HttpClient使用

1、Get/Post

public static void main(String[] args) {
HttpClient client = new HttpClient();
GetMethod getMethod = null;
try {
getMethod = new GetMethod("http://10.20.136.25/versionData.htm");
int statusCode = client.executeMethod(getMethod);

if (statusCode == 200) {
String body = getMethod.getResponseBodyAsString();
String[] cacheFiles = body.split("\\|");
for (String cacheFile : cacheFiles) {
String[] pairs = cacheFile.split("=");
//one and only one pair
String filename = pairs[0];
String indicateNumber = pairs[1];
System.out.println("file:" + filename + ", md5:"
+ indicateNumber.split("\\.")[0] + ", dependency md5:"
+ indicateNumber.split("\\.")[1]);
}
}
} catch (HttpException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (getMethod != null) {
getMethod.releaseConnection();
}
}
}

2.https

如何支持https?

java 代码

static{

Protocol easyhttps = new Protocol("https", new EasySSLProtocolSocketFactory(), 443);

Protocol.registerProtocol("https", easyhttps);

}

在执行具体的http method之前，将https协议注册一把

3.cookies

java 代码

HttpClient httpclient=new HttpClient();

httpclient.getParams().setCookiePolicy(CookiePolicy.RFC_2109);//RFC_2109是支持较普遍的一个，还有其他cookie协议

HttpState initialState = new HttpState();

Cookie cookie=new Cookie();

cookie.setDomain("www.balblabla.com");

cookie.setPath("/");

cookie.setName("多情环");

cookie.setValue("多情即无情");

initialState.addCookie(cookie);

httpclient.setState(initialState);

...

4.解构cookies

java 代码

...//执行了某些get/post方法后

Cookie[] cookies = httpclient.getState().getCookies();

System.out.println("Present cookies: ");

for (int i = 0; i < cookies.length; i++) {//循环结构零部件

System.out.println(" - " + cookies[i].toExternalForm());

System.out.println(" - domain=" + cookies[i].getDomain());

System.out.println(" - path=" + cookies[i].getPath());

...

}

5.post参数

post方法在提交参数对时：

java 代码

PostMethod postMethod = new PostMethod("http://www.saybot.com/postme");

NameValuePair[] postData = new NameValuePair[2];

postData[0] = new NameValuePair("武器", "枪");

postData[1] = new NameValuePair("什么枪", "神枪");

postMethod.addParameters(postData);

...//出枪吧

6.代理(proxy)

代理，非常重要，尤其在局域网横行的年头，没有代理，你在公司上不了QQ，没有代理，google不了网页快照，代理之威，可比七星碧玉刀，无刀，在局域网和开发当中，一切白搭：

java 代码

HttpClient httpclient=new HttpClient();

httpClient.getHostConfiguration().setProxy("192.168.0.1", 9527);

httpClient.getParams().setAuthenticationPreemptive(true);//重要！！！告诉httpclient，使用抢先认证，否则你会收到“你没有资格”的恶果

/*

这一步也至关重要，MyProxyCredentialsProvider实现了org.apache.commons.httpclient.auth.CredentialsProvider接口，

返回代理的credential(username/password)*/

httpClient.getParams().setParameter(CredentialsProvider.PROVIDER, new MyProxyCredentialsProvider());

httpClient.getState().setProxyCredentials(

new AuthScope("192.168.0.1",

AuthScope.ANY_PORT, //任意端口哦，可要小心

AuthScope.ANY_REALM),//任意域哦，可要小心

new UsernamePasswordCredentials("username",//proxy的用户名

"password"));//proxy的密码

7.

看httpclient的官方文档：jakarta.apache.org/commons/httpclient/userguide.html

看Hilton网友写的小葵花宝典笔记：www.cnjm.net/tech/article1155.html