jbpm4.4根据.jpdl.xml流程定义文件,得到流程图.png

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(); }

}