httpclient 4.3 通过验证码登录总是失败，请高手指教!

[chen_2001]

String verifyImageUrl = "http://localhost:8080/verifyCode.aspx";
String loginUrl = "http://localhost:8080/login.aspx";
byte[] htmlVerifyImage = WebUtil.getByteByUrl(httpClient, verifyImageUrl);
ImageIcon img = new ImageIcon(htmlVerifyImage);
//保存图片,图片内容是1-9，a-z,A-Z的一个字符窜
String verifyCode = "xxxxxx";//图片内容
//下面进行登录操作，输入用户名/密码/验证码（图片内容）
HttpPost httpPost = new HttpPost(loginUrl);
httpPost.setHeader("User-Agent","Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:20.0) Gecko/20100101 Firefox/20.0"); httpPost.setHeader("Accept","text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
httpPost.setHeader("Accept-Language","zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3");
List<NameValuePair> nvp = new ArrayList<NameValuePair>();

nvp.add(new BasicNameValuePair("username", "admin"));

nvp.add(new BasicNameValuePair("password", "admin"));

nvp.add(new BasicNameValuePair("verifycode",verifyCode));

HttpResponse httpResponse = null;
try {
httpPost.setEntity(new UrlEncodedFormEntity(nvp, HTTP.UTF_8));
httpResponse = httpClient.execute(httpPost);
System.out.println(httpResponse.getStatusLine().getStatusCode());
HttpEntity httpEntity = httpResponse.getEntity();

后面就不写了，反正又回到登录页面；直接用浏览器就会跳到首页，表示登录成功

大侠们帮忙看看，问题出在哪？

[teemai]

验证码没有匹配对

[chen_2001]

我用的是第一次请求返回的cookie里的验证码(和我保存的图片内容一至)，否则用哪个啊？

[花谢尊前不敢香]

当前验证码和你获取的验证码不一致吧，又跳到首页。

[tony4geek]

这些类似的如sesseion 验证码 ，cookie 等方面看看。

[antony0203]

没看到你去判断验证码的代码阿,单这些看不出来问题