java发送http的get、post请求

import org.apache.commons.httpclient.HttpClient; 
import org.apache.commons.httpclient.HttpMethod; 
import org.apache.commons.httpclient.HttpStatus; 
import org.apache.commons.httpclient.URIException; 
import org.apache.commons.httpclient.methods.GetMethod; 
import org.apache.commons.httpclient.methods.PostMethod; 
import org.apache.commons.httpclient.params.HttpMethodParams; 
import org.apache.commons.httpclient.util.URIUtil; 
import org.apache.commons.lang.StringUtils; 
import org.apache.commons.logging.Log; 
import org.apache.commons.logging.LogFactory; 

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStreamReader; 
import java.util.Map; 

/** 
* HTTP工具箱 
* 
* @author leizhimin 2009-6-19 16:36:18 
*/ 
public final class HttpTookit { 
        private static Log log = LogFactory.getLog(HttpTookit.class); 

        /** 
         * 执行一个HTTP GET请求，返回请求响应的HTML 
         * 
         * @param url                 请求的URL地址 
         * @param queryString 请求的查询参数,可以为null 
         * @param charset         字符集 
         * @param pretty            是否美化 
         * @return 返回请求响应的HTML 
         */ 
        public static String doGet(String url, String queryString, String charset, boolean pretty) { 
                StringBuffer response = new StringBuffer(); 
                HttpClient client = new HttpClient(); 
                HttpMethod method = new GetMethod(url); 
                try { 
                        if (StringUtils.isNotBlank(queryString)) 
                                //对get请求参数做了http请求默认编码，好像没有任何问题，汉字编码后，就成为%式样的字符串 
                                method.setQueryString(URIUtil.encodeQuery(queryString)); 
                        client.executeMethod(method); 
                        if (method.getStatusCode() == HttpStatus.SC_OK) { 
                                BufferedReader reader = new BufferedReader(new InputStreamReader(method.getResponseBodyAsStream(), charset)); 
                                String line; 
                                while ((line = reader.readLine()) != null) { 
                                        if (pretty) 
                                                response.append(line).append(System.getProperty("line.separator")); 
                                        else 
                                                response.append(line); 
                                } 
                                reader.close(); 
                        } 
                } catch (URIException e) { 
                        log.error("执行HTTP Get请求时，编码查询字符串“" + queryString + "”发生异常！", e); 
                } catch (IOException e) { 
                        log.error("执行HTTP Get请求" + url + "时，发生异常！", e); 
                } finally { 
                        method.releaseConnection(); 
                } 
                return response.toString(); 
        } 

        /** 
         * 执行一个HTTP POST请求，返回请求响应的HTML 
         * 
         * @param url         请求的URL地址 
         * @param params    请求的查询参数,可以为null 
         * @param charset 字符集 
         * @param pretty    是否美化 
         * @return 返回请求响应的HTML 
         */ 
        public static String doPost(String url, Map<String, String> params, String charset, boolean pretty) { 
                StringBuffer response = new StringBuffer(); 
                HttpClient client = new HttpClient(); 
                HttpMethod method = new PostMethod(url); 
                //设置Http Post数据 
                if (params != null) { 
                        HttpMethodParams p = new HttpMethodParams(); 
                        for (Map.Entry<String, String> entry : params.entrySet()) { 
                                p.setParameter(entry.getKey(), entry.getValue()); 
                        } 
                        method.setParams(p); 
                } 
                try { 
                        client.executeMethod(method); 
                        if (method.getStatusCode() == HttpStatus.SC_OK) { 
                                BufferedReader reader = new BufferedReader(new InputStreamReader(method.getResponseBodyAsStream(), charset)); 
                                String line; 
                                while ((line = reader.readLine()) != null) { 
                                        if (pretty) 
                                                response.append(line).append(System.getProperty("line.separator")); 
                                        else 
                                                response.append(line); 
                                } 
                                reader.close(); 
                        } 
                } catch (IOException e) { 
                        log.error("执行HTTP Post请求" + url + "时，发生异常！", e); 
                } finally { 
                        method.releaseConnection(); 
                } 
                return response.toString(); 
        } 

        public static void main(String[] args) { 
                String y = doGet("http://video.sina.com.cn/life/tips.html", null, "GBK", true); 
                System.out.println(y); 
        } 
}   其实，这里的美化加入系统平台无关的换行符，可以任何平台上正确显示换行。   另外发现，通过JDK自带类库实现的请求，往往在请求一些url时，无法获取到请求结果。但此工具总能保证只要你的浏览器能打开，它总能忠实的将响应的内容反馈回来。   另外，将查看Java平台环境的代码给出来，很常用！         public static void main(String[] args) { 
                Properties p = System.getProperties(); 
                for (Map.Entry<Object, Object> entry : p.entrySet()) { 
                        System.out.println(entry.getKey() + " = " + entry.getValue()); 
                } 
        }