JSF converter helloworld

问题：

演示下怎么定制Converter , FacesConverter

解决：

User.java + Test1.xhmtl + Test1Controller.java + UserConverter.java;

class User:

/*
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 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package me.yek.testjsinsertele;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Objects;
import java.util.logging.Logger;

/**
 *
 * @author sihai
 */
public class User implements java.io.Serializable {

    private static final Logger LOG = Logger.getLogger(User.class.getName());

    String name;
    Integer id;
    Date birthday;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    @Override
    public String toString() {
        return "User{" + "name=" + name + ", id=" + id + ", birthday=" + birthday + '}';
    }

    @Override
    public int hashCode() {
        int hash = 3;
        hash = 59 * hash + Objects.hashCode(this.id);
        return hash;
    }

    @Override
    public boolean equals(Object obj) {
        LOG.info("User.equals enter...");
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final User other = (User) obj;
        if (!Objects.equals(this.id, other.id)) {
            return false;
        }
        return true;
    }

    
    
    public static List<User> list(){
        List<User> ret=new ArrayList<>();
        for (int i = 0; i < 5; ++i) {
            User u = new User();
            u.setId(i);
            u.setName("user " + i);
            ret.add(u);
        }
        return ret;
    }
}

* To change this license header, choose License Headers in Project Properties.

* To change this template file, choose Tools | Templates

* and open the template in the editor.

package me.yek.testjsinsertele;

import java.util.ArrayList;

import java.util.Date;

import java.util.List;

import java.util.Objects;

import java.util.logging.Logger;

/**

* @author sihai

public class User implements java.io.Serializable {

private static final Logger LOG = Logger.getLogger(User.class.getName());

String name;

Integer id;

Date birthday;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public Integer getId() {

return id;

}

public void setId(Integer id) {

this.id = id;

}

public Date getBirthday() {

return birthday;

}

public void setBirthday(Date birthday) {

this.birthday = birthday;

}

@Override

public String toString() {

return "User{" + "name=" + name + ", id=" + id + ", birthday=" + birthday + '}';

}

@Override

public int hashCode() {

int hash = 3;

hash = 59 * hash + Objects.hashCode(this.id);

return hash;

}

@Override

public boolean equals(Object obj) {

LOG.info("User.equals enter...");

if (this == obj) {

return true;

}

if (obj == null) {

return false;

}

if (getClass() != obj.getClass()) {

return false;

}

final User other = (User) obj;

if (!Objects.equals(this.id, other.id)) {

return false;

}

return true;

}

public static List<User> list(){

List<User> ret=new ArrayList<>();

for (int i = 0; i < 5; ++i) {

User u = new User();

u.setId(i);

u.setName("user " + i);

ret.add(u);

}

return ret;

}

Test1.xhtml

<?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:h="http://xmlns.jcp.org/jsf/html"
      xmlns:f="http://xmlns.jcp.org/jsf/core">
    <h:head>
        <title>Facelet Title</title>
    </h:head>
    <h:body>
        <h:form>
            <h:selectOneMenu value="#{test1.selectedUser}">
                <f:selectItems value="#{test1.userItemList}" />
            </h:selectOneMenu>
            <h:commandButton action="#{test1.save()}" value="save" />
        </h:form>
    </h:body>
</html>

<?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:h="http://xmlns.jcp.org/jsf/html"

xmlns:f="http://xmlns.jcp.org/jsf/core">

<h:head>

<title>Facelet Title</title>

</h:head>

<h:body>

<h:form>

<h:selectOneMenu value="#{test1.selectedUser}">

<f:selectItems value="#{test1.userItemList}" />

</h:selectOneMenu>

<h:commandButton action="#{test1.save()}" value="save" />

</h:form>

</h:body>

</html>

Test1Controller.java

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package me.yek.testjsinsertele;

import java.util.ArrayList;
import java.util.List;
import java.util.logging.Logger;
import javax.faces.convert.Converter;
import javax.faces.model.SelectItem;
import javax.inject.Named;
import javax.faces.view.ViewScoped;

/**
 *
 * @author sihai
 */
@Named(value = "test1")
@ViewScoped
public class Test1Controller implements java.io.Serializable {

    private static final Logger LOG = Logger.getLogger(Test1Controller.class.getName());

    /**
     * Creates a new instance of Test1Controller
     */
    public Test1Controller() {
    }

    public Converter getUserConvert() {
        return new UserConverter();
    }

    private User selectedUser;

    public User getSelectedUser() {
        return selectedUser;
    }

    public void setSelectedUser(User selectedUser) {
        LOG.info("setSelectedUser enter " + selectedUser);
        this.selectedUser = selectedUser;
    }

    
    public List<SelectItem> getUserItemList() {
        List<User> userList=User.list();
        List<SelectItem> ret = new ArrayList<>();
        for (User u : userList) {
            ret.add(new SelectItem(u, u.getName()));
        }
        return ret;
    }

    public void save() {
        LOG.info("save() enter..." + selectedUser);
    }
}

* To change this license header, choose License Headers in Project Properties.

* To change this template file, choose Tools | Templates

* and open the template in the editor.

package me.yek.testjsinsertele;

import java.util.ArrayList;

import java.util.List;

import java.util.logging.Logger;

import javax.faces.convert.Converter;

import javax.faces.model.SelectItem;

import javax.inject.Named;

import javax.faces.view.ViewScoped;

/**

* @author sihai

@Named(value = "test1")

@ViewScoped

public class Test1Controller implements java.io.Serializable {

private static final Logger LOG = Logger.getLogger(Test1Controller.class.getName());

/**

* Creates a new instance of Test1Controller

public Test1Controller() {

}

public Converter getUserConvert() {

return new UserConverter();

}

private User selectedUser;

public User getSelectedUser() {

return selectedUser;

}

public void setSelectedUser(User selectedUser) {

LOG.info("setSelectedUser enter " + selectedUser);

this.selectedUser = selectedUser;

}

public List<SelectItem> getUserItemList() {

List<User> userList=User.list();

List<SelectItem> ret = new ArrayList<>();

for (User u : userList) {

ret.add(new SelectItem(u, u.getName()));

}

return ret;

}

public void save() {

LOG.info("save() enter..." + selectedUser);

}

class UserConverter

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package me.yek.testjsinsertele;

import java.util.List;
import java.util.Objects;
import java.util.logging.Logger;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.FacesConverter;

/**
 *
 * @author sihai
 */
@FacesConverter(forClass=User.class)
public class UserConverter implements Converter {

    private static final Logger LOG = Logger.getLogger(UserConverter.class.getName());

    @Override
    public Object getAsObject(FacesContext context, UIComponent component, String value) {
        LOG.info("getAsObject enter ..." + value);        
        List<User> us=User.list();
        User ret=null;
        int userId=Integer.parseInt(value);
        for(User u : us){
            if( Objects.equals(userId, u.getId()) ){
                ret=u;
                break;
            }
        }
        return ret;
    }

    @Override
    public String getAsString(FacesContext context, UIComponent component, Object value) {
        LOG.info("getAsString enter ..." + value);
        User u=(User)value;
        return u.getId().toString();
    }

}

* To change this license header, choose License Headers in Project Properties.

* To change this template file, choose Tools | Templates

* and open the template in the editor.

package me.yek.testjsinsertele;

import java.util.List;

import java.util.Objects;

import java.util.logging.Logger;

import javax.faces.component.UIComponent;

import javax.faces.context.FacesContext;

import javax.faces.convert.Converter;

import javax.faces.convert.FacesConverter;

/**

* @author sihai

@FacesConverter(forClass=User.class)

public class UserConverter implements Converter {

private static final Logger LOG = Logger.getLogger(UserConverter.class.getName());

@Override

public Object getAsObject(FacesContext context, UIComponent component, String value) {

LOG.info("getAsObject enter ..." + value);

List<User> us=User.list();

User ret=null;

int userId=Integer.parseInt(value);

for(User u : us){

if( Objects.equals(userId, u.getId()) ){

ret=u;

break;

}

return ret;

}

@Override

public String getAsString(FacesContext context, UIComponent component, Object value) {

LOG.info("getAsString enter ..." + value);

User u=(User)value;

return u.getId().toString();

}

IT问题

程序员的疑难杂症录

JSF converter helloworld

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