java直接在response中添加写入返回信息
/**
* 网络请求直接在response中返回信息
* @param map 返回response中的信息
* @param request
* @param response
* @param code
* @param msg
* @throws JsonProcessingException
* @throws IOException
*/
public static void outPrint(Map<String,Object> map, HttpServletRequest request, HttpServletResponse response, Integer code, String msg) throws JsonProcessingException, IOException {
HttpServletResponse httpresponse = (HttpServletResponse) response;
Map<String, Object> m=new HashMap<>();
if(!map.isEmpty()){
for(Map.Entry<String,Object> me:map.entrySet()){
String key=me.getKey();
Object value=me.getValue();
m.put(key,value);
}
}
if(code == null) {
m.put("code", 300);
}else {
m.put("code", code);
}
m.put("msg", msg);
httpresponse.reset();
httpresponse.setHeader("Access-Control-Allow-Credentials", "true");
httpresponse.setHeader("Access-Control-Allow-Origin", "*");
httpresponse.setHeader("Access-Control-Allow-Headers", request.getHeader("Access-Control-Request-Headers"));
httpresponse.setContentType("application/json;charset=UTF-8");
PrintWriter writer = null;
try {
writer = httpresponse.getWriter();
writer.write(JSONObject.toJSONString(m));
} catch (IOException e) {
e.printStackTrace();
} finally {
if (writer != null)
writer.close();
}
}