Java向服务器发送POST请求

public String sendToServer(String content) {    
    String urlPath = "http://127.0.0.1:8080/sunrise/test.do"; //服务器地址    
    StringBuffer sbf = new StringBuffer();    
    BufferedWriter writer = null; 
    BufferedReader reader = null; 
    HttpURLConnection uc = null; 
    try {    
        URL url = new URL(urlPath);    
        uc = (HttpURLConnection)url.openConnection();           
        uc.setDoOutput(true);    
        writer = new BufferedWriter(  
                new OutputStreamWriter(uc.getOutputStream())); //向服务器传送数据    
        writer.write(content); //传送的数据     
        writer.flush();     
        writer.close();     
        reader = new BufferedReader( 
                new InputStreamReader(uc.getInputStream()));//读取服务器响应信息    
        String line;    
        while ((line = reader.readLine()) != null){    
            sbf.append(line);    
        }    
        reader.close();    
        uc.disconnect();    
    } catch (Exception e) {    
        sbf.append("服务器连接失败！请稍后重新操作");    
    } finally{    
        closeIO(writer,reader); //关闭流    
    }    
    return sbf.toString().trim();    
}   
 
/**
* 关闭流
*/ 
private void closeIO(BufferedWriter writer,BufferedReader reader){ 
    if (writer != null) { 
        try { 
            writer.close(); 
            writer = null; 
        } catch (Exception e) { 
         
        } 
    } 
    if (reader != null) { 
        try { 
            reader.close(); 
            reader = null; 
        } catch (Exception e) { 
         
        } 
    } 
} 
/**
* 服务器端代码
* 不要使用request.getParameter();因为该方法和
* request.getReader();和request.getInputStream();
* 方法冲突。
*/ 
@Override 
protected void doPost(HttpServletRequest request, HttpServletResponse response) 
        throws ServletException, IOException { 
    response.setContentType("text/html");//注意加上 
    BufferedReader reader = null; 
    try { 
        reader = request.getReader();//获得字符流 
        StringBuffer content= new StringBuffer();  
        String line; 
        while ((line = reader.readLine()) != null){ 
            content.append(line+"\r\n"); 
        } 
        System.out.println(content.toString()); 
    } catch (Exception e) { 
         
    }finally{ 
        try { 
            reader.close(); 
            reader = null; 
        } catch (Exception e) { 
     
        } 
    } 
}