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📄 shapefilereader.htm

📁 用java编写的读取shapefile的源程序
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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    align=center><STRONG><!--list-->ShapefileReader.java(源码故乡)</STRONG></P></TD></TR>
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      <P align=left><IMG src="ShapeFileReader.files/1.gif"> 随便说说 </P></TD></TR>
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      <P align=left>ShapefileReader.java(源码故乡)</P></TD></TR>
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      <P align=left><BR>import java.awt.Color;<BR>import java.io.*;<BR>import 
      java.net.URL;<BR>import java.net.URLConnection;<BR>import 
      java.util.zip.*;<BR>import 
      uk.ac.leeds.ccg.dbffile.DbfFileException;<BR>import 
      uk.ac.leeds.ccg.dbffile.DbfNet;<BR>import 
      uk.ac.leeds.ccg.shapefile.*;<BR><BR>public class 
      ShapefileReader<BR>{<BR>public Shapefile sf;<BR>public DbfNet 
      dbf;<BR>private int idCol;<BR>private String name;<BR><BR>public 
      ShapefileReader(String baseFilename)<BR>{<BR>super();<BR>sf = null;<BR>dbf 
      = null;<BR>idCol = 3;<BR>name = "none";<BR>name = 
      baseFilename;<BR>try<BR>{<BR>sf = new Shapefile(baseFilename + 
      ".shp");<BR>}<BR>catch(Exception 
      e)<BR>{<BR>System.out.println(e);<BR>}<BR>}<BR><BR>public 
      ShapefileReader(URL base, int idCol)<BR>{<BR>super();<BR>sf = null;<BR>dbf 
      = null;<BR>this.idCol = 3;<BR>name = "none";<BR>this.idCol = 
      idCol;<BR>name = base.getFile();<BR>String sub = 
      "";<BR>if(name.indexOf(63) &gt;= 0)<BR>sub = 
      name.substring(name.indexOf(63), 
      name.lastIndexOf(47));<BR>System.out.println("Sub " + sub);<BR>boolean 
      shpZip = false;<BR>boolean dbfZip = 
      false;<BR>try<BR>{<BR>System.out.println("SFR: Looking for .zip version of 
      " + name);<BR>String ext = ".zip";<BR>String noExt = 
      base.getFile();<BR>System.out.println("No Ext " + 
      noExt);<BR>if(noExt.toLowerCase().endsWith(".shp") 
      noExt.toLowerCase().endsWith(".zip"))<BR>noExt = name.substring(0, 
      name.length() - 4);<BR>System.out.println("No Ext " + noExt);<BR>URL 
      zipURL = new URL(base.getProtocol(), base.getHost(), base.getPort(), noExt 
      + ext);<BR>System.out.println("zip url = " + zipURL);<BR>URLConnection uc 
      = 
      zipURL.openConnection();<BR>uc.setUseCaches(false);<BR>uc.setDefaultUseCaches(false);<BR>System.out.println("Opening 
      zis");<BR>int size = uc.getContentLength();<BR>if(size != -1)<BR>{<BR>byte 
      buf1[] = new byte[size];<BR>byte got[] = new byte[size / 
      10];<BR>InputStream is = uc.getInputStream();<BR>int grab = 0;<BR>for(int 
      total = 0; (grab = is.read(got)) &gt; -1; total += 
      grab)<BR>System.arraycopy(got, 0, buf1, total, grab);<BR><BR>got = 
      null;<BR>ByteArrayInputStream zipfile = new 
      ByteArrayInputStream(buf1);<BR>ZipInputStream zis = new 
      ZipInputStream(zipfile);<BR>System.out.println("Looking for 
      entries");<BR>ZipEntry ze;<BR>while((ze = zis.getNextEntry()) != null 
      &amp;&amp; (!shpZip !dbfZip)) <BR>{<BR>System.out.println("Found 
      entry");<BR>System.out.println(ze);<BR>System.out.println("Entry: " + 
      ze.getName());<BR>System.out.println("Getting 
      entry");<BR>if(ze.getName().toLowerCase().endsWith(".shp"))<BR>{<BR>name = 
      ze.getName();<BR>System.out.println("Found .shp in zip file");<BR>size = 
      (int)ze.getSize();<BR>byte buf[] = new byte[size];<BR>byte in[] = new 
      byte[size];<BR>int n = 0;<BR>for(int index = 0; (n = zis.read(in)) &gt; 
      -1; index += n)<BR>System.arraycopy(in, 0, buf, index, 
      n);<BR><BR>zis.closeEntry();<BR>ByteArrayInputStream bais = new 
      ByteArrayInputStream(buf);<BR>sf = new Shapefile(bais);<BR>shpZip = 
      true;<BR>}<BR>else<BR>if(ze.getName().toLowerCase().endsWith(".dbf"))<BR>{<BR>System.out.println("Found 
      .dbf in zip file");<BR>size = (int)ze.getSize();<BR>byte buf[] = new 
      byte[size];<BR>byte in[] = new byte[size];<BR>int n;<BR>for(int index = 0; 
      (n = zis.read(in)) &gt; -1; index += n)<BR>System.arraycopy(in, 0, buf, 
      index, n);<BR><BR>zis.closeEntry();<BR>ByteArrayInputStream bais = new 
      ByteArrayInputStream(buf);<BR>dbf = new DbfNet(bais);<BR>dbfZip = 
      true;<BR>}<BR>}<BR><BR>if(shpZip &amp;&amp; 
      dbfZip)<BR>{<BR>System.out.println("Zip file version used " + 
      name);<BR>return;<BR>}<BR>}<BR>}<BR>catch(ZipException
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