轉自:[CXF REST標準實戰系列] 一、JAXB xml與javaBean的轉換

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文章Points:

1、不認識到犯錯，然后得到永久的教訓。

2、認識JAXB

3、代碼實戰

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1、不認識到犯錯，然后得到永久的教訓。

? 也不是所謂的教訓吧，真正的教訓來自于對錯誤的剖析理解很深刻。然后有種“吃一塹，長一智”的感覺才叫教訓。近日和團隊工頭們用CXF3.0和Spring4.0開發一個平臺，模仿著第三方支付，用xml進行數據交互。

? 因此，搜了下。果斷用了dom4j，用自己鍵盤papa打了個叫做XmlOjbUtil的工具類。后來百度下，雖然不是萬能的百度。但也要表揚下，發現人家搭著REST的CXF卻集成了Jaxb。

? 果斷拋棄了！（有時候決定就需要這么果斷。）

先做個鋪墊，我們先說下一些知識點：

? CXF實現webService項目，有兩種模式可以開發。Jax-ws實現經典的Web Service和Jax-rs實現REST標準。在Java EE 5/6中，Jaxb可以方便地集成，負責xml與JavaBean的映射。其實Jaxb也可以作為xml解析的一種技術。

2、認識JAXB

? JAXB（Java Architecture for XML Binding)是根據XML Schema映射到JavaBean的技術。過程中，JAXB將XML實例文檔反向生成Java對象樹的方法，并能將Java對象樹的內容重新寫到 XML實例文檔。

? 在JDK1.6時，JAXB 2.0是JDK 1.6的組成部分。JAXB 2.2.3是JDK 1.7的組成部分。

提前修一下文檔知識吧：

? JDK中JAXB相關的重要CLASS和INTERFACE：

? 1、JAXBContext類，是應用的入口，用于管理XML/Java綁定信息。

? 2、Marshaller接口，將Java對象序列化為XML數據。

? 3、Unmarshaller接口，將XML數據反序列化為Java對象。

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? JDK中JAXB相關的重要ANNOTATION：

??1、@XmlType，將Java類或枚舉類型映射到XML模式類型

??2、@XmlAccessorType(XmlAccessType.FIELD) ，控制字段或屬性的序列化。FIELD表示JAXB將自動綁定Java類中的每個非靜態的（static）、非瞬態的（由@XmlTransient標注）字段到XML。其他值還有XmlAccessType.PROPERTY和XmlAccessType.NONE。

??3、@XmlAccessorOrder，控制JAXB 綁定類中屬性和字段的排序。

??4、@XmlJavaTypeAdapter，使用定制的適配器（即擴展抽象類XmlAdapter并覆蓋marshal()和unmarshal()方法），以序列化Java類為XML。

??5、@XmlElementWrapper?，對于數組或集合（即包含多個元素的成員變量），生成一個包裝該數組或集合的XML元素（稱為包裝器）。

??6、@XmlRootElement，將Java類或枚舉類型映射到XML元素。

??7、@XmlElement，將Java類的一個屬性映射到與屬性同名的一個XML元素。

??8、@XmlAttribute，將Java類的一個屬性映射到與屬性同名的一個XML屬性。

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3、代碼實戰

我們既然要設計報文，所以我這邊拿出來一個注冊的Bean的設計。首先我們設計注冊的Bean，代碼如下：

DataBean.java

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package com.xidian.wq.imaopay.model.mesdata.base; import javax.xml.bind.annotation.XmlRootElement; /** ?* ?* @author BYSocket ?* 報文頭-[報文基礎信息] ?*/ @XmlRootElement(name="data_bean") public class DataBean { ????// 版本信息(data_version) ????String version; ????? ????消息類型(data_type) ????// 000001 - 注冊[個人信息Post|Respose] ????// 000002 - 綁定銀行卡[首次綁定，保存個人信息] ????// 000003 - 綁定銀行卡[二次，校驗個人信息] ????// 100001 - 支付[錢包支付] ????// 100002 - 查詢 ????// 200001 ????String data_type; ????? ????訂單編號(order_id) ????// 總長20位, 有字母要用大寫 ????String batch_no; ????? ????// 平臺賬號(platform_account) ????String user_name; ????? ????請求狀態 ????// 000 ????String trans_state; ????? ????// 簽名信息(msg_sign) ????String msg_sign; ????// 時間戳(randomTime) ????private String rd_time; ????// 隨機數(randomNum) ????private String rd_num; ????// 密鑰(keySign) ????private String k_sign; ????? ????// 保留域 ????String reserve; ????public String getVersion() ????{ ????????return version; ????} ????public void setVersion(String version) ????{ ????????this.version = version; ????} ????public String getData_type() ????{ ????????return data_type; ????} ????public void setData_type(String data_type) ????{ ????????this.data_type = data_type; ????} ????public String getBatch_no() ????{ ????????return batch_no; ????} ????public void setBatch_no(String batch_no) ????{ ????????this.batch_no = batch_no; ????} ????public String getUser_name() ????{ ????????return user_name; ????} ????public void setUser_name(String user_name) ????{ ????????this.user_name = user_name; ????} ????public String getTrans_state() ????{ ????????return trans_state; ????} ????public void setTrans_state(String trans_state) ????{ ????????this.trans_state = trans_state; ????} ????public String getMsg_sign() ????{ ????????return msg_sign; ????} ????public void setMsg_sign(String msg_sign) ????{ ????????this.msg_sign = msg_sign; ????} ????public String getRd_time() ????{ ????????return rd_time; ????} ????public void setRd_time(String rd_time) ????{ ????????this.rd_time = rd_time; ????} ????public String getRd_num() ????{ ????????return rd_num; ????} ????public void setRd_num(String rd_num) ????{ ????????this.rd_num = rd_num; ????} ????public String getK_sign() ????{ ????????return k_sign; ????} ????public void setK_sign(String k_sign) ????{ ????????this.k_sign = k_sign; ????} ????public String getReserve() ????{ ????????return reserve; ????} ????public void setReserve(String reserve) ????{ ????????this.reserve = reserve; ????} }

RegBean.java

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package com.xidian.wq.imaopay.model.mesdata.base; import javax.xml.bind.annotation.XmlRootElement; /** ?* ?* @author BYSocket ?* 報文體-[用戶注冊報文體信息] ?*/ @XmlRootElement(name="reg_bean") public class RegBean { ????? ????// 注冊報文體流水號(reg_data_sn) ????private String reg_sn; ????? ????用戶編號(user_info_id) ????// 業務系統的用戶編號只做記錄不在支付系統中邏輯處理 ????private Integer user_id; ????// 注冊賬號(reg_account) ????private String reg_no; ????? ????// 注冊途徑(reg_way) ????private String reg_way; ????? ????// 保留域 ????private String reserve; ????? ????提交日期(set_time) ????// 業務系統上傳 ????private String set_time; ????? ????// 后臺信息返回路徑(return_url) ????private String ret_url; ????? ????// 備注 ????String remarks; ????public String getReg_sn() ????{ ????????return reg_sn; ????} ????public void setReg_sn(String reg_sn) ????{ ????????this.reg_sn = reg_sn; ????} ????public Integer getUser_id() ????{ ????????return user_id; ????} ????public void setUser_id(Integer user_id) ????{ ????????this.user_id = user_id; ????} ????public String getReg_no() ????{ ????????return reg_no; ????} ????public void setReg_no(String reg_no) ????{ ????????this.reg_no = reg_no; ????} ????public String getReg_way() ????{ ????????return reg_way; ????} ????public void setReg_way(String reg_way) ????{ ????????this.reg_way = reg_way; ????} ????public String getReserve() ????{ ????????return reserve; ????} ????public void setReserve(String reserve) ????{ ????????this.reserve = reserve; ????} ????public String getSet_time() ????{ ????????return set_time; ????} ????public void setSet_time(String set_time) ????{ ????????this.set_time = set_time; ????} ????public String getRet_url() ????{ ????????return ret_url; ????} ????public void setRet_url(String ret_url) ????{ ????????this.ret_url = ret_url; ????} ????public String getRemarks() ????{ ????????return remarks; ????} ????public void setRemarks(String remarks) ????{ ????????this.remarks = remarks; ????} }

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注冊報文體MsgRegBean.java，支持內容的列表。

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package com.xidian.wq.imaopay.model.mesdata; import java.util.List; import javax.xml.bind.annotation.XmlElement; import javax.xml.bind.annotation.XmlElementWrapper; import javax.xml.bind.annotation.XmlRootElement; import com.xidian.wq.imaopay.model.mesdata.base.DataBean; import com.xidian.wq.imaopay.model.mesdata.base.RegBean; @XmlRootElement( name = "msg_bean" ) public class MsgRegBean { ????private DataBean dataBean; ????? ????private List<RegBean> regBeans; ????? ????public DataBean getDataBean() ????{ ????????return dataBean; ????} ????@XmlElement(name = "data_bean") ????public void setDataBean(DataBean dataBean) ????{ ????????this.dataBean = dataBean; ????} ????@XmlElementWrapper(name = "reg_beans")? ????@XmlElement(name = "reg_bean") ????public List<RegBean> getRegBeans() ????{ ????????return regBeans; ????} ????public void setRegBeans(List<RegBean> regBeans) ????{ ????????this.regBeans = regBeans; ????} }

然后針對的我們用Jaxb實現一個轉換的Util類：

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package com.xidian.wq.imaopay.util; import java.io.StringReader;? import java.io.StringWriter; import java.util.ArrayList; import java.util.List; import javax.xml.bind.JAXBContext;? import javax.xml.bind.JAXBException;? import javax.xml.bind.Marshaller;? import javax.xml.bind.Unmarshaller;? import com.alibaba.fastjson.JSON; import com.xidian.wq.imaopay.model.mesdata.MsgRegBean; import com.xidian.wq.imaopay.model.mesdata.base.DataBean; import com.xidian.wq.imaopay.model.mesdata.base.RegBean; /** ?*?? ?* @author BYSocket ?* Jaxb2.0 處理Xml與Object轉換 ?* ?*/ public class JaxbObjectAndXmlUtil {? ??????? ????/** ?????* @param xmlStr 字符串 ?????* @param c 對象Class類型 ?????* @return 對象實例 ?????*/ ????@SuppressWarnings("unchecked") ????public static <T> T xml2Object(String xmlStr,Class<T> c) ????{? ????????try ????????{? ????????????JAXBContext context = JAXBContext.newInstance(c);? ????????????Unmarshaller unmarshaller = context.createUnmarshaller();? ????????????? ????????????T t = (T) unmarshaller.unmarshal(new StringReader(xmlStr));? ????????????? ????????????return t;? ????????????? ????????} catch (JAXBException e) {? e.printStackTrace();? return null; }? ????????? ????}? ??????? ????/** ?????* @param object 對象 ?????* @return 返回xmlStr ?????*/ ????public static String object2Xml(Object object) ????{? ????????try ????????{??? ????????????StringWriter writer = new StringWriter(); ????????????JAXBContext context = JAXBContext.newInstance(object.getClass());? ????????????Marshaller? marshal = context.createMarshaller(); ????????????? ????????????marshal.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); // 格式化輸出? ????????????marshal.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");// 編碼格式,默認為utf-8? ????????????marshal.setProperty(Marshaller.JAXB_FRAGMENT, false);// 是否省略xml頭信息? ????????????marshal.setProperty("jaxb.encoding", "utf-8");? ????????????marshal.marshal(object,writer); ????????????? ????????????return new String(writer.getBuffer()); ????????????? ????????} catch (Exception e) { e.printStackTrace(); return null;}???? ????????? ????}? ????? ????public static void main(String[] args) ????{ ?????????/** 構造測試報文頭對象 */ ????????DataBean dataBean = new DataBean(); ????????dataBean.setBatch_no("N20150204"); ????????dataBean.setData_type("000001"); ????????dataBean.setVersion("v1.0"); ????????dataBean.setUser_name("xx"); ????????dataBean.setMsg_sign("未知"); ????????dataBean.setRd_num("6631383"); ????????dataBean.setRd_time("20150204"); ????????dataBean.setK_sign("75CC479AAC09F00BA28F0E968B1BC9D1B90ADCC2"); ????????/** 構造測試報文體對象 */ ????????RegBean regBean = new RegBean(); ????????regBean.setReg_sn("REG20150204"); ????????regBean.setUser_id(12); ????????regBean.setReg_no("33"); ????????regBean.setReg_way("pc"); ????????regBean.setSet_time("20150204 16:18"); ????????regBean.setRet_url("未知"); ????????regBean.setRemarks("無備注"); ????????? ????????MsgRegBean msgBean = new MsgRegBean(); ????????List<RegBean> regBeans = new ArrayList<RegBean>(); ????????regBeans.add(regBean); ????????regBeans.add(regBean); ????????? ????????msgBean.setRegBeans(regBeans); ????????msgBean.setDataBean(dataBean); ????????? ????????String xmlStr = JaxbObjectAndXmlUtil.object2Xml(msgBean);//構造報文 XML 格式的字符串 ????????System.out.println("對象轉xml報文： \n"+xmlStr); ????????? ????????MsgRegBean msgBean2 = JaxbObjectAndXmlUtil.xml2Object(xmlStr, MsgRegBean.class); ????????System.out.println("報文轉xml轉： \n"+JSON.toJSONString(msgBean2)); ????} }

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運行下測試main函數，可以得到如下的輸出：

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對象轉xml報文： <?xml version="1.0" encoding="utf-8" standalone="yes"?> <msg_bean> ????<data_bean> ????????<batch_no>N20150204</batch_no> ????????<data_type>000001</data_type> ????????<k_sign>75CC479AAC09F00BA28F0E968B1BC9D1B90ADCC2</k_sign> ????????<msg_sign>未知</msg_sign> ????????<rd_num>6631383</rd_num> ????????<rd_time>20150204</rd_time> ????????<user_name>xx</user_name> ????????<version>v1.0</version> ????</data_bean> ????<reg_beans> ????????<reg_bean> ????????????<reg_no>33</reg_no> ????????????<reg_sn>REG20150204</reg_sn> ????????????<reg_way>pc</reg_way> ????????????<remarks>無備注</remarks> ????????????<ret_url>未知</ret_url> ????????????<set_time>20150204 16:18</set_time> ????????????<user_id>12</user_id> ????????</reg_bean> ????????<reg_bean> ????????????<reg_no>33</reg_no> ????????????<reg_sn>REG20150204</reg_sn> ????????????<reg_way>pc</reg_way> ????????????<remarks>無備注</remarks> ????????????<ret_url>未知</ret_url> ????????????<set_time>20150204 16:18</set_time> ????????????<user_id>12</user_id> ????????</reg_bean> ????</reg_beans> </msg_bean> 報文轉xml轉： {"dataBean":{"batch_no":"N20150204","data_type":"000001","k_sign":"75CC479AAC09F00BA28F0E968B1BC9D1B90ADCC2","msg_sign":"未知","rd_num":"6631383","rd_time":"20150204","user_name":"xx","version":"v1.0"},"regBeans":[{"reg_no":"33","reg_sn":"REG20150204","reg_way":"pc","remarks":"無備注","ret_url":"未知","set_time":"20150204 16:18","user_id":12},{"reg_no":"33","reg_sn":"REG20150204","reg_way":"pc","remarks":"無備注","ret_url":"未知","set_time":"20150204 16:18","user_id":12}]}

代碼中間注意點：
? Marshaller.JAXB_FORMATTED_OUTPUT ：決定是否在轉換成xml時同時進行格式化（即按標簽自動換行，否則即是一行的xml）?。

? Marshaller.JAXB_ENCODING ：xml的編碼方式。

? Marshaller.JAXB_FRAGMENT ：是否省略xml頭信息

? marshal.setProperty("jaxb.encoding", "utf-8"); ： 設置編碼格式 utf-8

總結

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