client是httpclient的实例，设置代理的代码

client是httpclient的实例，设置代理的代码如下：
client.getHostConfiguration().setProxy(ip, port);
client.getParams().setCookiePolicy(CookiePolicy.BROWSER_COMPATIBILITY);
client.getParams().setIntParameter(HttpClientParams.MAX_REDIRECTS, 5);
NTCredentials defaultcreds = new NTCredentials(userName, password,ip,field==null?"":field);
client.getState().setProxyCredentials(new AuthScope(ip, port, field), defaultcreds);

若认证方案为Basic，可以成功。头部信息会有Proxy-Authorization: Basic enh6Onp4eg==
若认证方案为NTLM，就失败。
不知道为什么在请求的头部一直都不添加认证信息，只有个Proxy-Connection: Keep-Alive，没有Proxy-Authorization:的头部信息。
ip, port,userName, password都不是空的。httpclient的版本是3.1的。
下面是一段日志信息：
2008-12-25 09:37:47 DEBUG [org.apache.commons.httpclient.HttpMethodDirector] enter HttpMethodBase.processAuthenticationResponse(HttpState, HttpConnection)
2008-12-25 09:37:47 DEBUG [org.apache.commons.httpclient.auth.AuthChallengeProcessor] Supported authentication schemes in the order of preference: [ntlm, digest, basic]
2008-12-25 09:37:47  INFO [org.apache.commons.httpclient.auth.AuthChallengeProcessor] ntlm authentication scheme selected
2008-12-25 09:37:47 DEBUG [org.apache.commons.httpclient.auth.AuthChallengeProcessor] Using authentication scheme: ntlm
2008-12-25 09:37:47 DEBUG [org.apache.commons.httpclient.auth.AuthChallengeProcessor] Authorization challenge processed
2008-12-25 09:37:47 DEBUG [org.apache.commons.httpclient.HttpMethodDirector] Proxy authentication scope: NTLM <any realm>@192.168.2.3:8080
2008-12-25 09:37:47 DEBUG [org.apache.commons.httpclient.HttpState] enter HttpState.getProxyCredentials(AuthScope)
2008-12-25 09:37:47 DEBUG [org.apache.commons.httpclient.HttpMethodDirector] Retry authentication
2008-12-25 09:37:47 DEBUG [org.apache.commons.httpclient.HttpMethodBase] Resorting to protocol version default close connection policy
2008-12-25 09:37:47 DEBUG [org.apache.commons.httpclient.HttpMethodBase] Should NOT close connection, using HTTP/1.1
2008-12-25 09:37:47 DEBUG [org.apache.commons.httpclient.HttpConnection] enter HttpConnection.isResponseAvailable()
2008-12-25 09:37:47 DEBUG [org.apache.commons.httpclient.HttpConnection] enter HttpConnection.releaseConnection()
2008-12-25 09:37:47 DEBUG [org.apache.commons.httpclient.HttpConnection] Connection is locked.  Call to releaseConnection() ignored.
2008-12-25 09:37:47 DEBUG [org.apache.commons.httpclient.HttpMethodDirector] Authenticating with NTLM <any realm>@192.168.2.3:8080
2008-12-25 09:37:47 DEBUG [org.apache.commons.httpclient.HttpState] enter HttpState.getProxyCredentials(AuthScope)
2008-12-25 09:37:47 DEBUG [org.apache.commons.httpclient.auth.NTLMScheme] enter NTLMScheme.authenticate(Credentials, HttpMethod)
2008-12-25 09:37:47 DEBUG [org.apache.commons.httpclient.HttpConnection] enter HttpConnection.releaseConnection()

正常情况下应该在enter NTLMScheme.authenticate(Credentials, HttpMethod)后再执行HttpMethodBase.addRequestHeader(Header)
但是没有，而是enter HttpConnection.releaseConnection()。

请大家帮帮忙阿，谢谢阿！急！！！
 
 
主要是设置http头
在HostConfiguration.setProxy里设置。如下面代码：
import java.io.IOException; 
import java.util.ArrayList; 
import java.util.List; 
 
import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler; 
import org.apache.commons.httpclient.Header; 
import org.apache.commons.httpclient.HttpClient; 
import org.apache.commons.httpclient.HttpException; 
import org.apache.commons.httpclient.HttpStatus; 
import org.apache.commons.httpclient.UsernamePasswordCredentials; 
import org.apache.commons.httpclient.auth.AuthScope; 
import org.apache.commons.httpclient.methods.GetMethod; 
import org.apache.commons.httpclient.params.HttpMethodParams; 
 
public class HttpClientUse { 
 
    public static void main(String[] args) throws HttpException, IOException { 
        HttpClient httpClient = new HttpClient(); 
 
        httpClient.getHostConfiguration().setProxy("localhost", 808); 
 
        /*//需要验证 
        UsernamePasswordCredentials creds = new UsernamePasswordCredentials("chenlb", "123456"); 

        httpClient.getState().setProxyCredentials(AuthScope.ANY, creds); 
        */ 
 
        //设置http头 
        List <Header> headers = new ArrayList <Header>(); 
        headers.add(new Header("User-Agent", "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)")); 
        httpClient.getHostConfiguration().getParams().setParameter("http.default-headers", headers); 
 
        GetMethod method = new GetMethod("http://www.baidu.com"); 
        method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, 
                new DefaultHttpMethodRetryHandler(3, false)); 
        try { 
            int statusCode = httpClient.executeMethod(method); 
 
            if (statusCode != HttpStatus.SC_OK) { 
                System.out.println("Method failed code="+statusCode+": " + method.getStatusLine()); 
 
            } else { 
                System.out.println(new String(method.getResponseBody(), "gb2312")); 
            } 
        } finally { 
            method.releaseConnection(); 
        } 
    } 
} 
如果要用户名与密码验证的，请把/* */注释去掉。使验证有效。

验证，关键是：

UsernamePasswordCredentials creds = new UsernamePasswordCredentials("chenlb", "123456"); 
 
httpClient.getState().setProxyCredentials(AuthScope.ANY, creds); 
设置http请求头.

List <Header> headers = new ArrayList <Header>(); 
headers.add(new Header("User-Agent", "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)")); 
httpClient.getHostConfiguration().getParams().setParameter("http.default-headers", headers);  
 

 发表于：2008-12-26 13:08:202楼 得分:0
认证方案为Basic，可以成功。是在我本机测的,用的代理服务器软件.
然后把程序给其他的人,其他人的代理服务器认证方案是NTLM的，不知道为什么不成功
 
哦，谢谢。
不过若认证方案是NTLM的不能用UsernamePasswordCredentials，而必须要用NTCredentials实例。
NTCredentials实例我已经创建好了，且设置了setProxyCredentials。

若是代理认证，httpclient会自己添加代理认证头部信息。自己添加不好实现，因为需要用到几种编码转化。