xml和对象之间的互相转换以及json和对象之间的互相转换

首先先讲json和对象之间的互相转换，因为这个比较简单。

首先引入依赖

<groupId>com.alibaba</groupId>

<artifactId>fastjson</artifactId>

</dependency>

然后可以调用依赖里的方法

JSON.parseObject(str, ApprovalVo.class)是json字符串转化为java实体类; JSON.toJSONString(ApprovalVo)是把实体类转化成json字符串

str就是json字符串，ApprovalVo是实体类，如果这个实体类里面还包含了对象或者数组之类的也不用换方法，外面大的转了的话里面小的可以当作正常实体类取

接下来就是xml和对象之间的互相转换了

这是用jaxb来做的xml和对象互转，工具方法就是如下。除了用工具方法，还得在实体类上也做好注解，不然会报错

package com.hnykx.util;import cn.hutool.core.util.XmlUtil;import com.sun.xml.internal.bind.marshaller.CharacterEscapeHandler;import javax.xml.bind.JAXBContext;import javax.xml.bind.JAXBException;import javax.xml.bind.Marshaller;import javax.xml.bind.Unmarshaller;import java.io.IOException;import java.io.StringReader;import java.io.StringWriter;import java.io.Writer;public class XmlToObject extends XmlUtil {/*** xml字符串转为bean** @param xml xml字符串* @param clazz 需要转成的对象* @return*/@SuppressWarnings("unchecked")public static <T> T parseBean(String xml, Class<T> clazz) {try {JAXBContext context = JAXBContext.newInstance(clazz);Unmarshaller unmarshaller = context.createUnmarshaller();return (T) unmarshaller.unmarshal(new StringReader(xml));} catch (JAXBException e) {e.printStackTrace();return null;}}/*** 将对象转为xml字符串编码为utf-8 不格式化省略头部声明** @param obj 待转的对象* @return*/public static String toStr(Object obj) {return toStr(obj, false, true);}/*** 将对象转为xml字符串编码为utf-8** @param obj待转的对象* @param isFormat是否格式化* @param isIgnoreHead 是否忽略头部* @return*/public static String toStr(Object obj, boolean isFormat, boolean isIgnoreHead) {try {JAXBContext context = JAXBContext.newInstance(obj.getClass());Marshaller marshaller = context.createMarshaller();marshaller.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");// //编码格式marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, isFormat);// 是否格式化生成的xml串marshaller.setProperty(Marshaller.JAXB_FRAGMENT, isIgnoreHead);// 是否省略xm头声明信息// 不进行转义字符的处理marshaller.setProperty(CharacterEscapeHandler.class.getName(), new CharacterEscapeHandler() {@Overridepublic void escape(char[] ch, int start, int length, boolean isAttVal, Writer writer)throws IOException {writer.write(ch, start, length);}});StringWriter writer = new StringWriter();marshaller.marshal(obj, writer);return writer.toString();} catch (JAXBException e) {e.printStackTrace();return null;}}/*** 将对象转为xml字符串编码为utf-8 格式化省略头部声明** @param obj 待转的对象* @return*/public static String toPrettyStr(Object obj) {return toStr(obj, true, true);}/*** 将对象转为xml字符串编码为 GBK** @param obj待转的对象* @param isFormat是否格式化* @param isIgnoreHead 是否忽略头部* @return*/public static String toStrGF(Object obj, boolean isFormat, boolean isIgnoreHead) {try {JAXBContext context = JAXBContext.newInstance(obj.getClass());Marshaller marshaller = context.createMarshaller();marshaller.setProperty(Marshaller.JAXB_ENCODING, "GBK");// //编码格式marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, isFormat);// 是否格式化生成的xml串marshaller.setProperty(Marshaller.JAXB_FRAGMENT, isIgnoreHead);// 是否省略xm头声明信息// 不进行转义字符的处理marshaller.setProperty(CharacterEscapeHandler.class.getName(), new CharacterEscapeHandler() {@Overridepublic void escape(char[] ch, int start, int length, boolean isAttVal, Writer writer)throws IOException {writer.write(ch, start, length);}});StringWriter writer = new StringWriter();marshaller.marshal(obj, writer);return writer.toString();} catch (JAXBException e) {e.printStackTrace();return null;}}}

实体类的注解

@Data@XmlRootElement(name = "Response")@XmlAccessorType(XmlAccessType.FIELD)@XmlSeeAlso({AppAndDoadResBody.class})public class AppAndDoadResBase {@XmlElement(name="Head",required = true)private ResHeadVO Head;@XmlElement(name="Body",required = true)private AppAndDoadResBody Body;}

@XmlRootElement是用来标注外层是标签的，@XmlElement是用来标注外层标签里面的每个内容标签，注意，最好不要用泛型，因为jaxb有个小bug，绑定多个类的话会失效

@Data@XmlAccessorType(XmlAccessType.FIELD)public class ResHeadVO {private StringTxType;private StringTxTime;private StringCode;private StringMessage;}

如果是属性有复杂的带有list集合包对象的话，可以这样写注解

@Data@XmlRootElement(name="Body")@XmlAccessorType(XmlAccessType.FIELD)public class QueryResBody {@XmlElement(name = "CertList",required = true)private List<ItemModel> CertList;}

@Data@XmlRootElement(name="ItemModel")@XmlAccessorType(XmlAccessType.FIELD)public class ItemModel {private StringSubscriberName;}

下面是对象转xml和xml转对象的结果图

觉得还行的话点个赞叭，有问题的也可以评论，看到会回复的哦

顺便再推荐个好用的工具wangzhan，可以用xml和json示例报文直接解析快速生成实体类

json转javaBean实体类在线生成工具—工具猫