关于HttpUrlConnection用法
1.HttpRequestBase(HttpGet..)
HttpClient 支持多种访问网络的方式，包括GET, HEAD, POST, PUT, DELETE, TRACE and OPTIONS. 其对应子类为HttpGet, HttpHead, HttpPost, HttpPut, HttpDelete, HttpTrace, and HttpOptions.但在使用时多为HttpGet, HttpPost两种方式。
[java]
/**
* 一个简单的get请求
*/
private static void get() {
// 1.得到HttpClient对象
HttpClient httpClient = new DefaultHttpClient();
// 2.实例化一个HttpGet对象
HttpGet httpGet = new HttpGet("http://www.baidu.com");
try {
// 3.httpClient执行httpGet请求
HttpResponse response = httpClient.execute(httpGet);
HttpEntity entity = response.getEntity();
if (entity != null) { // 如果有数据表示请求成功
System.out.println(EntityUtils.toString(entity, "utf-8"));
} else {
System.out.println("连接失败！");
}
} catch (Exception e) {
e.printStackTrace();
} finally {
// 4.释放资源(Shuts down this connection manager and releases allocated
// resources)
httpClient.getConnectionManager().shutdown();
}
}
2.HttpResponse
通过得到HttpResponse对象，可以得到相关访问网络的信息，比如getEntity() getStatusLine()等等
[java]
System.out.println(response.getProtocolVersion());
System.out.println(response.getStatusLine().getStatusCode());
System.out.println(response.getStatusLine().getReasonPhrase());
System.out.println(response.getStatusLine().toString());
输出结果为
[java]
/*
HTTP/1.1
200
OK
HTTP/1.1 200 OK
*/
[java]
//得到请求的响应数据
//方式一.
HttpEntity entity = response.getEntity();
if (entity != null) { // 如果有数据表示请求成功
System.out.println(EntityUtils.toString(entity, "utf-8"));
} else {
System.out.println("连接失败！");
}
//方式二.
if(response.getStatusLine().getStatusCode() == 200){
HttpEntity myEntity = response.getEntity();
BufferedInputStream in = new BufferedInputStream(myEntity.getContent());
byte[] bytes = read(in);//通过自定义的read方法，取得该输入流对应的数据
}
3.ResponseHandler
[java]
/**
* 通过ResponseHandler处理请求
*/
private static void test() {
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet("http://www.baidu.com");
//自定义ResponseHandler对象
ResponseHandler<String> myHandler = new ResponseHandler<String>() {
@Override
public String handleResponse(HttpResponse response)
throws ClientProtocolException, IOException {
HttpEntity entity = response.getEntity();
String result = "连接失败！";
if (entity != null) { // 如果有数据表示请求成功
result = EntityUtils.toString(entity, "utf-8");
}
return result;
}
};
try {
String result = httpClient.execute(httpGet, myHandler);//接收该myHandler对象
System.out.println(result);
} catch (Exception e) {
e.printStackTrace();
} finally {
// 释放资源(Shuts down this connection manager and releases allocated resources)
httpClient.getConnectionManager().shutdown();
}
}
4.Post完成Form表单的提交
[java]
/**
* 完成form表单的提交
*/
private static void post() {
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost("http://127.0.0.1:8080/My/upload");
try {
// 为httpPost设置HttpEntity对象
List<NameValuePair> parameters = new ArrayList<NameValuePair>();
parameters.add(new BasicNameValuePair("username", "zhangsan"));
parameters.add(new BasicNameValuePair("password", "123321"));
HttpEntity entity = new UrlEncodedFormEntity(parameters);
httpPost.setEntity(entity);
// httpClient执行httpPost表单提交
HttpResponse response = httpClient.execute(httpPost);
// 得到服务器响应实体对象
HttpEntity responseEntity = response.getEntity();
if (responseEntity != null) {
System.out.println(EntityUtils
.toString(responseEntity, "utf-8"));
System.out.println("表单上传成功！");
} else {
System.out.println("服务器无响应！");
}
} catch (Exception e) {
e.printStackTrace();
} finally {
// 释放资源
httpClient.getConnectionManage
补充：移动开发 , Android ,
