使用jackson转换xml为hashmap形式

  jackson这个开源包其实是个好东西,是对json转换进行的好东西。今天看到一个例子，综合
使用了apache common的ioutil包，jackson结合的例子，是将一个文件读入的XML转换为hashmap,

例子如下：

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import net.sf.json.JSON;
import net.sf.json.xml.XMLSerializer;

import org.apache.commons.io.IOUtils;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.type.TypeReference;

public class XML2JSONConvertor {
public static void main(String[] args) throws Exception {

InputStream is = new FileInputStream(new File(
“e:\\jagannathan\\personal\\java-projects\\secondtest.xml”));
String xml = IOUtils.toString(is);

XMLSerializer xmlSerializer = new XMLSerializer();
JSON json = xmlSerializer.read(xml);

System.out.println(json.toString(2));

printJSON(json.toString(2));

}

public static void printJSON(String jsonString) {
ObjectMapper mapper = new ObjectMapper();

try {

Map<String, Object> jsonInMap = mapper.readValue(jsonString,
new TypeReference<Map<String, Object>>() {
});

List<String> keys = new ArrayList<String>(jsonInMap.keySet());

for (String key : keys) {
System.out.println(key + “: ” + jsonInMap.get(key));
}

} catch (JsonGenerationException e) {
e.printStackTrace();
} catch (JsonMappingException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}

比如一个XML为：

<?xml version=”1.0″ encoding=”UTF-8″?>
<company>
<name>Jags Inc</name>
<employees>
<employee>
<name>Jagan</name>
<sex>Male</sex>
<dob>24-jul</dob>
</employee>
<employee>
<name>Satya</name>
<sex>Male</sex>
<dob>24-apr</dob>
</employee>
</employees>
</company>

  则可以看到jackson输出的map形式的输出：

7 Feb, 2013 7:20:50 PM net.sf.json.xml.XMLSerializer getType
INFO: Using default type string
{
“name”: “Jags Inc”,
“employees”: [
{
"name": "Jagan",
"sex": "Male",
"dob": "24-jul"
},
{
"name": "Satya",
"sex": "Male",
"dob": "24-apr"
}
]
}
name: Jags Inc
employees: [{name=Jagan, sex=Male, dob=24-jul}, {name=Satya, sex=Male, dob=24-apr}]

   可以看到，jackson其实还是比较快的，听说测评比json-lib快，可以一用