String s1="1231dsdgasd的颯颯大";

Clob c = new SerialClob(s1.toCharArray());//String 轉 clob
Blob b = new SerialBlob(s1.getBytes("GBK"));//String 轉 blob
// 也可以這樣不傳字符集名稱，默認使用系統的
// Blob b = new SerialBlob(s1.getBytes());

String clobString = c.getSubString(1, (int) c.length());//clob 轉 String
String blobString = new String(b.getBytes(1, (int) b.length()),"GBK");//blob 轉 String
// 前面若沒傳入字符集名稱，則這裏也不需要傳入，以免出錯
// String blobString = new String(b.getBytes(1, (int) b.length()));

System.out.println(clobString);
System.out.println(blobString);package infohold.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

public class HttpRequestUtil {
static boolean proxySet = false;
static String proxyHost = "127.0.0.1";
static int proxyPort = 8087;

/**
* 編碼
*
* @param source
* @return
*/
public static String urlEncode(String source, String encode) {
String result = source;
try {
result = java.net.URLEncoder.encode(source, encode);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
return "0";
}
return result;
}

public static String urlEncodeGBK(String source) {
String result = source;
try {
result = java.net.URLEncoder.encode(source, "GBK");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
return "0";
}
return result;
}

/**
* 發起http請求獲取返回結果
*
* @param req_url
* 請求地址
* @return
*/
public static String httpRequest(String req_url) {
StringBuffer buffer = new StringBuffer();
try {
URL url = new URL(req_url);
HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();

httpUrlConn.setDoOutput(false);
httpUrlConn.setDoInput(true);
httpUrlConn.setUseCaches(false);

httpUrlConn.setRequestMethod("GET");
httpUrlConn.connect();

// 將返回的輸入流轉換成字符串
InputStream inputStream = httpUrlConn.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

String str = null;
while ((str = bufferedReader.readLine()) != null) {
buffer.append(str);
}
bufferedReader.close();
inputStreamReader.close();
// 釋放資源
inputStream.close();
inputStream = null;
httpUrlConn.disconnect();

} catch (Exception e) {
System.out.println(e.getStackTrace());
}
return buffer.toString();
}

/**
* 發送http請求取得返回的輸入流
*
* @param requestUrl
* 請求地址
* @return InputStream
*/
public static InputStream httpRequestIO(String requestUrl) {
InputStream inputStream = null;
try {
URL url = new URL(requestUrl);
HttpURLConnection httpUrlConn = (HttpURLConnection) url.openConnection();
httpUrlConn.setDoInput(true);
httpUrlConn.setRequestMethod("GET");
httpUrlConn.connect();
// 獲得返回的輸入流
inputStream = httpUrlConn.getInputStream();
} catch (Exception e) {
e.printStackTrace();
}
return inputStream;
}

/**
* 向指定URL發送GET方法的請求
*
* @param url
* 發送請求的URL
* @param param
* 請求參數，請求參數應該是 name1=value1&name2=value2 的形式。
* @return URL 所代表遠程資源的響應結果
*/
public static String sendGet(String url, String param) {
String result = "";
BufferedReader in = null;
try {
String urlNameString = url + "?" + param;
URL realUrl = new URL(urlNameString);
// 打開和URL之間的連接
URLConnection connection = realUrl.openConnection();
// 設置通用的請求屬性
connection.setRequestProperty("accept", "*/*");
connection.setRequestProperty("connection", "Keep-Alive");
connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
// 建立實際的連接
connection.connect();
// 獲取所有響應頭字段
Map<String, List<String>> map = connection.getHeaderFields();
// 遍歷所有的響應頭字段
for (String key : map.keySet()) {
System.out.println(key + "--->" + map.get(key));
}
// 定義 BufferedReader輸入流來讀取URL的響應
in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
System.out.println("發送GET請求出現異常！" + e);
e.printStackTrace();
}
// 使用finally塊來關閉輸入流
finally {
try {
if (in != null) {
in.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
}
return result;
}

/**
* 向指定 URL 發送POST方法的請求
*
* @param url
* 發送請求的 URL
* @param param
* 請求參數，請求參數應該是 name1=value1&name2=value2 的形式。
* @param isproxy
* 是否使用代理模式
* @return 所代表遠程資源的響應結果
*/
public static String sendPost(String url, String param, boolean isproxy) {
OutputStreamWriter out = null;
BufferedReader in = null;
String result = "";
try {
URL realUrl = new URL(url);
HttpURLConnection conn = null;
if (isproxy) {// 使用代理模式
@SuppressWarnings("static-access")
Proxy proxy = new Proxy(Proxy.Type.DIRECT.HTTP, new InetSocketAddress(proxyHost, proxyPort));
conn = (HttpURLConnection) realUrl.openConnection(proxy);
} else {
conn = (HttpURLConnection) realUrl.openConnection();
}
// 打開和URL之間的連接

// 發送POST請求必須設置如下兩行
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setRequestMethod("POST"); // POST方法

// 設置通用的請求屬性

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/x-www-form-urlencoded");

conn.connect();

// 獲取URLConnection對象對應的輸出流
out = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");
// 發送請求參數
out.write(param);
// flush輸出流的緩沖
out.flush();
// 定義BufferedReader輸入流來讀取URL的響應
in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
System.out.println("發送 POST 請求出現異常！" + e);
e.printStackTrace();
}
// 使用finally塊來關閉輸出流、輸入流
finally {
try {
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
return result;
}

public static void main(String[] args) {
// demo:代理訪問

String url = "http://api.adf.ly/api.php";
String para = "key=youkeyid&youuid=uid&advert_type=int&domain=adf.ly&url=http://somewebsite.com";

String sr = HttpRequestUtil.sendPost(url, para, true);
System.out.println(sr);
}

}

java http請求