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