java httpclient问题

Question

用httpclient模拟登录一个网站，返回状态码（301或302等），我想不要处理返回状态码，直接用postMethod导向我要的页面，可以不考虑跳转吗？（不是说httpclient自动管理cookie，跳转应该可以忽略吧，哈哈，我的理解），求高手解释啊

Answer 1

HttpClient支持自动转向处理，但是象POST和PUT方式这种要求接受后继服务的请求方式，暂时不支持自动转向，因此如果碰到POST方式提交后返回的是301或者302的话需要自己处理。

参考下例：
[code="java"]httpClient.getParams().setCookiePolicy(CookiePolicy.BROWSER_COMPATIBILITY);
httpClient.getHostConfiguration().setHost("www.xiaonei.com", 80, "http");
String url = "http://login.xiaonei.com/Login.do";
PostMethod method = new PostMethod(url);
NameValuePair email = new NameValuePair( "email" , "" );//邮箱
NameValuePair password = new NameValuePair( "password" , "" );//密码
method.addRequestHeader("Content-Type","application/x-www-form-urlencoded;charset=gb2312");
NameValuePair[] data = { email,password};
method.setRequestBody(data);
try {

httpClient.executeMethod(method);
Cookie[] cookies=httpClient.getState().getCookies();
httpClient.getState().addCookies(cookies);
method.releaseConnection();
int state = method.getStatusCode();

// System.out.print(state);
String newUrl = "";
if ((state == HttpStatus.SC_MOVED_TEMPORARILY) || (state == HttpStatus.SC_MOVED_PERMANENTLY) || (state == HttpStatus.SC_SEE_OTHER) || (state == HttpStatus.SC_TEMPORARY_REDIRECT)){
Header header = method2.getResponseHeader("location");

if(header != null){

newUrl = header.getValue(); //获得跳转页面地址

//System.out.println("newUrl: "+newUrl);
if(newUrl == null || newUrl.equals("")){
newUrl = "/";
}
String urlx=null;
//以get方式请求跳转页面
GetMethod getMethod = new GetMethod(newUrl);
getMethod.setRequestHeader("Cookie",cookies.toString());

httpClient.excuteMethod(getMethod);

getMethod.releaseConnection();
urlx="rundll32 url.dll,FileProtocolHandler "+newUrl;
Runtime.getRuntime().exec("cmd.exe /c start "+ urlx);[/code]

同时请参考一下下文，有些地方解释的非常详细。

http://yefeng.iteye.com/blog/112565