Android使用httpClient进行Post和Get发送参数 .

模拟发送Http请求我们可以使用HttpURLConnection类进行操作，但是Android平台集成了功能强大且编写更容易的commons-httpclient.jar，因此在这里介绍如何通过commons-httpclient进行Http请求。发送Http请求可以有两种方式：一种是同步，一种是异步。由于我对异步不是很熟悉，所以这里先提供同步方式发送Http请求：

1、使用Get方式发送

public String httpGet(String url, String params) throws Exception
    {
        String response = null; //返回信息
        if (null!=params&&!params.equals(""))
        {
            url += "?" + params;
        }
        // 构造HttpClient的实例
        HttpClient httpClient = new HttpClient();
        // 创建GET方法的实例
        GetMethod httpGet = new GetMethod(url);
        // 设置超时时间
        httpGet.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, new Integer(CONNECTION_TIMEOUT));
        try
        {
            int statusCode = httpClient.executeMethod(httpGet);
            if (statusCode == HttpStatus.SC_OK) //SC_OK = 200
            {
                InputStream inputStream = httpGet.getResponseBodyAsStream(); //获取输出流，流中包含服务器返回信息
                response = getData(inputStream);//获取返回信息
            }
            else
            {
                LOG.debug("Get Method Statuscode : "+statusCode);
            }
        } catch (Exception e)
        {
            throw new Exception(e);
        } finally
        {
            httpGet.releaseConnection();
            httpClient = null;
        }
        return response;
    }

public String httpGet(String url, String params) throws Exception 
    { 
        String response = null; //返回信息 
        if (null!=params&&!params.equals("")) 
        { 
            url += "?" + params; 
        } 
        // 构造HttpClient的实例 
        HttpClient httpClient = new HttpClient(); 
        // 创建GET方法的实例 
        GetMethod httpGet = new GetMethod(url); 
        // 设置超时时间 
        httpGet.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, new Integer(CONNECTION_TIMEOUT)); 
        try
        { 
            int statusCode = httpClient.executeMethod(httpGet); 
            if (statusCode == HttpStatus.SC_OK) //SC_OK = 200 
            { 
                InputStream inputStream = httpGet.getResponseBodyAsStream(); //获取输出流，流中包含服务器返回信息 
                response = getData(inputStream);//获取返回信息 
            } 
            else
            { 
                LOG.debug("Get Method Statuscode : "+statusCode); 
            } 
        } catch (Exception e) 
        { 
            throw new Exception(e); 
        } finally
        { 
            httpGet.releaseConnection(); 
            httpClient = null; 
        } 
        return response; 
    } 

 

2、使用Post方式发送

public String httpPost(String url, List<Parameter> params) throws Exception
    {
        String response = null;
        HttpClient httpClient = new HttpClient();
        PostMethod httpPost = new PostMethod(url);
        //Post方式我们需要配置参数
        httpPost.addParameter("Connection", "Keep-Alive");
        httpPost.addParameter("Charset", "UTF-8");
        httpPost.addParameter("Content-Type", "application/x-www-form-urlencoded");
        httpPost.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, new Integer(CONNECTION_TIMEOUT));
        if (null!=params&¶ms.size()!=0)
        {
            //设置需要传递的参数，NameValuePair[]
            httpPost.setRequestBody(buildNameValuePair(params));
        }
        try
        {
            int statusCode = httpClient.executeMethod(httpPost);
            if (statusCode == HttpStatus.SC_OK)
            {
                InputStream inputStream = httpPost.getResponseBodyAsStream();
                response = getData(inputStream);
            }
            else
            {
                LOG.debug("Post Method Statuscode : "+statusCode);
            }
        } catch (Exception e)
        {
            throw new Exception(e);
        } finally
        {
            httpPost.releaseConnection();
            httpClient = null;
        }
        return response;
    }

public String httpPost(String url, List<Parameter> params) throws Exception 
    { 
        String response = null; 
        HttpClient httpClient = new HttpClient(); 
        PostMethod httpPost = new PostMethod(url); 
        //Post方式我们需要配置参数 
        httpPost.addParameter("Connection", "Keep-Alive"); 
        httpPost.addParameter("Charset", "UTF-8"); 
        httpPost.addParameter("Content-Type", "application/x-www-form-urlencoded"); 
        httpPost.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, new Integer(CONNECTION_TIMEOUT)); 
        if (null!=params&¶ms.size()!=0) 
        { 
            //设置需要传递的参数，NameValuePair[] 
            httpPost.setRequestBody(buildNameValuePair(params)); 
        } 
        try
        { 
            int statusCode = httpClient.executeMethod(httpPost); 
            if (statusCode == HttpStatus.SC_OK) 
            { 
                InputStream inputStream = httpPost.getResponseBodyAsStream(); 
                response = getData(inputStream); 
            } 
            else
            { 
                LOG.debug("Post Method Statuscode : "+statusCode); 
            } 
        } catch (Exception e) 
        { 
            throw new Exception(e); 
        } finally
        { 
            httpPost.releaseConnection(); 
            httpClient = null; 
        } 
        return response; 
    } 

3、构件NameValuePair

private NameValuePair[] buildNameValuePair(List<Parameter> params)
    {
        int size = params.size();
        NameValuePair[] pair = new NameValuePair[size];
        for(int i = 0 ;i<size;i++)
        {
            Parameter param = params.get(i);
            pair[i] = new NameValuePair(param.getName(),param.getValue());
        }
        return pair;
    }

private NameValuePair[] buildNameValuePair(List<Parameter> params) 
    { 
        int size = params.size(); 
        NameValuePair[] pair = new NameValuePair[size]; 
        for(int i = 0 ;i<size;i++) 
        { 
            Parameter param = params.get(i); 
            pair[i] = new NameValuePair(param.getName(),param.getValue()); 
        } 
        return pair; 
    } 

4、获得返回数据

private String getData(InputStream inputStream) throws Exception
    {
        String data = "";
        //内存缓冲区
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        int len = -1;
        byte[] buff = new byte[1024];
        try
        {
            while((len=inputStream.read(buff))!=-1)
            {
                outputStream.write(buff, 0, len);
            }
            byte[] bytes = outputStream.toByteArray();
            data = new String(bytes);
        } catch (IOException e)
        {
            throw new Exception(e.getMessage(),e);
        }
        finally
        {
            outputStream.close();
        }
        return data;
    }