JSF2中带有参数的自定义转换器
我正在尝试实现一个定制的截断转换器,它在给定的索引处截断一个字符串,并添加一个延续符号。只有当我硬编码参数时,转换器才能正常工作,因为它们没有被传递到后端。我做错了什么 这些参数是转换器类的属性:JSF2中带有参数的自定义转换器,jsf,jsf-2,converter,Jsf,Jsf 2,Converter,我正在尝试实现一个定制的截断转换器,它在给定的索引处截断一个字符串,并添加一个延续符号。只有当我硬编码参数时,转换器才能正常工作,因为它们没有被传递到后端。我做错了什么 这些参数是转换器类的属性: @FacesConverter(value = TruncateConverter.CONVERTER_ID) public class TruncateConverter implements Converter, StateHolder { public static final Stri
@FacesConverter(value = TruncateConverter.CONVERTER_ID)
public class TruncateConverter implements Converter, StateHolder
{
public static final String CONVERTER_ID = "bla.blablabla.Truncate";
private int truncateIndex;
private String contSymbol;
以下是我如何使用转换器(或尝试):
我在谷歌上搜索了很长一段时间,找不到一个带有参数的JSF2转换器示例。。。谢谢你们的帮助,非常感谢 您可以看看JSF2.0源代码。例如DateTimeConverter。。。svn repostory中提供的JSF源代码: 创建这样的转换器并不容易。它还需要创建转换器标签来注册转换器 将一些数据传递给转换器的另一种方法是attibutes。这样你就可以写作了
<h:outputText ...>
<f:converter converterId="bla.blablabla.Truncate" />
<f:attribute name="truncateIndex" value="150"/>
</h:outputText>
然后调用component.getAttributes().get(“truncateIndex”)代码>
在转换器代码中。是根据解决方案设置第一个带有参数的自定义转换器的良好指南:可以将转换器和属性组合在一个标记中:
<facelet-taglib version="2.2"
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-facelettaglibrary_2_2.xsd">
<namespace>http://mycompany.com/some-identifier</namespace>
<tag>
<tag-name>truncate</tag-name>
<converter>
<converter-id>bla.blablabla.Truncate</converter-id>
</converter>
<attribute>
<name>truncateIndex</name>
</attribute>
</tag>
</facelet-taglib>
我就是这样做的(在一个单独的jar文件中,使用maven的默认目录):
1) 创建转换器的类(在src/main/java内部)
2) 创建一个.taglib.xml类(在src/main/resources/META-INF内)
3) 创建一个faces-config.xml(在src/main/resources/META-INF中)
例如:
步骤1)
步骤2)
http://ocabit.com.br/facelets
convertBigDecimal
com.com.jsf.converter.BigDecimalConverter
步骤3)
com.com.jsf.converter.BigDecimalConverter
com.com.jsf.converter.BigDecimalConverter
零零
布尔值
Ao Retronar投资“空”,Retrona“0.0”
zeroToNull
布尔值
Ao Retronar投资'0.0',Retrona'null'
唯一的
布尔值
积极的态度
昂利涅格
布尔值
萨门特·雷托纳·努梅罗斯·内格罗斯(Somente Retrona números Negatives)
小数
int
德卡斯德西迈斯量表
瞧。你能注意到f:属性不应该在转换器块中,它应该在输出文本中结束。该属性绑定到组件id,而不是转换器本身。
<facelet-taglib version="2.2"
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-facelettaglibrary_2_2.xsd">
<namespace>http://mycompany.com/some-identifier</namespace>
<tag>
<tag-name>truncate</tag-name>
<converter>
<converter-id>bla.blablabla.Truncate</converter-id>
</converter>
<attribute>
<name>truncateIndex</name>
</attribute>
</tag>
</facelet-taglib>
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:my="http://mycompany.com/some-identifier">
<my:truncate truncateIndex="150" />
</ui:composition>
@FacesConverter("bla.blablabla.Truncate")
public class Truncate implements Converter {
private String truncateIndex;
// getters + setters
...
}
package com.ocabit.jsf.converter;
import java.io.Serializable;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.text.NumberFormat;
import javax.faces.application.FacesMessage;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.ConverterException;
import javax.faces.convert.FacesConverter;
import org.springframework.stereotype.Service;
import com.ocabit.utils.currency.CurrencyUtils;
/**
* Converter para valores BigDecimal.
*
* @author Carlos Eduardo Pauluk
*
*/
@FacesConverter("bigDecimalConverter")
@Service("bigDecimalConverter")
public class BigDecimalConverter implements Converter, Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
public static final String CONVERTER_ID = "com.ocabit.jsf.converter.BigDecimalConverter";
/**
* Em caso de null, força a saída para 0.0;
*/
private boolean nullToZero = false;
/**
* Em caso de zero, força a saída para null;.
*/
private boolean zeroToNull = false;
/**
* Só retorna números positivos.
*/
private boolean onlyAbs = false;
/**
* Só retorna números negativos.
*/
private boolean onlyNeg = false;
/**
* Quantidade de casas decimais.
*/
private int decimals = 2;
@Override
public Object getAsObject(final FacesContext context, final UIComponent component, final String value) {
try {
BigDecimal bd = new BigDecimal(value);
bd = bd.setScale(getDecimals(), RoundingMode.HALF_DOWN);
if (bd.equals(BigDecimal.ZERO) && isZeroToNull()) {
return null;
}
if (isOnlyAbs()) {
bd = bd.abs();
}
if (isOnlyNeg()) {
bd = bd.abs();
bd = bd.negate();
}
return bd;
} catch (final Exception e) {
BigDecimal bd = null;
if (isNullToZero()) {
bd = CurrencyUtils.getBigDecimalCurrency("0.0");
bd = bd.setScale(getDecimals(), RoundingMode.HALF_DOWN);
}
return bd;
}
}
@Override
public String getAsString(final FacesContext context, final UIComponent component, final Object value) {
if (!(value instanceof BigDecimal)) {
throw new ConverterException(new FacesMessage(FacesMessage.SEVERITY_ERROR, "Erro ao converter o valor decimal.", ""));
}
final NumberFormat nf = NumberFormat.getInstance();
// sempre terá 2 casas decimais
nf.setMinimumFractionDigits(2);
nf.setMaximumFractionDigits(2);
return nf.format(((BigDecimal) value).doubleValue());
}
public boolean isNullToZero() {
return nullToZero;
}
public void setNullToZero(boolean nullToZero) {
this.nullToZero = nullToZero;
}
public boolean isZeroToNull() {
return zeroToNull;
}
public void setZeroToNull(boolean zeroToNull) {
this.zeroToNull = zeroToNull;
}
public boolean isOnlyAbs() {
return onlyAbs;
}
public void setOnlyAbs(boolean onlyAbs) {
this.onlyAbs = onlyAbs;
}
public boolean isOnlyNeg() {
return onlyNeg;
}
public void setOnlyNeg(boolean onlyNeg) {
this.onlyNeg = onlyNeg;
}
public int getDecimals() {
return decimals;
}
public void setDecimals(int decimals) {
this.decimals = decimals;
}
}
<!DOCTYPE facelet-taglib PUBLIC
"-//Sun Microsystems, Inc.//DTD Facelet Taglib 1.0//EN"
"facelet-taglib_1_0.dtd">
<facelet-taglib version="2.2"
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-facelettaglibrary_2_2.xsd">
<namespace>http://ocabit.com.br/facelets</namespace>
<tag>
<tag-name>convertBigDecimal</tag-name>
<converter>
<converter-id>com.ocabit.jsf.converter.BigDecimalConverter</converter-id>
</converter>
</tag>
</facelet-taglib>
<?xml version="1.0" encoding="UTF-8"?>
<faces-config xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
http://xmlns.jcp.org/xml/ns/javaee/web-facesconfig_2_2.xsd"
version="2.2">
<converter>
<description></description>
<converter-id>com.ocabit.jsf.converter.BigDecimalConverter</converter-id>
<converter-class>com.ocabit.jsf.converter.BigDecimalConverter</converter-class>
<property>
<property-name>nullToZero</property-name>
<property-class>boolean</property-class>
<description>Ao invés de retornar 'null', retorna '0.0'</description>
</property>
<property>
<property-name>zeroToNull</property-name>
<property-class>boolean</property-class>
<description>Ao invés de retornar '0.0', retorna 'null'</description>
</property>
<property>
<property-name>onlyAbs</property-name>
<property-class>boolean</property-class>
<description>Somente retorna números positivos</description>
</property>
<property>
<property-name>onlyNeg</property-name>
<property-class>boolean</property-class>
<description>Somente retorna números negativos</description>
</property>
<property>
<property-name>decimals</property-name>
<property-class>int</property-class>
<description>Quantidade de casas decimais</description>
</property>
</converter>
</faces-config>