以编程方式将smvs中的csv映射到java无法处理空Double
我正在使用smooks库快速简便地解析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，甚至在POJO的属性设置器上设置函数重载也不起作用并且抛出
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
anoyone如何避免这种陷阱保持程序化方法？
—————-编辑—————-：我在csv-to-java的smooks示例中对此进行了测试，汤姆说，使用配置xml。 我有这个，错误复制：
该文件是
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Tom的例子（!!!），所以我问：如何使用将csv字段映射到POJO属性？
—————- EDIT2 —————-：我尝试过在codehaus’JIRA线程中找到的东西，我得到了以下内容配置文件：
它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以上时失败。 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？
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……
- 修改CSVBinding代码以满足您的需求。
- 使用一个更详细的配置机制，即xml