1 $.ajax({ 2    url: getUrl(), 3    type: "POST", 4    datatype:"json", 5    headers: {'Content-Type': 'application/json'},  // 或者使用 contentType: "application/json" 6    data: getJson(), // 必须是json串 7    success: function (data) { 8       writeXml(JSON.stringify(data)); 9    },10    error: function(XMLHttpRequest, textStatus, errorThrown) {11       // alert("textStatus = " + textStatus + " | status = " + XMLHttpRequest.status);12 13       if(XMLHttpRequest.readyState == 4) {14          writeXml(XMLHttpRequest.responseText);15       }16    }17 });

1 private String getReqContent(HttpServletRequest req, HttpServletResponse resp)  2       throws Exception  3    { 4       String appMsg = null; 5       BufferedReader br = null; 6  7       try { 8          br = new BufferedReader(new InputStreamReader(req.getInputStream(), "UTF-8")); 9          String line = null;10          StringBuffer sb = new StringBuffer();11 12          while((line = br.readLine()) != null) {13             sb.append(line);14          }15 16          appMsg = sb.toString();17       }18       catch(Exception ex) {19          log.log(Level.WARNING, "YHWebApi" + ex.getMessage(), ex);20          throw new ApiException("getReqContent error " + ex.getMessage(), 21             POST_GET_REQ_INFO_FROM_STREAM);22       }23       finally {24          if(br != null) {25             try {26                br.close();27             }28             catch(IOException e) {29             }30          }31       }32       33       return appMsg;34    }