Java中使用JTS实现WKB数据写入、转换字符串、读取

怼烎@ 2024-02-05 18:06 41阅读 0赞

## 场景 ##

Java中使用JTS实现WKT字符串读取转换线、查找LineString的list中距离最近的线、LineString做缓冲区扩展并计算点在缓冲区内的方位角：

[Java中使用JTS实现WKT字符串读取转换线、查找LineString的list中距离最近的线、LineString做缓冲区扩展并计算点在缓冲区内的方位角\_jts工具类-CSDN博客][Java_JTS_WKT_LineString_list_LineString_jts_-CSDN]

### WKB介绍 ###

WKB(Well-Known Binary) 用二进制流 描述几何对象信息。

WKB比WKT的优势在于WKB是二进制,主要是解决传输和存储的效率问题，

所以MySQL,Postgre数据存储Geometry类型的数据，存储的值是WKB格式的

WKB 使用 1 字节无符号整数、4 字节无符号整数和 8 字节双精度数（IEEE 754 格式）。一个字节是八位。

Mysql中查询存储WKB值示例：

SELECT hex(st_asbinary(st_geomfromtext('POINT(1 2)')))

![0201a5f751a242fa945a45eb99e5cf5a.png][]

注：

博客：  
[霸道流氓气质\_C\#,架构之路,SpringBoot-CSDN博客][C_SpringBoot-CSDN]

## 实现 ##

1、WKB相关操作api

![ed4f743a70484824918fabc19fceea82.png][]

2、WKB输出数据并转换为字符串

GeometryFactory geometryFactory = new GeometryFactory();
            Point point1 = geometryFactory.createPoint(new Coordinate(112.11,2225.21));
            WKBWriter wkbWriter = new WKBWriter();
            byte[] write = wkbWriter.write(point1);
    
            String hex = WKBWriter.toHex(write);
            System.out.println(hex);

以上结果输出：

0000000001405C070A3D70A3D740A1626B851EB852

3、WKB数据读取

WKBReader wkbReader = new WKBReader();
            Geometry geometry = null;
            try {
                geometry = wkbReader.read(write);
            } catch (ParseException e) {
                e.printStackTrace();
            }
            System.out.println(geometry.toText());

完整示例：

//WKB输出数据
            GeometryFactory geometryFactory = new GeometryFactory();
            Point point1 = geometryFactory.createPoint(new Coordinate(112.11,2225.21));
            WKBWriter wkbWriter = new WKBWriter();
            byte[] write = wkbWriter.write(point1);
    
            String hex = WKBWriter.toHex(write);
            System.out.println(hex);
            //0000000001405C070A3D70A3D740A1626B851EB852
    
            WKBReader wkbReader = new WKBReader();
            Geometry geometry = null;
            try {
                geometry = wkbReader.read(write);
            } catch (ParseException e) {
                e.printStackTrace();
            }
            System.out.println(geometry.toText());
            //POINT (112.11 2225.21)

##     ##

[Java_JTS_WKT_LineString_list_LineString_jts_-CSDN]: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/132755202
[0201a5f751a242fa945a45eb99e5cf5a.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/af525526fe8d4dda9dd6fce1ca45f441.png
[C_SpringBoot-CSDN]: https://blog.csdn.net/badao_liumang_qizhi
[ed4f743a70484824918fabc19fceea82.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/01/30/69b1ec6dd1494f4398b40eee73a2cdfb.png