全部博文（2065）
分类： Java
2010-04-25 12:27:01
HttpClient示例代码
[作者：遥方 时间：
Demo1. GET一段URL并返回HTTP头部响应信息
package cn.ty.http;
import java.io.IOException;
import org.apache.commons.httpclient.*;
import org.apache.commons.httpclient.methods.*;
/**
* 最简单的HTTP客户端,用来演示通过GET或者POST方式访问某个页面
* @author Liudong
*/
public class SimpleClient {
public static void
main(String[] args) throws
IOException
{
HttpClient client = new
HttpClient();
//设置代理服务器地址和端口
//client.getHostConfiguration().setProxy("proxy_host_addr",proxy_port);
//使用GET方法，如果服务器需要通过HTTPS连接，那只需要将下面URL中的http换成https
HttpMethod method = new
GetMethod("");
//使用POST方法
//HttpMethod method = new PostMethod("");
client.executeMethod(method);
//打印服务器返回的状态
System.out.println(method.getStatusLine());
Header[] header = method.getResponseHeaders();
for (Header header2 :
header) {
System.out.println(header2);
} System.out.println(method.getResponseHeader("Content-Type").getValue());
//打印返回的信息
//System.out.println(method.getResponseBodyAsString());
//释放连接
method.releaseConnection();
}
}
Demo2. 模拟登录
package cn.ty.http;
import java.io.IOException;
import org.apache.commons.httpclient.*;
import
org.apache.commons.httpclient.cookie.CookiePolicy;
import
org.apache.commons.httpclient.cookie.CookieSpec;
import
org.apache.commons.httpclient.methods.*;
public class SimpleClient {
static
final String LOGON_SITE = "login.xxxx.xx";
static final int LOGON_PORT =
80;
public SimpleClient() {
super();
}
public static void main(String[] args) throws HttpException, IOException
{
HttpClient client = new HttpClient();
client.getHostConfiguration().setHost(LOGON_SITE, LOGON_PORT,
"http");
client.getParams().setCookiePolicy(CookiePolicy.BROWSER_COMPATIBILITY);
CookieSpec cookiespec = CookiePolicy.getDefaultSpec();
Cookie[] initcookies = cookiespec.match(LOGON_SITE, LOGON_PORT,
"/", false, client.getState().getCookies());
if (initcookies.length == 0) {
System.out.println("None");
} else {
for (int i = 0; i < initcookies.length; i++) {
System.out.println("-
" + initcookies[i].toString());
}
}
PostMethod authpost = new PostMethod("/user/xxxxxxxxx.asp");
NameValuePair action = new
NameValuePair("forwardURL", "");
NameValuePair url = new
NameValuePair("returnURL", "");
NameValuePair userid = new
NameValuePair("vwriter", "xxxx");
NameValuePair password = new NameValuePair("vpassword",
"xxxxxx");
authpost.setRequestBody(new NameValuePair[] {action, url, userid,
password});
client.executeMethod(authpost);
System.out.println("Login form post: " +
authpost.getStatusLine().toString());
authpost.releaseConnection();
//登录完了之后就可以查找看下是否有cookie值
Cookie[] logoncookies = cookiespec.match(LOGON_SITE, LOGON_PORT, "/",
false, client.getState().getCookies());
System.out.println("登录之后的 cookies:");
if (logoncookies.length == 0) {
System.out.println("None");
} else {
for (int i = 0; i < logoncookies.length; i++) {
System.out.println("-
" + logoncookies[i].toString());
}
}
//处理重定向的情况即30X
int statuscode = authpost.getStatusCode();
if ((statuscode == HttpStatus.SC_MOVED_TEMPORARILY) ||
(statuscode == HttpStatus.SC_MOVED_PERMANENTLY) ||
(statuscode == HttpStatus.SC_SEE_OTHER) ||
(statuscode == HttpStatus.SC_TEMPORARY_REDIRECT)) {
Header header = authpost.getResponseHeader("location");
if (header != null) {
String newuri =
header.getValue();
if ((newuri == null) ||
(newuri.equals(""))) {
newuri = "/";
}
System.out.println("Redirect target: " + newuri);
GetMethod redirect = new
GetMethod(newuri);
client.executeMethod(redirect);
System.out.println("Redirect: " +
redirect.getStatusLine().toString());
// release any connection
resources used by the method
System.out.println(redirect.getResponseBodyAsString());
redirect.releaseConnection();
} else {
System.out.println("Invalid redirect");
System.exit(1);
}
}
}
}
Demo3. 使用代理
package cn.ty.http;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.net.Socket;
import org.apache.commons.httpclient.*;
import
org.apache.commons.httpclient.auth.AuthScope;
import
org.apache.commons.httpclient.cookie.CookiePolicy;
import
org.apache.commons.httpclient.cookie.CookieSpec;
import
org.apache.commons.httpclient.methods.*;
public class SimpleClient {
public static void main(String[] args)
throws Exception {
ProxyClient proxyclient = new ProxyClient();
// set the host the proxy should create a connection to
//
// Note: By default port 80 will
be used. Some proxies only allow conections
// to ports 443 and 8443. This is
because the HTTP CONNECT method was intented
// to be used for tunneling HTTPS.
proxyclient.getHostConfiguration().setHost("");
// set the proxy host and port
proxyclient.getHostConfiguration().setProxy("119.62.128.38",
80);
// set the proxy credentials, only necessary for authenticating proxies
proxyclient.getState().setProxyCredentials(
new AuthScope("119.62.128.38", 80, null),
new UsernamePasswordCredentials("proxy", "proxy"));
// create the socket 连接到代理服务器
ProxyClient.ConnectResponse response = proxyclient.connect();
//表示连接成功了
if (response.getSocket() != null) {
Socket socket = response.getSocket();
try {
// go ahead and do an HTTP GET
using the socket
Writer out = new
OutputStreamWriter(socket.getOutputStream(), "ISO-8859-1");
out.write("POST
HTTP/1.1\r\n");
out.write("Host:
\r\n");
out.write("\r\n");
out.flush();
BufferedReader in = new
BufferedReader(
new
InputStreamReader(socket.getInputStream(), "gbk"));
String line = null;
while ((line = in.readLine())
!= null) {
System.out.println(line);
}
} finally {
// be sure to close the socket
when we're done
socket.close();
}
} else {
// the proxy connect was not successful, check connect method for
reasons why
System.out.println("Connect failed: " +
response.getConnectMethod().getStatusLine());
System.out.println(response.getConnectMethod().getResponseBodyAsString());
}
}
}
附：常用的代理服务器与端口列表
119.62.128.38:80 HTTP250,875,875云 南省 联通
"222.169.11.234", 8080
先用这两个吧。有时间再上网找找看有没有免费的代理服务器
