jbpm4.4根据.jpdl.xml流程定义文件,得到流程图.png

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jbpm4.4根据.jpdl.xml流程定义文件,得到流程图.png

只需将.jpdl.xml文件传过来，就可以根据这个文件解析出来.png图片

先看节点类的定义:
Java代码
  1. publicclassNode{
  2. privateStringname;
  3. privateStringtype;
  4. privateRectanglerectangle;
  5. privateList<Transition>transitions=newArrayList<Transition>();
  7. publicNode(Stringname,Stringtype){
  8. this.name=name;
  9. this.type=type;
  10. }
  12. publicNode(Stringname,Stringtype,intx,inty,intw,inth){
  13. this.name=name;
  14. this.type=type;
  15. this.rectangle=newRectangle(x,y,w,h);
  16. }
  18. publicRectanglegetRectangle(){
  19. returnrectangle;
  20. }
  22. publicvoidsetRectangle(Rectanglerectangle){
  23. this.rectangle=rectangle;
  24. }
  26. publicStringgetType(){
  27. returntype;
  28. }
  30. publicvoidsetType(Stringtype){
  31. this.type=type;
  32. }
  34. publicStringgetName(){
  35. returnname;
  36. }
  38. publicvoidsetName(Stringname){
  39. this.name=name;
  40. }
  42. publicvoidaddTransition(Transitiontransition){
  43. transitions.add(transition);
  44. }
  46. publicList<Transition>getTransitions(){
  47. returntransitions;
  48. }
  50. publicvoidsetTransitions(List<Transition>transitions){
  51. this.transitions=transitions;
  52. }
  54. publicintgetX(){
  55. returnrectangle.x;
  56. }
  58. publicintgetY(){
  59. returnrectangle.y;
  60. }
  62. publicintgetCenterX(){
  63. return(int)rectangle.getCenterX();
  64. }
  66. publicintgetCenterY(){
  67. return(int)rectangle.getCenterY();
  68. }
  70. publicintgetWitdth(){
  71. returnrectangle.width;
  72. }
  74. publicintgetHeight(){
  75. returnrectangle.height;
  76. }
  77. }


其次是Transition的定义:
Java代码
  1. publicclassTransition{
  2. privatePointlabelPosition;
  3. privateList<Point>lineTrace=newArrayList<Point>();
  4. privateStringlabel;
  5. privateStringto;
  7. publicTransition(Stringlabel,Stringto){
  8. this.label=label;
  9. this.to=to;
  10. }
  12. publicPointgetLabelPosition(){
  13. returnlabelPosition;
  14. }
  16. publicvoidsetLabelPosition(PointlabelPosition){
  17. this.labelPosition=labelPosition;
  18. }
  20. publicList<Point>getLineTrace(){
  21. returnlineTrace;
  22. }
  24. publicvoidsetLineTrace(List<Point>lineTrace){
  25. this.lineTrace=lineTrace;
  26. }
  28. publicvoidaddLineTrace(PointlineTrace){
  29. if(lineTrace!=null){
  30. this.lineTrace.add(lineTrace);
  31. }
  32. }
  34. publicStringgetLabel(){
  35. returnlabel;
  36. }
  37. publicvoidsetLabel(Stringlabel){
  38. this.label=label;
  39. }
  41. publicStringgetTo(){
  42. returnto;
  43. }
  45. publicvoidsetTo(Stringto){
  46. this.to=to;
  47. }
  49. }


类JpdlModel
Java代码
  1. /**
  2. *CopyRight(C)2006-2009yy
  3. *@authoryy
  4. *@projectjbpm
  5. *@version1.0
  6. *@mailyy629_86at163dotcom
  7. *@date2009-9-6下午06:00:14
  8. *@description
  9. */
  10. packagesofocus.bpm.jbpm.jpdl.model;
  12. importjava.awt.Point;
  13. importjava.io.InputStream;
  14. importjava.util.HashMap;
  15. importjava.util.LinkedHashMap;
  16. importjava.util.List;
  17. importjava.util.Map;
  19. importorg.dom4j.Element;
  20. importorg.dom4j.io.SAXReader;
  22. publicclassJpdlModel{
  23. privateMap<String,Node>nodes=newLinkedHashMap<String,Node>();
  24. publicstaticfinalintRECT_OFFSET_X=-7;
  25. publicstaticfinalintRECT_OFFSET_Y=-8;
  26. publicstaticfinalintDEFAULT_PIC_SIZE=48;
  28. privatefinalstaticMap<String,Object>nodeInfos=newHashMap<String,Object>();
  29. static{
  30. nodeInfos.put("start","start_event_empty.png");
  31. nodeInfos.put("end","end_event_terminate.png");
  32. nodeInfos.put("end-cancel","end_event_cancel.png");
  33. nodeInfos.put("end-error","end_event_error.png");
  34. nodeInfos.put("decision","gateway_exclusive.png");
  35. nodeInfos.put("fork","gateway_parallel.png");
  36. nodeInfos.put("join","gateway_parallel.png");
  37. nodeInfos.put("state",null);
  38. nodeInfos.put("hql",null);
  39. nodeInfos.put("sql",null);
  40. nodeInfos.put("java",null);
  41. nodeInfos.put("script",null);
  42. nodeInfos.put("task",null);
  43. nodeInfos.put("sub-process",null);
  44. nodeInfos.put("custom",null);
  45. }
  47. publicJpdlModel(InputStreamis)throwsException{
  48. this(newSAXReader().read(is).getRootElement());
  49. }
  51. @SuppressWarnings("unchecked")
  52. privateJpdlModel(ElementrootEl)throwsException{
  53. for(Elementel:(List<Element>)rootEl.elements()){
  54. Stringtype=el.getQName().getName();
  55. if(!nodeInfos.containsKey(type)){//不是可展示的节点
  56. continue;
  57. }
  58. Stringname=null;
  59. if(el.attribute("name")!=null){
  60. name=el.attributeValue("name");
  61. }
  62. String[]location=el.attributeValue("g").split(",");
  63. intx=Integer.parseInt(location[0]);
  64. inty=Integer.parseInt(location[1]);
  65. intw=Integer.parseInt(location[2]);
  66. inth=Integer.parseInt(location[3]);
  68. if(nodeInfos.get(type)!=null){
  69. w=DEFAULT_PIC_SIZE;
  70. h=DEFAULT_PIC_SIZE;
  71. }else{
  72. x-=RECT_OFFSET_X;
  73. y-=RECT_OFFSET_Y;
  74. w+=(RECT_OFFSET_X+RECT_OFFSET_X);
  75. h+=(RECT_OFFSET_Y+RECT_OFFSET_Y);
  76. }
  77. Nodenode=newNode(name,type,x,h);
  78. parserTransition(node,el);
  79. nodes.put(name,node);
  80. }
  81. }
  83. @SuppressWarnings("unchecked")
  84. privatevoidparserTransition(Nodenode,ElementnodeEl){
  85. for(Elementel:(List<Element>)nodeEl.elements("transition")){
  86. Stringlabel=el.attributeValue("name");
  87. Stringto=el.attributeValue("to");
  88. Transitiontransition=newTransition(label,to);
  89. Stringg=el.attributeValue("g");
  90. if(g!=null&&g.length()>0){
  91. if(g.indexOf(":")<0){
  92. transition.setLabelPosition(getPoint(g));
  93. }else{
  94. String[]p=g.split(":");
  95. transition.setLabelPosition(getPoint(p[1]));
  96. String[]lines=p[0].split(";");
  97. for(Stringline:lines){
  98. transition.addLineTrace(getPoint(line));
  99. }
  100. }
  101. }
  102. node.addTransition(transition);
  103. }
  104. }
  106. privatePointgetPoint(Stringexp){
  107. if(exp==null||exp.length()==0){
  108. returnnull;
  109. }
  110. String[]p=exp.split(",");
  111. returnnewPoint(Integer.valueOf(p[0]),Integer.valueOf(p[1]));
  112. }
  114. publicMap<String,Node>getNodes(){
  115. returnnodes;
  116. }
  117. publicstaticMap<String,Object>getNodeInfos(){
  118. returnnodeInfos;
  119. }
  120. }


根据JpdlModel绘制出流程图
Java代码
  1. /**
  2. *CopyRight(C)2006-2009yy
  3. *@authoryy
  4. *@projectJbpm
  5. *@version1.0
  6. *@mailyy629_86at163dotcom
  7. *@date2009-9-6下午06:00:14
  8. *@description
  9. */
  10. packagesofocus.bpm.jbpm.jpdl;
  12. importjava.awt.*;
  13. importjava.awt.font.FontRenderContext;
  14. importjava.awt.geom.Rectangle2D;
  15. importjava.awt.image.BufferedImage;
  16. importjava.io.IOException;
  17. importjava.util.List;
  18. importjava.util.Map;
  20. importjavax.imageio.ImageIO;
  22. importsofocus.bpm.jbpm.jpdl.model.JpdlModel;
  23. importsofocus.bpm.jbpm.jpdl.model.Node;
  24. importsofocus.bpm.jbpm.jpdl.model.Transition;
  26. /**
  27. *@authoryeyong
  28. *
  29. */
  30. publicclassJpdlModelDrawer{
  31. publicstaticfinalintRECT_OFFSET_X=JpdlModel.RECT_OFFSET_X;
  32. publicstaticfinalintRECT_OFFSET_Y=JpdlModel.RECT_OFFSET_Y;
  33. publicstaticfinalintRECT_ROUND=25;
  35. publicstaticfinalintDEFAULT_FONT_SIZE=12;
  37. publicstaticfinalColorDEFAULT_STROKE_COLOR=Color.decode("#03689A");
  38. publicstaticfinalStrokeDEFAULT_STROKE=newBasicStroke(2);
  40. publicstaticfinalColorDEFAULT_LINE_STROKE_COLOR=Color.decode("#808080");
  41. publicstaticfinalStrokeDEFAULT_LINE_STROKE=newBasicStroke(1);
  43. publicstaticfinalColorDEFAULT_FILL_COLOR=Color.decode("#F6F7FF");
  45. privatefinalstaticMap<String,Object>nodeInfos=JpdlModel.getNodeInfos();
  47. publicBufferedImagedraw(JpdlModeljpdlModel)throwsIOException{
  48. Rectangledimension=getCanvasDimension(jpdlModel);
  49. BufferedImagebi=newBufferedImage(dimension.width,dimension.height,BufferedImage.TYPE_INT_ARGB);
  50. Graphics2Dg2=bi.createGraphics();
  51. g2.setColor(Color.WHITE);
  52. g2.fillRect(0,0,dimension.width,dimension.height);
  53. g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);
  54. Fontfont=newFont("宋体",Font.PLAIN,DEFAULT_FONT_SIZE);
  55. g2.setFont(font);
  56. Map<String,Node>nodes=jpdlModel.getNodes();
  57. drawNode(nodes,g2,font);
  58. drawTransition(nodes,g2);
  59. returnbi;
  60. }
  62. /**
  63. *获得图片的矩形大小
  64. *
  65. *@return
  66. */
  67. privateRectanglegetCanvasDimension(JpdlModeljpdlModel){
  68. Rectanglerectangle=newRectangle();
  69. Rectanglerect;
  70. for(Nodenode:jpdlModel.getNodes().values()){
  71. rect=node.getRectangle();
  72. if(rect.getMaxX()>rectangle.getMaxX()){
  73. rectangle.width=(int)rect.getMaxX();
  74. }
  75. if(rect.getMaxY()>rectangle.getMaxY()){
  76. rectangle.height=(int)rect.getMaxY();
  77. }
  78. for(Transitiontransition:node.getTransitions()){
  79. List<Point>trace=transition.getLineTrace();
  80. for(Pointpoint:trace){
  81. if(rectangle.getMaxX()<point.x){
  82. rectangle.width=point.x;
  83. }
  84. if(rectangle.getMaxY()<point.y){
  85. rectangle.height=point.y;
  86. }
  87. }
  88. }
  89. }
  90. rectangle.width+=60;
  91. rectangle.height+=20;
  92. returnrectangle;
  93. }
  95. /**
  96. *@paramg2
  97. *@throwsIOException
  98. */
  99. privatevoiddrawTransition(Map<String,Node>nodes,Graphics2Dg2)throwsIOException{
  100. g2.setStroke(DEFAULT_LINE_STROKE);
  101. g2.setColor(DEFAULT_LINE_STROKE_COLOR);
  102. for(Nodenode:nodes.values()){
  103. for(Transitiontransition:node.getTransitions()){
  104. Stringto=transition.getTo();
  105. NodetoNode=nodes.get(to);
  106. List<Point>trace=newLinkedList<Point>(transition.getLineTrace());
  107. intlen=trace.size()+2;
  108. trace.add(0,newPoint(node.getCenterX(),node.getCenterY()));
  109. trace.add(newPoint(toNode.getCenterX(),toNode.getCenterY()));
  110. int[]xPoints=newint[len];
  111. int[]yPoints=newint[len];
  112. for(inti=0;i<len;i++){
  113. xPoints[i]=trace.get(i).x;
  114. yPoints[i]=trace.get(i).y;
  115. }
  116. finalinttaskGrow=4;
  117. finalintsmallGrow=-2;
  118. intgrow=0;
  119. if(nodeInfos.get(node.getType())!=null){
  120. grow=smallGrow;
  121. }else{
  122. grow=taskGrow;
  123. }
  124. Pointp=GeometryUtils.getRectangleLineCrossPoint(node.getRectangle(),newPoint(xPoints[1],
  125. yPoints[1]),grow);
  126. if(p!=null){
  127. xPoints[0]=p.x;
  128. yPoints[0]=p.y;
  129. }
  130. if(nodeInfos.get(toNode.getType())!=null){
  131. grow=smallGrow;
  132. }else{
  133. grow=taskGrow;
  134. }
  135. p=GeometryUtils.getRectangleLineCrossPoint(toNode.getRectangle(),newPoint(xPoints[len-2],
  136. yPoints[len-2]),grow);
  137. if(p!=null){
  138. xPoints[len-1]=p.x;
  139. yPoints[len-1]=p.y;
  140. }
  141. g2.drawPolyline(xPoints,yPoints,len);
  142. drawArrow(g2,xPoints[len-2],yPoints[len-2],xPoints[len-1],yPoints[len-1]);
  143. Stringlabel=transition.getLabel();
  144. if(label!=null&&label.length()>0){
  145. intcx,cy;
  146. if(len%2==0){
  147. cx=(xPoints[len/2-1]+xPoints[len/2])/2;
  148. cy=(yPoints[len/2-1]+yPoints[len/2])/2;
  149. }else{
  150. cx=xPoints[len/2];
  151. cy=yPoints[len/2];
  152. }
  153. PointlabelPoint=transition.getLabelPosition();
  154. if(labelPoint!=null){
  155. cx+=labelPoint.x;
  156. cy+=labelPoint.y;
  157. }
  158. cy-=RECT_OFFSET_Y+RECT_OFFSET_Y/2;
  159. g2.drawString(label,cx,cy);
  160. }
  161. }
  162. }
  163. }
  165. privatevoiddrawArrow(Graphics2Dg2,intx1,inty1,intx2,inty2){
  166. finaldoublelen=8.0;
  167. doubleslopy=Math.atan2(y2-y1,x2-x1);
  168. doublecosy=Math.cos(slopy);
  169. doublesiny=Math.sin(slopy);
  170. int[]xPoints={0,x2,0};
  171. int[]yPoints={0,y2,0};
  172. doublea=len*siny,b=len*cosy;
  173. doublec=len/2.0*siny,d=len/2.0*cosy;
  174. xPoints[0]=x2-(int)(b+c);
  175. yPoints[0]=y2-(int)(a-d);
  176. xPoints[2]=x2-(int)(b-c);
  177. yPoints[2]=y2-(int)(d+a);
  179. g2.fillPolygon(xPoints,3);
  180. }
  182. /**
  183. *@paramg2
  184. *@throwsIOException
  185. */
  186. privatevoiddrawNode(Map<String,Graphics2Dg2,Fontfont)throwsIOException{
  187. for(Nodenode:nodes.values()){
  188. Stringname=node.getName();
  189. if(nodeInfos.get(node.getType())!=null){
  190. BufferedImagebi2=ImageIO.read(getClass().getResourceAsStream(
  191. "/icons/48/"+nodeInfos.get(node.getType())));
  192. g2.drawImage(bi2,node.getX(),node.getY(),null);
  193. }else{
  194. intx=node.getX();
  195. inty=node.getY();
  196. intw=node.getWitdth();
  197. inth=node.getHeight();
  198. g2.setColor(DEFAULT_FILL_COLOR);
  199. g2.fillRoundRect(x,h,RECT_ROUND,RECT_ROUND);
  200. g2.setColor(DEFAULT_STROKE_COLOR);
  201. g2.setStroke(DEFAULT_STROKE);
  202. g2.drawRoundRect(x,RECT_ROUND);
  204. FontRenderContextfrc=g2.getFontRenderContext();
  205. Rectangle2Dr2=font.getStringBounds(name,frc);
  206. intxLabel=(int)(node.getX()+((node.getWitdth()-r2.getWidth())/2));
  207. intyLabel=(int)((node.getY()+((node.getHeight()-r2.getHeight())/2))-r2.getY());
  208. g2.setStroke(DEFAULT_LINE_STROKE);
  209. g2.setColor(Color.black);
  210. g2.drawString(name,xLabel,yLabel);
  211. }
  212. }
  213. }
  214. }


工具类,用来计算一些坐标的
Java代码
  1. /**
  2. *CopyRight(C)2006-2009yy
  3. *@authoryy
  4. *@projectjbpm
  5. *@version1.0
  6. *@mailyy629_86at163dotcom
  7. *@date2009-9-11上午06:16:26
  8. *@description
  9. */
  10. packagesofocus.bpm.jbpm.jpdl;
  12. importjava.awt.Point;
  13. importjava.awt.Rectangle;
  15. /**
  16. *@authoryeyong
  17. *
  18. */
  19. publicclassGeometryUtils{
  20. /**
  21. *获得直线(x1,y1)-(x2,y2)的斜率
  22. *
  23. *@paramx1
  24. *@paramy1
  25. *@paramx2
  26. *@paramy2
  27. *@return
  28. */
  29. publicstaticdoublegetSlope(intx1,inty2){
  30. return((double)y2-y1)/(x2-x1);
  31. }
  33. /**
  34. *获得直线(x1,y2)的y轴截距
  35. *
  36. *@paramx1
  37. *@paramy1
  38. *@paramx2
  39. *@paramy2
  40. *@return
  41. */
  42. publicstaticdoublegetYIntercep(intx1,inty2){
  43. returny1-x1*getSlope(x1,y1,y2);
  44. }
  45. /**
  46. *获得矩形的中点
  47. *
  48. *@paramrect
  49. *@return
  50. */
  51. publicstaticPointgetRectangleCenter(Rectanglerect){
  52. returnnewPoint((int)rect.getCenterX(),(int)rect.getCenterY());
  53. }
  55. /**
  56. *获得矩形中心p0与p1的线段和矩形的交点
  57. *
  58. *@paramrectangle
  59. *@paramp1
  60. *@return
  61. */
  62. publicstaticPointgetRectangleLineCrossPoint(Rectanglerectangle,Pointp1,intgrow){
  63. Rectanglerect=rectangle.getBounds();
  64. rect.grow(grow,grow);
  65. Pointp0=GeometryUtils.getRectangleCenter(rect);
  67. if(p1.x==p0.x){
  68. if(p1.y<p0.y){
  69. returnnewPoint(p0.x,rect.y);
  70. }
  71. returnnewPoint(p0.x,rect.y+rect.height);
  72. }
  74. if(p1.y==p0.y){
  75. if(p1.x<p0.x){
  76. returnnewPoint(rect.x,p0.y);
  77. }
  78. returnnewPoint(rect.x+rect.width,p0.y);
  79. }
  81. doubleslope=GeometryUtils.getSlope(p0.x,p0.y,rect.x,rect.y);
  82. doubleslopeLine=GeometryUtils.getSlope(p0.x,p1.x,p1.y);
  83. doubleyIntercep=GeometryUtils.getYIntercep(p0.x,p1.y);
  85. if(Math.abs(slopeLine)>slope-1e-2){
  86. if(p1.y<rect.y){
  87. returnnewPoint((int)((rect.y-yIntercep)/slopeLine),rect.y);
  88. }else{
  89. returnnewPoint((int)((rect.y+rect.height-yIntercep)/slopeLine),rect.y+rect.height);
  90. }
  91. }
  92. if(p1.x<rect.x){
  93. returnnewPoint(rect.x,(int)(slopeLine*rect.x+yIntercep));
  94. }else{
  95. returnnewPoint(rect.x+rect.width,(int)(slopeLine*(rect.x+rect.width)+yIntercep));
  96. }
  97. }
  98. }


测试
Java代码

public static void main(String[] args) { // TODO Auto-generated method stub try { File file = new File("D:/test.jpdl.xml"); InputStream is = new FileInputStream(file); JpdlModel jpdlModel = new JpdlModel (is); ImageIO.write(new JpdlModelDrawer().draw(jpdlModel),"png",new File("D:/test.png")); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); }

}

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