httpclient的get及post
需要的包有
httpclient-4.2.5.jar httpcore-4.2.4.jar
创建一个TestClient类（测试）
有get和post方法
public class TestClient {
HttpClient httpclient=new DefaultHttpClient();
/**
* 发送 post请求访问本地应用并根据传递参数不同返回不同结果
*/
public String post(String url,String respEncoding) {
return post(url,"UTF-8",respEncoding,new String());
}
/**
* 发送 post请求访问本地应用并根据传递参数不同返回不同结果
*/
public String post(String url,String reqEncoding,String respEncoding,String param) {
String resStr = "";
// 创建httppost
HttpPost httppost = new HttpPost(url);
// 请求超时
httpclient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 10000);
// 读取超时
httpclient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT, 10000);
// 创建参数队列
String[] a= param.split("\\&");
List list =new ArrayList();
for(int i=0;i<a.length;i++){
String[] b = a[i].split("\\=");
list.add(new BasicNameValuePair(b[0], b[1]));//参数
}
UrlEncodedFormEntity uefEntity;
try {
uefEntity = new UrlEncodedFormEntity(list, reqEncoding);
httppost.setEntity(uefEntity);
HttpResponse response;
response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
if (entity != null && response.getStatusLine().getStatusCode()==HttpStatus.SC_OK) {
resStr = EntityUtils.toString(entity,respEncoding);
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (UnsupportedEncodingException e1) {
e1.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
// 关闭连接,释放资源
//httpclient.getConnectionManager().shutdown();
}
return resStr;
}
/**
* 发送 get请求
*/
public String get(String url) {
//httpclient = new DefaultHttpClient();
String resStr = "";
try {
// 创建httpget.
HttpGet httpget = new HttpGet(url);
// 请求超时
httpclient.getParams().setParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, 10000);
// 读取超时
httpclient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT, 10000);
// 执行get请求.
HttpResponse response = httpclient.execute(httpget);
// 获取响应实体
HttpEntity entity = response.getEntity();
// 打印响应状态
System.out.println(response.getStatusLine());
if (entity != null) {
// 打印响应内容长度
// System.out.println("Response content length: "
// + entity.getContentLength());
// 打印响应内容
// System.out.println("Response content: "
// + EntityUtils.toString(entity));
resStr=EntityUtils.toString(entity);
}
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (ParseException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
// 关闭连接,释放资源
httpclient.getConnectionManager().shutdown();
}
return resStr;
}
}
创建一个MainClass类，调用httpclient类的方法
public class MainClass {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
TestClient http = new TestClient();//构造参数
List list =new ArrayList();
list.add(new BasicNameValuePair("username", "hty1"));//参数
System.out.println(http.post("http://localhost:8085/checkIntegralUsername.shtml", "UTF-8", "UTF-8", "username=hty1&mid=123456"));
System.out.println(http.get("http://localhost:8085/checkIntegralUsername.shtml"));//访问的页面
}
}
之前的使用java原生的http请求代码
public class TestHttp {
static Random random;
private static String table = "0123456789";
public static void main(String[] args) {
}
/**
* 向指定URL发送GET方法的请求
*
* @param url
* 发送请求的URL
* @param param
* 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
* @return URL 所代表远程资源的响应结果
*/
public static String sendGet(String url, String param) {
String result = "";
BufferedReader in = null;
String urlNameString="";
try {
urlNameString = url + "?" + param;
System.out.println(urlNameString+"---发送GET请求"+new Date());
URL realUrl = new URL(urlNameString);
// 打开和URL之间的连接
URLConnection connection = realUrl.openConnection();
// 设置通用的请求属性
connection.setRequestProperty("accept", "*/*");
connection.setRequestProperty("connection", "Keep-Alive");
connection
.setRequestProperty("User-Agent",
"Dalvik/1.6.0 (Linux; U; Android 4.2.2; GT-I9152 Build/JDQ39)");
connection.setReadTimeout(10000);
connection.setConnectTimeout(10000);
// 建立实际的连接
connection.connect();
// 获取所有响应头字段
Map<String, List<String>> map = connection.getHeaderFields();
// 遍历所有的响应头字段
for (String key : map.keySet()) {
System.out.println(key + "--->" + map.get(key));
}
// 定义 BufferedReader输入流来读取URL的响应
in = new BufferedReader(new InputStreamReader(connection
.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
System.out.println(urlNameString+"---发送GET请求出现异常！---"+new Date() + e);
try {
if (in != null) {
in.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
}
// 使用finally块来关闭输入流
finally {
try {
if (in != null) {
in.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
}
// System.out.println("---" + result);
return result;
}
/**
* 向指定 URL 发送POST方法的请求
*
* @param url
* 发送请求的 URL
* @param param
* 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
* @return 所代表远程资源的响应结果
*/
public static String sendPost(String url, String param) {
PrintWriter out = null;
BufferedReader in = null;
String result = "";
try {
URL realUrl = new URL(url);
// 打开和URL之间的连接
URLConnection conn = realUrl.openConnection();
// 设置通用的请求属性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setReadTimeout(10000);
conn.setConnectTimeout(10000);
// 获取URLConnection对象对应的输出流
OutputStreamWriter osw = new OutputStreamWriter(conn
.getOutputStream(),"UTF-8");
out = new PrintWriter(osw);
// 发送请求参数
out.print(param);
// flush输出流的缓冲
out.flush();
// 定义BufferedReader输入流来读取URL的响应
in = new BufferedReader(new InputStreamReader(
conn.getInputStream(), "UTF-8"));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
System.out.println("发送 POST 请求出现异常！" + e);
e.printStackTrace();
try {
if (in != null) {
in.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
}
// 使用finally块来关闭输出流、输入流
finally {
try {
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
// System.out.println(result);
return result;
}
private static String recordkey() {
String str = "150000911101112013082008-01-25 20:23:30testkey";
return MD5(str);
}
/**
* <Field128>MAC算法
*
* @param sourceStr
* @return
*/
private static String MD5(String sourceStr) {
String result = "";
try {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(sourceStr.getBytes());
byte b[] = md.digest();
int i;
StringBuffer buf = new StringBuffer("");
for (int offset = 0; offset < b.length; offset++) {
i = b[offset];
if (i < 0)
i += 256;
if (i < 16)
buf.append("0");
buf.append(Integer.toHexString(i));
}
result = buf.toString().substring(0, 16);
} catch (NoSuchAlgorithmException e) {
System.out.println(e);
}
return result;
}
}