Javaweb获取表单数据的多种方式

@WebServlet({ "/FormServlet", "/form" })
public class FormServlet extends HttpServlet {
 private static final long serialVersiOnUID= 1L;

 public FormServlet() {
 super();
 }

 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

 response.setContentType("text/json;charset=utf-8");

 PrintWriter out = response.getWriter();

 Enumeration paramNames = request.getParameterNames();

 while (paramNames.hasMoreElements()) {
 String name = paramNames.nextElement();

 String[] values = request.getParameterValues(name);

 if(values!=null && values.length>0){
 StringBuilder builder = new StringBuilder(); 
 for (int i = 0; i 

 

 用户名

 密码 

 性别 男
 女

 爱好 篮球
 足球
 游戏
 电影

 城市 
  北京
  上海
  深圳
  杭州
  

  
  


 

@WebServlet({ "/FormServlet", "/form" })
public class FormServlet extends HttpServlet {
 private static final long serialVersiOnUID= 1L;

 public FormServlet() {
 super();
 }

 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

 response.setContentType("text/json;charset=utf-8");

 PrintWriter out = response.getWriter();

 User user = new User();
 out.println("获取表单数据之前："+user.toString());

 Map map = request.getParameterMap();

 for (Map.Entry m : map.entrySet()) {

 String name = m.getKey();
 String[] values = m.getValue();
 //属性描述器：表示JavaBean类通过存储器导出一个属性
 PropertyDescriptor pd=null;
 try {
  pd = new PropertyDescriptor(name, User.class);
 } catch (IntrospectionException e) {
 e.printStackTrace();
 }

 if (values!=null&& pd !=null) {

 Method setter = pd.getWriteMethod();
 try {
  if (values.length==1) {
  setter.invoke(user, values[0]);
  }else {
  setter.invoke(user, (Object)values);
  }
 } catch (IllegalAccessException e) {
  e.printStackTrace();
 } catch (IllegalArgumentException e) {
  e.printStackTrace();
 } catch (InvocationTargetException e) {
  e.printStackTrace();
 }
 }
 }
 out.println("获取表单数据之后："+user.toString());
 }

 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 doGet(request, response);
 }
}

public class User {
 private String username;//属性名称需要和表单数据中的name值保持一致
 private String password;
 private String sex;
 private String[] hobby;
 private String city;
 ...
 //set get方法省略
}

@WebServlet({ "/FormServlet", "/form" })
public class FormServlet extends HttpServlet {
 private static final long serialVersiOnUID= 1L;

 public FormServlet() {
 super();
 }

 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

 response.setContentType("text/json;charset=utf-8");

 PrintWriter out = response.getWriter();

 User user = new User();
 out.println("获取表单数据之前："+user.toString());

 try {
 //通过第三方jar包处理
 BeanUtils.populate(user, request.getParameterMap());
 } catch (IllegalAccessException e) {
 e.printStackTrace();
 } catch (InvocationTargetException e) {
 e.printStackTrace();
 }

 out.println("获取表单数据之后："+user.toString());

 }


 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 doGet(request, response);
 }

}