使用BeanUtil来封装javaBean出现的问题

来源：互联网发布：万网域名编辑：程序博客网时间：2024/06/05 19:16

public void register(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

  try {
   User user=new User();
   Enumeration<String> enumer=request.getParameterNames();
   while(enumer.hasMoreElements()){
    String name=enumer.nextElement();
    String[] value=request.getParameterValues(name);
     BeanUtils.setProperty(user, name, value);

   }
   System.out.println(user.getUsername());
   System.out.println(user.getPassword());
   System.out.println(user.getGender());
   System.out.println(user.getEmail());

  } catch (Exception e) {
   e.printStackTrace();
   request.setAttribute("message", "查询有误");
   request.getRequestDispatcher("/WEB-INF/jsp/massage.jsp").forward(request, response);

  }

}

（要导入的包有 commons-beanutils-1.8.0.jar 与 commons-logging.jar）

1.在post请求下会出现：

java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactoryorg.apache.commons.beanutils.ConvertUtilsBean.<init>(ConvertUtilsBean.java:157)org.apache.commons.beanutils.BeanUtilsBean.<init>(BeanUtilsBean.java:117)

org.apache.commons.beanutils.BeanUtilsBean$1.initialValue(BeanUtilsBean.java:68)

org.apache.commons.beanutils.ContextClassLoaderLocal.get(ContextClassLoaderLocal.java:153)

org.apache.commons.beanutils.BeanUtilsBean.getInstance(BeanUtilsBean.java:80)

org.apache.commons.beanutils.BeanUtils.setProperty(BeanUtils.java:456)

cn.itcast.mvc.servlet.BbsServlet.register(BbsServlet.java:74)

cn.itcast.mvc.servlet.BbsServlet.doGet(BbsServlet.java:31)

cn.itcast.mvc.servlet.BbsServlet.doPost(BbsServlet.java:41)

javax.servlet.http.HttpServlet.service(HttpServlet.java:637)

javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

cn.itcast.mvc.filter.EncodingFilter.doFilter(EncodingFilter.java:30)

cn.itcast.mvc.filter.headerFilter.doFilter(headerFilter.java:28)

2.在get请求下会出现：

java.lang.NullPointerExceptioncn.itcast.mvc.filter.RequestProxy$1.invoke(EncodingFilter.java:73)

$Proxy0.getParameter(Unknown Source)cn.itcast.mvc.servlet.BbsServlet.doGet(BbsServlet.java:22)

javax.servlet.http.HttpServlet.service(HttpServlet.java:617)

javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

cn.itcast.mvc.filter.EncodingFilter.doFilter(EncodingFilter.java:30)

cn.itcast.mvc.filter.headerFilter.doFilter(headerFilter.java:28)

这个主要是导错了一个日志包本来是commons-logging.jar 错导了log4j.jar 才出现上述错误