Question

如何使用HttpClient

Answer 1

httpClient使用举例：
HttpClient client = new HttpClient();
String url = ana/workFlowOaInterface.do?action=oaTask;
PostMethod postMethod = new PostMethod(url);
//设置参数编码为gbk
post.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET,"gbk");
//构造键值对参数
NameValuePair[] data = { new NameValuePair("processInstanceId", "230"), new NameValuePair("approveFlag", "1") };
// 把参数值放入postMethod中
postMethod.setRequestBody(data);
//执行
client.executeMethod(postMethod);
//读取内容
byte[] responseBody = postMethod.getResponseBody();
//处理内容
System.out.println(new String(responseBody));
System.out.println("getStatusLine:"+postMethod.getStatusLine());
System.out.println("~~~"+postMethod.getResponseBodyAsString());
System.out.println("statusCode:"+statusCode);
//打印结果页面
String response = new String(postMethod.getResponseBodyAsString().getBytes("utf-8"));
//打印返回的信息
System.out.println("response:"+response);
//释放连接
postMethod.releaseConnection();
如果传递的是中文参数，有可能会出现乱码，通过设置正确的参数编码来解决。

在被调用的接口方，直接通过request.getParameter的方式获取。

Answer 2

GET 方式

Java代码
//先将参数放入List，再对参数进行URL编码
List<BasicNameValuePair> params = new LinkedList<BasicNameValuePair>();
params.add(new BasicNameValuePair("param1", "中国"));
params.add(new BasicNameValuePair("param2", "value2"));

//对参数编码
String param = URLEncodedUtils.format(params, "UTF-8");

//baseUrl
String baseUrl = "http://ubs.free4lab.com/php/method.php";

//将URL与参数拼接
HttpGet getMethod = new HttpGet(baseUrl + "?" + param);

HttpClient httpClient = new DefaultHttpClient();

try {
HttpResponse response = httpClient.execute(getMethod); //发起GET请求

Log.i(TAG, "resCode = " + response.getStatusLine().getStatusCode()); //获取响应码
Log.i(TAG, "result = " + EntityUtils.toString(response.getEntity(), "utf-8"));//获取服务器响应内容
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

POST方式

Java代码
//和GET方式一样，先将参数放入List
params = new LinkedList<BasicNameValuePair>();
params.add(new BasicNameValuePair("param1", "Post方法"));
params.add(new BasicNameValuePair("param2", "第二个参数"));

try {
HttpPost postMethod = new HttpPost(baseUrl);
postMethod.setEntity(new UrlEncodedFormEntity(params, "utf-8")); //将参数填入POST Entity中

HttpResponse response = httpClient.execute(postMethod); //执行POST方法
Log.i(TAG, "resCode = " + response.getStatusLine().getStatusCode()); //获取响应码
Log.i(TAG, "result = " + EntityUtils.toString(response.getEntity(), "utf-8")); //获取响应内容

} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}