WebDav的java客戶端開發包：Jackrabbit

上一篇帖子“WebDav的java客戶端開發包：sardine”中說到，對於開發WebDav客戶端
sardine是一個很好的選擇，但sardine並未實現WevDav的全部規范，所以我又試了試
apache的Jackrabbit，這個是已退休的slide的替代品。
Jackrabbit中的WevDav客戶端只是一個附帶的模塊，並不是Jackrabbit的主要功能，
所以關於開發的文檔很少，我只找到一篇：
http://wiki.apache.org/jackrabbit/WebDAV
我是下載的jackrabbit-standalone-2.0.3.jar包，其中應該大部分類都用不到，不過
我沒找到單獨的WebDav客戶端的包。

演示程序的主要處理就是創建了一個目錄，然后上載了jpg文件，最后列出了創建目錄
中的內容。其中創建目錄要用MkCol命令，上載用Put命令，列出目錄內容其實是列出
指定路徑下的所有屬性。我沒有仔細研究過WebDav的規范，估計jackrabbit是按照規范
實現的，需要理解WebDav的規范才能很好地使用，sardine則要接近對WebDav的一般性
理解，不需要理解相應的規范就可以快速地開始使用。

下面就是我的演示程序代碼：

package test;

import java.io.FileInputStream;
import java.io.IOException;

import org.apache.commons.httpclient.Credentials;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.UsernamePasswordCredentials;
import org.apache.commons.httpclient.auth.AuthScope;
import org.apache.commons.httpclient.methods.InputStreamRequestEntity;
import org.apache.commons.httpclient.methods.RequestEntity;
import org.apache.jackrabbit.webdav.DavConstants;
import org.apache.jackrabbit.webdav.DavException;
import org.apache.jackrabbit.webdav.MultiStatus;
import org.apache.jackrabbit.webdav.MultiStatusResponse;
import org.apache.jackrabbit.webdav.client.methods.DavMethod;
import org.apache.jackrabbit.webdav.client.methods.MkColMethod;
import org.apache.jackrabbit.webdav.client.methods.PropFindMethod;
import org.apache.jackrabbit.webdav.client.methods.PutMethod;

public class TestJackrabbit {
    public static void main(String[] args) throws IOException, DavException {
        HttpClient client = new HttpClient();
        Credentials creds = new UsernamePasswordCredentials("admin", "admin");
        client.getState().setCredentials(AuthScope.ANY, creds);

        DavMethod mkCol = new MkColMethod("http://192.168.1.71:4502/crx/repository/crx.default/content/dam/testfolder");
        client.executeMethod(mkCol);
        System.out.println("mkcol testfolder:" + mkCol.getStatusCode() + " " + mkCol.getStatusText());

        PutMethod put = new PutMethod("http://192.168.1.71:4502/crx/repository/crx.default/content/dam/testfolder/testimg.jpg");
        RequestEntity requestEntity = new InputStreamRequestEntity(new FileInputStream("img12.jpg"));
        put.setRequestEntity(requestEntity);
        client.executeMethod(put);
        System.out.println("put image file:" + put.getStatusCode() + " " + put.getStatusText());

        DavMethod find = new PropFindMethod("http://192.168.1.71:4502/crx/repository/crx.default/content/dam/testfolder", DavConstants.PROPFIND_ALL_PROP, DavConstants.DEPTH_1);
        client.executeMethod(find);
        MultiStatus multiStatus = find.getResponseBodyAsMultiStatus();
        MultiStatusResponse[] responses = multiStatus.getResponses();
        System.out.println("Folders and files:");
        for (int i=0; i<responses.length; i++) {
            System.out.println(responses[i].getHref());
        }
    }
}