将GraphViz.java中的这一路径改成你电脑上的路径，基本上就可以用了。
package Graphoutput
// GraphViz.java - a simple API to call dot from Java programs
/*$Id$*/
/*
******************************************************************************
**
* (c) Copyright 2003 Laszlo Szathmary *
**
* This program is free softwareyou can redistribute it and/or modify it*
* under the terms of the GNU Lesser General Public License as published by *
* the Free Software Foundationeither version 2.1 of the License, or*
* (at your option) any later version.*
**
* This program is distributed in the hope that it will be useful, but*
* WITHOUT ANY WARRANTYwithout even the implied warranty of MERCHANTABILITY *
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public*
* License for more details. *
**
* You should have received a copy of the GNU Lesser General Public License *
* along with this programif not, write to the Free Software Foundation,*
* Inc., 675 Mass Ave, Cambridge, MA 02139, USA. *
**
******************************************************************************
*/
import java.io.BufferedReader
import java.io.DataInputStream
import java.io.File
import java.io.FileInputStream
import java.io.FileOutputStream
import java.io.FileWriter
import java.io.InputStreamReader
/**
* <dl>
* <dt>Purpose: GraphViz Java API
* <dd>
*
* <dt>Description:
* <dd>With this Java class you can simply call dot
* from your Java programs
* <dt>Example usage:
* <dd>
* <pre>
*GraphViz gv = new GraphViz()
*gv.addln(gv.start_graph())
*gv.addln("A ->B")
*gv.addln("A ->C")
*gv.addln(gv.end_graph())
*System.out.println(gv.getDotSource())
*
*String type = "gif"
*File out = new File("out." + type) // out.gif in this example
*gv.writeGraphToFile( gv.getGraph( gv.getDotSource(), type ), out )
* </pre>
* </dd>
*
* </dl>
*
* @version v0.4, 2011/02/05 (February) -- Patch of Keheliya Gallaba is added. Now you
* can specify the type of the output file: gif, dot, fig, pdf, ps, svg, png, etc.
* @version v0.3, 2010/11/29 (November) -- Windows support + ability
* to read the graph from a text file
* @version v0.2, 2010/07/22 (July) -- bug fix
* @version v0.1, 2003/12/04 (December) -- first release
* @author Laszlo Szathmary (<a href="jabba.laci@gmail.com">jabba.laci@gmail.com</a>)
*/
public class GraphViz
{
/**
* The dir. where temporary files will be created.
*/
//private static String TEMP_DIR = "/tmp"// Linux
private static String TEMP_DIR = "c:/temp"// Windows
/**
* Where is your dot program located? It will be called externally.
*/
// private static String DOT = "/usr/bin/dot"// Linux
private static String DOT = "D:\\Program Files\\Graphviz2.30\\bin\\dot.exe"// Windows
/**
* The source of the graph written in dot language.
*/
private StringBuilder graph = new StringBuilder()
/**
* Constructor: creates a new GraphViz object that will contain
* a graph.
*/
public GraphViz() {
}
/**
* Returns the graph's source description in dot language.
* @return Source of the graph in dot language.
*/
public String getDotSource() {
return graph.toString()
}
/**
* Adds a string to the graph's source (without newline).
*/
public void add(String line) {
graph.append(line)
}
/**
* Adds a string to the graph's source (with newline).
*/
public void addln(String line) {
graph.append(line + "\n")
}
/**
* Adds a newline to the graph's source.
*/
public void addln() {
graph.append('\n')
}
/**
* Returns the graph as an image in binary format.
* @param dot_source Source of the graph to be drawn.
* @param type Type of the output image to be produced, e.g.: gif, dot, fig, pdf, ps, svg, png.
* @return A byte array containing the image of the graph.
*/
public byte[] getGraph(String dot_source, String type)
{
File dot
byte[] img_stream = null
try {
dot = writeDotSourceToFile(dot_source)
if (dot != null)
{
img_stream = get_img_stream(dot, type)
if (dot.delete() == false)
System.err.println("Warning: " + dot.getAbsolutePath() + " could not be deleted!")
return img_stream
}
return null
} catch (java.io.IOException ioe) { return null}
}
/**
* Writes the graph's image in a file.
* @param img A byte array containing the image of the graph.
* @param file Name of the file to where we want to write.
* @return Success: 1, Failure: -1
*/
public int writeGraphToFile(byte[] img, String file)
{
File to = new File(file)
return writeGraphToFile(img, to)
}
/**
* Writes the graph's image in a file.
* @param img A byte array containing the image of the graph.
* @param toA File object to where we want to write.
* @return Success: 1, Failure: -1
*/
public int writeGraphToFile(byte[] img, File to)
{
try {
FileOutputStream fos = new FileOutputStream(to)
fos.write(img)
fos.close()
} catch (java.io.IOException ioe) { ioe.printStackTrace()return -1}
return 1
}
/**
* It will call the external dot program, and return the image in
* binary format.
* @param dot Source of the graph (in dot language).
* @param type Type of the output image to be produced, e.g.: gif, dot, fig, pdf, ps, svg, png.
* @return The image of the graph in .gif format.
*/
private byte[] get_img_stream(File dot, String type)
{
File img
byte[] img_stream = null
try {
img = File.createTempFile("graph_", "."+type, new File(GraphViz.TEMP_DIR))
Runtime rt = Runtime.getRuntime()
// patch by Mike Chenault
String[] args = {DOT, "-T"+type, dot.getAbsolutePath(), "-o", img.getAbsolutePath()}
Process p = rt.exec(args)
p.waitFor()
FileInputStream in = new FileInputStream(img.getAbsolutePath())
img_stream = new byte[in.available()]
in.read(img_stream)
// Close it if we need to
if( in != null ) in.close()
if (img.delete() == false)
System.err.println("Warning: " + img.getAbsolutePath() + " could not be deleted!")
}
catch (java.io.IOException ioe) {
System.err.println("Error:in I/O processing of tempfile in dir " + GraphViz.TEMP_DIR+"\n")
System.err.println(" or in calling external command")
ioe.printStackTrace()
}
catch (java.lang.InterruptedException ie) {
System.err.println("Error: the execution of the external program was interrupted")
ie.printStackTrace()
}
return img_stream }
/**
* Writes the source of the graph in a file, and returns the written file
* as a File object.
* @param str Source of the graph (in dot language).
* @return The file (as a File object) that contains the source of the graph.
*/
public File writeDotSourceToFile(String str) throws java.io.IOException
{
File temp
try {
temp = File.createTempFile("graph_", ".dot.tmp", new File(GraphViz.TEMP_DIR))
FileWriter fout = new FileWriter(temp)
fout.write(str)
fout.close()
}
catch (Exception e) {
System.err.println("Error: I/O error while writing the dot source to temp file!")
return null
}
return temp
}
/**
* Returns a string that is used to start a graph.
* @return A string to open a graph.
*/
public String start_graph() {
return "digraph G {"
}
/**
* Returns a string that is used to end a graph.
* @return A string to close a graph.
*/
public String end_graph() {
return "}"
}
/**
* Read a DOT graph from a text file.
*
* @param input Input text file containing the DOT graph
* source.
*/
public void readSource(String input)
{
StringBuilder sb = new StringBuilder()
try
{
FileInputStream fis = new FileInputStream(input)
DataInputStream dis = new DataInputStream(fis)
BufferedReader br = new BufferedReader(new InputStreamReader(dis))
String line
while ((line = br.readLine()) != null) {
sb.append(line)
}
dis.close()
}
catch (Exception e) {
System.err.println("Error: " + e.getMessage())
}
this.graph = sb
}
} // end of class GraphViz
通过下面这个类调用graphViz.java
import java.io.File
public class Proba
{
public static void main(String[] args)
{
Proba p = new Proba()
p.start()
// p.start2()
}
/**
* Construct a DOT graph in memory, convert it
* to image and store the image in the file system.
*/
private void start()
{
GraphViz gv = new GraphViz()
gv.addln(gv.start_graph())
gv.addln("A ->B")
gv.addln("A ->C")
gv.addln(gv.end_graph())
System.out.println(gv.getDotSource())
String type = "gif"
// String type = "dot"
// String type = "fig" // open with xfig
// String type = "pdf"
// String type = "ps"
// String type = "svg" // open with inkscape
// String type = "png"
// String type = "plain"
File out = new File("/tmp/out." + type) // Linux
// File out = new File("c:/eclipse.ws/graphviz-java-api/out." + type) // Windows
gv.writeGraphToFile( gv.getGraph( gv.getDotSource(), type ), out )
}
/**
* Read the DOT source from a file,
* convert to image and store the image in the file system.
*/
private void start2()
{
// String dir = "/home/jabba/eclipse2/laszlo.sajat/graphviz-java-api"// Linux
// String input = dir + "/sample/simple.dot"
String input = "c:/eclipse.ws/graphviz-java-api/sample/simple.dot" // Windows
GraphViz gv = new GraphViz()
gv.readSource(input)
System.out.println(gv.getDotSource())
String type = "gif"
//String type = "dot"
//String type = "fig" // open with xfig
//String type = "pdf"
//String type = "ps"
//String type = "svg" // open with inkscape
//String type = "png"
// String type = "plain"
File out = new File("/tmp/simple." + type) // Linux
//File out = new File("c:/eclipse.ws/graphviz-java-api/tmp/simple." + type) // Windows
gv.writeGraphToFile( gv.getGraph( gv.getDotSource(), type ), out )
}
}
1.1）下载安装文件从graphviz官网下载http://www.graphviz.org/Download.php或者从我的百度网盘下载下载后双击安装，跟着提示安装即可1.2）安装后可能在桌面没有graphviz的快捷方式，不过不用担心，在我们的开始菜单里面可以找到。开始->所有程序->Grapgviz->gvedit.exe。打开后是如下的一个简单界面（忽略界面上的那只苍蝇~）
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