java 实现ajax发送http请求，直接访问服务器

 //-----------------------------客户端请求时需要把中文转码 ---------------------

   /** 

     * 向指定URL发送POST方法的请求 

     *@paramurl 发送请求的URL 

     *@returnURL所代表远程资源的响应 

     */ 

   publicstaticString sendPost(Stringurl, Stringparam) { 

      OutputStreamWriterout= null;

         BufferedReaderin= null;

         Stringresult= "";

        try{

             URLrealUrl= new URL(url);

            // 打开和URL之间的连接

             URLConnectionconn= 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)");

            // 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 OutputStreamWriter(conn.getOutputStream(),"UTF-8");

            // 发送请求参数

            out.write(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(

                    newInputStreamReader(conn.getInputStream()));

             Stringline;

            while((line= in.readLine()) !=null) {

                result+= line;

             }

         }catch(Exceptione) {

             System.out.println("发送 POST 请求出现异常！"+e);

            e.printStackTrace();

         }

        //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(IOExceptionex){

                ex.printStackTrace();

             }

         }

        returnresult;

     }   

 

   //提供主方法，测试发送POST请求 

   publicstaticvoidmain(Stringargs[])throwsNoSuchAlgorithmException, IOException { 

         //文章标题

        Stringtitle="测试title";

       

       //发送POST请求 

       TestPost.sendPost("http://localhost:8080/test/post", 

           "title="+newString(java.net.URLEncoder.encode(title,"utf-8").getBytes(),"ISO-8859-1")+"); 

    }

//========================服务器端需要转码======

     @POST

     @Path("/post")

     publicvoidt(@FormParam("title") String title)throwsUnsupportedEncodingException{

             System.out.println(java.net.URLDecoder.decode(newString(title.getBytes("ISO-8859-1"),"UTF-8"),"UTF-8"));

     }