Wednesday, July 13th, 2011
Introduction
JDK6 and JAXB2.x (which comes with JDK6) make marshalling Java to XML and unmarshalling XML to Java a snap, almost trivial.
Example
Java to XML
package foo.bar;
import java.math.BigDecimal;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
public class JavaToXML {
public static void main(String[] args) throws Exception {
JAXBContext context = JAXBContext.newInstance(Product.class);
Marshaller m = context.createMarshaller();
m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
Product object = new Product();
object.setCode("WI1");
object.setName("Widget Number One");
object.setPrice(BigDecimal.valueOf(300.00));
m.marshal(object, System.out);
}
}
XML to Java
package foo.bar;
import java.io.File;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
public class XMLToJava {
public static void main(String[] args) {
try {
JAXBContext jc = JAXBContext.newInstance(Product.class);
Unmarshaller u = jc.createUnmarshaller();
File f = new File("product.xml");
Product product = (Product) u.unmarshal(f);
System.out.println(product.getCode());
System.out.println(product.getName());
System.out.println(product.getPrice());
} catch (JAXBException e) {
e.printStackTrace();
}
}
}
product.java
Note: the @XmlRootElement is vital here!
package foo.bar;
import java.math.BigDecimal;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement
public class Product {
private String code;
private String name;
private BigDecimal price;
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public BigDecimal getPrice() {
return price;
}
public void setPrice(BigDecimal price) {
this.price = price;
}
}
product.xml
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<product>
<code>WI1</code>
<name>Widget Number One</name>
<price>300.0</price>
</product>
Tags: java, jaxb, xml
Posted in Examples | No Comments »
Friday, June 24th, 2011
Background
When parsing XML you receive the following error:
...The Processing Instruction Target Matching "[xX][mM][lL]" is Not Allowed...
Solution
The chances are you have some sort of whitespace (or control character) infront of your XML declaration:
..<?xml version="1.0" encoding="utf-8"?>
It may even be that you have more than one XML declaration in the document..!
Tags: xml
Posted in quick tips | No Comments »
Thursday, June 16th, 2011
Introduction
I’m always Googling for a way to do this. This seems to be the best “idiomatic” solution I’ve found. So without further ado…
Example
public String readFile(String path) throws IOException {
FileInputStream stream = new FileInputStream(new File(path));
try{
FileChannel fc = stream.getChannel();
MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
return Charset.defaultCharset().decode(bb).toString();
}
finally {
stream.close();
}
}
Tags: java
Posted in Development, How to's, quick tips | No Comments »
Wednesday, May 11th, 2011
select trigger_body from user_triggers where trigger_name = 'XXXXX'
Tags: oracle, sql
Posted in quick tips | No Comments »
Thursday, May 5th, 2011
Introduction
I realise that the thought of Unit Testing private methods in Java classes can be like a red rag to a bull for some people and I understand the arguments.
Therefore, I present the following as a “how to”, not a moral argument for or against!
Example
The class under test
public class Product() {
private String privateMethod(String id) {
//Do something private
return "product_" + id;
}
}
The (Reflection Based) Unit Test
import java.lang.reflect.Method;
import static org.junit.Assert.*;
import org.junit.Test;
public class ProductTest {
private Product product; // the class under test
private Method m;
private static String METHOD_NAME = "privateMethod";
private Class[] parameterTypes;
private Object[] parameters;
@Before
public void setUp() throws Exception {
product = new Product();
parameterTypes = new Class[1];
parameterTypes[0] = java.lang.String.class;
m = product.getClass().getDeclaredMethod(METHOD_NAME, parameterTypes);
m.setAccessible(true);
parameters = new Object[1];
}
@Test
public void testPrivateMethod() throws Exception {
parameters[0] = "someIdentifier";
String result = (String) m.invoke(product, parameters);
//Do your assertions
assertNotNull(result);
}
}
Update
I’ve since been told that if dp4j.jar is in the classpath at compile-time, it will inject the necessary reflection to make this work. I haven’t had time to try this yet so YMMV.
Tags: java, junit, testing
Posted in Development, How to's | No Comments »
