JAVA程序里面怎么测试一个Servlet是否可用

比如说一个SERVLET的地址是
http://www.sina.com.cn/test/servlet
（这个SERVLET是我自己可以修改的）
现在我这里的程序要测试这个连结是否正常
我在JAVA里面的程序应该怎么写才好？
这个还有跨域的问题，不能用AJAX去试
我想在JAVA里面测试

redstarofsleep的没错，我来个完整的
[code="java"]
import java.io.IOException;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.methods.StringRequestEntity;

public class HttpSender {

public String send(String url,  String request) throws Exception {

    String response = null;
    HttpClient httpClient = new HttpClient();
    PostMethod method = new PostMethod(url);
    method.addRequestHeader("charset", "GBK");
    method.addRequestHeader("content-type", "application/x-www-form-urlencoded");
    method.setRequestEntity(new StringRequestEntity(request, null, "GBK"));

    try {
        int retcode = httpClient.executeMethod(method);
        if (retcode == HttpStatus.SC_OK) {
            byte[] responseBody = new byte[10240];
            java.io.InputStream istream = method.getResponseBodyAsStream();
            int npos = 0;
            int nread = 0;
            while ((nread = istream.read(responseBody, npos, responseBody.length - npos)) >= 0) {
                npos += nread;
                if (npos >= responseBody.length) {
                    byte[] tmpBuf = new byte[npos + 51200];
                    System.arraycopy(responseBody, 0, tmpBuf, 0, npos);
                    responseBody = tmpBuf;
                }
            }
            response = new String(responseBody, 0, npos);
        } else {
            throw new IOException("发送失败: retcode: " + retcode);
        }
          method.releaseConnection();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return response;
}

public static void main(String[] args) throws Exception {
    String reqStr = "<?xml version=\"1.0\" encoding=\"GBK\"?><request><params><param><curDate>20101010</curDate></param></params></request>";
    HttpSender sender = new HttpSender();
    String reponse = sender.send("http://www.sina.com.cn/test/servlet", reqStr);
    System.out.println("返回报文"+reponse);
}

}
[/code]
当然，你的web.xml要配置
[code="java"]

servlet
com.xx.YourServlet

<servlet-mapping>
    <servlet-name>servlet</servlet-name>
    <url-pattern>/servlet</url-pattern>
</servlet-mapping>

[/code]

[code="java"]
URL url = new URL("http://www.hrtsea.com/down/soft/45.htm");
//返回一个 URLConnection 对象，它表示到 URL 所引用的远程对象的连接。
URLConnection uc = url.openConnection();
//打开的连接读取的输入流。
InputStream in = uc.getInputStream();
int c;
while ((c = in.read()) != -1)
System.out.print(c);
in.close();
[/code]

直接用浏览器输入地址不就行了么，要搞那么麻烦干嘛

用Java发送Http请求
可以用Apache的Httpclient包
[code="java"]
HttpClient httpClient = new DefaultHttpClient();
// HttpGet get = new HttpGet("http://local:8084");
HttpPost get = new HttpPost("http://localhost:8080");
HttpResponse response = httpClient.execute(get);
HttpEntity entity = response.getEntity();
String xmlString = null;
if (entity != null) {
entity = new BufferedHttpEntity(entity);

        InputStream in = entity.getContent();
        byte[] read = new byte[1024];
        byte[] all = new byte[0];
        int num;
        while ((num = in.read(read)) > 0) {
            byte[] temp = new byte[all.length + num];
            System.arraycopy(all, 0, temp, 0, all.length);
            System.arraycopy(read, 0, temp, all.length, num);
            all = temp;
        }
        System.out.println(new String(all));
        xmlString = new String(all);
        in.close();
    }
    get.abort();

[/code]

使用HttpClient

最简单的方式就是通过浏览器直接敲地址验证。
非要用Java的话，可以模拟Http的请求去验证。可用的第三方插件例如apache的http插件。

window.location就可以了吗？楼主如果只是单独的测试这个问题肯定搞定。