package org.sxkj.gd.config;
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import org.apache.ibatis.type.BaseTypeHandler;
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import org.apache.ibatis.type.JdbcType;
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import org.apache.ibatis.type.MappedJdbcTypes;
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import org.apache.ibatis.type.MappedTypes;
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import org.locationtech.jts.geom.Geometry;
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import org.locationtech.jts.geom.GeometryFactory;
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import org.locationtech.jts.geom.PrecisionModel;
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import org.locationtech.jts.io.*;
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import java.io.ByteArrayOutputStream;
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import java.io.InputStream;
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import java.sql.CallableStatement;
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import java.sql.PreparedStatement;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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@MappedTypes({String.class})
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@MappedJdbcTypes({JdbcType.OTHER})
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public class GeometryTypeHandler extends BaseTypeHandler<String> {
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@Override
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public void setNonNullParameter(PreparedStatement preparedStatement, int i, String s, JdbcType jdbcType) throws SQLException {
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Geometry geo = null;
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try {
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// String转Geometry
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geo = new WKTReader(new GeometryFactory(new PrecisionModel())).read(s);
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// Geometry转WKB
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byte[] geometryBytes = new WKBWriter(2, ByteOrderValues.LITTLE_ENDIAN, false).write(geo);
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// 设置SRID为mysql默认的 0
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byte[] wkb = new byte[geometryBytes.length + 4];
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wkb[0] = wkb[1] = wkb[2] = wkb[3] = 0;
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System.arraycopy(geometryBytes, 0, wkb, 4, geometryBytes.length);
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preparedStatement.setBytes(i, wkb);
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} catch (ParseException e) {
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}
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}
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@Override
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public String getNullableResult(ResultSet resultSet, String s) {
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try (InputStream inputStream = resultSet.getBinaryStream(s)) {
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Geometry geo = getGeometryFromInputStream(inputStream);
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if (geo != null) {
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return geo.toString();
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}
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} catch (Exception e) {
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}
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return null;
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}
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@Override
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public String getNullableResult(ResultSet resultSet, int i) {
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try (InputStream inputStream = resultSet.getBinaryStream(i)) {
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Geometry geo = getGeometryFromInputStream(inputStream);
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if (geo != null) {
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return geo.toString();
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}
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} catch (Exception e) {
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}
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return null;
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}
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@Override
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public String getNullableResult(CallableStatement callableStatement, int i) throws SQLException {
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return "";
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}
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/**
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* 流 转 geometry
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*/
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private Geometry getGeometryFromInputStream(InputStream inputStream) throws Exception {
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Geometry dbGeometry = null;
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if (inputStream != null) {
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// 二进制流转成字节数组
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byte[] buffer = new byte[255];
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int bytesRead = 0;
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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while ((bytesRead = inputStream.read(buffer)) != -1) {
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baos.write(buffer, 0, bytesRead);
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}
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// 得到字节数组
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byte[] geometryAsBytes = baos.toByteArray();
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// 字节数组小于5 异常
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if (geometryAsBytes.length < 5) {
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}
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// 字节数组前4个字节表示srid 去掉
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byte[] sridBytes = new byte[4];
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System.arraycopy(geometryAsBytes, 0, sridBytes, 0, 4);
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boolean bigEndian = (geometryAsBytes[4] == 0x00);
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// 解析srid
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int srid = 0;
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if (bigEndian) {
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for (int i = 0; i < sridBytes.length; i++) {
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srid = (srid << 8) + (sridBytes[i] & 0xff);
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}
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} else {
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for (int i = 0; i < sridBytes.length; i++) {
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srid += (sridBytes[i] & 0xff) << (8 * i);
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}
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}
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WKBReader wkbReader = new WKBReader();
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// WKBReader 把字节数组转成geometry对象。
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byte[] wkb = new byte[geometryAsBytes.length - 4];
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System.arraycopy(geometryAsBytes, 4, wkb, 0, wkb.length);
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dbGeometry = wkbReader.read(wkb);
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dbGeometry.setSRID(srid);
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}
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return dbGeometry;
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}
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}
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