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>