java - 传递小数时收到 "Not a valid char constructor input"错误

Question

传递十进制时，我收到“不是有效的字符构造函数输入”。我的代码如下。我研究并发现通过从 BigDecimal 更改为 Formatdeciaml 可以解决问题，但我不能这样做，因为那样我的映射器也需要更改。任何帮助将不胜感激!!

Controller

  String postagePaid = (String) request.getParameter("tPostagePaid");
                String insuranceFees = (String) request.getParameter("tInsuranceFees");
                String registeredFees = (String) request.getParameter("tRegisteredFees");
                String codFees = (String) request.getParameter("tCODFees");
                String insRegisteredCODFees = (String) request.getParameter("tInsuranceFees");
                System.out.println("insurance Fee: " + insuranceFees);
                if (postagePaid != null && !insuranceFees.isEmpty()) { // postage paid amount
                    claim.setClPostagePaidAmt(new BigDecimal(postagePaid));
                }
                if (insuranceFees != null && !insuranceFees.isEmpty()) { // Insurance Fees
                    claim.setClInsuranceFee(new BigDecimal(insuranceFees));
                }
                if (registeredFees != null && !insuranceFees.isEmpty()) { // Registered Fees
                    claim.setClRegisteredFee(new BigDecimal(registeredFees));
                }
                if (codFees != null && !insuranceFees.isEmpty()) { // COD Fees
                    claim.setClCodFee(new BigDecimal(codFees));
                }
                claim.setClInsRegCodAmt(null);

错误:

Caused by: java.lang.NumberFormatException: Not a valid char constructor input: 
at java.math.BigDecimal.bad(BigDecimal.java:1859)
at java.math.BigDecimal.charParser(BigDecimal.java:1303)
at java.math.BigDecimal.<init>(BigDecimal.java:922)
at java.math.BigDecimal.<init>(BigDecimal.java:901)
at   gov.usps.oic.controller.OicClaimEntryControlloer.submitClaim(OicClaimEntryControlloer.java:991)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:611)
at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:953)

Answer 1

根据您的评论，这个问题最终是关于获取未知输入并将其解析为 BigDecimal。您可以使用正则表达式从 String 中获取数值。

public class Program {  
    private static Object lock = new Object();
    private static final Pattern BIG_DECIMAL_MATCHER;

    static {
        synchronized (lock) {
            BIG_DECIMAL_MATCHER = Pattern.compile("-?(?:\\d+(?:\\.\\d+)?|\\.\\d+)"); 
            // credit to stackoverflow.com/questions/14343551
        }
    }

    /**
     * Attempts to force a given String value to a valid BigDecimal. If there are 
     * multiple valid BigDecimal values, only the first is returned.
     */
    static BigDecimal forceBigDecimal(String value) { 
        Matcher moneyMatcher = BIG_DECIMAL_MATCHER.matcher(value);

        while (moneyMatcher.find()) {
            return new BigDecimal(moneyMatcher.group());
        }
        throw new NumberFormatException(
            String.format("Valid number not found in value: %s", value));
    }
}

使用示例:

List<String> moneyValues = new ArrayList<String>() {{
    add("$42.35"); add("Fee: $10.25"); add("฿1200");
    add("obviously not valid input"); 
    add("not too 42 sure . 12about this one"); 
    add("or this $..3"); 
    add("$42.35 $84.50");
}};

for (String value : moneyValues) {
    try {   
        BigDecimal parsed = Program.forceBigDecimal(value); 
        System.out.println(parsed);
    } catch (NumberFormatException ex) { 
        ex.printStackTrace();
        continue;
    }
}

输出:

42.35
10.25
1200
java.lang.NumberFormatException: Valid number not found in value: obviously not valid input
    at soj25597001.Program.forceBigDecimal(Program.java:50)
    at soj25597001.Program.main(Program.java:22)
42
0.3
42.35