應用場景

lz最近在開發一個介面，需要接收xml型別的資料，然後對接收到的資料進行業務處理。
關於如何從請求中接收資料，CSDN上有很多文章。
再次只介紹下，我是如何把接收到的xml字串轉化為實體類的，大家有不同見解，歡迎給予建議。

準備以及實現

1.xml資料
批次（一個請求中可以存在多個批次）batch
批次編號batchCode
訂單（一個批次號中可以存在多個訂單）soOrder
訂單編碼orderCode
列印順序printOrder

<?xml version="1.0" encoding="utf-8"?>
 

<request>
<batchs>
<batch>
<batchCode>22</batchCode>
<soOrders>
<soOrder>
<orderCode>80000002866</orderCode>
<printOrder>10</printOrder>
</soOrder>
<soOrder>
<orderCode>08011801407</orderCode>
<printOrder>11</printOrder
 
>
</soOrder>
</soOrders>
</batch>
<batch>
<batchCode>33</batchCode>
<soOrders>
<soOrder>
<orderCode>08011801435</orderCode>
<printOrder>10</printOrder>
</soOrder>
<soOrder>
<orderCode>08011801445</orderCode>
<printOrder
 
>11</printOrder>
</soOrder>
</soOrders>
</batch>
</batchs>
</request>

2.序列化與反序列化工具類XmlUtils

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;

/**
 * Copyright (c) 2017. ****** All Rights Reserved.
 * 
 * @描述: TODO
 * @作者: lizy
 * @建立: 2018-2-7 下午3:56:49
 * @版本: V1.0 *
 */
public class XmlUtils {
    /**
     * 將物件直接轉換成String型別的 XML輸出
     * 
     * @param obj
     * @return
     */
    public static String convertToXml(Object obj) {
        // 建立輸出流
        StringWriter sw = new StringWriter();
        try {
            // 利用jdk中自帶的轉換類實現
            JAXBContext context = JAXBContext.newInstance(obj.getClass());

            Marshaller marshaller = context.createMarshaller();
            // 格式化xml輸出的格式
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT,
                    Boolean.TRUE);
            // 將物件轉換成輸出流形式的xml
            marshaller.marshal(obj, sw);
        } catch (JAXBException e) {
            e.printStackTrace();
        }
        return sw.toString();
    }

    /**
     * 將String型別的xml轉換成物件
     */
    public static Object convertXmlStrToObject(Class clazz, String xmlStr) {
        Object xmlObject = null;
        try {
            JAXBContext context = JAXBContext.newInstance(clazz);
            // 進行將Xml轉成物件的核心介面
            Unmarshaller unmarshaller = context.createUnmarshaller();
            StringReader sr = new StringReader(xmlStr);
            xmlObject = unmarshaller.unmarshal(sr);
        } catch (JAXBException e) {
            e.printStackTrace();
        }
        return xmlObject;
    }
}

3.相關實體類
請求類ThermOrderPrintRequest

import java.io.Serializable;
import java.util.List;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;

/**
 * Copyright (c) 2017. ****** All Rights Reserved.
 * 
 * @描述: 
 * @作者: lizy
 * @建立: 2018-2-7 下午4:24:51
 * @版本: V1.0 *
 */
@XmlRootElement(name = "request")
@XmlAccessorType(XmlAccessType.FIELD)
public class ThermOrderPrintRequest implements Serializable{

    @XmlElementWrapper(name = "batchs")
    @XmlElement(name = "batch")
    private List<ThermOrderPrintBatch> batchs;

    public List<ThermOrderPrintBatch> getBatchs() {
        return batchs;
    }

    public void setBatchs(List<ThermOrderPrintBatch> batchs) {
        this.batchs = batchs;
    }

}

請求批次類ThermOrderPrintBatch

import java.io.Serializable;
import java.util.List;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlList;
import javax.xml.bind.annotation.XmlRootElement;

/**
 * Copyright (c) 2017. ***** All Rights Reserved.
 * 
 * @描述: TODO
 * @作者: lizy
 * @建立: 2018-2-7 下午4:17:10
 * @版本: V1.0 *
 */
@XmlAccessorType(XmlAccessType.FIELD)
public class ThermOrderPrintBatch implements Serializable{

    @XmlElement(name = "batchCode")
    private String batchCode;// 批次編號

    @XmlElementWrapper(name = "soOrders")
    @XmlElement(name = "soOrder")
    private List<ThermOrderPrint> orderPrints;

    public String getBatchCode() {
        return batchCode;
    }

    public void setBatchCode(String batchCode) {
        this.batchCode = batchCode;
    }

    public List<ThermOrderPrint> getOrderPrints() {
        return orderPrints;
    }

    public void setOrderPrints(List<ThermOrderPrint> orderPrints) {
        this.orderPrints = orderPrints;
    }

}

訂單類ThermOrderPrint

import java.io.Serializable;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

/**
 * Copyright (c) 2017. ****** All Rights Reserved.
 * 
 * @描述: 
 * @作者: lizy
 * @建立: 2018-2-7 下午4:00:53
 * @版本: V1.0 *
 */
@XmlAccessorType(XmlAccessType.FIELD)
public class ThermOrderPrint implements Serializable{

    @XmlElement(name = "orderCode")
    private String orderCode;// 訂單編碼

    @XmlElement(name = "printOrder")
    private String printOrder;// 列印順序

    public String getOrderCode() {
        return orderCode;
    }
    public void setOrderCode(String orderCode) {
        this.orderCode = orderCode;
    }
    public String getPrintOrder() {
        return printOrder;
    }
    public void setPrintOrder(String printOrder) {
        this.printOrder = printOrder;
    }

}

4.反序列化為ThermOrderPrintRequest

ThermOrderPrintRequest orderPrintRequest = (ThermOrderPrintRequest) XmlUtils
                            .convertXmlStrToObject(
                                    ThermOrderPrintRequest.class,XmlString);

注意事項

1. xml內容不能有轉義字元，否則在反序列化會報錯；
2. @XmlRootElement在請求類加註釋，表示為根節點；
3. @XmlAccessorType用了這個之後就會自動忽略setter/getter方法。不用這個就需要去掉註解，需要保證屬性名和xml裡的表簽名一致；
4. @XmlElement(name = "batch")表明節點，name需要和節點名一致；
5. @XmlElementWrapper(name = "batchs")表示生成一個包裝 XML 表示形式的包裝器元素。 此元素主要用於生成一個包裝集合的包裝器 XML 元素；