使用jaxb进行xml到bean的转换（尝试解决空值不显示问题）
import javax.xml.bind.Marshaller; import java.lang.reflect.Field; //监听生成xml文件过程 public class MarshallerListener extends Marshaller.Listener { public static final String BLANK_CHAR = ""; @Override public void beforeMarshal(Object source) { super.beforeMarshal(source); Field[] fields = source.getClass().getDeclaredFields(); for (Field f : fields) { f.setAccessible(true); try { System.out.println(f.getType() + f.getName()); if (f.getType() == String.class && f.get(source) == null) { f.set(source, BLANK_CHAR); }else if(!isBaseType(f)&& f.get(source) != null){ beforeMarshalClass(f.get(source)); } } catch (IllegalAccessException e) { e.printStackTrace(); } } } private void beforeMarshalClass(Object source) { // TODO Auto-generated method stub Field[] fields = source.getClass().getDeclaredFields(); for (Field f : fields) { f.setAccessible(true); try { if (f.getType() == String.class && f.get(source) == null) { f.set(source, BLANK_CHAR); }else if(!isBaseType(f) && f.get(source) != null){ System.out.println(f.getType()+f.getName()); beforeMarshalClass(f.get(source)); } } catch (IllegalAccessException e) { e.printStackTrace(); } } } /** * 判断object是否为基本类型 * @param object * @return */ public static boolean isBaseType(Field f) { System.out.println(f.getType()); System.out.println(String.class); System.out.println(f.getType() == String.class); if (f.getType() == Integer.class || f.getType() == Byte.class || f.getType() == Long.class || f.getType() == Double.class || f.getType() == String.class || f.getType() == Float.class || f.getType() == Character.class || f.getType() == Short.class || f.getType() == Boolean.class) { return true; } return false; } }
import java.io.IOException; import java.io.StringReader; import java.io.StringWriter; import javax.xml.bind.JAXBContext; import javax.xml.bind.JAXBException; import javax.xml.bind.Marshaller; import javax.xml.bind.Unmarshaller; public class JaxbUtil {//工具类 /** * java对象转换为xml文件 * @param xmlPath xml文件路径 * @param load java对象.Class * @return xml文件的String * @throws JAXBException */ public static String beanToXml(Object obj, Class<?> load) throws JAXBException { JAXBContext context = JAXBContext.newInstance(load); Marshaller marshaller = context.createMarshaller(); marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, false); marshaller.setProperty(Marshaller.JAXB_ENCODING, "UTF-8"); StringWriter writer = new StringWriter(); marshaller.marshal(obj, writer); return writer.toString(); } /** * xml文件配置转换为对象 * @param xmlPath xml文件路径 * @param load java对象.Class * @return java对象 * @throws JAXBException * @throws IOException */ @SuppressWarnings("unchecked") public static <T> T xmlToBean(String xmlPath, Class<T> load) throws JAXBException, IOException { JAXBContext context = JAXBContext.newInstance(load); Unmarshaller unmarshaller = context.createUnmarshaller(); return (T) unmarshaller.unmarshal(new StringReader(xmlPath)); } /** * JavaBean转换成xml * 默认编码UTF-8 * @param obj * @param writer * @return */ public static String convertToXml(Object obj) { return convertToXml(obj, "UTF-8"); } /** * JavaBean转换成xml * @param obj * @param encoding * @return */ public static String convertToXml(Object obj, String encoding) { String result = null; try { JAXBContext context = JAXBContext.newInstance(obj.getClass()); Marshaller marshaller = context.createMarshaller(); marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); marshaller.setProperty(Marshaller.JAXB_ENCODING, encoding); marshaller.setListener(new MarshallerListener()); StringWriter writer = new StringWriter(); marshaller.marshal(obj, writer); result = writer.toString(); } catch (Exception e) { e.printStackTrace(); } return result; } /** * JavaBean转换成xml去除xml声明部分 * @param obj * @param encoding * @return */ public static String convertToXmlIgnoreXmlHead(Object obj, String encoding) { String result = null; try { JAXBContext context = JAXBContext.newInstance(obj.getClass()); Marshaller marshaller = context.createMarshaller(); marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); marshaller.setProperty(Marshaller.JAXB_ENCODING, encoding); marshaller.setProperty(Marshaller.JAXB_FRAGMENT, true); StringWriter writer = new StringWriter(); marshaller.marshal(obj, writer); result = writer.toString(); } catch (Exception e) { e.printStackTrace(); } return result; } /** * xml转换成JavaBean * @param xml * @param c * @return */ @SuppressWarnings("unchecked") public static <T> T converyToJavaBean(String xml, Class<T> c) { T t = null; try { JAXBContext context = JAXBContext.newInstance(c); Unmarshaller unmarshaller = context.createUnmarshaller(); t = (T) unmarshaller.unmarshal(new StringReader(xml)); } catch (Exception e) { e.printStackTrace(); } return t; } }
生成xml的demo
import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.File; import java.io.FileInputStream; import java.io.FileWriter; import java.io.IOException; import java.io.InputStreamReader; import java.io.StringReader; import java.io.StringWriter; import org.dom4j.Document; import org.dom4j.DocumentException; import org.dom4j.DocumentHelper; import org.dom4j.Element; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class XmlUtil { private final static Logger logger = LoggerFactory.getLogger(MsBusUtil.class); public final static String msBus_xmlns = "http://MSBUSPlatform/v2.0"; /** * Add RequestHead to Request, Invoke, and remove ResponseHead from Response * * @param strRequestParam String * @param strSvcName String * @param strSvcMethod String * @return String * @throws GeneralException */ public static String invokeParam(String strRequestParam, String strSvcID, String keyword) throws DocumentException { Document doc = DocumentHelper.createDocument(); Element elmRoot = doc.addElement("ServiceInvoke", MsBusUtil.msBus_xmlns); Element elmHead = elmRoot.addElement("RequestHead"); elmHead.addElement("Requestid").addText(getRequestID(strSvcID)); elmHead.addElement("Requesttime").addText(DateUtil.getNowStr()); elmHead.addElement("Sourcesystemid").addText(""); elmRoot.addElement("Serviceid").addText(strSvcID); elmParam.addCDATA(strRequestParam); elmRoot.addElement("Keyword").addText(keyword); String strRequest = StringTranslator.toString(doc, "UTF-8"); logger.info("invoke Request:" + strRequest); return strRequest; } public static String getRequestID(String strSvcID) throws DocumentException { RandomGUID randomGUID = new RandomGUID(); return strSvcID + "-" + randomGUID.toString(); } public static void main(String[] args) throws Throwable { UnifiedContentDefineType ucd = new UnifiedContentDefineType(); ucd.setHead(new HeadType()); String param = JaxbUtil.convertToXml(ucd, "utf-8"); String req = invokeParam(param, "PLATFORM-UnifiedImport", "测试一下"); string2File(req,"F:\\归档.xml"); }; /** * 文本文件转换为指定编码的字符串 * * @param file 文本文件 * @param encoding 编码类型 * @return 转换后的字符串 * @throws IOException */ public static String file2String(File file, String encoding) { InputStreamReader reader = null; StringWriter writer = new StringWriter(); try { if (encoding == null || "".equals(encoding.trim())) { reader = new InputStreamReader(new FileInputStream(file), encoding); } else { reader = new InputStreamReader(new FileInputStream(file)); } // 将输入流写入输出流 char[] buffer = new char[1024]; int n = 0; while (-1 != (n = reader.read(buffer))) { writer.write(buffer, 0, n); } } catch (Exception e) { e.printStackTrace(); return null; } finally { if (reader != null) try { reader.close(); } catch (IOException e) { e.printStackTrace(); } } return writer.toString(); } /** * 将字符串写入指定文件(当指定的父路径中文件夹不存在时，会最大限度去创建，以保证保存成功！) * * @param res 原字符串 * @param filePath 文件路径 * @return 成功标记 */ public static boolean string2File(String res, String filePath) { boolean flag = true; BufferedReader bufferedReader = null; BufferedWriter bufferedWriter = null; try { File distFile = new File(filePath); if (!distFile.getParentFile().exists()) distFile.getParentFile().mkdirs(); bufferedReader = new BufferedReader(new StringReader(res)); bufferedWriter = new BufferedWriter(new FileWriter(distFile)); char buf[] = new char[1024]; //字符缓冲区 int len; while ((len = bufferedReader.read(buf)) != -1) { bufferedWriter.write(buf, 0, len); } bufferedWriter.flush(); bufferedReader.close(); bufferedWriter.close(); } catch (IOException e) { e.printStackTrace(); flag = false; return flag; } finally { if (bufferedReader != null) { try { bufferedReader.close(); } catch (IOException e) { e.printStackTrace(); } } } return flag; } }
