Java處理HTTP請求的相關代碼

可以用于處理HTTP GET請求，POST請求，過濾HTML代碼等

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.regex.Pattern;
/**


Http操作輔助工具
*
Get和Post兩者在傳遞參數方式上有差異
*
1、Get: 把參數附加到url上，比如URL="http://www.abc.com?name=123&age=18"
2、Post：請求的url不變，但在content中加入參數，如 content="name=123&age=18",然后把content加入到post中
/
public class HttpTool {
/**

GET請求數據
@param get_url url地址
@param content  key=value形式
@return 返回結果
@throws Exception
*/
public String sendGetData(String get_url, String content) throws Exception {
 String result = "";
 URL getUrl = null;
 BufferedReader reader = null;
 String lines = "";
 HttpURLConnection connection = null;
 try {

 if (content != null && !content.equals(""))
     get_url = get_url + "?" + content;
     //get_url = get_url + "?" + URLEncoder.encode(content, "utf-8");
 getUrl = new URL(get_url);
 connection = (HttpURLConnection) getUrl.openConnection();
 connection.connect();
 // 取得輸入流，并使用Reader讀取
 reader = new BufferedReader(new InputStreamReader(connection
         .getInputStream(), "utf-8"));// 設置編碼
 while ((lines = reader.readLine()) != null) {
     result = result + lines;
 }
 return result;

} catch (Exception e) {

 throw e;

} finally {

 if (reader != null) {
     reader.close();
     reader = null;
 }
 connection.disconnect();

}
}
/**

@param POST_URL url地址
@param content  key=value形式
@return 返回結果
@throws Exception
*/
public String sendPostData(String POST_URL, String content)

 throws Exception {

HttpURLConnection connection=null;
 DataOutputStream out=null;
 BufferedReader reader=null;
 String line = "";
 String result="";
 try {

 URL postUrl = new URL(POST_URL);
 connection= (HttpURLConnection) postUrl.openConnection();
 connection.setDoOutput(true);//Let the run-time system (RTS) know that we want input
 connection.setDoInput(true);//we want to do output.
 connection.setRequestMethod("POST");           
 connection.setUseCaches(false);// Post 請求不能使用緩存
 connection.setInstanceFollowRedirects(true);
 connection.setRequestProperty("Content-Type",//Specify the header content type.
         "application/x-www-form-urlencoded");
 connection.connect();

 out = new DataOutputStream(connection.getOutputStream()); // Send POST output.

 // DataOutputStream.writeBytes將字符串中的16位的unicode字符變為utf-8的字符形式寫道流里
 //content = URLEncoder.encode(content, "utf-8");

 out.writeBytes(content);

 /**
  * 如果url中帶有多個key-value參數對，則采用下面的方式寫到content中
  * 正文內容其實跟get的URL中'?'后的參數字符串一致
  *
 String content =
     "name=" + URLEncoder.encode ("Hitesh Agrawal") +
     "&profession=" + URLEncoder.encode ("Software Engineer");
 out.flush();
 out.close(); */

 //獲取結果
 reader = new BufferedReader(new InputStreamReader(
         connection.getInputStream(), "utf-8"));// 設置編碼
 while ((line = reader.readLine()) != null) {
     result=result+line;
 }       
 return result;

} catch (Exception e) {

 throw e;

}finally
 {

 if(out!=null)
 {
     out.close();
     out=null;               
 }
 if(reader!=null)
 {
     reader.close();
     reader=null;               
 }
 connection.disconnect();

}
}
/*

過濾掉html里不安全的標簽，不允許用戶輸入這些符號
*/
public static String htmlFilter(String inputString) {
 //return inputString;
   String htmlStr = inputString; // 含html標簽的字符串
   String textStr = "";
   java.util.regex.Pattern p_script;
   java.util.regex.Matcher m_script;




      try {
       String regEx_script = "<[s]*?(script|style)[^>]*?>[sS]*?<[s]*?/[s]*?(script|style)[s]*?>";
       String regEx_onevent="on[^s]+=s*";
       String regEx_hrefjs="href=javascript:";
       String regEx_iframe="<[s]*?(iframe|frameset)[^>]*?>[sS]*?<[s]*?/[s]*?(iframe|frameset)[s]*?>";
       String regEx_link="<[s]*?link[^>]*?/>";

       htmlStr = Pattern.compile(regEx_script, Pattern.CASE_INSENSITIVE).matcher(htmlStr).replaceAll("");
       htmlStr=Pattern.compile(regEx_onevent, Pattern.CASE_INSENSITIVE).matcher(htmlStr).replaceAll("");
       htmlStr=Pattern.compile(regEx_hrefjs, Pattern.CASE_INSENSITIVE).matcher(htmlStr).replaceAll("");
       htmlStr=Pattern.compile(regEx_iframe, Pattern.CASE_INSENSITIVE).matcher(htmlStr).replaceAll("");
       htmlStr=Pattern.compile(regEx_link, Pattern.CASE_INSENSITIVE).matcher(htmlStr).replaceAll("");

       //p_html = Pattern.compile(regEx_html, Pattern.CASE_INSENSITIVE);
      // m_html = p_html.matcher(htmlStr);
      // htmlStr = m_html.replaceAll(""); // 過濾html標簽

       textStr = htmlStr;

      } catch (Exception e) {
       System.err.println("Html2Text: " + e.getMessage());
      }

      return textStr;
    }

public static void main(String[] args){
    HttpTool ht = new HttpTool();
    try {
        ht.sendGetData("http://www.baidu.com", "");
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

}</pre>