使用XStream解析复杂的XML文件

XML 前端之家
前端之家收集整理的这篇文章主要介绍了使用XStream解析复杂的XML文件，前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。
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：

  1. <IR>
  2.   <UserDetails>
  3.     <UID>guest</UID>
  4.     <UType>JLJE89dd8DasGds6es</UType>
  5.     <UToken>DG8kxkSEO903kdm8e2j4Kds8d</UToken>
  6.   </UserDetails>
  7.   <MainContext>
  8.     <CID>ctx000001</CID>
  9.     <Banner>
  10.       <RepName>repname</RepName>
  11.     </Banner>
  12.     <GuidedFlows>
  13.       <GFContext GFType="nav">
  14.         <GFCID>gf0001</GFCID>
  15.         <GFRep>
  16.           <RepName>test</RepName>
  17.         </GFRep>
  18.         <Method Action="method">http://fdsf....</Method>
  19.         <Parameters>
  20.           <Param>
  21.             <Location>location</Location>
  22.             <ValidateMethod>validate method</ValidateMethod>
  23.           </Param>
  24.         </Parameters>
  25.       </GFContext>
  26.       <GFContext GFType="nav">
  27.         <GFCID>gf0002</GFCID>
  28.         <GFRep>
  29.           <RepName>test2</RepName>
  30.         </GFRep>
  31.         <Method Action="method2">http://fdsf....</Method>
  32.         <Parameters>
  33.           <Param>
  34.             <Location>location2</Location>
  35.             <ValidateMethod>validate method2</ValidateMethod>
  36.           </Param>
  37.         </Parameters>
  38.       </GFContext>
  39.       <GFContext GFType="nav">
  40.         <GFCID>gf0003</GFCID>
  41.         <GFRep>
  42.           <RepName>test3</RepName>
  43.         </GFRep>
  44.         <Method Action="method3">http://fdsf....</Method>
  45.         <Parameters>
  46.           <Param>
  47.             <Location>location3</Location>
  48.             <ValidateMethod>validate method3</ValidateMethod>
  49.           </Param>
  50.         </Parameters>
  51.       </GFContext>
  52.     </GuidedFlows>
  53.   </MainContext>
  54. </IR>
定义实体类：

UserDetails： 

  1. public class UserDetails {
  2.     
  3.           private String UID;
  4.           private String UType;
  5.           private String UToken;
  6.          
  7.           public UserDetails(String UID,String UType,String uToken) {
  8.                this.UID = UID;
  9.                this.UType = UType;
  10.                this.UToken = uToken;
  11.           }
  12.     
  13.           public String getUID() {
  14.                return UID;
  15.           }
  16.     
  17.           public void setUID(String uID) {
  18.                UID = uID;
  19.           }
  20.     
  21.           public String getUType() {
  22.                return UType;
  23.           }
  24.     
  25.           public void setUType(String uType) {
  26.                UType = uType;
  27.           }
  28.     
  29.           public String getUToken() {
  30.                return UToken;
  31.           }
  32.     
  33.           public void setUToken(String uToken) {
  34.                UToken = uToken;
  35.           }
  36.     
  37.           @Override
  38.           public String toString() {
  39.                return "UserDetails [UID=" + UID + ",UType=" + UType + ",UToken="
  40.                          + UToken + "]";
  41.           }
  42.      }

MainContext： 

  1. import java.util.ArrayList;
  2.      import java.util.List;
  3.     
  4.      public class MainContext {
  5.          
  6.           private String CID;
  7.           private Banner Banner;
  8.           private List<GFContext> GFContext = new ArrayList<GFContext>();
  9.          
  10.           public MainContext(String CID,Banner Banner,List<GFContext> GFContext) {
  11.                this.CID = CID;
  12.                this.Banner = Banner;
  13.                this.GFContext = GFContext;
  14.           }
  15.     
  16.           public String getCID() {
  17.                return CID;
  18.           }
  19.     
  20.           public void setCID(String cID) {
  21.                CID = cID;
  22.           }
  23.     
  24.           public Banner getBanner() {
  25.                return Banner;
  26.           }
  27.     
  28.           public void setBanner(Banner banner) {
  29.                Banner = banner;
  30.           }
  31.     
  32.           public List<GFContext> getGFContext() {
  33.                return GFContext;
  34.           }
  35.     
  36.           public void setGFContext(List<GFContext> gFContext) {
  37.                GFContext = gFContext;
  38.           }
  39.     
  40.           @Override
  41.           public String toString() {
  42.                return "MainContext [CID=" + CID + ",Banner=" + Banner
  43.                          + ",GuidedFlows=" + GFContext + "]";
  44.           }
  45.      }

Banner： 

  1.  public class Banner {
  2.          
  3.           private String RepName;
  4.          
  5.           public Banner(String RepName){
  6.                this.RepName = RepName;
  7.           }
  8.     
  9.           public String getRepName() {
  10.                return RepName;
  11.           }
  12.     
  13.           public void setRepName(String repName) {
  14.                RepName = repName;
  15.           }
  16.     
  17.           @Override
  18.           public String toString() {
  19.                return "Banner [RepName=" + RepName + "]";
  20.           }
  21.      }

GFContext： 

  1.  public class GFContext {
  2.          
  3.           private String GFType;
  4.           private String GFCID;
  5.           private GFRep GFRep;
  6.           private Method Method;
  7.           private Parameters Parameters;
  8.          
  9.           public GFContext(String GFType,String GFCID,GFRep GFRep,Method Method,Parameters Parameters){
  10.                this.GFType = GFType;
  11.                this.GFCID = GFCID;
  12.                this.GFRep = GFRep;
  13.                this.Method = Method;
  14.                this.Parameters = Parameters;
  15.           }
  16.     
  17.           public String getGFType() {
  18.                return GFType;
  19.           }
  20.     
  21.           public void setGFType(String gFType) {
  22.                this.GFType = gFType;
  23.           }
  24.     
  25.           public String getGFCID() {
  26.                return GFCID;
  27.           }
  28.     
  29.           public void setGFCID(String gFCID) {
  30.                this.GFCID = gFCID;
  31.           }
  32.     
  33.           public GFRep getGFRep() {
  34.                return GFRep;
  35.           }
  36.     
  37.           public void setGFRep(GFRep gFRep) {
  38.                this.GFRep = gFRep;
  39.           }
  40.     
  41.           public Method getMethod() {
  42.                return Method;
  43.           }
  44.     
  45.           public void setMethod(Method Method) {
  46.                this.Method = Method;
  47.           }
  48.     
  49.           public Parameters getParameters() {
  50.                return Parameters;
  51.           }
  52.     
  53.           public void setParameters(Parameters parameters) {
  54.                this.Parameters = parameters;
  55.           }
  56.     
  57.           @Override
  58.           public String toString() {
  59.                return "GFContext [GFType=" + GFType + ",GFCID=" + GFCID + ",GFRep="
  60.                          + GFRep + ",Method=" + Method + ",Parameters=" + Parameters
  61.                          + "]";
  62.           }
  63.     
  64.      }

GFRep： 

  1. public class GFRep {
  2.     
  3.           private String RepName;
  4.           private String RepURL;
  5.          
  6.           public GFRep(String RepName) {
  7.                this.RepName = RepName;
  8.           }
  9.     
  10.           public GFRep(String RepName,String RepURL) {
  11.                this.RepName = RepName;
  12.                this.RepURL = RepURL;
  13.           }
  14.     
  15.           public String getRepName() {
  16.                return RepName;
  17.           }
  18.     
  19.           public void setRepName(String repName) {
  20.                RepName = repName;
  21.           }
  22.     
  23.           public String getRepURL() {
  24.                return RepURL;
  25.           }
  26.     
  27.           public void setRepURL(String repURL) {
  28.                RepURL = repURL;
  29.           }
  30.     
  31.           @Override
  32.           public String toString() {
  33.                return "GFRep [RepName=" + RepName + ",RepURL=" + RepURL + "]";
  34.           }
  35.     
  36.      }

Method： 

  1. public class Method {
  2.          
  3.           private String Action;
  4.           private String value;
  5.          
  6.           public Method(){
  7.           }
  8.          
  9.           public Method(String value){
  10.                this.value = value;
  11.           }
  12.          
  13.           public Method(String Action,String value){
  14.                this.Action = Action;
  15.                this.value = value;
  16.           }
  17.     
  18.           public String getAction() {
  19.                return Action;
  20.           }
  21.     
  22.           public void setAction(String action) {
  23.                Action = action;
  24.           }
  25.     
  26.           public String getValue() {
  27.                return value;
  28.           }
  29.     
  30.           public void setValue(String value) {
  31.                this.value = value;
  32.           }
  33.     
  34.           @Override
  35.           public String toString() {
  36.                return "Method [Action=" + Action + ",value=" + value + "]";
  37.           }
  38.     
  39.      }

Parameters： 

  1. public class Parameters {
  2.          
  3.           private Param Param;
  4.     
  5.           public Parameters(Param Param) {
  6.                this.Param = Param;
  7.           }
  8.     
  9.           public Param getParam() {
  10.                return Param;
  11.           }
  12.     
  13.           public void setParam(Param param) {
  14.                Param = param;
  15.           }
  16.     
  17.           @Override
  18.           public String toString() {
  19.                return "Parameters [Param=" + Param + "]";
  20.           }
  21.      }


Param： 

  1. <span style="font-family:Courier New;font-size:12px;">public class Param {
  2.     
  3.           private String Location;
  4.           private String ValidateMethod;
  5.          
  6.           public Param(String Location) {
  7.                this.Location = Location;
  8.           }
  9.          
  10.           public Param(String Location,String ValidateMethod) {
  11.                this.Location = Location;
  12.                this.ValidateMethod = ValidateMethod;
  13.           }
  14.     
  15.           public String getLocation() {
  16.                return Location;
  17.           }
  18.     
  19.           public void setLocation(String location) {
  20.                Location = location;
  21.           }
  22.     
  23.           public String getValidateMethod() {
  24.                return ValidateMethod;
  25.           }
  26.     
  27.           public void setValidateMethod(String validateMethod) {
  28.                ValidateMethod = validateMethod;
  29.           }
  30.     
  31.           @Override
  32.           public String toString() {
  33.                return "Param [location=" + Location + ",validateMethod="
  34.                          + ValidateMethod + "]";
  35.           }
  36.      }</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: 


  1. <span style="font-family:Courier New;font-size:12px;">import com.thoughtworks.xstream.converters.Converter;
  2.      import com.thoughtworks.xstream.converters.MarshallingContext;
  3.      import com.thoughtworks.xstream.converters.UnmarshallingContext;
  4.      import com.thoughtworks.xstream.io.HierarchicalStreamReader;
  5.      import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
  6.     
  7.      public class MethodConverter implements Converter {
  8.     
  9.           public boolean canConvert(Class clazz) {
  10.                return clazz.equals(Method.class);
  11.           }
  12.          
  13.           public void marshal(Object value,HierarchicalStreamWriter writer,MarshallingContext context) {
  14.              Method method = (Method)value;
  15.              if (method!=null) {
  16.                  writer.addAttribute("Action",method.getAction());
  17.                  writer.setValue(method.getValue());
  18.              }
  19.           }
  20.     
  21.           @Override
  22.           public Object unmarshal(HierarchicalStreamReader reader,UnmarshallingContext context) {
  23.                Method method = new Method();
  24.                String action = reader.getAttribute("Action");
  25.                method.setAction(action);
  26.                System.out.println(">>> Action: "+action);
  27.                String value = reader.getValue();
  28.                System.out.println(">>> method: "+value+",NodeName: "+reader.getNodeName());
  29.                method.setValue(value);
  30.               
  31.                return method;
  32.           }
  33.      }</span>

测试代码：

1. Object生成XML

xStreanTest.java

 
  1. <span style="font-family:Courier New;font-size:12px;"> import java.util.ArrayList;
  2.      import java.util.List;
  3.     
  4.      import com.thoughtworks.xstream.XStream;
  5.     
  6.      public class xStreanTest {
  7.     
  8.           /**
  9.           * @param args
  10.           */
  11.           public static void main(String[] args) {
  12.               
  13.                GFRep gfrep = new GFRep("test");
  14.               
  15.                Param param = new Param("location","validate method");
  16.               
  17.                Parameters p = new Parameters(param);
  18.               
  19.                List<GFContext> ls = new ArrayList<GFContext>();
  20.                GFContext gfcontext = new GFContext("nav","gf0001",gfrep,new Method("method","http://fdsf...."),p);
  21.                ls.add(gfcontext);
  22.               
  23.                gfrep = new GFRep("test2");
  24.                param = new Param("location2","validate method2");
  25.                p = new Parameters(param);
  26.                gfcontext = new GFContext("nav","gf0002",new Method("method2",p);
  27.                ls.add(gfcontext);
  28.               
  29.                gfrep = new GFRep("test3");
  30.                param = new Param("location3","validate method3");
  31.                p = new Parameters(param);
  32.                gfcontext = new GFContext("nav","gf0003",new Method("method3",p);
  33.                ls.add(gfcontext);
  34.               
  35.               
  36.               
  37.                //GuidedFlows gf = new GuidedFlows(ls);
  38.               
  39.                Banner banner = new Banner("repname");
  40.               
  41.                MainContext mc = new MainContext("ctx000001",banner,ls);
  42.               
  43.                UserDetails ud = new UserDetails("guest","JLJE89dd8DasGds6es","starhub");
  44.               
  45.                MLoginIR mir = new MLoginIR(ud,mc);
  46.               
  47.                XStream xstream = new XStream();
  48.                xstream.registerConverter(new MethodConverter());
  49.                xstream.alias("IR",MLoginIR.class);
  50.                xstream.alias("UserDetails",UserDetails.class);
  51.                xstream.alias("MainContext",MainContext.class);
  52.                xstream.alias("Banner",Banner.class);
  53.                //xstream.alias("GuidedFlows",GuidedFlows.class);
  54.                xstream.alias("GFContext",GFContext.class);
  55.                xstream.alias("GFRep",GFRep.class);
  56.                xstream.alias("Parameters",Parameters.class);
  57.                xstream.alias("Param",Param.class);
  58.                //xstream.alias("RepName",RepName.class);
  59.               
  60.                xstream.aliasField("GuidedFlows",MainContext.class,"GFContext");
  61.                xstream.useAttributeFor(GFContext.class,"GFType");
  62.                xstream.useAttributeFor(Method.class,"Action");
  63.                String xml = xstream.toXML(mir);
  64.                System.out.println(xml);
  65.               
  66.                MLoginIR m = (MLoginIR)xstream.fromXML(xml);
  67.                System.out.println(m);
  68.           }
  69.     
  70.      }</span>

2. XML转Object

xStreanTest2.java

 
  1. <span style="font-family:Courier New;font-size:12px;">import java.util.ArrayList;
  2. import java.util.List;
  3.  
  4. import com.thoughtworks.xstream.XStream;
  5.  
  6. public class xStreanTest2 {
  7.  
  8.      /**
  9.      * @param args
  10.      */
  11.      public static void main(String[] args) {
  12.     
  13.           String xml = "TODO";
  14.     
  15.           XStream xstream = new XStream();
  16.           xstream.registerConverter(new MethodConverter());
  17.           xstream.alias("IR",MLoginIR.class);
  18.           xstream.alias("UserDetails",UserDetails.class);
  19.           xstream.alias("MainContext",MainContext.class);
  20.           xstream.alias("Banner",Banner.class);
  21.           xstream.alias("GFContext",GFContext.class);
  22.           xstream.alias("GFRep",GFRep.class);
  23.           xstream.alias("Parameters",Parameters.class);
  24.           xstream.alias("Param",Param.class);
  25.           //xstream.alias("RepName",RepName.class);
  26.           xstream.alias("Method",Method.class);
  27.           xstream.aliasField("GuidedFlows","GFContext");
  28.           xstream.useAttributeFor(GFContext.class,"GFType");
  29.           xstream.useAttributeFor(Method.class,"Action");
  30.           MLoginIR newIR = (MLoginIR)xstream.fromXML(xml);
  31.           System.out.println(newIR.getUserDetails());
  32.           List<GFContext> ls_gf = newIR.getMainContext().getGFContext();
  33.           Banner banner = newIR.getMainContext().getBanner();
  34.           System.out.println(banner);
  35.           for(GFContext gf : ls_gf){
  36.                System.out.println("gf:"+gf);
  37.                GFRep gfrep = gf.getGFRep();
  38.                System.out.println(gfrep);
  39.                Parameters p = gf.getParameters();
  40.                System.out.println(p);
  41.                Param p2 = p.getParam();
  42.                System.out.println(p2);
  43.                Method m = gf.getMethod();
  44.                System.out.println(m);
  45.                System.out.println("==================================");
  46.           }
  47.     
  48.      }
  49.     
  50. }     </span>

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