4

我正在开发一个 JSF 表单原型，用于使用 AJAX 数据验证将数据插入数据库表这是 JSF 页面：

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"    
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:f="http://java.sun.com/jsf/core"
      xmlns:ui="http://java.sun.com/jsf/facelets">
    <h:head>
        <ui:insert name="header">           
            <ui:include src="header.xhtml"/>         
        </ui:insert>
    </h:head>
    <h:body>

        <h1><img src="resources/css/images/icon.png" alt="NVIDIA.com" /> History Center</h1>
        <!-- layer for black background of the buttons -->
        <div id="toolbar" style="margin: 0 auto; width:1180px; height:30px; position:relative;  background-color:black">
            <!-- Include page Navigation -->
            <ui:insert name="Navigation">           
                <ui:include src="Navigation.xhtml"/>         
            </ui:insert>

        </div>  

        <div id="logodiv" style="position:relative; top:35px; left:0px;"> 
            <h:graphicImage alt="Demo Insert Form"  style="position:relative; top:-20px; left:9px;"  value="resources/images/logo_databasez.png" />
        </div>
        <div id="main" style="margin: 0 auto; width:1190px; height:700px; position:absolute;  background-color:transparent; top:105px">

            <div id="mainpage" style="margin: 0 auto; width:1190px; height:500px; position:absolute;  background-color:transparent; top:80px">

                <div id="settingsHashMap" style="width:350px; height:400px; position:absolute;  background-color:r; top:20px; left:1px">
                    <h:form>
                        <div id="settingsdiv" style="width:750px; height:400px; position:absolute;  background-color:r; top:20px; left:1px">

                            <h:panelGrid columns="2">
                                <h:panelGroup>Session ID</h:panelGroup>
                                <h:panelGroup>
                                    <h:inputText id="sessionid" value="#{DatabaseController.formMap['sessionid']}" >
                                        <f:validateLength minimum="0" maximum="15"/>
                                        <f:ajax render="sessionidvalidate" event="blur"/>                                          
                                    </h:inputText>
                                    <h:outputText id="sessionidvalidate" rendered="#{DatabaseController.validateSessionid}" value="session is already registered" />
                                </h:panelGroup>

                                <h:panelGroup>User ID</h:panelGroup>
                                <h:panelGroup>
                                    <h:inputText id="userid" value="#{DatabaseController.formMap['userid']}" >
                                        <f:validateLength minimum="0" maximum="15"/>
                                    </h:inputText>
                                </h:panelGroup>

                                <h:panelGroup>Login Time</h:panelGroup>
                                <h:panelGroup>
                                    <h:inputText id="logintime" value="#{DatabaseController.formMap['logintime']}" >
                                        <f:validateLength minimum="0" maximum="35"/>
                                    </h:inputText>
                                </h:panelGroup>

                                <h:panelGroup>Last Refresh Time</h:panelGroup>
                                <h:panelGroup>
                                    <h:inputText id="lastrefreshtime" value="#{DatabaseController.formMap['lastrefreshtime']}" >
                                        <f:validateLength minimum="0" maximum="35"/>
                                    </h:inputText>
                                </h:panelGroup>

                                <h:panelGroup>User IP</h:panelGroup>
                                <h:panelGroup>
                                    <h:inputText id="userip" value="#{DatabaseController.formMap['userip']}" >
                                        <f:validateLength minimum="0" maximum="15"/>
                                    </h:inputText>
                                </h:panelGroup>

                            </h:panelGrid>          

                        </div>   

                        <div id="settingstwodiv" style="width:150px; height:60px; position:absolute;  background-color:transparent; top:380px; left:800px">

                            <h:commandButton value="Create User" action="#{DatabaseController.saveData}"/>

                        </div> 
                    </h:form> 

                </div>   

            </div>  
        </div>

    </h:body>
</html>

这是托管 bean：

import java.io.Serializable;
import javax.enterprise.context.SessionScoped;
// or import javax.faces.bean.SessionScoped;
import javax.inject.Named;
/* include SQL Packages */
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Timestamp;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.HashMap;
import javax.annotation.PostConstruct;
import javax.sql.DataSource;
import javax.annotation.Resource;
import javax.faces.context.FacesContext;
import javax.inject.Inject;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
// or import javax.faces.bean.ManagedBean;   

import org.glassfish.osgicdi.OSGiService;

// Demo Insert Form
@Named("DatabaseController")
@SessionScoped
public class Database implements Serializable {

    private HashMap<String, String> formMap = new HashMap<>();

    public Database() {
    }
    /* Call the Oracle JDBC Connection driver */
    @Resource(name = "jdbc/Oracle")
    private DataSource ds;

    public HashMap<String, String> getformMap() {
        return formMap;
    }

    /*

    CREATE TABLE ACTIVESESSIONS(
    SESSIONID VARCHAR2(30 ) NOT NULL,
    USERID VARCHAR2(30 ) NOT NULL,
    LOGINTIME TIMESTAMP(6),
    LASTREFRESHTIME TIMESTAMP(6),
    USERIP VARCHAR2(30 )
    )
    /
     */
    @PostConstruct
    public void hashMapGenerate() {
        /* Initialize the hashmap */
        formMap.put("sessionid", null);
        formMap.put("userid", null);
        formMap.put("logintime", null);
        formMap.put("lastrefreshtime", null);
        formMap.put("userip", null);
    }

    public int saveData() throws SQLException, java.text.ParseException {
//        formMap = new HashMap<String, String>();

        String SqlStatement = null;

        if (ds == null) {
            throw new SQLException();
        }

        Connection conn = ds.getConnection();
        if (conn == null) {
            throw new SQLException();
        }

        PreparedStatement ps = null;

        /*

        CREATE TABLE ACTIVESESSIONS(
        SESSIONID VARCHAR2(30 ) NOT NULL,
        USERID VARCHAR2(30 ) NOT NULL,
        LOGINTIME TIMESTAMP(6),
        LASTREFRESHTIME TIMESTAMP(6),
        USERIP VARCHAR2(30 )
        )
        /
         */

        try {
            conn.setAutoCommit(false);
            boolean committed = false;
            try {           /* insert into Oracle the default system(Linux) time */
                SqlStatement = "INSERT INTO ACTIVESESSIONS"
                        + " (SESSIONID, USERID, LOGINTIME, LASTREFRESHTIME, USERIP)"
                        + " VALUES (?, ?, ?, ?, ?)";

                ps = conn.prepareStatement(SqlStatement);

                ps.setString(1, formMap.get("sessionid"));
                ps.setString(2, formMap.get("userid"));
                ps.setTimestamp(3, toTimeStamp(formMap.get("logintime")));
                ps.setTimestamp(4, toTimeStamp(formMap.get("lastrefreshtime")));
                ps.setString(5, formMap.get("userip"));

                ps.executeUpdate();

                conn.commit();
                committed = true;
            }
            finally 
            {
                if (!committed) {
                    conn.rollback();
                }
            }
        } finally {
            /* Release the resources */
            ps.close();
            conn.close();
        }

        return 0;

    }
    private Timestamp toTimeStamp(String s) throws java.text.ParseException
    {
        Timestamp ts = null;
        java.util.Date date = null;
        if (s == null || s.trim().isEmpty()) return ts;

        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss.S");
        date = (java.util.Date) sdf.parse(s);
        ts = new Timestamp(date.getTime());

        return ts;

    }

    /* Validators section */
    public boolean getvalidateSessionid(){

        //do SQL query

        return true;
    }

}

我在实施表单验证时遇到了困难。我想通过使用输入的字符串并将其检入数据库，这个值是否已经进入数据库表。这里我调用 Java 方法来检查值：

                            <h:panelGroup>
                                <h:inputText id="sessionid" value="#{DatabaseController.formMap['sessionid']}" >
                                    <f:validateLength minimum="0" maximum="15"/>
                                    <f:ajax render="sessionidvalidate" event="blur"/>                                          
                                </h:inputText>
                                <h:outputText id="sessionidvalidate" rendered="#{DatabaseController.validateSessionid}" value="session is already registered" />
                            </h:panelGroup>

如何将插入的值发送到 Java 方法？

最良好的祝愿

4

2 回答 2

10

您需要创建一个Validator.

开球示例：

@FacesValidator("sessionIdValidator")
public class SessionIdValidator implements Validator {

    @Override
    public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
        // ...

        if (yourDataService.existSessionId(value)) {
            throw new ValidatorException(new FacesMessage(FacesMessage.SEVERITY_ERROR,
                "Session ID is already in use, please choose another.", null));
        }
    }

}

按如下方式使用它：

<h:inputText id="sessionid" value="#{DatabaseController.formMap['sessionid']}">
    <f:validateLength minimum="0" maximum="15" />
    <f:validator validatorId="sessionIdValidator" />
    <f:ajax event="blur" render="sessionidMessage" />                                          
</h:inputText>
<h:message id="sessionidMessage" for="sessionid" />

请注意，您应该使用 a<h:message>来显示验证消息。你没有任何人在你的视野中。对所有其他字段应用相同的：

<h:inputText id="userid" value="#{DatabaseController.formMap['userid']}">
    <f:validateLength minimum="0" maximum="15" />
    <f:ajax event="blur" render="useridMessage" />                                          
</h:inputText>
<h:message id="useridMessage" for="userid" />

如果您想在验证器中使用@Resourceor @EJB，则将注释@Inject替换为or （因为您似乎出于某种原因使用 CDI）：@FacesValidator@ManagedBean@Named

@Named
public class SessionIdValidator implements Validator {

    @Resource
    private DataSource dataSource;

    @Inject
    private YourDataService yourDataService;

    // ...
}

并按如下方式使用它

    <f:validator binding="#{sessionIdValidator}" />
于 2012-05-04T19:56:17.590 回答
1

只需在您的标签中添加监听器h:inputText：

<h:inputText id="sessionid" value="#{DatabaseController.formMap['sessionid']}" 
         valueChangeListener="#{DatabaseController.validateSessionid}">

因此，您可以在服务器端检查输入的值。当用户跳出输入字段时，JSF 对服务器进行 ajax 调用，并通过生命周期的执行部分运行名称输入组件。这意味着 JSF 将valueChangeListener在生命周期的验证过程阶段调用在属性中指定的名称输入的值更改侦听器。

我建议实现这个方法：

public void validateSessionid(ValueChangeEvent e) {
    UIInput nameInput = e.getComponent()
    String sessionid = nameInput.getValue()

    //do SQL query
}

在 ajax 调用返回后，JSF 呈现h:outputText id="sessionidvalidate".

于 2012-05-04T19:47:07.813 回答