工具类
public class ServletRequestUtil { private static ObjectMapper om = new ObjectMapper(); public static HashMap<String,Object> getJson(InputStream getInputStream) throws IOException { BufferedReader br = new BufferedReader(new InputStreamReader(getInputStream)); String line = null; StringBuilder sb = new StringBuilder(); while ((line = br.readLine()) != null) { sb.append(line); } //将空格和换行符替换掉避免使用反序列化工具解析对象时失败 String jsonString = sb.toString().replaceAll("\\s","").replaceAll("\n",""); //json转map<String,Object> HashMap<String,Object> mmap = om.readValue(jsonString, HashMap.class); return mmap; } }servlet类
将request的输入数据流传到工具类中返回一个map
public class DeleteService extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //添加学生 /*设置编码*/ req.setCharacterEncoding("UTF-8"); resp.setContentType("text/html;charset=utf-8"); /*输入的学号*/ //获取数据流中的内容，封装在了ServletRequestUtil中 HashMap<String,Object> jsonData= ServletRequestUtil.getJson(req.getInputStream()); int id = (Integer)jsonData.get("id"); try { //删除学生 StudentDao.delete(id); //返回提示信息 resp.getWriter().write("删除成功"); } catch (SQLException e) { e.printStackTrace(); resp.getWriter().write("删除失败"); } } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doGet(req,resp); } }
