定义上下文行为，要继承Map

package com.wjz.core;import java.io.Serializable;import java.util.Map;public interface CustomSubjectContext extends Map
     
       {    void setSessionId(Serializable sessionId);        Serializable getSessionId();        void setAuthenticated(Boolean authc);        Boolean isAuthenticated();}
     

定义MapContext上下文，定义备份Map，实现备份Map的存取等关乎map的行为，实现Map

package com.wjz.core;import java.io.Serializable;import java.util.Collection;import java.util.Collections;import java.util.HashMap;import java.util.Map;import java.util.Set;import org.springframework.util.CollectionUtils;public class CustomMapContext implements Map
     
      , Serializable {    private static final long serialVersionUID = 6611136447999868186L;        private final Map
      
        backingMap;        public CustomMapContext() {        backingMap = new HashMap
       
        ();    }        public CustomMapContext(Map
        
          map) {        this();        if (!CollectionUtils.isEmpty(map)) {            this.backingMap.putAll(map);        }    }    @Override    public int size() {        return backingMap.size();    }    @Override    public boolean isEmpty() {        return backingMap.isEmpty();    }    @Override    public boolean containsKey(Object key) {        return backingMap.containsKey(key);    }    @Override    public boolean containsValue(Object value) {        return backingMap.containsValue(value);    }    @Override    public Object get(Object key) {        return backingMap.get(key);    }    @Override    public Object put(String key, Object value) {        return backingMap.put(key, value);    }    @Override    public Object remove(Object key) {        return backingMap.remove(key);    }    @Override    public void putAll(Map
          m) {        backingMap.putAll(m);    }    @Override    public void clear() {        backingMap.clear();    }    @Override    public Set
         
           keySet() {        return Collections.unmodifiableSet(backingMap.keySet());    }    @Override    public Collection
          
         
        
       
      
     

定义默认的上下文实现类，继承MapContext上下文，具体实现上下文

package com.wjz.core;import java.io.Serializable;public class DefaultCustomSubjectContext extends CustomMapContext implements CustomSubjectContext {    private static final long serialVersionUID = -273450905542274017L;        private static final String SESSION_ID = ".SESSION_ID";        private static final String AUTHC = ".AUTHC";    public DefaultCustomSubjectContext() {        super();    }        public DefaultCustomSubjectContext(CustomSubjectContext sctx) {        super(sctx);    }        @Override    public void setSessionId(Serializable sessionId) {        nullSafePut(SESSION_ID, sessionId);    }    @Override    public Serializable getSessionId() {        return getTypeValue(SESSION_ID, Serializable.class);    }    @Override    public void setAuthenticated(Boolean authc) {        nullSafePut(AUTHC, authc);    }    @Override    public Boolean isAuthenticated() {        return getTypeValue(AUTHC, Boolean.class);    }}

demo

package com.wjz.demo;import com.wjz.core.CustomSubjectContext;import com.wjz.core.DefaultCustomSubjectContext;public class CopyDemo {    public static void main(String[] args) {        CustomSubjectContext sctx = new DefaultCustomSubjectContext();        sctx.setSessionId("sctx 123456");        sctx.setAuthenticated(true);        System.out.println("sctx getSessionId :" + sctx.getSessionId());        System.out.println("sctx isAuthenticated :" + sctx.isAuthenticated());        System.out.println();        CustomSubjectContext copy = new DefaultCustomSubjectContext(sctx);        copy.setSessionId("copy 123456");        System.out.println("copy getSessionId :" + copy.getSessionId());        System.out.println("copy isAuthenticated :" + copy.isAuthenticated());    }}