1、get 和 post请求方式
（1）request.getParameterNames(); 获取所有参数key后。遍历request.getParameter(key)获取value
（2）request.getParameterMap() 。直接包含参数key和value值，简单方便
Map<String, String[]>maps = request.getParameterMap();
for (Map.Entry<String, String[]> entry : maps.entrySet()) {
String cs = entry.getKey() + ":"+Arrays.toString(entry.getValue())+";";
}
2、获取请求类型为request payload方式
这里就不介绍文件流的了，主要针对 后端采用@RequestBody方式的请求
这类数据通过以上2种方式是获取不到的，它是存放在流里面，要通过getInputStream()或getReader()方式获取
public String getRequestData(HttpServletRequest httpServletRequest){
HttpServletRequestWrapper httpServletRequestWrapper = new HttpServletRequestWrapper(httpServletRequest);
StringBuilder sb = new StringBuilder();
BufferedReader reader = null;
InputStreamReader inputStreamReader=null;
ServletInputStream servletInputStream =null;
try {
servletInputStream = httpServletRequestWrapper.getInputStream();
inputStreamReader=new InputStreamReader (servletInputStream, Charset.forName("UTF-8"));
reader = new BufferedReader(inputStreamReader);
String line = "";
while ((line = reader.readLine()) != null) {
sb.append(line);
}
} catch (IOException e) {
return "";
}finally {
try {
if(servletInputStream!=null){
servletInputStream.close();
}
if(inputStreamReader!=null){
inputStreamReader.close();
}
if(reader!=null){
reader.close();
}
} catch (IOException e) {
}
}
return sb.toString ();
}
需要注意的是getInputStream()这种获取流的方式 只能用一次，如果多次调用 需要缓存起来，不然流的数据到不了Controller层，报400错误