HtmlUnit测试工具的推出，创意非常好。是一款给java开发用的browser。说它是browser，其实它是对html建模并且提供API来访问页面，点击链接等等的java类库。

import java.io.IOException;

import java.net.MalformedURLException;

import java.net.URL;

import java.util.Arrays;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import com.gargoylesoftware.htmlunit.BrowserVersion;

import com.gargoylesoftware.htmlunit.FailingHttpStatusCodeException;

import com.gargoylesoftware.htmlunit.HttpMethod;

import com.gargoylesoftware.htmlunit.WebClient;

import com.gargoylesoftware.htmlunit.WebRequest;

import com.gargoylesoftware.htmlunit.html.HtmlForm;

import com.gargoylesoftware.htmlunit.html.HtmlInput;

import com.gargoylesoftware.htmlunit.html.HtmlPage;

import com.gargoylesoftware.htmlunit.html.HtmlSubmitInput;

import com.gargoylesoftware.htmlunit.util.NameValuePair; 

public class MySina { 

    private WebClient  client;

    private WebRequest request;

    private String     sinaLoginUrl = " http://mail.sina.com.cn/cgi-bin/login.php";

    private String     hostSinaUrl  = ""; 

    public static void main(String[] args) throws FailingHttpStatusCodeException, MalformedURLException, IOException {

        String username = "***";

        String password = "***";

        String newpassword = "***";

        String nickname = "***"; 

        MySina mySina = new MySina();

        if (mySina.mailLoginBySina(username, password)) { // 登录

            mySina.updatePwdBySina(password, newpassword); // 修改密码

            mySina.updateNickName(nickname); // 修改帐户昵称

        } else {

            System.out.println("登录失败！请检查用户名和密码是否正确！");

        }

    } 

    public MySina(){

        client = new WebClient(BrowserVersion.INTERNET_EXPLORER_8);

        client.setJavaScriptEnabled(false);

    } 

    /**

     * 更改帐户昵称

     *

     * @param nickname 昵称

     * @return boolean

     * @throws FailingHttpStatusCodeException

     * @throws IOException

     */ 

    public boolean updateNickName(String nickname) throws FailingHttpStatusCodeException, IOException {

        String sinaSetUrl = hostSinaUrl + "basic/setting_account";

        request = new WebRequest(new URL(sinaSetUrl), HttpMethod.POST);

        request.setCharset("utf-8");

        request.setRequestParameters(Arrays.asList(new NameValuePair("nickname", nickname), new NameValuePair("pop3",

                                                                                                              "on"),

                                                   new NameValuePair("imap", "on")));

        client.getPage(request);

        HtmlPage p = client.getPage(hostSinaUrl + "classic/index.php"); 

        if (p.getBody().getTextContent().indexOf("\"NickName\":\"" + nickname + "\"") > 0) {

            return true;

        } else {

            return false;

        } 

    } 

    /**

     * 修改密码

     *

     * @param oldpassword 旧密码

     * @param newpassword 新密码

     * @return boolean

     * @throws FailingHttpStatusCodeException

     * @throws IOException

     */ 

    public boolean updatePwdBySina(String oldpassword, String newpassword) throws FailingHttpStatusCodeException,

                                                                          IOException {

        String sinaSetUrl = " http://login.sina.com.cn/member/security/password.php";

        request = new WebRequest(new URL(sinaSetUrl), HttpMethod.POST);

        request.setCharset("gbk");

        request.setRequestParameters(Arrays.asList(new NameValuePair("pass", oldpassword),

                                                   new NameValuePair("pass1", newpassword),

                                                   new NameValuePair("pass2", newpassword)));

        HtmlPage p = client.getPage(request); 

        if (p.getBody().getTextContent().indexOf("您的密码修改成功") > 0) {

            return true;

        } else {

            return false;

        }

    } 

    /**

     * 登录

     *

     * @param username 用户名

     * @param password 密码

     * @return boolean

     * @throws FailingHttpStatusCodeException

     * @throws MalformedURLException

     * @throws IOException

     */ 

    public boolean mailLoginBySina(String username, String password) throws FailingHttpStatusCodeException,

                                                                    MalformedURLException, IOException { 

        HtmlPage loginPage = client.getPage(sinaLoginUrl);

        HtmlForm loginForm = loginPage.getFormByName("free");

        HtmlInput u = loginForm.getInputByName("u");

        HtmlInput psw = loginForm.getInputByName("psw");

        HtmlSubmitInput loginButton = loginForm.getInputByName("登录");

        u.setValueAttribute(username);

        psw.setValueAttribute(password);

        HtmlPage result = loginButton.click();

        String resultUrl = result.getUrl().toString(); 

        if (resultUrl.indexOf("classic/index.php") > 0) {

            String regex = "http://(.*?)/";

            hostSinaUrl = myRegex(resultUrl, regex, null);

            if (hostSinaUrl.length() > 0) {

                return true;

            } else {

                return false;

            }

        } else {

            return false;

        } 

    } 

    /**

     * 正则匹配替换

     *

     * @param str

     * @param reg

     * @param replace

     * @return

     */ 

    public String myRegex(String str, String reg, String[] replace) {

        String result = null;

        Matcher m = Pattern.compile(reg).matcher(str);

        while (m.find()) {

            result = m.group();

            if (replace != null && replace.length > 0) {

                for (String s : replace) {

                    result = result.replace(s, "");

                }

            }

        }

        return result;

    }

}