我正在使用smooks库来快速轻松地解析csv文件，以编程方式将它们映射到POJO。 但是我在处理POJO的Double属性上的空字段时遇到了麻烦。例如，java对象具有：
public class MulticashHeader {
// ...
private Double c06;
private static Double c07;
private Double c08;
private Double c09;
private String c10;
// ...
public Double getC06_SaldoInicial() {
return c06_SaldoInicial;
}
/**
* @param c06_SaldoInicial the c06_SaldoInicial to set
*/
public void setC06_SaldoInicial(Double c06_SaldoInicial) {
if (c06_SaldoInicial != null)
this.c06_SaldoInicial = c06_SaldoInicial;
}
public void setC06_SaldoInicial(String c06_SaldoInicial) {
if (c06_SaldoInicial != null && !"".equals(c06_SaldoInicial.trim()) ) {
this.c06_SaldoInicial = new Double(c06_SaldoInicial.trim());
} else {
this.c06_SaldoInicial = Double.valueOf("0");
}
}
/**
* @return the c07_TotalDebitos
*/
public Double getC07_TotalDebitos() {
return c07_TotalDebitos;
}
/**
* @param c07_TotalDebitos the c07_TotalDebitos to set
*/
public void setC07_TotalDebitos(Double c07_TotalDebitos) {
MulticashEncabezado.c07_TotalDebitos = c07_TotalDebitos;
}
public void setC07_TotalDebitos(String c07_TotalDebitos) {
if (c07_TotalDebitos != null && !"".equals(c07_TotalDebitos.trim()) ) {
MulticashEncabezado.c07_TotalDebitos = new Double(c07_TotalDebitos.trim());
} else {
MulticashEncabezado.c07_TotalDebitos = Double.valueOf("0");
}
}
/**
* @return the c08_TotalCreditos
*/
public Double getC08_TotalCreditos() {
return c08_TotalCreditos;
}
/**
* @param c08_TotalCreditos the c08_TotalCreditos to set
*/
public void setC08_TotalCreditos(Double c08_TotalCreditos) {
if (c08_TotalCreditos != null)
this.c08_TotalCreditos = c08_TotalCreditos;
}
public void setC08_TotalCreditos(String c08_TotalCreditos) {
if (c08_TotalCreditos != null && !"".equals(c08_TotalCreditos.trim()) ) {
this.c08_TotalCreditos = new Double( c08_TotalCreditos.trim() );
} else {
this.c08_TotalCreditos = Double.valueOf("0");
}
}
// ...
}
smooks映射如下：
private static final char CchrSeparator = ';';
// File mapping
private static final String CMulticashHeader = "c01_ClaveBanco,c02_Cuenta,c03_Consecutivo,c04_FechaMovimientos,c05_ClaveMoneda,c06_SaldoInicial,c07_TotalDebitos,"+
"c08_TotalCreditos,c09_SaldoFinal,c10_TipoCuenta,c11,c12,c13,c14,c15,c16,c17,c18_NumeroMovs";
smooks.setReaderConfig( new CSVReaderConfigurator( CMulticashHeader ).setBinding( new CSVBinding(
"balanceList", MulticashHeader.class, CSVBindingType.LIST )).setSeparatorChar(CchrSeparator) );
但是当处理c_06，c_07，c_08和c_09（不仅仅是零但是空）的空值的文件时，恰好是Double值，即使在POJO的属性设置器上设置函数重载也不起作用并抛出
Unable to filter InputStream for target profile [org.milyn.profile.Profile#default_profile].
org.milyn.SmooksException: Unable to filter InputStream for target profile [org.milyn.profile.Profile#default_profile].
at org.milyn.delivery.dom.SmooksDOMFilter.filter(SmooksDOMFilter.java:294)
at org.milyn.delivery.dom.SmooksDOMFilter.doFilter(SmooksDOMFilter.java:243)
at org.milyn.delivery.dom.SmooksDOMFilter.doFilter(SmooksDOMFilter.java:216)
at org.milyn.Smooks._filter(Smooks.java:516)
at org.milyn.Smooks.filterSource(Smooks.java:475)
at com.example.CSVParserServicio.runSmooksTransform(CSVParserServicio.java:98)
...
Caused by: org.milyn.javabean.DataDecodeException: Failed to decode binding value '' for property 'c07_TotalDebitos' on bean '9b06d0eb-9231-
4c49-a612-75ace2b5d44c'.
at org.milyn.javabean.BeanInstancePopulator.decodeDataString(BeanInstancePopulator.java:581)
at org.milyn.javabean.BeanInstancePopulator.decodeAndSetPropertyValue(BeanInstancePopulator.java:482)
at org.milyn.javabean.BeanInstancePopulator.bindDomDataValue(BeanInstancePopulator.java:384)
at org.milyn.javabean.BeanInstancePopulator.visitAfter(BeanInstancePopulator.java:319)
at org.milyn.delivery.dom.SmooksDOMFilter$ElementProcessor.processMapping(SmooksDOMFilter.java:778)
at org.milyn.delivery.dom.SmooksDOMFilter$ElementProcessor.process(SmooksDOMFilter.java:717)
at org.milyn.delivery.dom.SmooksDOMFilter$ElementProcessor.access$000(SmooksDOMFilter.java:666)
at org.milyn.delivery.dom.SmooksDOMFilter.filter(SmooksDOMFilter.java:385)
at org.milyn.delivery.dom.SmooksDOMFilter.filter(SmooksDOMFilter.java:317)
at org.milyn.delivery.dom.SmooksDOMFilter.filter(SmooksDOMFilter.java:292)
... 27 more
Caused by: org.milyn.javabean.DataDecodeException: Failed to decode Double value ''.
at org.milyn.javabean.decoders.DoubleDecoder.decode(DoubleDecoder.java:34)
at org.milyn.javabean.BeanInstancePopulator.decodeDataString(BeanInstancePopulator.java:579)
... 36 more
Caused by: java.lang.NumberFormatException: empty String
at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:992)
at java.lang.Double.parseDouble(Double.java:510)
at org.milyn.javabean.decoders.DoubleDecoder.decode(DoubleDecoder.java:32)
... 37 more
aoyone如何避免这种陷阱保持程序化方法？
---------------- EDIT ----------------： 正如汤姆所说，我在使用配置xml的smss示例中对csv-to-java进行了测试。我有这个并且错误重复：
<?xml version="1.0"?>
<smooks-resource-list xmlns="http://www.milyn.org/xsd/smooks-1.1.xsd"
xmlns:csv1="http://www.milyn.org/xsd/smooks/csv-1.3.xsd">
<csv1:reader fields="firstName,lastName,gender,age,country" separator=";">
<csv1:listBinding beanId="customerList" class="example.Customer"/>
</csv1:reader>
</smooks-resource-list>
文件是
charles;moulliard;Male;43;belgium
maxence;dewil;Male;;belgium
eleonor;moulliard;Female;12;belgium
（注意空白年龄）。而java主类是
private static String messageIn = readInputMessage();
Smooks smooks = new Smooks("/route/to/smooks-config.xml");
try {
ExecutionContext executionContext = smooks.createExecutionContext();
JavaResult result = new JavaResult();
smooks.filterSource(executionContext, new StringSource(messageIn), result);
return (List) result.getBean("customerList");
} finally {
smooks.close();
}
...
我发现这是汤姆的例子（!!!），所以我问：如何使用<jb:bean>将csv字段映射到POJO属性？
---------------- EDIT2 ----------------： 我尝试了在codehaus的JIRA线程中找到的东西，我得到了以下配置文件：
<?xml version="1.0"?>
<smooks-resource-list xmlns="http://www.milyn.org/xsd/smooks-1.1.xsd"
xmlns:csv1="http://www.milyn.org/xsd/smooks/csv-1.3.xsd"
xmlns:jb="http://www.milyn.org/xsd/smooks/javabean-1.1.xsd">
<csv1:reader fields="firstName,lastName,gender,age,country" separator=";" />
<jb:bindings beanId="customer" class="example.Customer" createOnElement="csv-record">
<jb:value property="firstName" data="csv-record/firstName" />
<jb:value property="lastName" data="csv-record/lastName" />
<jb:value property="gender" data="csv-record/gender" />
<jb:value property="age" data="csv-record/age" decoder="Integer" default="0" />
<jb:value property="country" data="csv-record/country" />
</jb:bindings>
<jb:bindings beanId="customerList" class="java.util.ArrayList" createOnElement="csv-set">
<jb:wiring beanIdRef="customer" />
</jb:bindings>
</smooks-resource-list>
使用带有前面显示的空整数（年龄）的CSV，但是当我将javabean xsd更新到1.1以上时它失败了。抛出错误
Exception in thread "main" org.xml.sax.SAXParseException: cvc-complex-type.2.4.a: Invalid content was found starting with element 'jb:bindings'. One of '{"http://www.milyn.org/xsd/smooks-1.1.xsd":abstract-reader, "http://www.milyn.org/xsd/smooks-1.1.xsd":abstract-resource-config}' is expected
¿我错过了什么吗？
答案 0 :(得分：2)
您正在使用CSV速记绑定机制，它不允许您指定默认值。我认为您的选择将是......
<jb:bean> configs或programmatic config。其中任何一个都可以指定默认值。