java

package http;

import com.gargoylesoftware.htmlunit.WebClient;
import com.gargoylesoftware.htmlunit.html.HtmlElement;
import com.gargoylesoftware.htmlunit.html.HtmlPage;

public class http {
    public static void main(String[] args) throws Exception {
    WebClient webClient =  new WebClient();//创建WebClient
    HtmlPage page = webClient.getPage("http://*****/wp-admin/");    //打开百度
    //获得name为"登陆"的html元素
    HtmlElement htmlElement = page.getElementByName("wp-submit"); 
    page = htmlElement.click();//调用click()方法
    //获得name为"username"的html元素
    HtmlElement usernameEle = page.getElementByName("user_login"); 
    //获得id为"password"的html元素
    HtmlElement passwordEle = (HtmlElement) page.getElementById("user_pass");
    usernameEle.focus();   //设置输入焦点
    usernameEle.type("***");  //填写值

    passwordEle.focus();   //设置输入焦点
    passwordEle.type("****");  //填写值
    //获得name为"登陆"的元素 
    HtmlElement submitEle = page.getElementByName("登陆"); 
    //点击“登陆”
    page = submitEle.click();
    String result = page.asXml();//获得click()后的html页面（包括标签）
    if(result.contains("登陆成功！")){
         System.out.println("登陆成功");     
    }else{
         System.out.println("登陆失败");
    }
  }
}

http://www.cnblogs.com/cha1r/p/3410966.html

package http;

import java.util.ArrayList;  
import java.util.List;   

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;  
import org.apache.http.client.entity.UrlEncodedFormEntity;  
import org.apache.http.client.methods.HttpPost;  
import org.apache.http.impl.client.DefaultHttpClient;  
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

public class httptests {
    /** 
     * @param args 
     * @throws Exception 
     */  
    public static void main(String[] args) throws Exception {  
        try {
            HttpClient client = new DefaultHttpClient();                //构建一个Client
            HttpPost post = new HttpPost("http://mail.163.com/");    //构建一个POST请求
            //构建表单参数
            List<NameValuePair> formParams = new ArrayList<NameValuePair>();
            formParams.add(new BasicNameValuePair("username", "********"));
            formParams.add(new BasicNameValuePair("password", "*****"));
            UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formParams, "UTF-8");//将表单参数转化为“实体”
            post.setEntity(entity);        //将“实体“设置到POST请求里
                      
            HttpResponse response = client.execute(post);//提交POST请求
            HttpEntity result = response.getEntity();//拿到返回的HttpResponse的"实体"
            String content = EntityUtils.toString(result);;            //用httpcore.jar提供的工具类将"实体"转化为字符串打印到控制台
            System.out.println(content);
            if(content.contains("登陆成功")){
            System.out.println("登陆成功！！！");
            }
            } catch (Exception e) {
            e.printStackTrace();
            }       
        
        
        
        
        
//        HttpClient httpclient = new HttpClient();  
//        PostMethod httpPost =new PostMethod("******/abc");  
//        NameValuePair[] param = { new NameValuePair("username", "vip")};  
//        httpPost.setRequestBody(param);   
//        httpclient.executeMethod(httpPost);  
    }  
}