Android23_网络存储之HttpClient
来源:互联网 发布:中国货币供给量数据 编辑:程序博客网 时间:2024/06/08 17:54
- HttpClient:网络连接对象;
- HttpGet:代表发送GET请求;
- HttpPost:代表发送POST请求;
- HttpResponse:代表处理服务器响应的对象。
- HttpEntity对象:该对象中包含了服务器所有的返回内容。
- 创建HttpClient对象:通过实例化DefaultHttpClient获得;
- 创建HttpGet或HttpPost对象:通过实例化 HttpGet或HttpPost 获得,而构造方法的参数是urlstring(即需要访问的网络url地址)。也可以通过调用setParams()方法来添加请求参数;
- 调用HttpClient对象的execute()方法,参数是刚才创建的 HttpGet或HttpPost对象 ,返回值是HttpResponse对象;
- 通过response对象中的getStatusLine()方法和getStatusCode()方法获取服务器响应状态是否是200。
- 调用 HttpResponse对象的getEntity()方法,返回HttpEntity对象。而该对象中包含了服务器所有的返回内容。
- 借助EntityUtils的toString()方法或toByteArray()对 HttpEntity对象进行处理,也可以通过IO流对 HttpEntity对象进行操作。
public class HttpClientHelper {
public static HttpClient checkNetwork(String url) {
HttpClient httpClient = new DefaultHttpClient();
HttpGet request = new HttpGet(url);
HttpResponse httpResponse = null;
try {
httpResponse = httpClient.execute(request);
if (httpResponse.getStatusLine().getStatusCode() == 200) {
return httpClient;
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
/**
* 作用:实现网络访问文件,将获取到数据储存在文件流中
*
* @param url
* :访问网络的url地址
* @return inputstream
*/
public static InputStream loadFileFromURL(String url) {
HttpClient httpClient = new DefaultHttpClient();
HttpGet requestGet = new HttpGet(url);
HttpResponse httpResponse;
try {
httpResponse = httpClient.execute(requestGet);
if (httpResponse.getStatusLine().getStatusCode() == 200) {
HttpEntity entity = httpResponse.getEntity();
return entity.getContent();
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 作用:实现网络访问文件,将获取到的数据存在字节数组中
*
* @param url
* :访问网络的url地址
* @return byte[]
*/
public static byte[] loadByteFromURL(String url) {
HttpClient httpClient = new DefaultHttpClient();
HttpGet requestGet = new HttpGet(url);
try {
HttpResponse httpResponse = httpClient.execute(requestGet);
if (httpResponse.getStatusLine().getStatusCode() == 200) {
HttpEntity httpEntity = httpResponse.getEntity();
return EntityUtils.toByteArray(httpEntity);
}
} catch (Exception e) {
e.printStackTrace();
System.out.println("====>" + e.toString());
}
return null;
}
/**
* 作用:实现网络访问文件,返回字符串
*
* @param url
* :访问网络的url地址
* @return String
*/
public static String loadTextFromURL(String url) {
HttpClient httpClient = new DefaultHttpClient();
HttpGet requestGet = new HttpGet(url);
try {
HttpResponse httpResponse = httpClient.execute(requestGet);
if (httpResponse.getStatusLine().getStatusCode() == 200) {
HttpEntity httpEntity = httpResponse.getEntity();
return EntityUtils.toString(httpEntity, "utf-8");
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 作用:实现网络访问文件,先给服务器通过“GET”方式提交数据,再返回相应的数据
*
* @param url
* :访问网络的url地址
* @param params
* String url:访问url时,需要传递给服务器的参数。
* 第二个参数格式为:username=wangxiangjun&password=123456
* @return byte[]
*/
public static byte[] doGetSubmit(String url, String params) {
HttpClient httpClient = new DefaultHttpClient();
HttpGet requestGet = new HttpGet(url + "?" + params);
try {
HttpResponse httpResponse = httpClient.execute(requestGet);
if (httpResponse.getStatusLine().getStatusCode() == 200) {
HttpEntity httpEntity = httpResponse.getEntity();
return EntityUtils.toByteArray(httpEntity);
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 作用:实现网络访问文件,先给服务器通过“POST”方式提交数据,再返回相应的数据
*
* @param url
* :访问网络的url地址
* @param params
* String url:访问url时,需要传递给服务器的参数。 第二个参数为:List<NameValuePair>
* @return byte[]
*/
public static byte[] doPostSubmit(String url, List<NameValuePair> params) {
HttpClient httpClient = new DefaultHttpClient();
HttpPost requestPost = new HttpPost(url);
try {
requestPost.setEntity(new UrlEncodedFormEntity(params, "utf-8"));
HttpResponse httpResponse = httpClient.execute(requestPost);
if (httpResponse.getStatusLine().getStatusCode() == 200) {
HttpEntity httpEntity = httpResponse.getEntity();
return EntityUtils.toByteArray(httpEntity);
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* 作用:实现网络访问文件,先给服务器通过“POST”方式提交数据,再返回相应的数据
*
* @param url
* :访问网络的url地址
* @param params
* String url:访问url时,需要传递给服务器的参数。 Map<String , Object>
* @return byte[]
*/
public static byte[] doPostSubmit(String url, Map<String, Object> params) {
HttpClient httpClient = new DefaultHttpClient();
HttpPost requestPost = new HttpPost(url);
List<BasicNameValuePair> parameters = new ArrayList<BasicNameValuePair>();
try {
if (params != null) {
for (Map.Entry<String, Object> entry : params.entrySet()) {
String key = entry.getKey();
String value = entry.getValue().toString();
BasicNameValuePair nameValuePair = new BasicNameValuePair(
key, value);
parameters.add(nameValuePair);
}
}
requestPost
.setEntity(new UrlEncodedFormEntity(parameters, "utf-8"));
HttpResponse httpResponse = httpClient.execute(requestPost);
if (httpResponse.getStatusLine().getStatusCode() == 200) {
HttpEntity httpEntity = httpResponse.getEntity();
return EntityUtils.toByteArray(httpEntity);
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
注:
- Android23_网络存储之HttpClient
- Android23_网络存储之HttpClient
- 网络存储之HttpClient
- 网络请求之HttpClient
- 网络编程之HttpClient
- 网络访问之HttpClient
- 【网络爬虫】HttpClient抓取+解析+存储数据
- Android网络编程之httpclient
- Android网络优化之HttpClient
- Android网络优化之HttpClient
- Android网络优化之HttpClient
- Android网络优化之HttpClient
- Android网络优化之HttpClient
- Android网络优化之HttpClient
- Java网络通信之HttpClient
- Android网络编程之HttpClient
- Android网络优化之HttpClient
- Android网络优化之HttpClient
- 第十三周项目一--动物这样叫(2)
- Linux中find常见用法示例
- 数据结构- 堆
- GCC下载安装
- 重建数据库表所有索引
- Android23_网络存储之HttpClient
- 用脚本查看某库中每个表大小
- ios项目打包,安装流程
- Redis作者谈Redis应用场景
- 归并排序
- https://和http://区别
- 使用微信授权登录的APP,如何通过App Store审核?
- 常见6大错误--SAT改进句子题
- 文件系统