從HttpServletRequest中獲取body中的參數幾種方式

從HttpServletRequest中如何獲取body中的參數？

一、

Map<String,Object> params = new HashMap<String, Object>();
        BufferedReader br;
        try {
            br = request.getReader();
            String str, wholeParams = "";
            while((str = br.readLine()) != null){
                wholeParams += str;
            }
            if(StringUtils.isNotBlank(wholeParams)){
                params = JSON.parseObject(wholeParams,Map.class);
            }
        } catch (IOException e) {
            logger.error("",e);
        }
二、servlet中獲取

import com.alibaba.dubbo.common.utils.IOUtils;
public class BusinessServlet extends HttpServlet{

 public static final Logger log = Logger.getLogger(BusinessServlet.class);

 private static final long serialVersionUID = 1L;

 private static BusinessService service;

 static{

 service = (BusinessService) WebContext.getBean("businessService");

 }

 @Override

 protected void doGet(HttpServletRequest req, HttpServletResponse resp)

  throws ServletException, IOException {

 doPost(req, resp);

 }

 @Override

 protected void doPost(HttpServletRequest req, HttpServletResponse res)

  throws ServletException, IOException {

 BufferedReader reader = new BufferedReader(new InputStreamReader(req.getInputStream()));

 String body = IOUtils.read(reader);

 String name = req.getParameter("name");

 if(StringUtils.isNotBlank(body)){
  log.info("business receive somthing with body :"+body);
 }
 res.setCharacterEncoding("UTF-8");
 res.setContentType("application/json");
 res.setStatus(HttpServletResponse.SC_OK);
 res.getWriter().println(service.getName(name));
 }
}

三、

public class HttpServletRequestReader { // 字符串讀取 // 方法一 public static String ReadAsChars(HttpServletRequest request) { BufferedReader br = null; StringBuilder sb = new StringBuilder(""); try { br = request.getReader(); String str; while ((str = br.readLine()) != null) { sb.append(str); } br.close(); } catch (IOException e) { e.printStackTrace(); } finally { if (null != br) { try { br.close(); } catch (IOException e) { e.printStackTrace(); } } } return sb.toString(); } // 方法二 public static void ReadAsChars2(HttpServletRequest request) { InputStream is = null; try { is = request.getInputStream(); StringBuilder sb = new StringBuilder(); byte[] b = new byte[4096]; for (int n; (n = is.read(b)) != -1;) { sb.append(new String(b, 0, n)); } } catch (IOException e) { e.printStackTrace(); } finally { if (null != is) { try { is.close(); } catch (IOException e) { e.printStackTrace(); } } } } // 二進制讀取 public static byte[] readAsBytes(HttpServletRequest request) { int len = request.getContentLength(); byte[] buffer = new byte[len]; ServletInputStream in = null; try { in = request.getInputStream(); in.read(buffer, 0, len); in.close(); } catch (IOException e) { e.printStackTrace(); } finally { if (null != in) { try { in.close(); } catch (IOException e) { e.printStackTrace(); } } } return buffer; } }

PS：
HttpServletRequest 請求中的 body 內容僅能調用 request.getInputStream()， request.getReader()和request.getParameter("key") 方法讀取一次，重復讀取會報 java.io.IOException: Stream closed 異常。