httpClient解决post请求重定向的问题

 import com.dadi.saas.util.HTTPUtils;
 import org.apache.commons.httpclient.Header;
 import org.apache.commons.httpclient.HttpClient;
 import org.apache.commons.httpclient.HttpStatus;
 import org.apache.commons.httpclient.NameValuePair;
 import org.apache.commons.httpclient.methods.PostMethod;

 import java.io.IOException;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.Map;

 /**
  * @author wdsy
  * @date 2017-06-21
  */

 public class HttpClientTest {

     public String getPostResponse(String url,  Map<String, String> parmMap ) throws IOException {
         {
             String result = "";
             PostMethod post = new PostMethod(url);
             HttpClient client = new HttpClient();
             Iterator it = parmMap.entrySet().iterator();
             NameValuePair[] param = new NameValuePair[parmMap.size()];
             int i = 0;
             while (it.hasNext()) {
                 Map.Entry parmEntry = (Map.Entry) it.next();
                 param[i++] = new NameValuePair((String) parmEntry.getKey(), (String) parmEntry.getValue());
             }

             post.setRequestBody(param);
             try {
                 int statusCode = client.executeMethod(post);

                 if (statusCode == HttpStatus.SC_MOVED_PERMANENTLY || statusCode == HttpStatus.SC_MOVED_TEMPORARILY) {
                     Header locationHeader = post.getResponseHeader("location");
                     String location = "";
                     if (locationHeader != null) {
                         location = locationHeader.getValue();
                         result = this.getPostResponse(location, parmMap);//用跳转后的页面重新请求�??
                     }
                 } else if (statusCode == HttpStatus.SC_OK) {
                     result = post.getResponseBodyAsString();
                 }
             } catch (IOException ex) {
             } finally {
                 post.releaseConnection();
             }
             return result;
         }
     }

     public static void main(String[] args) throws IOException {
         Map<String, String> map = new HashMap<String, String>();
         map.put("param1", "xxxx");
         map.put("param2", "xxxxx");
         map.put("param3", "xxxxx");
         Iterator it = map.entrySet().iterator();
         NameValuePair[] param = new NameValuePair[map.size()];
         int i = 0;
         String z =new HttpClientTest().getPostResponse("http://xxxx.xx.xx.xx:xxxx/xx/xx/xx.do?", map);
  System.out.println(z);
  } 
 }

pom：

 <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpasyncclient</artifactId>
            <version>4.0</version>
        </dependency>
        <dependency>
            <groupId>commons-httpclient</groupId>
            <artifactId>commons-httpclient</artifactId>
            <version>3.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
            <version>4.3.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpmime</artifactId>
            <version>4.3.1</version>
        </dependency>
        <dependency>
            <groupId>commons-configuration</groupId>
            <artifactId>commons-configuration</artifactId>
            <version>1.6</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.8-beta5</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.8</version>
        </dependency>