使用XStream解析复杂的XML文件

XStream在实现Java、xml之间转换非常的出色。但是有时候一些比较复杂的XML文件就不好下手，在此以如下XML为例演示了XML to Object，Object to XML的过程。

依赖包：
xstream-1.3.1.jar
xpp3_min-1.1.4c.jar

XML文件：

<IR>
  <UserDetails>
    <UID>guest</UID>
    <UType>JLJE89dd8DasGds6es</UType>
    <UToken>DG8kxkSEO903kdm8e2j4Kds8d</UToken>
  </UserDetails>
  <MainContext>
    <CID>ctx000001</CID>
    <Banner>
      <RepName>repname</RepName>
    </Banner>
    <GuidedFlows>
      <GFContext GFType="nav">
        <GFCID>gf0001</GFCID>
        <GFRep>
          <RepName>test</RepName>
        </GFRep>
        <Method Action="method">http://fdsf....</Method>
        <Parameters>
          <Param>
            <Location>location</Location>
            <ValidateMethod>validate method</ValidateMethod>
          </Param>
        </Parameters>
      </GFContext>
      <GFContext GFType="nav">
        <GFCID>gf0002</GFCID>
        <GFRep>
          <RepName>test2</RepName>
        </GFRep>
        <Method Action="method2">http://fdsf....</Method>
        <Parameters>
          <Param>
            <Location>location2</Location>
            <ValidateMethod>validate method2</ValidateMethod>
          </Param>
        </Parameters>
      </GFContext>
      <GFContext GFType="nav">
        <GFCID>gf0003</GFCID>
        <GFRep>
          <RepName>test3</RepName>
        </GFRep>
        <Method Action="method3">http://fdsf....</Method>
        <Parameters>
          <Param>
            <Location>location3</Location>
            <ValidateMethod>validate method3</ValidateMethod>
          </Param>
        </Parameters>
      </GFContext>
    </GuidedFlows>
  </MainContext>
</IR>

定义实体类：

UserDetails：

public class UserDetails {
    
          private String UID;
          private String UType;
          private String UToken;
         
          public UserDetails(String UID,String UType,String uToken) {
               this.UID = UID;
               this.UType = UType;
               this.UToken = uToken;
          }
    
          public String getUID() {
               return UID;
          }
    
          public void setUID(String uID) {
               UID = uID;
          }
    
          public String getUType() {
               return UType;
          }
    
          public void setUType(String uType) {
               UType = uType;
          }
    
          public String getUToken() {
               return UToken;
          }
    
          public void setUToken(String uToken) {
               UToken = uToken;
          }
    
          @Override
          public String toString() {
               return "UserDetails [UID=" + UID + ",UType=" + UType + ",UToken="
                         + UToken + "]";
          }
     }

MainContext：

import java.util.ArrayList;
     import java.util.List;
    
     public class MainContext {
         
          private String CID;
          private Banner Banner;
          private List<GFContext> GFContext = new ArrayList<GFContext>();
         
          public MainContext(String CID,Banner Banner,List<GFContext> GFContext) {
               this.CID = CID;
               this.Banner = Banner;
               this.GFContext = GFContext;
          }
    
          public String getCID() {
               return CID;
          }
    
          public void setCID(String cID) {
               CID = cID;
          }
    
          public Banner getBanner() {
               return Banner;
          }
    
          public void setBanner(Banner banner) {
               Banner = banner;
          }
    
          public List<GFContext> getGFContext() {
               return GFContext;
          }
    
          public void setGFContext(List<GFContext> gFContext) {
               GFContext = gFContext;
          }
    
          @Override
          public String toString() {
               return "MainContext [CID=" + CID + ",Banner=" + Banner
                         + ",GuidedFlows=" + GFContext + "]";
          }
     }

Banner：

 public class Banner {
         
          private String RepName;
         
          public Banner(String RepName){
               this.RepName = RepName;
          }
    
          public String getRepName() {
               return RepName;
          }
    
          public void setRepName(String repName) {
               RepName = repName;
          }
    
          @Override
          public String toString() {
               return "Banner [RepName=" + RepName + "]";
          }
     }

GFContext：

 public class GFContext {
         
          private String GFType;
          private String GFCID;
          private GFRep GFRep;
          private Method Method;
          private Parameters Parameters;
         
          public GFContext(String GFType,String GFCID,GFRep GFRep,Method Method,Parameters Parameters){
               this.GFType = GFType;
               this.GFCID = GFCID;
               this.GFRep = GFRep;
               this.Method = Method;
               this.Parameters = Parameters;
          }
    
          public String getGFType() {
               return GFType;
          }
    
          public void setGFType(String gFType) {
               this.GFType = gFType;
          }
    
          public String getGFCID() {
               return GFCID;
          }
    
          public void setGFCID(String gFCID) {
               this.GFCID = gFCID;
          }
    
          public GFRep getGFRep() {
               return GFRep;
          }
    
          public void setGFRep(GFRep gFRep) {
               this.GFRep = gFRep;
          }
    
          public Method getMethod() {
               return Method;
          }
    
          public void setMethod(Method Method) {
               this.Method = Method;
          }
    
          public Parameters getParameters() {
               return Parameters;
          }
    
          public void setParameters(Parameters parameters) {
               this.Parameters = parameters;
          }
    
          @Override
          public String toString() {
               return "GFContext [GFType=" + GFType + ",GFCID=" + GFCID + ",GFRep="
                         + GFRep + ",Method=" + Method + ",Parameters=" + Parameters
                         + "]";
          }
    
     }

GFRep：

public class GFRep {
    
          private String RepName;
          private String RepURL;
         
          public GFRep(String RepName) {
               this.RepName = RepName;
          }
    
          public GFRep(String RepName,String RepURL) {
               this.RepName = RepName;
               this.RepURL = RepURL;
          }
    
          public String getRepName() {
               return RepName;
          }
    
          public void setRepName(String repName) {
               RepName = repName;
          }
    
          public String getRepURL() {
               return RepURL;
          }
    
          public void setRepURL(String repURL) {
               RepURL = repURL;
          }
    
          @Override
          public String toString() {
               return "GFRep [RepName=" + RepName + ",RepURL=" + RepURL + "]";
          }
    
     }

Method：

public class Method {
         
          private String Action;
          private String value;
         
          public Method(){
          }
         
          public Method(String value){
               this.value = value;
          }
         
          public Method(String Action,String value){
               this.Action = Action;
               this.value = value;
          }
    
          public String getAction() {
               return Action;
          }
    
          public void setAction(String action) {
               Action = action;
          }
    
          public String getValue() {
               return value;
          }
    
          public void setValue(String value) {
               this.value = value;
          }
    
          @Override
          public String toString() {
               return "Method [Action=" + Action + ",value=" + value + "]";
          }
    
     }

Parameters：

public class Parameters {
         
          private Param Param;
    
          public Parameters(Param Param) {
               this.Param = Param;
          }
    
          public Param getParam() {
               return Param;
          }
    
          public void setParam(Param param) {
               Param = param;
          }
    
          @Override
          public String toString() {
               return "Parameters [Param=" + Param + "]";
          }
     }

Param：

<span style="font-family:Courier New;font-size:12px;">public class Param {
    
          private String Location;
          private String ValidateMethod;
         
          public Param(String Location) {
               this.Location = Location;
          }
         
          public Param(String Location,String ValidateMethod) {
               this.Location = Location;
               this.ValidateMethod = ValidateMethod;
          }
    
          public String getLocation() {
               return Location;
          }
    
          public void setLocation(String location) {
               Location = location;
          }
    
          public String getValidateMethod() {
               return ValidateMethod;
          }
    
          public void setValidateMethod(String validateMethod) {
               ValidateMethod = validateMethod;
          }
    
          @Override
          public String toString() {
               return "Param [location=" + Location + ",validateMethod="
                         + ValidateMethod + "]";
          }
     }</span>

由于我们需要实现类似：<field name="value">I am a Field.</Method>这样的效果。因此，我们需要实现一个Converter。这个很关键，也是我试了好久才解决的问题，在此也分享一下：

MethodConverter.java:

<span style="font-family:Courier New;font-size:12px;">import com.thoughtworks.xstream.converters.Converter;
     import com.thoughtworks.xstream.converters.MarshallingContext;
     import com.thoughtworks.xstream.converters.UnmarshallingContext;
     import com.thoughtworks.xstream.io.HierarchicalStreamReader;
     import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
    
     public class MethodConverter implements Converter {
    
          public boolean canConvert(Class clazz) {
               return clazz.equals(Method.class);
          }
         
          public void marshal(Object value,HierarchicalStreamWriter writer,MarshallingContext context) {
             Method method = (Method)value;
             if (method!=null) {
                 writer.addAttribute("Action",method.getAction());
                 writer.setValue(method.getValue());
             }
          }
    
          @Override
          public Object unmarshal(HierarchicalStreamReader reader,UnmarshallingContext context) {
               Method method = new Method();
               String action = reader.getAttribute("Action");
               method.setAction(action);
               System.out.println(">>> Action: "+action);
               String value = reader.getValue();
               System.out.println(">>> method: "+value+",NodeName: "+reader.getNodeName());
               method.setValue(value);
              
               return method;
          }
     }</span>

测试代码：

1. Object生成XML

xStreanTest.java@H_301_153@

<span style="font-family:Courier New;font-size:12px;"> import java.util.ArrayList;
     import java.util.List;
    
     import com.thoughtworks.xstream.XStream;
    
     public class xStreanTest {
    
          /**
          * @param args
          */
          public static void main(String[] args) {
              
               GFRep gfrep = new GFRep("test");
              
               Param param = new Param("location","validate method");
              
               Parameters p = new Parameters(param);
              
               List<GFContext> ls = new ArrayList<GFContext>();
               GFContext gfcontext = new GFContext("nav","gf0001",gfrep,new Method("method","http://fdsf...."),p);
               ls.add(gfcontext);
              
               gfrep = new GFRep("test2");
               param = new Param("location2","validate method2");
               p = new Parameters(param);
               gfcontext = new GFContext("nav","gf0002",new Method("method2",p);
               ls.add(gfcontext);
              
               gfrep = new GFRep("test3");
               param = new Param("location3","validate method3");
               p = new Parameters(param);
               gfcontext = new GFContext("nav","gf0003",new Method("method3",p);
               ls.add(gfcontext);
              
              
              
               //GuidedFlows gf = new GuidedFlows(ls);
              
               Banner banner = new Banner("repname");
              
               MainContext mc = new MainContext("ctx000001",banner,ls);
              
               UserDetails ud = new UserDetails("guest","JLJE89dd8DasGds6es","starhub");
              
               MLoginIR mir = new MLoginIR(ud,mc);
              
               XStream xstream = new XStream();
               xstream.registerConverter(new MethodConverter());
               xstream.alias("IR",MLoginIR.class);
               xstream.alias("UserDetails",UserDetails.class);
               xstream.alias("MainContext",MainContext.class);
               xstream.alias("Banner",Banner.class);
               //xstream.alias("GuidedFlows",GuidedFlows.class);
               xstream.alias("GFContext",GFContext.class);
               xstream.alias("GFRep",GFRep.class);
               xstream.alias("Parameters",Parameters.class);
               xstream.alias("Param",Param.class);
               //xstream.alias("RepName",RepName.class);
              
               xstream.aliasField("GuidedFlows",MainContext.class,"GFContext");
               xstream.useAttributeFor(GFContext.class,"GFType");
               xstream.useAttributeFor(Method.class,"Action");
               String xml = xstream.toXML(mir);
               System.out.println(xml);
              
               MLoginIR m = (MLoginIR)xstream.fromXML(xml);
               System.out.println(m);
          }
    
     }</span>

2. XML转Object

xStreanTest2.java@H_301_153@

<span style="font-family:Courier New;font-size:12px;">import java.util.ArrayList;
import java.util.List;

import com.thoughtworks.xstream.XStream;

public class xStreanTest2 {

     /**
     * @param args
     */
     public static void main(String[] args) {
    
          String xml = "TODO";
    
          XStream xstream = new XStream();
          xstream.registerConverter(new MethodConverter());
          xstream.alias("IR",MLoginIR.class);
          xstream.alias("UserDetails",UserDetails.class);
          xstream.alias("MainContext",MainContext.class);
          xstream.alias("Banner",Banner.class);
          xstream.alias("GFContext",GFContext.class);
          xstream.alias("GFRep",GFRep.class);
          xstream.alias("Parameters",Parameters.class);
          xstream.alias("Param",Param.class);
          //xstream.alias("RepName",RepName.class);
          xstream.alias("Method",Method.class);
          xstream.aliasField("GuidedFlows","GFContext");
          xstream.useAttributeFor(GFContext.class,"GFType");
          xstream.useAttributeFor(Method.class,"Action");
          MLoginIR newIR = (MLoginIR)xstream.fromXML(xml);
          System.out.println(newIR.getUserDetails());
          List<GFContext> ls_gf = newIR.getMainContext().getGFContext();
          Banner banner = newIR.getMainContext().getBanner();
          System.out.println(banner);
          for(GFContext gf : ls_gf){
               System.out.println("gf:"+gf);
               GFRep gfrep = gf.getGFRep();
               System.out.println(gfrep);
               Parameters p = gf.getParameters();
               System.out.println(p);
               Param p2 = p.getParam();
               System.out.println(p2);
               Method m = gf.getMethod();
               System.out.println(m);
               System.out.println("==================================");
          }
    
     }
    
}     </span>

原文链接：https://www.f2er.com/xml/298302.html

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