #pojo2xml(Object, boolean)
     */
    public static String pojo2xml(Object obj) {
        return pojo2xml(obj, true);
    }


    /**
     * 将符合jaxb规范的JavaBean转换为xml文件
     *
     * @param obj
     * @param filePath 文件全路径
     * @param format   格式化
     * @return XML文件对象
     */
    public static File pojo2file(Object obj, String filePath, boolean format) {
        required(obj, filePath);

        File file = new File(filePath);
        if (!file.exists()) {
            try {
                file.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        try (Writer writer = new FileWriter(file)) {
            writer.write(pojo2xml(obj, format));
            writer.flush();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return file;
    }

    /**
     * @see #pojo2file(Object, String, boolean)
     */
    public static File pojo2file(Object obj, String filePath) {
        return pojo2file(obj, filePath, true);
    }

    /**
     * XML文件转JavaBean
     */
    public static 
 
   T file2pojo(Class
  
    clazz, File file) { return toPojo(clazz,file); } /** * XML字符串转JavaBean */ public static 
   
     T xml2pojo(Class
    
      clazz, String xml) { return toPojo(clazz, xml); } private static 
     
       T toPojo(Class
      
        clazz, Object obj) { required(clazz,obj); try (Reader reader = (obj instanceof String) ? new StringReader((String) obj) : new FileReader((File) obj)) { JAXBContext context = JAXBContext.newInstance(clazz); Unmarshaller unmarshaller = context.createUnmarshaller(); return (T) unmarshaller.unmarshal(reader); } catch (Exception e) { throw new RuntimeException("toPojo:转换失败," + e.getMessage()); } } private static void required(Object... obj) { for (int i = 0; i < obj.length; i++) { if (null == obj[i]) throw new IllegalArgumentException("参数[" + i + "]不能为空。"); } } }