首先需要引入kabeja这个包
个人理解：DXF图纸是由一张张图层(DXFLayer)组成的，一张张图层又是由一个个实体类(DXFEntity)组成的，至于块（DXFBlock）呢，我理解的他就是一个模板，也是由一个个的实体类组成，而图层中的实体类有可能就是通过模型插入的，而通过块所插入的实体类的类型就是DXFInsert（该类是DXFEntity的子类），具体可看上面链接的api。
直接上代码：
package parse;import java.awt.Polygon;import java.io.File;import java.io.FileInputStream;import java.util.Collections;import java.util.HashSet;import java.util.List;import java.util.ArrayList;import java.util.Set;import java.util.Iterator;import java.util.Properties;import org.kabeja.dxf.DXFConstants;import org.kabeja.dxf.DXFDocument;import org.kabeja.dxf.DXFEntity;import org.kabeja.dxf.DXFLWPolyline;import org.kabeja.dxf.DXFLayer;import org.kabeja.dxf.DXFLine;import org.kabeja.dxf.DXFMText;import org.kabeja.dxf.DXFVertex;import org.kabeja.dxf.helpers.Point;import org.kabeja.parser.DXFParser;import org.kabeja.parser.Parser;import org.kabeja.parser.ParserBuilder;import org.kabeja.dxf.DXFBlock;import org.kabeja.dxf.DXFLineType;import org.kabeja.dxf.DXFDimensionStyle;import org.kabeja.dxf.objects.DXFObject;import org.kabeja.dxf.DXFStyle;import org.kabeja.dxf.DXFView;import org.kabeja.dxf.DXFViewport;import org.kabeja.dxf.DXFVariable;import org.kabeja.dxf.objects.DXFDictionary;import org.kabeja.dxf.DXFHatchPattern;import org.kabeja.dxf.DXFInsert;import org.kabeja.dxf.DXFLeader;import org.kabeja.dxf.Bounds;public class DXFUtil {public static void main(String[] args) throws Exception{Parser dxfParser = ParserBuilder.createDefaultParser();dxfParser.parse(new FileInputStream("C:/Users/Administrator/Desktop/CAD_/28F平面图-0819.dxf"), "UTF-8");DXFDocument doc = dxfParser.getDocument();// getDXFViewports(doc);// while(doc.getDXFHeader().getVarialbeIterator().hasNext()){// DXFVariable dv = (DXFVariable)doc.getDXFHeader().getVarialbeIterator().next();// System.out.println(dv.getName());// }// getDXFBlocks(doc);// getDXFLineTypes(doc);// getDXFStyles(doc);// getDXFViews(doc);getDXFLayers(doc);// getRootDXFDictionarys(doc);// getDXFHatchPatternIterators(doc);// for(DXFBlock d : dxfBlocks){// System.out.println(d.getName());// System.out.println(d.getLayerID());// }}//块列表 获取所有的的块（block）public static List<DXFBlock> getDXFBlocks(DXFDocument dxfdoc){List<DXFBlock> dxfBlocks = new ArrayList<DXFBlock>();Iterator iter = dxfdoc.getDXFBlockIterator();while(iter.hasNext()){DXFBlock dXFBlock = (DXFBlock)iter.next();//System.out.println("LayerID: "+dXFBlock.getLayerID()+" Name: "+dXFBlock.getName()+" description: "+dXFBlock.getDescription()+" document: "+dXFBlock.getDXFDocument()+" Ponit: "+dXFBlock.getReferencePoint());//System.out.println("LayerID: "+dXFBlock.getLayerID()+" Name: "+dXFBlock.getName()+" description: "+dXFBlock.getDescription()+" Ponit: "+dXFBlock.getReferencePoint()+" Buonds: "+dXFBlock.getBounds());Bounds b = dXFBlock.getBounds();System.out.println(" Name: "+dXFBlock.getName()+" depth: "+b.getDepth()+" width: "+b.getWidth()+" height: "+b.getHeight()+" "+b.getMaximumX()+","+b.getMaximumY()+","+b.getMaximumZ()+" "+b.getMinimumX()+","+b.getMinimumY()+","+b.getMinimumZ());//List<DXFEntity> l = getEntityByDXFBlock(dXFBlock);//for(DXFEntity d : l){//System.out.println("ID: "+d.getID()+" Flags: "+d.getFlags()+" TYPE: "+d.getType());//}//System.out.println(l.size());//getLines(dxfdoc,dXFBlock.getLayerID());//while(dXFBlock.getDXFEntitiesIterator().hasNext()){//DXFEntity d = (DXFEntity)dXFBlock.getDXFEntitiesIterator().next();//if(d.isVisibile()){//System.out.println("Type: "+d.getType()+" ID: "+d.getID()+" LayerName: "+d.getLayerName());//}//}dxfBlocks.add(dXFBlock);}return dxfBlocks;}//获取所有的entity public static List<DXFEntity> getDXFEntities(DXFDocument dxfdoc){List<DXFEntity> list = new ArrayList<DXFEntity>();Iterator iter = dxfdoc.getDXFLayerIterator();while(iter.hasNext()){DXFLayer dXFLayer = (DXFLayer)iter.next();List<String> l = getDXFEntityTypes(dXFLayer);for(String s : l){List<DXFEntity> ld = dXFLayer.getDXFEntities(s);for(DXFEntity d : ld){list.add(d);System.out.println("ID: "+d.getID()+" Boolean:"+d.isBlockEntity());}}}return list;}//根据图层名称获取entitypublic static List<DXFEntity> getDXFEntitiesByLayerName(DXFDocument dxfdoc,String layerName){List<DXFEntity> list = new ArrayList<DXFEntity>();Iterator iter = dxfdoc.getDXFLayerIterator();while(iter.hasNext()){DXFLayer dXFLayer = (DXFLayer)iter.next();if(dXFLayer.getName().equals(layerName)){List<String> l = getDXFEntityTypes(dXFLayer);for(String s : l){List<DXFEntity> ld = dXFLayer.getDXFEntities(s);for(DXFEntity d : ld){list.add(d);System.out.println("ID: "+d.getID()+" Boolean:"+d.isBlockEntity());}}}}return list;}//图层列表 获取所有图层（layer）public static List<DXFLayer> getDXFLayers(DXFDocument dxfdoc){List<DXFLayer> dXFLayers = new ArrayList<DXFLayer>();Iterator iter = dxfdoc.getDXFLayerIterator();while(iter.hasNext()){DXFLayer dXFLayer = (DXFLayer)iter.next();//System.out.println("LayerName: "+dXFLayer.getName());//if(dXFLayer.isVisible() && dXFLayer.getName().equals("I-FURN")){if(dXFLayer.getName().equals("I-ROOM-NUB")){List<String> list = getDXFEntityTypes(dXFLayer);for(String s : list){System.out.println(s);//List<DXFEntity> l = dXFLayer.getDXFEntities(s);//for(DXFEntity d : l){//System.out.println("ID: "+d.getID()+" Boolean:"+d.isBlockEntity());//}//System.out.println(s);//if(s.equals("INSERT")){//List<DXFEntity> l = dXFLayer.getDXFEntities(s);//for(DXFEntity d : l){//DXFInsert i = (DXFInsert)d;//System.out.println("BlockID: "+i.getBlockID());//}//}if(s.equals("LEADER")){List<DXFEntity> l = dXFLayer.getDXFEntities(s);for(DXFEntity d : l){DXFLeader i = (DXFLeader)d;int a = i.getCoordinateCount();for(int k=0;k<a;k++){System.out.print(i.getCoordinateAt(k));System.out.print(" ");}System.out.println();}}}}dXFLayers.add(dXFLayer);}return dXFLayers;}//通过blockName获取entity 这个其实是一个坑，你从cad制图工具中你会发现DXFBlock是可以被引用的，引用DXFBlock的entity的类型就是INSERTpublic static List<DXFInsert> getDXFInsertByBlockName(DXFDocument dxfdoc,String blockName){List<DXFInsert> inserts = new ArrayList<DXFInsert>();Iterator iter = dxfdoc.getDXFLayerIterator();while(iter.hasNext()){DXFLayer dXFLayer = (DXFLayer)iter.next();System.out.println("LayerName: "+dXFLayer.getName());if(dXFLayer.isVisible()){List<String> list = getDXFEntityTypes(dXFLayer);for(String s : list){//System.out.println(s);if(s.equals("INSERT")){List<DXFEntity> l = dXFLayer.getDXFEntities(s);for(DXFEntity d : l){DXFInsert i = (DXFInsert)d;//System.out.println("ID: "+d.getID()+" Boolean:"+d.isBlockEntity());System.out.println("BlockID: "+i.getBlockID());if(blockName.equals(i.getBlockID())){inserts.add(i);}}}}}}return inserts;}//通过DXFBlock获取entitypublic static List<DXFEntity> getEntityByDXFBlock(DXFBlock dXFBlock){List<DXFEntity> list = new ArrayList<DXFEntity>();Iterator iter = dXFBlock.getDXFEntitiesIterator();while(iter.hasNext()){DXFEntity d = (DXFEntity)iter.next();//if(d.isVisibile()){//list.add(d);//}list.add(d);}return list;}//通过图层获取DXFEntityTypepublic static List<String> getDXFEntityTypes(DXFLayer dXFLayer){List<String> list = new ArrayList<String>();Iterator iter = dXFLayer.getDXFEntityTypeIterator();while(iter.hasNext()){String d = (String)iter.next();list.add(d);//System.out.println(d);}return list;}//getDXFLineTypeIterator() 线型public static List<DXFLineType> getDXFLineTypes(DXFDocument dxfdoc){List<DXFLineType> dXFLineTypes = new ArrayList<DXFLineType>();Iterator iter = dxfdoc.getDXFLineTypeIterator();while(iter.hasNext()){DXFLineType dXFLineType = (DXFLineType)iter.next();System.out.println("LineTypeName: "+dXFLineType.getName()+" Scale: "+dXFLineType.getScale()+" Description: "+dXFLineType.getDescritpion());dXFLineTypes.add(dXFLineType);}return dXFLineTypes;}//getDXFStyleIterator() public static List<DXFStyle> getDXFStyles(DXFDocument dxfdoc){List<DXFStyle> dXFStyles = new ArrayList<DXFStyle>();Iterator iter = dxfdoc.getDXFStyleIterator();while(iter.hasNext()){DXFStyle dXFStyle = (DXFStyle)iter.next();System.out.println("FontFile: "+dXFStyle.getFontFile()+" Name: "+dXFStyle.getName());dXFStyles.add(dXFStyle);}return dXFStyles;}//getDXFViewIterator()public static List<DXFView> getDXFViews(DXFDocument dxfdoc){List<DXFView> dXFViews = new ArrayList<DXFView>();Iterator iter = dxfdoc.getDXFViewIterator();while(iter.hasNext()){DXFView dXFView = (DXFView)iter.next();System.out.println("centerPoint: "+dXFView.getCenterPoint()+" Name: "+dXFView.getName()+" Vector: "+dXFView.getViewDirection());dXFViews.add(dXFView);}return dXFViews;}//getDXFViewportIterator() public static List<DXFViewport> getDXFViewports(DXFDocument dxfdoc){List<DXFViewport> dXFViewports = new ArrayList<DXFViewport>();Iterator iter = dxfdoc.getDXFViewportIterator();while(iter.hasNext()){DXFViewport dXFViewport = (DXFViewport)iter.next();System.out.println("CenterPoint: "+dXFViewport.getCenterPoint()+" PlotStyleName: "+dXFViewport.getPlotStyleName()+" VIewPointID: "+dXFViewport.getViewportID()+" VectorX: "+dXFViewport.getViewDirectionVector().getX()+" VectorY: "+dXFViewport.getViewDirectionVector().getY()+" VectorZ: "+dXFViewport.getViewDirectionVector().getZ());dXFViewports.add(dXFViewport);}return dXFViewports;}//getRootDXFDictionary()public static void getRootDXFDictionarys(DXFDocument dxfdoc){DXFDictionary d = dxfdoc.getRootDXFDictionary();Iterator iter = d.getDXFObjectIterator();while(iter.hasNext()){System.out.println(iter.next());}}//获取线public static void getLines(DXFDocument dxfdoc,String layerID){DXFLayer layer = dxfdoc.getDXFLayer(layerID);//get all polylines from the layerList plines = layer.getDXFEntities(DXFConstants.ENTITY_TYPE_LINE);//work with the first polylineDXFLine pline = (DXFLine) plines.get(0);System.out.println("start: "+pline.getStartPoint()+" end: "+pline.getEndPoint()); //使用polyline对象种特有的方法获得数据，如左获得该多边线总共的顶点数据}//getDXFHatchPatternIterator() public static void getDXFHatchPatternIterators(DXFDocument doc){Iterator iter = doc.getDXFHatchPatternIterator();while(iter.hasNext()){DXFHatchPattern d = (DXFHatchPattern)iter.next();System.out.println("ID: "+d.getID()+" DXFHatch: "+d.getDXFHatch()+" Count: "+d.getLineFamilyCount());}}////通过DXFDocument根据Id获取所有的DXFEntity//public static List<DXFEntity> getDXFEntitiesByDXFDocument(List<DXFEntity> l){//List<DXFEntity> list = new ArrayList<DXFEntity>();////return list;//}}
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