J2EE工具類：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 {

    /**
      * 獲得網頁中的所有HTML內容
      * @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 {
            // 狀態碼
            int statusCode=client.executeMethod(getMethod);
            if (statusCode == HttpStatus.SC_OK) {
                //獲得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();
     }
    /**
      * 獲得網頁中的所有HTML內容
      * @param url
      * @param mapData:傳遞的參數
      * @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();
        // 填入各個表單域的值
         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")
                                 };
         */
        // 將表單的值放入postMethod中
         postMethod.setRequestBody(data);
        try {
            int statusCode = client.executeMethod(postMethod);
            if (statusCode == HttpStatus.SC_OK) {
                //獲得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);
     }
}

http://apache.freelamp.com/httpcomponents/commons-httpclient/binary/commons-httpclient-3.1.zip