Java处理HTTP请求的相关代码详解编程语言

可以用于处理HTTP GET请求，POST请求，过滤HTML代码等

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操作辅助工具 
 * 
 * Get和Post两者在传递参数方式上有差异 
 * 
 * 1、Get: 把参数附加到url上，比如URL="http://www.abc.com?name=123&age=18" 
 * 2、Post：请求的url不变，但在content中加入参数，如 content="name=123&age=18",然后把content加入到post中 
 * 
 */ 
public class HttpTool { 
       
    /** 
     * GET请求数据 
     * @param get_url url地址 
     * @param content  key=value形式 
     * @return 返回结果 
     * @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(); 
            // 取得输入流，并使用Reader读取 
            reader = new BufferedReader(new InputStreamReader(connection 
                    .getInputStream(), "utf-8"));// 设置编码 
            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 返回结果 
     * @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 请求不能使用缓存 
            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将字符串中的16位的unicode字符变为utf-8的字符形式写道流里 
            //content = URLEncoder.encode(content, "utf-8"); 
               
            out.writeBytes(content); 
               
            /** 
             * 如果url中带有多个key-value参数对，则采用下面的方式写到content中 
             * 正文内容其实跟get的URL中'?'后的参数字符串一致 
             * 
            String content = 
                "name=" + URLEncoder.encode ("Hitesh Agrawal") + 
                "&profession=" + URLEncoder.encode ("Software Engineer"); 
            out.flush(); 
            out.close(); */ 
               
            //获取结果 
            reader = new BufferedReader(new InputStreamReader( 
                    connection.getInputStream(), "utf-8"));// 设置编码 
            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(); 
        } 
    } 
      
    /* 
     * 过滤掉html里不安全的标签，不允许用户输入这些符号 
     */ 
    public static String htmlFilter(String inputString) { 
        //return inputString; 
          String htmlStr = inputString; // 含html标签的字符串 
          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(""); // 过滤html标签 
   
           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(); 
        } 
    } 
}