HttpClientUtil工具类

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.Enumeration;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;


import javax.servlet.ServletRequest;


import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.Validate;




public class HttpClientUtil {
/**
* 向指定URL发送GET方法的请求
* 
* @param url
*            发送请求的URL
* @param param
*            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
* @return URL 所代表远程资源的响应结果
*/
public static String sendGet(String url, String param,String encode) {
String result = "";
BufferedReader in = null;
try {
String urlNameString = url + "?" + param;
URL realUrl = new URL(urlNameString);
// 打开和URL之间的连接
URLConnection connection = realUrl.openConnection();
// // 设置通用的请求属性
// connection.setRequestProperty("accept", "*/*");
// connection.setRequestProperty("connection", "Keep-Alive");
// connection.setRequestProperty("user-agent",
// "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");


// connection.setRequestProperty("email","***");//"***"是用户名
// connection.setRequestProperty("password","***");//"***"是密码


// 建立实际的连接
connection.connect();
// 获取所有响应头字段
Map> map = connection.getHeaderFields();
// 遍历所有的响应头字段
/*for (String key : map.keySet()) {
System.out.println(key + "--->" + map.get(key));
}*/
// 定义 BufferedReader输入流来读取URL的响应
in = new BufferedReader(new InputStreamReader(
connection.getInputStream(),encode));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
System.out.println("发送GET请求出现异常！" + e);
e.printStackTrace();
}
// 使用finally块来关闭输入流
finally {
try {
if (in != null) {
in.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
}
return result;
}


/**
* 向指定 URL 发送POST方法的请求
* 
* @param url
*            发送请求的 URL
* @param param
*            请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
* @return 所代表远程资源的响应结果
* @throws Exception 
*/
public static String sendPost(String url, String param,String encode) throws Exception {
PrintWriter out = null;
BufferedReader in = null;
String result = "";
try {
URL realUrl = new URL(url);
// 打开和URL之间的连接
URLConnection conn = realUrl.openConnection();
conn.setConnectTimeout(10000);
conn.setReadTimeout(10000);
// 设置通用的请求属性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
// 发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
// 获取URLConnection对象对应的输出流
out = new PrintWriter(conn.getOutputStream());
// 发送请求参数
out.print(param);
// flush输出流的缓冲
out.flush();
// 定义BufferedReader输入流来读取URL的响应
in = new BufferedReader(
new InputStreamReader(conn.getInputStream(),encode));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
System.out.println("发送 POST 请求出现异常！" + e);
e.printStackTrace();
throw e;
}
// 使用finally块来关闭输出流、输入流
finally {
try {
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
return result;
}


/**
* get Remote Json String
* 
* @param remoteUrl
* @param queryString
* @param encoding
* @return
* @throws IOException
* @author cuilei
*/
public static String getRemoteJson(String remoteUrl, String queryString,
String encoding) throws IOException {


long start = System.currentTimeMillis();


String retStr = null;
URL url = null;
HttpURLConnection conn = null;
InputStream in = null;
BufferedReader reader = null;
try {
url = new URL(remoteUrl);
if (queryString != null) {
if (url.getQuery() == null) {
url = new URL(remoteUrl + "?" + queryString);
} else {
url = new URL(remoteUrl + "&" + queryString);
}
}
conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(10000);
conn.setReadTimeout(10000);
conn.setDefaultUseCaches(false);
conn.setUseCaches(false);
conn.setDoOutput(true);
in = conn.getInputStream();
reader = new BufferedReader(new InputStreamReader(in, encoding));
StringBuffer buffer = new StringBuffer();
String line = null;
while ((line = reader.readLine()) != null) {
buffer.append(line);
}
retStr = buffer.toString();
} catch (IOException ioexception) {
throw ioexception;
} finally {
try {
if (reader != null)
reader.close();
} catch (Exception ex) {
}
try {
if (in != null)
in.close();
} catch (Exception ex) {
}
try {
if (conn != null)
conn.disconnect();
} catch (Exception ex) {
}
}


long end = System.currentTimeMillis();


return retStr;

}

/**
 * 可用户获取图片、视频等流文件
 */

public static InputStream getRemoteJson2(String remoteUrl, String queryString,
String encoding) throws IOException {


long start = System.currentTimeMillis();


String retStr = null;
URL url = null;
HttpURLConnection conn = null;
InputStream in = null;
BufferedReader reader = null;
try {
url = new URL(remoteUrl);
if (queryString != null) {
if (url.getQuery() == null) {
url = new URL(remoteUrl + "?" + queryString);
} else {
url = new URL(remoteUrl + "&" + queryString);
}
}
conn = (HttpURLConnection) url.openConnection();
conn.setDefaultUseCaches(false);
conn.setUseCaches(false);
conn.setDoOutput(true);
in = conn.getInputStream();
} catch (IOException ioexception) {
throw ioexception;
}/* finally {
try {
if (reader != null)
reader.close();
} catch (Exception ex) {
}
try {
if (conn != null)
conn.disconnect();
} catch (Exception ex) {
}
}*/


long end = System.currentTimeMillis();


return in;
}
public static Map getParametersStartingWith(ServletRequest request, String prefix) {
Validate.notNull(request, "Request must not be null");
Enumeration paramNames = request.getParameterNames();
Map params = new TreeMap();
if (prefix == null) {
prefix = "";
}
while ((paramNames != null) && paramNames.hasMoreElements()) {
String paramName = (String) paramNames.nextElement();
if ("".equals(prefix) || paramName.startsWith(prefix)) {
String unprefixed = paramName.substring(prefix.length());
String[] values = request.getParameterValues(paramName);
if ((values == null) || (values.length == 0)) {
// Do nothing, no values found at all.
} else if (values.length > 1) {
params.put(unprefixed, values);
} else {
params.put(unprefixed, values[0]);
}
}
}
return params;
}


public static String postTest(String url,String word,String fileUrl,Integer curPage,Integer numPerPage, byte[] bt) throws Exception {
BufferedReader in = null;
OutputStream outStrm = null;
String result = "";
try {
URL realUrl = new URL(url);
// 打开和URL之间的连接
HttpURLConnection conn = (HttpURLConnection)realUrl.openConnection();
// 设置通用的请求属性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
// conn.setRequestProperty("content-type", "application/octet-stream");
if(StringUtils.isNotBlank(word))conn.setRequestProperty("word",java.net.URLEncoder.encode(word,"utf-8")); //文本关键字
if(StringUtils.isNotBlank(fileUrl))conn.setRequestProperty("url",fileUrl); //图片位置url

conn.setRequestProperty("curPage",curPage+"");
conn.setRequestProperty("numPerPage",numPerPage+"");

// 发送POST请求必须设置如下两行
// 设置是否向conn输出，因为这个是post请求，参数要放在 http正文内，因此需要设为true, 默认情况下是false;
conn.setDoOutput(true);
// 设置是否从conn读入，默认情况下是true; 
conn.setDoInput(true);

conn.setUseCaches(false);// POST 请求不能使用缓存 
conn.setRequestMethod("POST");
// 获取URLConnection对象对应的输出流,此处getOutputStream会隐含的进行connect
outStrm = conn.getOutputStream();

// 向对象输出流写出数据，这些数据将存到内存缓冲区中
// outStrm.write(bt, 0, bt.length); 
outStrm.flush();


// 调用HttpURLConnection连接对象的getInputStream()函数, 将内存缓冲区中封装好的完整的HTTP请求电文发送到服务端
in = new BufferedReader(
new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
System.out.println("发送 POST 请求出现异常！" + e);
e.printStackTrace();
throw e;
}
// 使用finally块来关闭输出流、输入流
finally {
try {
if(outStrm != null){
outStrm.close(); 
}
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
return result;
}

/**
* 根据地址获取图片并保存到临时路径path
*
*/
public static void sendGetTest(String url, String param ,String path) {
String result = "";
InputStream in = null;
File outFile = new File(path);
FileOutputStream os = null ; 
try {
String urlNameString = url + "?" + param;
URL realUrl = new URL(urlNameString);
// 打开和URL之间的连接
URLConnection connection = realUrl.openConnection();
// // 设置通用的请求属性
// connection.setRequestProperty("accept", "*/*");
// connection.setRequestProperty("connection", "Keep-Alive");
// connection.setRequestProperty("user-agent",
// "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");


// connection.setRequestProperty("email","***");//"***"是用户名
// connection.setRequestProperty("password","***");//"***"是密码


// 建立实际的连接
connection.connect();
// 获取所有响应头字段
Map> map = connection.getHeaderFields();
// 遍历所有的响应头字段
/*for (String key : map.keySet()) {
System.out.println(key + "--->" + map.get(key));
}*/
// 定义 BufferedReader输入流来读取URL的响应
in = connection.getInputStream();
byte[] inOutb = new byte[in.available()];
in.read(inOutb);  //读入流,保存在byte数组
os = new FileOutputStream(outFile);
os.write(inOutb);  //写出流,保存在文件newFace.gif中

} catch (Exception e) {
System.out.println("发送GET请求出现异常！" + e);
e.printStackTrace();
}
// 使用finally块来关闭输入流
finally {
try {
if (in != null) {
in.close();
}
if(os != null){
os.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
}

}
}