先看下JAVA用geotools读取shape格式文件
Shapefile属于一种矢量图形格式，它能够保存几何图形的位置及相关属性。但这种格式没法存储地理数据的拓扑信息。
其中，要组成一个Shapefile，有三个文件是必不可少的，它们分别是".shp", ".shx"与 ".dbf"文件
- .shp— 图形格式，用于保存元素的几何实体。
- .shx— 图形索引格式。几何体位置索引，记录每一个几何体在shp文件之中的位置，能够加快向前或向后搜索一个几何体的效率。
- .dbf— 属性数据格式，以dBase IV的数据表格式存储每个几何形状的属性数据。
下面将介绍如何通过Java读取Shape文件中的内容信息
我们的pom文件
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<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.herbert.geotool</groupId> <artifactId>geo</artifactId> <version>1.0-SNAPSHOT</version> <dependencies> <dependency> <groupId>org.geotools</groupId> <artifactId>gt-shapefile</artifactId> <version>19.2</version> <scope>system</scope> </dependency> <dependency> <groupId>org.geotools</groupId> <artifactId>gt-opengis</artifactId> <version>19.2</version> </dependency> <dependency> <groupId>org.geotools</groupId> <artifactId>gt-data</artifactId> <version>19.2</version> </dependency> <dependency> <groupId>org.geotools</groupId> <artifactId>gt-api</artifactId> <version>19.2</version> </dependency> <dependency> <groupId>org.geotools</groupId> <artifactId>gt-main</artifactId> <version>19.2</version> </dependency> <dependency> <groupId>org.geotools</groupId> <artifactId>gt-metadata</artifactId> <version>19.2</version> </dependency> <dependency> <groupId>org.geotools</groupId> <artifactId>gt-referencing</artifactId> <version>19.2</version> </dependency> <dependency> <groupId>org.geotools</groupId> <artifactId>gt-geojson</artifactId> <version>19.2</version> </dependency> <dependency> <groupId>org.json.simple</groupId> <artifactId>json-simple</artifactId> <version>1.1</version> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-pool</artifactId> <version>1.5.4</version> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang</artifactId> <version>2.6</version> </dependency> <dependency> <groupId>com.vividsolutions</groupId> <artifactId>jts</artifactId> <version>1.13</version> </dependency> </dependencies></project> |
具体Java代码
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package com.herbert.geotoool.util;import org.geotools.data.shapefile.ShapefileDataStore;import org.geotools.data.simple.SimpleFeatureIterator;import org.geotools.data.simple.SimpleFeatureSource;import org.geotools.geojson.feature.FeatureJSON;import org.opengis.feature.simple.SimpleFeature;import java.io.File;import java.io.IOException;import java.io.StringWriter;import java.nio.charset.Charset;/** * @author ：Herbert * @date ：Created in 2019/12/26 17:01 * @description： * @modified By： * @version: $ */public class ShapeModel { public static void main(String[] args) throws IOException { long start = System.currentTimeMillis(); String SHAPE_FILE = "F:\\MapData\\gisMap\\xian\\街道界线.shp"; // ShapeFile全路径 // 使用GeoTools读取ShapeFile文件 File shapeFile = new File(SHAPE_FILE); ShapefileDataStore store = new ShapefileDataStore(shapeFile.toURI().toURL()); //设置编码 Charset charset = Charset.forName("GBK"); store.setCharset(charset); SimpleFeatureSource sfSource = store.getFeatureSource(); SimpleFeatureIterator sfIter = sfSource.getFeatures().features(); // 从ShapeFile文件中遍历每一个Feature，然后将Feature转为GeoJSON字符串 while (sfIter.hasNext()) { SimpleFeature feature = (SimpleFeature) sfIter.next(); // Feature转GeoJSON FeatureJSON fjson = new FeatureJSON(); StringWriter writer = new StringWriter(); fjson.writeFeature(feature, writer); String sjson = writer.toString(); System.out.println("sjson===== >>>> " + sjson); } System.out.println("数据导入完成，共耗时"+(System.currentTimeMillis() - start)+"ms"); }} |
读取数据显示：
补充：JAVA 根据数据库表内容生产树结构JSON数据的实例代码
1、利用场景
组织机构树，通常会有组织机构表，其中有code(代码),pcode(上级代码),name(组织名称)等字段
2、构造数据（以下数据并不是组织机构数据，而纯属本人胡编乱造的数据）
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List<Tree<Test>> trees = new ArrayList<Tree<Test>>();tests.add(new Test("0", "", "关于本人"));tests.add(new Test("1", "0", "技术学习"));tests.add(new Test("2", "0", "兴趣"));tests.add(new Test("3", "1", "JAVA"));tests.add(new Test("4", "1", "oracle"));tests.add(new Test("5", "1", "spring"));tests.add(new Test("6", "1", "springmvc"));tests.add(new Test("7", "1", "fastdfs"));tests.add(new Test("8", "1", "linux"));tests.add(new Test("9", "2", "骑行"));tests.add(new Test("10", "2", "吃喝玩乐"));tests.add(new Test("11", "2", "学习"));tests.add(new Test("12", "3", "String"));tests.add(new Test("13", "4", "sql"));tests.add(new Test("14", "5", "ioc"));tests.add(new Test("15", "5", "aop"));tests.add(new Test("16", "1", "等等"));tests.add(new Test("17", "2", "等等"));tests.add(new Test("18", "3", "等等"));tests.add(new Test("19", "4", "等等"));tests.add(new Test("20", "5", "等等")); |
3、源码
Tree.java
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package pers.kangxu.datautils.bean.tree;import java.util.ArrayList;import java.util.List;import java.util.Map;import com.alibaba.fastjson.JSON;/** * tree TODO <br> * * @author kangxu2 2017-1-7 * */public class Tree<T> { /** * 节点ID */ private String id; /** * 显示节点文本 */ private String text; /** * 节点状态，open closed */ private String state = "open"; /** * 节点是否被选中 true false */ private boolean checked = false; /** * 节点属性 */ private List<Map<String, Object>> attributes; /** * 节点的子节点 */ private List<Tree<T>> children = new ArrayList<Tree<T>>(); /** * 父ID */ private String parentId; /** * 是否有父节点 */ private boolean isParent = false; /** * 是否有子节点 */ private boolean isChildren = false; public String getId() { return id; } public void setId(String id) { this.id = id; } public String getText() { return text; } public void setText(String text) { this.text = text; } public String getState() { return state; } public void setState(String state) { this.state = state; } public boolean isChecked() { return checked; } public void setChecked(boolean checked) { this.checked = checked; } public List<Map<String, Object>> getAttributes() { return attributes; } public void setAttributes(List<Map<String, Object>> attributes) { this.attributes = attributes; } public List<Tree<T>> getChildren() { return children; } public void setChildren(List<Tree<T>> children) { this.children = children; } public boolean isParent() { return isParent; } public void setParent(boolean isParent) { this.isParent = isParent; } public boolean isChildren() { return isChildren; } public void setChildren(boolean isChildren) { this.isChildren = isChildren; } public String getParentId() { return parentId; } public void setParentId(String parentId) { this.parentId = parentId; } public Tree(String id, String text, String state, boolean checked, List<Map<String, Object>> attributes, List<Tree<T>> children, boolean isParent, boolean isChildren, String parentID) { super(); this.id = id; this.text = text; this.state = state; this.checked = checked; this.attributes = attributes; this.children = children; this.isParent = isParent; this.isChildren = isChildren; this.parentId = parentID; } public Tree() { super(); } @Override public String toString() { return JSON.toJSONString(this); }} |
BuildTree.java
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package pers.kangxu.datautils.common.tree;import java.util.ArrayList;import java.util.List;import pers.kangxu.datautils.bean.tree.Tree;/** * 构建tree * TODO * <br> * @author kangxu2 2017-1-7 * */public class BuildTree { /** * * TODO * <br> * @author kangxu2 2017-1-7 * * @param nodes * @return */ public static <T> Tree<T> build(List<Tree<T>> nodes) { if(nodes == null){ return null; } List<Tree<T>> topNodes = new ArrayList<Tree<T>>(); for (Tree<T> children : nodes) { String pid = children.getParentId(); if (pid == null || "".equals(pid)) { topNodes.add(children); continue; } for (Tree<T> parent : nodes) { String id = parent.getId(); if (id != null && id.equals(pid)) { parent.getChildren().add(children); children.setParent(true); parent.setChildren(true); continue; } } } Tree<T> root = new Tree<T>(); if (topNodes.size() == 0) { root = topNodes.get(0); } else { root.setId("-1"); root.setParentId(""); root.setParent(false); root.setChildren(true); root.setChecked(true); root.setChildren(topNodes); root.setText("顶级节点"); } return root; }} |
BuildTreeTester.java
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package pers.kangxu.datautils.test;import java.util.ArrayList;import java.util.List;import pers.kangxu.datautils.bean.tree.Tree;import pers.kangxu.datautils.common.tree.BuildTree;public class BuildTreeTester { public static void main(String[] args) { List<Tree<Test>> trees = new ArrayList<Tree<Test>>(); List<Test> tests = new ArrayList<Test>(); tests.add(new Test("0", "", "关于本人")); tests.add(new Test("1", "0", "技术学习")); tests.add(new Test("2", "0", "兴趣")); tests.add(new Test("3", "1", "JAVA")); tests.add(new Test("4", "1", "oracle")); tests.add(new Test("5", "1", "spring")); tests.add(new Test("6", "1", "springmvc")); tests.add(new Test("7", "1", "fastdfs")); tests.add(new Test("8", "1", "linux")); tests.add(new Test("9", "2", "骑行")); tests.add(new Test("10", "2", "吃喝玩乐")); tests.add(new Test("11", "2", "学习")); tests.add(new Test("12", "3", "String")); tests.add(new Test("13", "4", "sql")); tests.add(new Test("14", "5", "ioc")); tests.add(new Test("15", "5", "aop")); tests.add(new Test("16", "1", "等等")); tests.add(new Test("17", "2", "等等")); tests.add(new Test("18", "3", "等等")); tests.add(new Test("19", "4", "等等")); tests.add(new Test("20", "5", "等等")); for (Test test : tests) { Tree<Test> tree = new Tree<Test>(); tree.setId(test.getId()); tree.setParentId(test.getPid()); tree.setText(test.getText()); trees.add(tree); } Tree<Test> t = BuildTree.build(trees); System.out.println(t); }}class Test { private String id; private String pid; private String text; public String getId() { return id; } public void setId(String id) { this.id = id; } public String getPid() { return pid; } public void setPid(String pid) { this.pid = pid; } public String getText() { return text; } public void setText(String text) { this.text = text; } public Test(String id, String pid, String text) { super(); this.id = id; this.pid = pid; this.text = text; } public Test() { super(); } @Override public String toString() { return "Test [id=" + id + ", pid=" + pid + ", text=" + text + "]"; }} |
4、运行结果
JSON数据：
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{ "checked": true, "children": [ { "checked": false, "children": [ { "checked": false, "children": [ { "checked": false, "children": [ { "checked": false, "children": [], "id": "12", "parent": true, "parentId": "3", "state": "open", "text": "String" }, { "checked": false, "children": [], "id": "18", "parent": true, "parentId": "3", "state": "open", "text": "等等" } ], "id": "3", "parent": true, "parentId": "1", "state": "open", "text": "JAVA" }, { "checked": false, "children": [ { "checked": false, "children": [], "id": "13", "parent": true, "parentId": "4", "state": "open", "text": "sql" }, { "checked": false, "children": [], "id": "19", "parent": true, "parentId": "4", "state": "open", "text": "等等" } ], "id": "4", "parent": true, "parentId": "1", "state": "open", "text": "oracle" }, { "checked": false, "children": [ { "checked": false, "children": [], "id": "14", "parent": true, "parentId": "5", "state": "open", "text": "ioc" }, { "checked": false, "children": [], "id": "15", "parent": true, "parentId": "5", "state": "open", "text": "aop" }, { "checked": false, "children": [], "id": "20", "parent": true, "parentId": "5", "state": "open", "text": "等等" } ], "id": "5", "parent": true, "parentId": "1", "state": "open", "text": "spring" }, { "checked": false, "children": [], "id": "6", "parent": true, "parentId": "1", "state": "open", "text": "springmvc" }, { "checked": false, "children": [], "id": "7", "parent": true, "parentId": "1", "state": "open", "text": "fastdfs" }, { "checked": false, "children": [], "id": "8", "parent": true, "parentId": "1", "state": "open", "text": "linux" }, { "checked": false, "children": [], "id": "16", "parent": true, "parentId": "1", "state": "open", "text": "等等" } ], "id": "1", "parent": true, "parentId": "0", "state": "open", "text": "技术学习" }, { "checked": false, "children": [ { "checked": false, "children": [], "id": "9", "parent": true, "parentId": "2", "state": "open", "text": "骑行" }, { "checked": false, "children": [], "id": "10", "parent": true, "parentId": "2", "state": "open", "text": "吃喝玩乐" }, { "checked": false, "children": [], "id": "11", "parent": true, "parentId": "2", "state": "open", "text": "学习" }, { "checked": false, "children": [], "id": "17", "parent": true, "parentId": "2", "state": "open", "text": "等等" } ], "id": "2", "parent": true, "parentId": "0", "state": "open", "text": "兴趣" } ], "id": "0", "parent": false, "parentId": "", "state": "open", "text": "关于本人" } ], "id": "-1", "parent": false, "parentId": "", "state": "open", "text": "顶级节点"} |
总结
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原文链接：https://www.cnblogs.com/zhaixingzhu/p/12562689.html
