springmvc里面的get请求，参数获取 400 请求报错 

springmvc处理如下接口：

http://localhost:8080/webgis/vehicle/data/vehicledetail?type=1&params=13812345678

@RequestMapping(value="/data/vehicledetail", method=RequestMethod.GET)
	public String vehicledetail(HttpServletRequest request) throws SystemException {
         Map<String, Object> resultMap = new HashMap<String, Object>();
         String qs = request.getQueryString();
	 Map<String,Object> params = super.parseReqParam(request);
         ............
}

public Map<String,Object> parseReqParam(HttpServletRequest request){
		// 取消对请求串的UTF-8编码，防止不同浏览器中发送请求时进行默认编码处理导致的转码失败
		Map<String, Object> map = null;
		try {
			byte[] buffer = new byte[512];
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			InputStream in = request.getInputStream();
			for (int len = 0; (len = in.read(buffer)) > 0;) {
				baos.write(buffer, 0, len);
			}
			String content = new String(baos.toByteArray(), DEFAULT_ENCODING);
			if(StringUtils.isNotBlank(content)){
				ObjectMapper mapper = new ObjectMapper();
				map = mapper.readValue(content, Map.class);
			}
			
			baos.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
		return  map;
	}

public String vehicledetail(@RequestParam("type") Integer type, HttpServletRequest request) throws SystemException {