Apache HttpClient访问网络工具类

package com.ztravel.utils;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.ParseException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

public class HttpClientUtils {

public static String sendHttpclientPost(String path,
Map<String, String> map, String encode) {
// TODO Auto-generated method stub
// 填充表单的内容
List<NameValuePair> pairs = new ArrayList<NameValuePair>();
// Key必须与action接收params的key一致
if (map != null && !map.isEmpty()) {
// 一个entry代表一个键值对，.getKey()获取键，getValue()获取值
for (Map.Entry<String, String> entry : map.entrySet()) {
pairs.add(new BasicNameValuePair(entry.getKey(), entry
.getValue()));
}
}
try {
// 添加form表单的内容，和网页的jsp一样
UrlEncodedFormEntity entity = new UrlEncodedFormEntity(pairs,
encode);
// 使用post提交数据
HttpPost httpPost = new HttpPost(path);
httpPost.setEntity(entity);
HttpClient httpClient = new DefaultHttpClient();
// HttpResponse获得服务器响应的所有消息
HttpResponse response = httpClient.execute(httpPost);
// 判断连接成功
if (response.getStatusLine().getStatusCode() == 200) {
// HttpEntity获得服务器响应回来的消息体(不包括HTTP HEAD)
HttpEntity httpEntity = response.getEntity();
// 自动分辨响应的内容的编码
String defaultCharset = EntityUtils
.getContentCharSet(httpEntity);
// EntityUtils.toString将获得的消息体转换成String
return EntityUtils.toString(httpEntity, defaultCharset);
}
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// 因为结果经常调用string的函数，所以没有返回null
return "";

}

public static String sendHttpclientGet(HttpClient httpClient, String path) {

try {// 利用HTTPGET 向服务器发起请求
// 如果URL连接过程中302重定向，则会自动跳转到新的页面
HttpGet get = new HttpGet(path);

// HttpResponse获得服务器响应的所有消息
HttpResponse response = httpClient.execute(get);

// HttpEntity获得服务器响应回来的消息体(不包括HTTP HEAD)
HttpEntity httpEntity = response.getEntity();

if (httpEntity != null) {// 获取消息体的内容
String defaultCharset = EntityUtils
.getContentCharSet(httpEntity);
// EntityUtils.toString将获得的消息体转换成String
return EntityUtils.toString(httpEntity, defaultCharset);
}

} catch (Exception e) {
}
return "";// 返回"",但不是空值
}

/**
* 从网络获取图片字节数组
* @param path
* @return
*/
public static byte[] getByteArrayByUrl(String path) {
byte[] data = null;
try {// 利用HTTPGET 向服务器发起请求
// 如果URL连接过程中302重定向，则会自动跳转到新的页面
HttpGet get = new HttpGet(path);

HttpClient httpClient=new DefaultHttpClient();;
// HttpResponse获得服务器响应的所有消息
HttpResponse response = httpClient.execute(get);

// HttpEntity获得服务器响应回来的消息体(不包括HTTP HEAD)
HttpEntity httpEntity = response.getEntity();

if (httpEntity != null) {// 获取消息体的内容
data = EntityUtils.toByteArray(httpEntity);
}

} catch (Exception e) {
}
return data;// 返回"",但不是空值
}
}