相关的功能也可以使用jts.jar包实现

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.sql.Statement;

import org.junit.Before;

import org.junit.Test;

import org.postgresql.geometric.PGcircle;

import org.postgresql.geometric.PGpoint;

public class GeometricTest {

private Connection conn;

@Before

public void init() throws Exception {

Class.forName("org.postgresql.Driver");

String url = "jdbc:postgresql://localhost:5432/postgis";

conn = DriverManager.getConnection(url, "username", "password");

Statement stmt = conn.createStatement();

stmt.execute("CREATE TEMP TABLE geomtest(mycirc circle)");

stmt.close();

}

public void destroy() throws SQLException {

if (conn != null) {

conn.close();

}

}

@Test

public void insertCircle() throws SQLException {

PGpoint center = new PGpoint(1, 2.5);

// PGpolygon polygon = new PGpolygon(points);

double radius = 4;

PGcircle circle = new PGcircle(center, radius);

PreparedStatement ps = conn.prepareStatement("INSERT INTO geomtest(mycirc) VALUES (?)");

ps.setObject(1, circle);

ps.executeUpdate();

ps.close();

}

@Test

public void retrieveCircle() throws SQLException {

Statement stmt = conn.createStatement();

ResultSet rs = stmt.executeQuery("SELECT mycirc, area(mycirc) FROM geomtest");

rs.next();

PGcircle circle = (PGcircle) rs.getObject(1);

double area = rs.getDouble(2);

// PG

PGpoint center = circle.center;

double radius = circle.radius;

System.out.println("Center (X, Y) = (" + center.x + ", " + center.y + ")");

System.out.println("Radius = " + radius);

System.out.println("Area = " + area);

}

@Test

public void getWKTFromGEOM() throws SQLException {

Statement stmt = conn.createStatement();

ResultSet rs = stmt.executeQuery("SELECT ST_AsText(geom) FROM sheng where name = '新疆维吾尔自治区'");

rs.next();

String wkt = rs.getString(1);

System.out.println(wkt);

}

@Test

public void getWKBFromGEOM() throws SQLException {

Statement stmt = conn.createStatement();

ResultSet rs = stmt.executeQuery("SELECT ST_AsBinary(geom) FROM sheng");

rs.next();

String wkt = rs.getString(1);

System.out.println("wkt = " + wkt);

}

@Test

public void getEWKTFromGEOM() throws SQLException {

Statement stmt = conn.createStatement();

ResultSet rs = stmt.executeQuery("SELECT ST_AsEWKT(geom) FROM sheng");

rs.next();

String wkt = rs.getString(1);

System.out.println("wkt = " + wkt);

}

@Test

public void getBufferFromGEOM() throws SQLException {

Statement stmt = conn.createStatement();

ResultSet rs = stmt.executeQuery("SELECT ST_AsEWKT(ST_Buffer(geom, 0.2)), ST_AsEWKT(geom) FROM sheng where id = 1");

rs.next();

String wkt = rs.getString(1);

String wkt2 = rs.getString(2);

//System.out.println("tt " + wkt.substring(0, 100));

//System.out.println("tt " + wkt2.substring(0, 100));

}

/**

* 需要在postGis中模拟一个dual表(注意指明空间字段)

*/

@Test

public void getBufferFromWKT() throws SQLException {

// 新疆维吾尔自治区

String wkt = PropertiesUtility.getInstance().findFileValue("system.properties", "wkt");

long startTime = new java.util.Date().getTime();

System.out.println(startTime);

String sql = "SELECT ST_AsText(ST_Buffer(st_geomfromtext('" + wkt + "'), 0.2)) FROM dual";

Statement stmt = conn.createStatement();

ResultSet rs = stmt.executeQuery(sql);

rs.next();

long endTime = new java.util.Date().getTime();

System.out.println(endTime);

System.out.println("缓冲时间：" + (endTime - startTime));

System.out.println("坐标点数：" + wkt.split(",").length);

}

/**

* 根据指定的缓冲距离进行缓冲，以米为单位

*/

@Test

public void getBufferFromWKT2() throws SQLException {

// 新疆维吾尔自治区 wkt=MULTIPOLYGON(((79.036744 34.3364.............

String wkt = PropertiesUtility.getInstance().findFileValue("system.properties", "wkt");

long startTime = new java.util.Date().getTime();

System.out.println(startTime);

// 缓冲距离为10.8KM

String sql = "SELECT ST_AsText(st_transform(st_setsrid(ST_Buffer(st_transform(st_setsrid(st_geomfromtext('" + wkt

+ "'), 4326), 2333), 10800), 2333), 4326)) FROM dual";

Statement stmt = conn.createStatement();

ResultSet rs = stmt.executeQuery(sql);

rs.next();

String resultWKT = rs.getString(1);

System.out.println(resultWKT);

long endTime = new java.util.Date().getTime();

System.out.println(endTime);

System.out.println("缓冲时间：" + (endTime - startTime));

System.out.println("坐标点数：" + wkt.split(",").length);

}

// 判断点是否在多边形内

@Test

public void getWithin() throws SQLException {

Statement stmt = conn.createStatement();

String sql = "SELECT name FROM sheng where ST_Within(ST_MakePoint(116.561, 40.276), geom)";

ResultSet rs = stmt.executeQuery(sql);

while (rs.next()) {

String wkt = rs.getString(1);

System.out.println(wkt);

}

}

}