java发送http的get、post请求

package com.ruanwei.tool;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

/**
* <p>
* <date>2012-03-01</date><br/>
*
* <span>----------基础访问方法-------------</span>
* </p>
*
* @author LIP
* @version 1.0.1
*/
public class SmsClientAccessTool {

private static SmsClientAccessTool smsClientToolInstance;

/**
* 采用单列方式来访问操作
*
* @return
*/
public static synchronized SmsClientAccessTool getInstance() {

if (smsClientToolInstance == null) {
smsClientToolInstance = new SmsClientAccessTool();
}
return smsClientToolInstance;
}

/**
* <p>
* POST方法
* </p>
*
* @param sendUrl
*            ：访问URL
* @param paramStr
*            ：参数串
* @param backEncod
4000
Type
*            ：返回的编码
* @return
*/
public String doAccessHTTPPost(String sendUrl, String sendParam,
String backEncodType) {

StringBuffer receive = new StringBuffer();
BufferedWriter wr = null;
try {
if (backEncodType == null || backEncodType.equals("")) {
backEncodType = "UTF-8";
}

URL url = new URL(sendUrl);
HttpURLConnection URLConn = (HttpURLConnection) url
.openConnection();

URLConn.setDoOutput(true);
URLConn.setDoInput(true);
((HttpURLConnection) URLConn).setRequestMethod("POST");
URLConn.setUseCaches(false);
URLConn.setAllowUserInteraction(true);
HttpURLConnection.setFollowRedirects(true);
URLConn.setInstanceFollowRedirects(true);

URLConn.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded;charset=UTF-8");
URLConn.setRequestProperty("Content-Length", String
.valueOf(sendParam.getBytes().length));

DataOutputStream dos = new DataOutputStream(URLConn
.getOutputStream());
dos.writeBytes(sendParam);

BufferedReader rd = new BufferedReader(new InputStreamReader(
URLConn.getInputStream(), backEncodType));
String line;
while ((line = rd.readLine()) != null) {
receive.append(line).append("\r\n");
}
rd.close();
} catch (java.io.IOException e) {
receive.append("访问产生了异常-->").append(e.getMessage());
e.printStackTrace();
} finally {
if (wr != null) {
try {
wr.close();
} catch (IOException ex) {
ex.printStackTrace();
}
wr = null;
}
}

return receive.toString();
}

public String doAccessHTTPGet(String sendUrl, String backEncodType) {

StringBuffer receive = new StringBuffer();
BufferedReader in = null;
try {
if (backEncodType == null || backEncodType.equals("")) {
backEncodType = "UTF-8";
}

URL url = new URL(sendUrl);
HttpURLConnection URLConn = (HttpURLConnection) url
.openConnection();

URLConn.setDoInput(true);
URLConn.setDoOutput(true);
URLConn.connect();
URLConn.getOutputStream().flush();
in = new BufferedReader(new InputStreamReader(URLConn
.getInputStream(), backEncodType));

String line;
while ((line = in.readLine()) != null) {
receive.append(line).append("\r\n");
}

} catch (IOException e) {
receive.append("访问产生了异常-->").append(e.getMessage());
e.printStackTrace();
} finally {
if (in != null) {
try {
in.close();
} catch (java.io.IOException ex) {
ex.printStackTrace();
}
in = null;

}
}

return receive.toString();
}
}

调用：
SmsClientAccessTool.getInstance().doAccessHTTPPost(url,sendParam.toString(), "UTF-8");