J2EE工具类：WebHttpClient.java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;

public class WebHttpClient {

	/**
	 * 获得网页中的所有HTML内容
	 * @param url
	 * @param charset
	 * @return
	 */
	public String getWebContentByGet(String url,String charset){
		HttpClient client = new HttpClient();
		GetMethod getMethod = new GetMethod(url);
		StringBuilder sb = new StringBuilder();
		try {
			// 状态码
			int statusCode=client.executeMethod(getMethod);
			if (statusCode == HttpStatus.SC_OK) {
				//获得HTML文本
				BufferedReader bf = new BufferedReader(new InputStreamReader(
						getMethod.getResponseBodyAsStream(), charset));
				String line = null;
				while ((line = bf.readLine()) != null) {
					sb.append(line).append("\r\n");
				}
				bf.close();
			}
		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			getMethod.releaseConnection();
		}
		return sb.toString();
	}
	/**
	 * 获得网页中的所有HTML内容
	 * @param url
	 * @param mapData:传递的参数
	 * @param charset
	 * @return
	 */
	public String getWebContentByPost(String url,Map<String,String> mapData,String charset){
		HttpClient client = new HttpClient();
		PostMethod postMethod = new PostMethod(url);
		StringBuilder sb = new StringBuilder();
		// 填入各个表单域的值
		NameValuePair[] data = new NameValuePair[mapData.size()];
		Set set = mapData.entrySet();
		Iterator iterator = set.iterator();
		int i=0;
		while (iterator.hasNext()) {
			Map.Entry entry = (Map.Entry) iterator.next();
			data[i]=new NameValuePair((String)entry.getKey(),(String)entry.getValue());
			i++;
		}
		/*
		NameValuePair[] data = {new NameValuePair("toPath","toPath"),
								new NameValuePair("action","login"),
								new NameValuePair("loginname","13761083826"),
								new NameValuePair("password","111111")
								};
		*/
		// 将表单的值放入postMethod中
		postMethod.setRequestBody(data);
		try {
			int statusCode = client.executeMethod(postMethod);
			if (statusCode == HttpStatus.SC_OK) {
				//获得HTML文本
				BufferedReader bf = new BufferedReader(new InputStreamReader(
						postMethod.getResponseBodyAsStream(), charset));
				String line = null;
				while ((line = bf.readLine()) != null) {
					sb.append(line).append("\r\n");
				}
				bf.close();
			}
		} catch (HttpException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {
			postMethod.releaseConnection();
		}
		return sb.toString();
	}
	public static void main(String[] str) {
		//get
		WebHttpClient util=new WebHttpClient();
		String content=util.getWebContentByGet("http://www.baidu.com", "gb2312");
		System.out.println(content);
		//post
//		Map<String,String> map=new HashMap<String,String>();
//		map.put("toPath","toPath");
//		map.put("action","login");
//		map.put("loginname","13761083826");
//		map.put("password","111111");
//		String content=util.getWebContentByPost("http://localhost:8080/Lottery/login.portal",map, "UTF-8");
//		System.out.println(content);
	}
}

HTTPClient PostMethod 中文乱码问题解决方案（2种）
http://blog.csdn.net/apei830/archive/2010/04/25/5526236.aspx