判断字符串string是数字、json结构、xml结构

import org.json.JSONException;   
import org.json.JSONObject;   
import org.dom4j.DocumentException;   
import org.dom4j.DocumentHelper;   
  
public class StringTest {   
  
/**  
* @param args  
*/   
public static void main(String[] args) {   
String string1 = "123";   
String string2 = "fdgsewe323";   
String string3 = "{/"task/":/"324vfsdfg/"}";   
String string4 = "<ww>3243</ww>";   
//  System.out.println("string1::number"+isNumber(string1));   
//  System.out.println("string2::number"+isNumber(string2));   
//  System.out.println("string3::json"+isJson(string3));   
//  System.out.println("string4::xml"+isXML(string4));   
//  System.out.println("string1::json"+isJson(string1));   
//  System.out.println("string2::xml"+isXML(string2));   
//  System.out.println("string3::number"+isNumber(string3));   
//  System.out.println("string4::xml"+isXML(string4));   
  
System.out.println("string1::"+getType(string1));   
System.out.println("string2::"+getType(string2));   
System.out.println("string3::"+getType(string3));   
System.out.println("string4::"+getType(string4));   
}   
  
public static String getType(String string) {   
if (isNumber(string))   
return "Number";   
else if (isJson(string))   
return "Json";   
else if (isXML(string))   
return "xml";   
else   
return "String";   
}   
  
  
/**  
* 判断字符串是否是数字  
*/   
public static boolean isNumber(String value) {   
return isInteger(value) || isDouble(value);   
}   
  
/**  
* 判断字符串是否是整数  
*/   
public static boolean isInteger(String value) {   
try {   
Integer.parseInt(value);   
return true;   
} catch (NumberFormatException e) {   
return false;   
}   
}   
  
/**  
* 判断字符串是否是浮点数  
*/   
public static boolean isDouble(String value) {   
try {   
Double.parseDouble(value);   
if (value.contains("."))   
return true;   
return false;   
} catch (NumberFormatException e) {   
return false;   
}   
}   
  
/**  
* 判断是否是json结构  
*/   
public static boolean isJson(String value) {   
try {   
new JSONObject(value);   
} catch (JSONException e) {   
return false;   
}   
return true;   
}   
  
/**  
* 判断是否是xml结构  
*/   
public static boolean isXML(String value) {   
try {   
DocumentHelper.parseText(value);   
} catch (DocumentException e) {   
return false;   
}   
return true;   
}   
}