Java httpclient 4.1如何使用可配置端口发送post请求

问题描述

哇，我找不到任何正常工作的httpclient 4.1示例，用非默认端口
发送帖子请求但可配置端口，我有这个代码但是它不能正常工作

  // lHashMapParams与params获取表单功能.. 
 
 List< BasicNameValuePair> params = new ArrayList< BasicNameValuePair>（）; 
 for（String key：lHashMapParams.keySet（））{
 String val = lHashMapParams.get（key）; 
 params.add（new BasicNameValuePair（key，val））; 
 
} 
 String url =https://foo.com; 
 int port = 8883; 
 String =https; 
 UrlEncodedFormEntity query = new UrlEncodedFormEntity（params）; 
 HttpHost httpHost = new HttpHost（url，port，httpType）; 
 
 HttpPost post = new HttpPost（/）; 
 post.setEntity（query）; 
 
 
 HttpResponse response_ = httpclient.execute（httpHost，post）; 
  

获得此例外：

  log4j：WARN请正确初始化log4j系统。 
 java.net.UnknownHostException：https：//foo.com 
 at java.net.Inet4AddressImpl.lookupAllHostAddr（Native Method）
 at java.net.InetAddress $ 1.lookupAllHostAddr（InetAddress.java ：849）
 at java.net.InetAddress.getAddressFromNameService（InetAddress.java:1183）
 at java.net.InetAddress.getAllByName0（InetAddress.java:1136）
 at java.net。 InetAddress.getAllByName0（InetAddress.java:1109）
 at java.net.InetAddress.getAllByName（InetAddress.java:1072）
 at org.apache.http.impl.conn.DefaultClientConnectionOperator.resolveHostname（DefaultClientConnectionOperator。 java：242）
 at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection（DefaultClientConnectionOperator.java:130）
 at org.apache.http.impl.conn.AbstractPoolEntry.open（AbstractPoolEntry。 java：149）
 at org.apache.http.impl.conn.AbstractPooledConnAdapter.open（AbstractPooledConnAdapter.java:121）
 at org.apache.http.impl.client.DefaultRequestDirector .tryConnect（DefaultRequestDirector.java:561）
 at org.apache.http.impl.client.DefaultRequestDirector.execute（DefaultRequestDirector.java:415）
 at org.apache.http.impl.client.AbstractHttpClient .execute（AbstractHttpClient.java:820）
 at org.apache.http.impl.client.AbstractHttpClient.execute（AbstractHttpClient.java:776）
 at com.ut.HttpClientImpl.postHttpReqest（HttpClientImpl.java） ：75）
  

简单的话是如何定义端口的？

解决方案

您正在尝试执行主机名的查找 https://foo.com
这就是问题所在;查找应该是针对 foo.com 。我不确定你是如何得到有问题的代码的，但是值得一些时间来看看。

如果我没错，下面的代码应该是足够：

  HttpPost httpost = new HttpPost（url）; //构造完整的URL，即发布到
 httpost.setEntity（entity）的动作; 
 response = httpclient.execute（httpost）; 
  

其中url将使用http / https架构，主机名，端口和其余部分构建资源URI。

wow , i just can't find any working httpclient 4.1 example , to send post request with Not default portbut configurable port , i have this code but its dosn't work

// lHashMapParams is with params getting form function ..

List<BasicNameValuePair> params = new ArrayList<BasicNameValuePair>();
        for (String key : lHashMapParams.keySet()) {
            String val = lHashMapParams.get(key);
            params.add(new BasicNameValuePair(key,val));

}
String url = "https://foo.com";
int port = 8883;
String = "https";
UrlEncodedFormEntity query = new UrlEncodedFormEntity(params);
        HttpHost httpHost = new HttpHost(url,port,httpType);

        HttpPost post = new HttpPost("/");
        post.setEntity(query);


        HttpResponse response_ = httpclient.execute(httpHost,post);

getting this exception :

log4j:WARN Please initialize the log4j system properly.
java.net.UnknownHostException: https://foo.com
    at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
    at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:849)
    at java.net.InetAddress.getAddressFromNameService(InetAddress.java:1183)
    at java.net.InetAddress.getAllByName0(InetAddress.java:1136)
    at java.net.InetAddress.getAllByName0(InetAddress.java:1109)
    at java.net.InetAddress.getAllByName(InetAddress.java:1072)
    at org.apache.http.impl.conn.DefaultClientConnectionOperator.resolveHostname(DefaultClientConnectionOperator.java:242)
    at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:130)
    at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:149)
    at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:121)
    at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:561)
    at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:415)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:820)
    at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:776)
    at com.ut.HttpClientImpl.postHttpReqest(HttpClientImpl.java:75)

is simple words how to define port ?

解决方案

You are attempting to perform a lookup of the host name https://foo.com and that's the problem; the lookup should have been against foo.com. I'm not sure as to how you've arrived at the code in question, but it would be worth some time to take a look at the HttpClient tutorial.

If I'm not wrong, the following code, should be sufficient:

HttpPost httpost = new HttpPost(url); //construct the complete URL i.e. action to post to
httpost.setEntity(entity);
response = httpclient.execute(httpost);

where url is to be constructed with the http/https schema, host name, port and the rest of the resource URI.

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