Java如何使用HTTPclient访问url获得数据

/** 
 * 根据URL试用get方法取得返回的数据 
 * @param url 
 *        URL地址，参数直接挂在URL后面即可 
 * @return 
 */  
public static String getGetDateByUrl(String url){  
    String data = null;  
    //构造HttpClient的实例    
    HttpClient httpClient = new HttpClient();    
    //创建GET方法的实例    
    GetMethod getMethod = new GetMethod(url);   
    //设置头信息：如果不设置User-Agent可能会报405，导致取不到数据  
    getMethod.setRequestHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:39.0) Gecko/20100101 Firefox/39.0");  
    //使用系统提供的默认的恢复策略    
    getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler());    
    try{  
        //开始执行getMethod    
        int statusCode = httpClient.executeMethod(getMethod);  
        if (statusCode != HttpStatus.SC_OK) {  
            System.err.println("Method failed:" + getMethod.getStatusLine());  
        }  
        //读取内容  
        byte[] responseBody = getMethod.getResponseBody();  
        //处理内容  
        data = new String(responseBody);  
    }catch (HttpException e){  
        //发生异常，可能是协议不对或者返回的内容有问题  
        System.out.println("Please check your provided http address!");  
        data = "";  
        e.printStackTrace();  
    }catch(IOException e){  
        //发生网络异常  
        data = "";  
        e.printStackTrace();  
    }finally{  
        //释放连接  
        getMethod.releaseConnection();  
    }  
    return data;  
}  

/** 
 * 根据post方法取得返回数据 
 * @param url 
 *          URL地址 
 * @param array 
 *          需要以post形式提交的参数 
 * @return 
 */  
public static String getPostDateByUrl(String url,Map<String ,String> array){  
    String data = null;  
    //构造HttpClient的实例    
    HttpClient httpClient = new HttpClient();    
    //创建post方法的实例    
    PostMethod postMethod = new PostMethod(url);   
    //设置头信息  
    postMethod.setRequestHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:39.0) Gecko/20100101 Firefox/39.0");  
    postMethod.addRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=utf-8");  
    //遍历设置要提交的参数  
    Iterator it = array.entrySet().iterator();    
    while (it.hasNext()){  
        Map.Entry<String,String> entry =(Map.Entry) it.next();    
        String key = entry.getKey();    
        String valu<div style="color:transparent">本文来源gaodai.ma#com搞##代!^码@网*</div>e = entry.getValue().trim();    
        postMethod.setParameter(key,value);  
    }  
    //使用系统提供的默认的恢复策略    
    postMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler());    
    try{  
        //执行postMethod    
        int statusCode = httpClient.executeMethod(postMethod);  
        if (statusCode != HttpStatus.SC_OK) {  
            System.err.println("Method failed:" + postMethod.getStatusLine());  
        }  
        //读取内容  
        byte[] responseBody = postMethod.getResponseBody();  
        //处理内容  
        data = new String(responseBody);  
    }catch (HttpException e){  
        //发生致命的异常，可能是协议不对或者返回的内容有问题  
        System.out.println("Please check your provided http address!");  
        data = "";  
        e.printStackTrace();  
    }catch(IOException e){  
        //发生网络异常  
        data = "";  
        e.printStackTrace();  
    }finally{  
        //释放连接  
        postMethod.releaseConnection();  
    }  
    System.out.println(data);  
    return data;  
}