我已经看到一些非常难看的代码来自人们编写自己的方法将HttpResponse转换为字符串以便稍后使用,看起来像这样:
httppost.setEntity(new UrlEncodedFormEntity(valuePairs));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
InputStream is = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(is,"UTF8"),8);
StringBuilder sb = new StringBuilder();
sb.append(reader.readLine() + "\n");
String line="0";
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
String result = sb.toString();
这不仅是一个混乱,但它真的很难看,而且我常常无法分辨代码发生了什么,因为这个混乱在它之前.有没有更好的方法来做到这一点？
有没有办法在 a 中调用 URL 操作<h:commandButton>，或者就此而言是 a <h:form>？我试图从我自己的网站绕过我的电子邮件的登录页面，所以我使用 JSF bean 将我的登录信息保存在<h:inputSecret>标签中，以便我可以简单地单击“转到电子邮件”，因为我已登录到我自己的网站，我可以直接进入我的收件箱，而无需再次登录
我无法声明我可以在特定类的所有函数中使用的DB字段类型的枚举.使用以下代码,我得到"无法将USERNAME解析为变量类型":
public class SQL_access {
public enum DBfields { BLANK, USERNAME, ID, PASSWORD, FIRSTNAME, LASTNAME };
public boolean loginValidate( String username, String password ){
String DBuser, DBpass;
PreparedStatement table = connectToTable( "firstsql", "users");
ResultSet row = table.executeQuery();;
while(row.next()){
DBuser = row.getString(USERNAME);
if(DBuser.equals(username)){
DBpass = row.getString(PASSWORD);
break;
}
}
}
};
我有以下页面使用JSF将.pdf文件上传到服务器上指定的文件夹.但是,commandButton操作似乎根本没有触发,因为我的println()没有显示,也没有消息更新.如果有人能解释这个问题,我们将不胜感激.
XHTML页面:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:t="http://myfaces.apache.org/tomahawk"
xmlns:f="http://java.sun.com/jsf/core" xml:lang="en" lang="en">
<head>
<meta http-equiv="keywords" content="enter,your,keywords,here" />
<meta http-equiv="description"
content="A short description of this page." />
<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
<link rel="stylesheet" type="text/css" href="Styles/style.css" />
<script type="text/javascript" src="http://ajax.microsoft.com/ajax/jquery/jquery-1.7.2.min.js"></script>
</head>
<body>
<h:form enctype="multipart/form-data">
<h:outputText value="First Name: " />
<h:inputText id="fname" size="40" value="#{userBean.firstName}" required="true"/> <br/>
<h:outputText value="Last Name: " />
<h:inputText id="lname" size="40" value="#{userBean.lastName}" required="true"/> <br/>
<h:outputText value="Position Sought: "/>
<h:inputText id="position" …我正在尝试创建一个访问数据库的简单登录页面,以便在验证用户名和密码时,在类中设置id,firstName,lastName以进行访问.我收到此错误:
javax.servlet.ServletException: Unable to create managed bean UserBean. The following problems were found:
- Property firstName for managed bean UserBean does not exist. Check that appropriate getter and/or setter methods exist.
- Property id for managed bean UserBean does not exist. Check that appropriate getter and/or setter methods exist.
- Property lastName for managed bean UserBean does not exist. Check that appropriate getter and/or setter methods exist.
javax.faces.webapp.FacesServlet.service(FacesServlet.java:321)
我有id,firstName,lastName但没有setter的getter,因为它们是在验证后设置的.
这是类UserBean
public class UserBean {
private static String password, username, id, …