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Shapefile格式文件解析和显示

news 2025/2/11 9:00:16

Java实现GIS SHP文件格式的解析和显示，JDK19下编译，awt图形系统显示。

SHP文件对应的属性存储在DBF格式数据库中，解析见：DBASE DBF数据库文件解析_数据库文件在线解析-CSDN博客

解析SHP文件代码：

	public static Shapefile parse(String file) throws IOException {byte _bytes[] = Files.readAllBytes(Paths.get(file));	// 读取文件内容BinaryBufferArray bis = new BinaryBufferArray(_bytes, ByteOrder.BIG_ENDIAN); // 设置大端模式ShapefileImpl shp = new ShapefileImpl();shp.magic = bis.ReadUInt32();	// 读取标志bis.ReadInt32();bis.ReadInt32();bis.ReadInt32();bis.ReadInt32();bis.ReadInt32();shp.length = bis.ReadUInt32();	// 读取长度bis.SetByteOrder(ByteOrder.LITTLE_ENDIAN); // 切换小端模式shp.version = bis.ReadUInt32();	// 读取版本号shp.type = bis.ReadInt32();shp.mbr = bis.ReadDouble(4);shp.z = bis.ReadDouble(2);shp.m = bis.ReadDouble(2);while (bis.available() > 0) {bis.SetByteOrder(ByteOrder.BIG_ENDIAN); // 切换大端模式int gno = bis.ReadInt32();long glen = bis.ReadUInt32();	// 按16-bit word为1个内容长度，这样内容长度是16bit为单位计算的bis.SetByteOrder(ByteOrder.LITTLE_ENDIAN); 	// 切换小端模式long gtype = bis.ReadUInt32();	// 图形类型if (gtype == 5) {  // Polygon	// 测试文件仅有多边形，程序只实现了多边形double[] box = bis.ReadDouble(4);int NumParts = bis.ReadInt32();	int NumPoints = bis.ReadInt32();int[] Parts = bis.ReadInt32(NumParts);ArrayList<SHPPolygon> ps = new ArrayList<>();	// 多边形存储列表for (int i=0; i<NumParts; i++) {int n =  (i==NumParts-1 ? NumPoints- Parts[i] : Parts[i+1] - Parts[i] );SHPPoint[] _points = new SHPPoint[n];for (int j=0;j<n;j++)_points[j] = new SHPPoint(bis.ReadDouble(), bis.ReadDouble());SHPPolygon p = new SHPPolygon(_points);ps.add(p);}SHPPolygonArray p = new SHPPolygonArray(gno, box, ps);shp.geos.add(p);}else throw new java.lang.UnsupportedOperationException("" + gtype);}return shp;}

使用AWT显示世界地图绘制结果，未采用双缓冲模式有闪烁，当鼠标移动时在状态栏显示国家地名属性，从DBF文件解析获得