利用ArcEngine类库获取ArcGIS数据

ArcGIS数据文件分为3种：shapefile,Coverage,Geodatabase。

shapefile一种基于文件方式存储GIS数据的文件格式，至少由shp,dbf,shx三个文件组成。分别存储空间，属性，2者关系。是GIS中比较通用的数据格式。

Coverage是一种矢量文件格式，几何和空间拓扑关系存储在二进制文件中，与之相关的属性数据则存放在INFO表或RDBMS中（PCArcInfo存储在DBF表中）。Coverage是对要素类组织后（featureclass）的集合，每个要素类都是一些点、线、面、annotation（文本）的集合。

Geodatabase一种基于RDBMS存储的数据格式。其有两大类：1、PersonalGeodatabase用来存储小数据量数据。存储在Access的mdb格式中。2、ArcSDEeodatabase用来存储大型数据。存储在大型数据库中，可实行并发操作，不过需要单独的用户许可。

对于ArcGIS数据文件，ESRI为JAVA语言提供了ArcEngine类库来进行ArcGIS的一切开发。对于ArcGIS3种数据文件的连接提供了统一的接口IWorkSpace，根据具体的数据有不同的实现类来实现数据文件的连接，而数据读取的方法一样，所以可以试用一个工厂模式写个工具类来统一获取3种数据。

需要导入arcobjects.jar

工厂模式连接数据统一接口：

import com.esri.arcgis.geodatabase.IFeatureClass;
public interface ConnectDataSource {
     public IFeatureClass getDataSource(String path,String className);
}

连接shape实现类：

import java.io.IOException;
import com.esri.arcgis.datasourcesfile.ShapefileWorkspaceFactory;
import com.esri.arcgis.geodatabase.IFeatureClass;
import com.esri.arcgis.geodatabase.Workspace;
import com.fjdz.inf.ConnectDataSource;

public class ConnectShape implements ConnectDataSource {
	IFeatureClass featureClass =null;
	public IFeatureClass getDataSource(String path, String className) {
		ShapefileWorkspaceFactory shapefileWorkspaceFactory;
		try {
			shapefileWorkspaceFactory = new ShapefileWorkspaceFactory();
			Workspace workspace = new Workspace(shapefileWorkspaceFactory.openFromFile(path, 0));
			featureClass = workspace.openFeatureClass(className);
		}catch (IOException e) {
			e.printStackTrace();
		}
		
		return featureClass;
	}

}

连接mdb:

import java.io.IOException;
import com.esri.arcgis.datasourcesGDB.AccessWorkspaceFactory;
import com.esri.arcgis.geodatabase.IFeatureClass;
import com.esri.arcgis.geodatabase.IFeatureWorkspace;
import com.fjdz.inf.ConnectDataSource;

public class ConnectAccess implements ConnectDataSource {
	IFeatureClass featureClass =null;
	public IFeatureClass getDataSource(String path, String className) {
		AccessWorkspaceFactory workspaceFactory;
		try {
			workspaceFactory = new AccessWorkspaceFactory();
			IFeatureWorkspace workspace = (IFeatureWorkspace)workspaceFactory.openFromFile(path, 0);
			featureClass= workspace.openFeatureClass(className);
		}catch (IOException e) {
		       e.printStackTrace();
		}		
		return featureClass;
	}

}

数据读取类：

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import com.esri.arcgis.geodatabase.IFeature;
import com.esri.arcgis.geodatabase.IFeatureClass;
import com.esri.arcgis.geodatabase.IFeatureCursor;
import com.esri.arcgis.geodatabase.IField;
import com.esri.arcgis.geodatabase.IFields;
import com.fjdz.bean.DataBean;
import com.fjdz.enumfactory.FactoryType;
import com.fjdz.inf.ConnectDataSource;
import com.fjdz.inf.IQueryFactory;

public class QueryFactory{
	
	IFeatureClass featureClass = null;
	ConnectDataSource connectDatasource = null;
	public List<DataBean> Query(String type,String path,String className){
		List<DataBean> datalist = new ArrayList<DataBean>();
		try{
			if("shape".equals(type)){
				connectDatasource = new ConnectShape();				
			}else if("mdb".equals(type)){
				connectDatasource = new ConnectAccess();
			}
			featureClass = connectDatasource.getDataSource(path, className);
			IFeatureCursor cursor = featureClass.search(null, true);
			IFields fields = cursor.getFields();
			int fieldCount = fields.getFieldCount();
			IFeature feature = cursor.nextFeature();
			while(feature != null){
				 List<String> value = new ArrayList<String>();
				 DataBean dataBean = new DataBean();
				 for (int k = 0; k < fieldCount; k++) {								    
					 value.add((feature.getValue(k)).toString());		    
				 }
				 dataBean.setList(value);
			}
			datalist.add(dataBean);
			feature = cursor.nextFeature();			
		} catch (IOException e) {
			e.printStackTrace();
		}
		return datalist;
}

到此ArcGIS数据获取的方法就全部介绍完。