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从request对象中读取信息，并转换成字符串：

public static String readReqStr(HttpServletRequest request){        BufferedReader reader = null;        StringBuilder sb = new StringBuilder();        try{            reader = new BufferedReader(new InputStreamReader(request.getInputStream(), "utf-8"));            String line = null;            while ((line = reader.readLine()) != null){                sb.append(line);            }        } catch (IOException e){            e.printStackTrace();        } finally {            try{                if (null != reader){ reader.close();}            } catch (IOException e){            	e.printStackTrace();            }        }        return sb.toString();    }

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