HttpServletRequest 接收并解析获取JSON数据

最近在弄Security权限时遇到attemptAuthentication接口接收登录参数的时候只能用request,但是现在很多项目都是已经使用前后端分离的开发模式了

像以往我们在Controller的时候处理json数据转换只需要标注@RequestBody注解即可.

有问题就要解决,打开debug找了一下request的字段内容,并没有发现我所需要的Json数据,一时比较辣手,最后不得不面向Google编程了.

以下是工具类

public class GetRequestJsonUtils {
    public static JSONObject getRequestJsonObject(HttpServletRequest request) throws IOException {
        String json = getRequestJsonString(request);
        return JSONObject.parseObject(json);
    }
    /***
     * 获取 request 中 json 字符串的内容
     *
     * @param request
     * @return : <code>byte[]</code>
     * @throws IOException
     */
    public static String getRequestJsonString(HttpServletRequest request)
            throws IOException {
        String submitMehtod = request.getMethod();
        // GET
        if (submitMehtod.equals("GET")) {
            return new String(request.getQueryString().getBytes("iso-8859-1"),"utf-8").replaceAll("%22", "\"");
            // POST
        } else {
            return getRequestPostStr(request);
        }
    }

    /**
     * 描述:获取 post 请求的 byte[] 数组
     * <pre>
     * 举例：
     * </pre>
     * @param request
     * @return
     * @throws IOException
     */
    public static byte[] getRequestPostBytes(HttpServletRequest request)
            throws IOException {
        int contentLength = request.getContentLength();
        if(contentLength<0){
            return null;
        }
        byte buffer[] = new byte[contentLength];
        for (int i = 0; i < contentLength;) {

            int readlen = request.getInputStream().read(buffer, i,
                    contentLength - i);
            if (readlen == -1) {
                break;
            }
            i += readlen;
        }
        return buffer;
    }

    /**
     * 描述:获取 post 请求内容
     * <pre>
     * 举例：
     * </pre>
     * @param request
     * @return
     * @throws IOException
     */
    public static String getRequestPostStr(HttpServletRequest request)
            throws IOException {
        byte buffer[] = getRequestPostBytes(request);
        String charEncoding = request.getCharacterEncoding();
        if (charEncoding == null) {
            charEncoding = "UTF-8";
        }
        return new String(buffer, charEncoding);
    }


}

最后我们只需要把request传入GetRequestJsonUtils返回一个JSONObject 对象.

JSONObject json = GetRequestJsonUtils.getRequestJsonObject(request);
String username = json.getString(usernameParameter);
String password = json.getString(passwordParameter);

原文地址:https://blog.csdn.net/tengdazhang770960436/article/details/50149061