是否可以通过使用XStream解析来忽略空格：
public class TestTest {
@Test
public void smokeTest() {
InputStream file = TestTest.class.getResourceAsStream("TestTest.xml");
XStream xStream = new XStream();
xStream.ignoreUnknownElements();
xStream.processAnnotations(Mother.class);
Mother mother = (Mother) xStream.fromXML(file);
}
@XStreamAlias("mother")
public class Mother {
@XStreamAsAttribute
public String name;
public int age;
}
}
XML：
<?xml version="1.0" encoding="UTF-8"?>
<mother name="Jenny">
<age> 33 </age>
</mother>
错误：
com.thoughtworks.xstream.converters.ConversionException: For input string: " 33 " : For input string: " 33 "
---- Debugging information ----
message : For input string: " 33 "
cause-exception : java.lang.NumberFormatException
cause-message : For input string: " 33 "
class : java.lang.Integer
required-type : java.lang.Integer
converter-type : com.thoughtworks.xstream.converters.SingleValueConverterWrapper
wrapped-converter : com.thoughtworks.xstream.converters.basic.IntConverter
path : /mother/age
line number : 3
class[1] : de.mosst.xstream.test.TestTest$Mother
converter-type[1] : com.thoughtworks.xstream.converters.reflection.ReflectionConverter
version : 1.4.7
-------------------------------
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:79)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshallField(AbstractReflectionConverter.java:474)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:406)
at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:257)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)
at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134)
at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32)
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1185)
at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1169)
at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1049)
at de.mosst.xstream.test.TestTest.smokeTest(TestTest.java:30)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: java.lang.NumberFormatException: For input string: " 33 "
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Long.parseLong(Long.java:578)
at java.lang.Long.valueOf(Long.java:776)
at java.lang.Long.decode(Long.java:928)
at com.thoughtworks.xstream.converters.basic.IntConverter.fromString(IntConverter.java:27)
at com.thoughtworks.xstream.converters.SingleValueConverterWrapper.fromString(SingleValueConverterWrapper.java:41)
at com.thoughtworks.xstream.converters.SingleValueConverterWrapper.unmarshal(SingleValueConverterWrapper.java:49)
at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
... 38 more
答案 0 :(得分：3)
我没有找到修剪字符串值的选项。
您可以添加一个自定义转换器来修剪空格：
xStream.registerConverter(new IntConverter() {
@Override
public Object fromString(String str) {
return super.fromString(str.trim());
}
});
或者，您可以为所有SingleValueConverters添加包装器以预处理输入：
XStream xStream = new XStream() {
@Override
public void registerConverter(SingleValueConverter converter, int priority) {
SingleValueConverter stringPreprocessor = new SingleValueConverterWrapper(converter) {
@Override
public Object fromString(String str) {
// You can trim whitespace or do other preprocessing here
return converter.fromString(str.trim());
}
};
super.registerConverter(stringPreprocessor, priority);
}
};