cswclient.java

esri的ArcGIS Server超级学习模板程序（for java）

package com.esri.solutions.jitk.datasources.ogc.csw;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpMethodBase;
import org.apache.commons.httpclient.methods.ByteArrayRequestEntity;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

import org.xml.sax.SAXException;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;


/**
 * CswClient class is used to submit CSW search request.
 *
 * @remark CswClient is a wrapper class of .NET HttpWebRequest and HttpWebResponse.
 * It basically submits a HTTP request then return a text response.
 * @version 1.0
 * @created 25-Jul-2007 1:40:24 PM
 */
public class CswClient {
    /**
     * use static variable to be thread safe
    * (FROM C# CODE: MAY BE REMOVED LATER)
    *
     */

    //	private static CookieContainer _cookieContainer;
    //	private CredentialCache _credentialCache;

    /**
     * Constructor
     */
    public CswClient() {
    }

    /**
     * Encode PostBody
     *
     * @remark Encode special characters (such as %, space, <, >, \, and &) to percent
     * values.
     * @returns Encoded text.
     *
     * @param postbody    Text to be encoded
     */
    public String encodePostbody(String postbody) {
        return "";
    }

    /**
     * Submit HTTP Request
     *
     * @returns Response in plain text
     *
     * @param method    HTTP Method. for example "POST", "GET"
     * @param URL    URL to send HTTP Request to
     * @param postdata    Data to be posted
     * @throws IOException
     */
    public InputStream submitHttpRequest(String method, String url,
        String postdata) throws IOException {
        return submitHttpRequest(method, url, postdata, "", "");
    }

    /**
     * Submit HTTP Request (Both GET and POST). Return InputStream object from the response
     *
     * @remark Submit an HTTP request.
     * @returns Response in plain text.
     *
     * @param method    HTTP Method. for example "POST", "GET"
     * @param URL    URL to send HTTP Request to
     * @param postdata    Data to be posted
     * @param usr    Username
     * @param pwd    Password
     * @throws IOException
     */
    public InputStream submitHttpRequest(String method, String urlString,
        String postdata, String usr, String pwd) throws IOException {
        HttpClient httpClient = null;
        HttpMethodBase httpMethod = null;
        ByteArrayRequestEntity requestEntity = null;

        try {
            httpClient = new HttpClient();

            if (method.equalsIgnoreCase("get")) {
                httpMethod = new GetMethod(urlString);
            } else {
                httpMethod = new PostMethod(urlString);

                PostMethod postMethod = (PostMethod) httpMethod;

                requestEntity = new ByteArrayRequestEntity(postdata.getBytes(),
                        "application/xml");
                postMethod.setRequestEntity(requestEntity);
            }

            httpClient.executeMethod(httpMethod);

            return new ByteArrayInputStream(httpMethod.getResponseBody());
        } finally {
            if (httpMethod != null) {
                httpMethod.releaseConnection();
            }
        }
    }

    /**
     * Submit HTTP Request (Both GET and POST). Parse the response into an xml document element.
     * @param method
     * @param urlString
     * @param postdata
     * @param usr
     * @param pwd
     * @param response
     * @throws IOException
     * @throws ParserConfigurationException
     * @throws SAXException
     */
    public Element submitHttpRequest(String method, String urlString,
        String postdata, String usr, String pwd, Element res)
        throws IOException, ParserConfigurationException, SAXException {
        Element response;
        HttpClient httpClient = null;
        HttpMethodBase httpMethod = null;
        ByteArrayRequestEntity requestEntity = null;
        DocumentBuilderFactory factory = null;
        DocumentBuilder docBuilder = null;
        Document doc = null;

        try {
            httpClient = new HttpClient();

            if (method.equalsIgnoreCase("get")) {
                httpMethod = new GetMethod(urlString);
            } else {
                httpMethod = new PostMethod(urlString);

                PostMethod postMethod = (PostMethod) httpMethod;

                requestEntity = new ByteArrayRequestEntity(postdata.getBytes(),
                        "application/xml");
                postMethod.setRequestEntity(requestEntity);
            }

            httpClient.executeMethod(httpMethod);

            // Get a response
            factory = DocumentBuilderFactory.newInstance();

            docBuilder = factory.newDocumentBuilder();
            doc = docBuilder.parse(httpMethod.getResponseBodyAsStream());

            response = doc.getDocumentElement();
            response.normalize();

            return response;
        } finally {
            if (httpMethod != null) {
                httpMethod.releaseConnection();
            }
        }
    }
}