httpclient

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package test;

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

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.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;

/**

public class Authentication {

private static final String CONTENT_CHARSET = "GB2312";// httpclient读取内容时使用的字符集

/**
*
* 的到Http请求结果
*
* @param url请求地址
*
* @param parms请求参数
*
* @return
*
*/

public String getBody(String url, Map parms) {

String body = null;

// 构造HttpClient的实例

HttpClient httpClient = new HttpClient();

// 创建GET方法的实例

  PostMethod postMethod = new PostMethod(url);

  //httpClient.getParams().setParameter("http.protocol.content-charset", "UTF-8");
  //httpClient.getParams().setParameter(HTTP.CONTENT_ENCODING, "US-ASCII");

  //postMethod.addRequestHeader("Content-Type", "text/html; charset=UTF-8");
// postMethod.getParams().setContentCharset("GB2312");
  // 填入各个表单域的值

  NameValuePair[] data = new NameValuePair[parms.keySet().size()];
  Iterator it = parms.entrySet().iterator();

int i = 0;

  while (it.hasNext()) {
   Map.Entry entry = (Map.Entry) it.next();
   Object key = entry.getKey();
   Object value = entry.getValue();
   data[i] = new NameValuePair(key.toString(), value.toString());

i++;

}

//httpClient.getParams().setParameter(
// HttpMethodParams.HTTP_CONTENT_CHARSET, CONTENT_CHARSET);

// 将表单的值放入postMethod中

postMethod.setRequestBody(data);

try {

// 执行postMethod

int statusCode = httpClient.executeMethod(postMethod); // HttpClient对于要求接受后继服务的请求，象POST和PUT等不能自动处理转发

// 301或者302

//   if (statusCode == HttpStatus.SC_MOVED_PERMANENTLY
//     || statusCode == HttpStatus.SC_MOVED_TEMPORARILY) {
//
//    // 从头中取出转向的地址
//
//    Header locationHeader = postMethod
//      .getResponseHeader("location");
//
//    String location = null;
//
//    if (locationHeader != null) {
//     location = locationHeader.getValue();
//    // System.out
//    //   .println("The page was redirected to:" + location);
//
//    } else {
//
//    // System.err.println("Location field value is null.");
//
//    }
//
//   }
    //检查是否重定向

//       int statuscode = post.getStatusCode();
    GetMethod redirect = null;
         if ((statusCode == HttpStatus.SC_MOVED_TEMPORARILY) ||

(statusCode == HttpStatus.SC_MOVED_PERMANENTLY) ||

(statusCode == HttpStatus.SC_SEE_OTHER) ||

(statusCode == HttpStatus.SC_TEMPORARY_REDIRECT)) {

//读取新的URL地址
//System.out.println("Invalid redirect");
Header header = postMethod.getResponseHeader("location");

if (header != null) {

String newuri = header.getValue();

if ((newuri == null) || (newuri.equals("")))

                     newuri = "/";
                // System.out.println("Invalid redirect");

                  redirect = new GetMethod(newuri);
                 httpClient.executeMethod(redirect);

                // System.out.println("Redirect:"+ redirect.getResponseBodyAsString());
                // System.out.println("Invalid redirect");
               // redirect.releaseConnection();

} else

System.out.println("Invalid redirect");

}

   body = postMethod.getResponseBodyAsString();
   if(null==body){
    body=redirect.getResponseBodyAsString();
   }

} catch (Exception e) {

e.printStackTrace();

}

return body;

}

public String getURL(String url, Map parms) {

String body = null;

// 构造HttpClient的实例

HttpClient httpClient = new HttpClient();

// 创建GET方法的实例

int i = 0;

i++;

}

//httpClient.getParams().setParameter(
// HttpMethodParams.HTTP_CONTENT_CHARSET, CONTENT_CHARSET);

// 将表单的值放入postMethod中

postMethod.setRequestBody(data);

try {

// 执行postMethod

int statusCode = httpClient.executeMethod(postMethod); // HttpClient对于要求接受后继服务的请求，象POST和PUT等不能自动处理转发

// 301或者302

if (statusCode == HttpStatus.SC_MOVED_PERMANENTLY
|| statusCode == HttpStatus.SC_MOVED_TEMPORARILY) {

// 从头中取出转向的地址

Header locationHeader = postMethod
.getResponseHeader("location");

String location = null;

    if (locationHeader != null) {
     location = locationHeader.getValue();
     body=location;
    // System.out
    //   .println("The page was redirected to:" + location);

} else {

// System.err.println("Location field value is null.");

}

  // body = postMethod.getResponseBody();
  // body = postMethod.getResponseBody();
  } catch (Exception e) {

e.printStackTrace();

}

return body;

}

public static void main(String[] args) {

// String url = "http://localhost:8080/httpclienttest/test.xml";
String url = "http://localhost:8080/httpclienttest/";

  Map parms = new HashMap();
  parms.put("user", "yanbo");
  parms.put("pass", "1234");


  //parms.put("j_username", "admin");
  //parms.put("j_password", "admin123");

Authentication client = new Authentication();

String result = new String(client.getBody(url, parms));
System.out.println(result);

}
}