xstream运用，JAVA对象转xml，xml转JAVA对象

目录

xstream

优点：

缺点：

XStream的应用场景

用到的依赖

代码实现

xml标签对应的实体类

Header

Package

Request

Response

TradeInfo

工具类

XmlUtils

执行结果

---

xstream

XStream是一个Java类库，主要用于将对象序列化为XML（或JSON）或将XML（或JSON）反序列化为对象。XStream使用Java反射机制对要进行序列化的对象树的结构进行探索，无需对对象进行修改。它可以序列化内部字段，包括私有（private）和最终（final）字段，并支持非公开类以及内部类。在缺省情况下，XStream不需要配置映射关系，对象和字段将映射为同名XML元素。

优点：

1. 易用性：XStream不需要额外的辅助类或映射文件，使得XML序列化不再繁琐。
2. 灵活性：支持多种数据类型转换，包括用户自定义的类型转换器。
3. 可读性：输出通常比其他工具更清晰和易于阅读。

缺点：

1. 效率：相对于某些工具（如XMLEncoder），XStream在处理大型数据集时可能会较慢，因为它需要在每个对象实例上运行解析器。
2. 内存使用：XStream使用流操作可能导致较高的内存使用，特别是在处理大型数据集时。

XStream的应用场景

XStream的常见用途包括对象传输、持久化、配置以及单元测试等。它在许多项目中，特别是在支付API对接时，被用于实现Java对象和XML文档的互转。

用到的依赖

<!--XML解析-->
        <dependency>
            <groupId>com.thoughtworks.xstream</groupId>
            <artifactId>xstream</artifactId>
            <version>1.4.20</version>
        </dependency>

        <dependency>
            <groupId>dom4j</groupId>
            <artifactId>dom4j</artifactId>
            <version>1.6.1</version>
        </dependency>

代码实现

<!--xml报文-->
<?xml version='1.0' encoding='UTF-8'?>
<Package>
    <Header>
        <RequestType>131</RequestType>
        <SystemNo>001</SystemNo>
        <SendTime>2024-06-05 09:53:38</SendTime>
        <Status>100</Status>
        <ErrorMessage />
    </Header>
    <Sign>NgJzJyhoeXYd/TJvJitByhUR1UVMJ+FjuMl4WVBjP0CsOM6owyX9nCn1c/IL+OpVeSYkl4k60Du8nLa13wRB1oqFA8I2zel9+Xiq7lAL0otIcdww4F9i5uULk2wpq8ApXcghO5suL54FPOutc+2gWNUUmdP6fb2/L2RFKOlcBig=</Sign>
    <Response>
        <DepartmentCode>5</DepartmentCode>
        <TransSourceCode>0</TransSourceCode>
        <PayNo />
        <PayAmount>100</PayAmount>
        <RealPayAmount>100</RealPayAmount>
        <PaymentTime>2024-06-05 09:50:49</PaymentTime>
        <DealTime>2024-06-05 09:50:49</DealTime>
        <PayType>1</PayType>
        <PlatformCode>35</PlatformCode>
        <PlatformName />
        <OrderId>1000000001678451</OrderId>
        <OrderStatus>2</OrderStatus>
        <PageUrl>https://blog.csdn.net/weixin_59383491?type=blog</PageUrl>
        <NotifyUrl>https://blog.csdn.net/weixin_59383491?type=blog</NotifyUrl>
        <AutoErrMsg />
        <BusinessTypeDetail />
        <BusinessType />
        <TradeList>
            <TradeIfo>
                <ProductId />
                <ApplyPolicyNo />
                <PersonnelName />
                <PlanCode />
                <ProductName>一百减一是零</ProductName>
                <BatchDetailNo>1010000202400000065</BatchDetailNo>
                <ProductType>7</ProductType>
                <BatchPolicyNo />
                <TradeDetailNo />
                <TradeAmt>100</TradeAmt>
                <OriginCode />
                <OriginTradeNo />
            </TradeIfo>
        </TradeList>
    </Response>
</Package>

xml标签对应的实体类

Header

package com.yun.greedy.modules.util.xstream;

import com.thoughtworks.xstream.annotations.XStreamAlias;
import lombok.Data;

@XStreamAlias("Header")
@Data
public class Header {
    @XStreamAlias("RequestType")
    private String requestType;

    @XStreamAlias("SystemNo")
    private String systemNo;

    @XStreamAlias("SendTime")
    private String sendTime;

    @XStreamAlias("Status")
    private String status;

    @XStreamAlias("ErrorMessage")
    private String errorMessage;
}

Package

package com.yun.greedy.modules.util.xstream;

import com.thoughtworks.xstream.annotations.XStreamAlias;
import lombok.Data;

@XStreamAlias("Package")
@Data
public class Package {
    @XStreamAlias("Header")
    private Header head;

    @XStreamAlias("Sign")
    private String sign;

    @XStreamAlias("Request")
    private Request request;

    @XStreamAlias("Response")
    private Response response;
}

Request

package com.yun.greedy.modules.util.xstream;

import com.thoughtworks.xstream.annotations.XStreamAlias;
import lombok.Data;

import java.util.List;

@Data
@XStreamAlias("Request")
public class Request {
    @XStreamAlias("DepartmentCode")
    private String departmentCode;

    @XStreamAlias("TransSourceCode")
    private String transSourceCode;

    @XStreamAlias("PayType")
    private String payType;

    @XStreamAlias("PlatformCode")
    private String platformCode;

    @XStreamAlias("BankType")
    private String bankType;

    @XStreamAlias("PayAmount")
    private String payAmount;

    @XStreamAlias("PageUrl")
    private String pageUrl;

    @XStreamAlias("NotifyUrl")
    private String notifyUrl;

    @XStreamAlias("TradeNo")
    private String tradeNo;

    @XStreamAlias("TradeList")
    private List<TradeInfo> tradeList;
}

Response

package com.yun.greedy.modules.util.xstream;

import com.thoughtworks.xstream.annotations.XStreamAlias;
import lombok.Data;

import java.util.List;

@Data
@XStreamAlias("Response")
public class Response {
    @XStreamAlias("DepartmentCode")
    private String departmentCode;

    @XStreamAlias("TransSourceCode")
    private String transSourceCode;

    @XStreamAlias("PayAmount")
    private String payAmount;

    @XStreamAlias("RealPayAmount")
    private String realPayAmount;

    @XStreamAlias("PaymentTime")
    private String paymentTime;

    @XStreamAlias("PayType")
    private String payType;

    @XStreamAlias("PlatformCode")
    private String platformCode;

    @XStreamAlias("PlatformName")
    private String platformName;

    @XStreamAlias("TradeNo")
    private String tradeNo;

    @XStreamAlias("OrderId")
    private String orderId;

    @XStreamAlias("OrderStatus")
    private String orderStatus;

    @XStreamAlias("PageUrl")
    private String pageUrl;

    @XStreamAlias("NotifyUrl")
    private String notifyUrl;

    @XStreamAlias("AutoErrMsg")
    private String autoErrMsg;

    @XStreamAlias("DealTime")
    private String dealTime;

    @XStreamAlias("PayNo")
    private String payNo;

    @XStreamAlias("BusinessTypeDetail")
    private String businessTypeDetail;

    @XStreamAlias("BusinessType")
    private String businessType;

    @XStreamAlias("TradeList")
    private List<TradeInfo> tradeList;
}

TradeInfo

package com.yun.greedy.modules.util.xstream;

import com.thoughtworks.xstream.annotations.XStreamAlias;
import lombok.Data;

@Data
@XStreamAlias("TradeIfo")
public class TradeInfo {
    @XStreamAlias("ProductId")
    private String productId;

    @XStreamAlias("ApplyPolicyNo")
    private String applyPolicyNo;

    @XStreamAlias("PlanCode")
    private String planCode;

    @XStreamAlias("BatchPolicyNo")
    private String batchPolicyNo;

    @XStreamAlias("BatchDetailNo")
    private String batchDetailNo;

    @XStreamAlias("TradeDetailNo")
    private String tradeDetailNo;

    @XStreamAlias("PersonnelName")
    private String personnelName;

    @XStreamAlias("CertificateNo")
    private String certificateNo;

    @XStreamAlias("MobileTelephone")
    private String mobileTelephone;

    @XStreamAlias("TradeAmt")
    private String tradeAmt;

    @XStreamAlias("ProductType")
    private String productType;

    @XStreamAlias("ProductName")
    private String productName;

    @XStreamAlias("ViewProductUrl")
    private String viewProductUrl;

    @XStreamAlias("TradeCount")
    private String tradeCount;

    @XStreamAlias("InsuranceBeginTime")
    private String insuranceBeginTime;

    @XStreamAlias("OriginCode")
    private String originCode;

    @XStreamAlias("OriginTradeNo")
    private String originTradeNo;
}

工具类

XmlUtils

package com.yun.greedy.modules.util;

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.xml.Dom4JDriver;
import com.thoughtworks.xstream.security.AnyTypePermission;
import com.yun.greedy.modules.util.xstream.Package;
import com.yun.greedy.modules.util.xstream.*;
import org.dom4j.DocumentFactory;
import org.dom4j.io.OutputFormat;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;

public class XmlUtils {

    /*
     * 将XML报文转化为java对象
     */
    public static Object makeObjectFromXml(String docStr, Class[] classList) {
        XStream xstream = new XStream(new Dom4JDriver());
        //由于对象默认开启安全防护，尽量限制最低权限
        xstream.addPermission(AnyTypePermission.ANY);
        xstream.processAnnotations(classList);
        return xstream.fromXML(docStr);
    }

    /**
     * 将对象转化为xml报文
     *
     * @param object
     * @param b      是否显示为空的节点
     * @return
     */
    public static String objectToXml(Object object, boolean b) {
        if (b) {
            replaceNullValue(object);
        }
        OutputFormat outputFormat = new OutputFormat();
        outputFormat.setEncoding("UTF-8");
        outputFormat.setNewLineAfterDeclaration(false);//对象名称是否显示路径
//    outputFormat.setIndent(" ");
        outputFormat.setNewlines(true);//XML节点换行
        XStream xstream = new XStream(new Dom4JDriver(new DocumentFactory(), outputFormat));
        xstream.autodetectAnnotations(true);
        return xstream.toXML(object);
    }

    /**
     * changeFiledValue(替换字符串为null值的情况)
     *
     * @param obj
     * @return void
     */
    private static void replaceNullValue(Object obj) {
        if (obj == null) {
            return;
        }
        Field[] fields = obj.getClass().getDeclaredFields();
        for (Field field : fields) {
            try {
                String type = field.getType().getName();
                field.setAccessible(true);
                Object value = field.get(obj);
                if ("java.lang.String".equals(type)) {
                    String genericStr = field.toGenericString();
                    if (!genericStr.contains("final")) {
                        field.set(obj, (value == null ? "" : value));
                    }
                } else if ("java.util.List".equals(type)) {
                    List list = (List) value;
                    if (list != null && list.size() > 0) {
                        for (int i = 0; i < list.size(); i++) {
                            Object subObj = list.get(i);
                            replaceNullValue(subObj);
                        }
                    }
                } else {
                    replaceNullValue(value);
                }
            } catch (IllegalArgumentException e) {
                e.printStackTrace();
                System.out.println("返回报文对象替换null值出错：" + e.getMessage());
            } catch (IllegalAccessException e) {
                e.printStackTrace();
                System.out.println("返回报文对象替换null值出错：" + e.getMessage());
            }
        }
    }

    public static void main(String[] args) {
        String strXML = "<?xml version='1.0' encoding='UTF-8'?>\n" +
                "<Package>\n" +
                "    <Header>\n" +
                "        <RequestType>131</RequestType>\n" +
                "        <SystemNo>001</SystemNo>\n" +
                "        <SendTime>2024-06-05 09:53:38</SendTime>\n" +
                "        <Status>100</Status>\n" +
                "        <ErrorMessage />\n" +
                "    </Header>\n" +
                "    <Sign>NgJzJyhoeXYd/TJvJitByhUR1UVMJ+FjuMl4WVBjP0CsOM6owyX9nCn1c/IL+OpVeSYkl4k60Du8nLa13wRB1oqFA8I2zel9+Xiq7lAL0otIcdww4F9i5uULk2wpq8ApXcghO5suL54FPOutc+2gWNUUmdP6fb2/L2RFKOlcBig=</Sign>\n" +
                "    <Response>\n" +
                "        <DepartmentCode>5</DepartmentCode>\n" +
                "        <TransSourceCode>0</TransSourceCode>\n" +
                "        <PayNo />\n" +
                "        <PayAmount>100</PayAmount>\n" +
                "        <RealPayAmount>100</RealPayAmount>\n" +
                "        <PaymentTime>2024-06-05 09:50:49</PaymentTime>\n" +
                "        <DealTime>2024-06-05 09:50:49</DealTime>\n" +
                "        <PayType>1</PayType>\n" +
                "        <PlatformCode>35</PlatformCode>\n" +
                "        <PlatformName />\n" +
                "        <OrderId>1000000001678451</OrderId>\n" +
                "        <OrderStatus>2</OrderStatus>\n" +
                "        <PageUrl>https://blog.csdn.net/weixin_59383491?type=blog</PageUrl>\n" +
                "        <NotifyUrl>https://blog.csdn.net/weixin_59383491?type=blog</NotifyUrl>\n" +
                "        <AutoErrMsg />\n" +
                "        <BusinessTypeDetail />\n" +
                "        <BusinessType />\n" +
                "        <TradeList>\n" +
                "            <TradeIfo>\n" +
                "                <ProductId />\n" +
                "                <ApplyPolicyNo />\n" +
                "                <PersonnelName />\n" +
                "                <PlanCode />\n" +
                "                <ProductName>一百减一是零</ProductName>\n" +
                "                <BatchDetailNo>1010000202400000065</BatchDetailNo>\n" +
                "                <ProductType>7</ProductType>\n" +
                "                <BatchPolicyNo />\n" +
                "                <TradeDetailNo />\n" +
                "                <TradeAmt>100</TradeAmt>\n" +
                "                <OriginCode />\n" +
                "                <OriginTradeNo />\n" +
                "            </TradeIfo>\n" +
                "        </TradeList>\n" +
                "    </Response>\n" +
                "</Package>";
        Class[] classes = {Package.class, Header.class, Response.class, TradeInfo.class};
        Package packageObj = (Package) XmlUtils.makeObjectFromXml(strXML, classes);
        String str = null != packageObj ?
                "XML解析成功！" + packageObj.toString() : "报文解析失败！";
        System.out.println("========XML转对象========");
        System.out.println(str);
        Request re = new Request();
        re.setDepartmentCode("123");
        re.setTransSourceCode("TS");
        re.setBankType("CS");
        re.setPageUrl("https://blog.csdn.net/weixin_59383491?type=blog");
        TradeInfo tradeInfo = new TradeInfo();
        tradeInfo.setPersonnelName("一百减一是零");
        tradeInfo.setViewProductUrl("https://blog.csdn.net/weixin_59383491?type=blog");
        TradeInfo tradeInfo2 = new TradeInfo();
        tradeInfo2.setPersonnelName("一百减一是零");
        tradeInfo2.setViewProductUrl("https://blog.csdn.net/weixin_59383491?type=blog");
        List<TradeInfo> tradeInfoList = new ArrayList<>();
        tradeInfoList.add(tradeInfo);
        tradeInfoList.add(tradeInfo2);
        re.setTradeList(tradeInfoList);
        System.out.println("========对象转XML========");
        String s = XmlUtils.objectToXml(re, false);
        System.out.println(s);

    }
}

执行结果