java 获取request中的请求参数代码详解

Z时代
2024-01-10
分类：综合

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 ();
 }