判断字符串string是数字、json结构、xml结构、double、float

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; 
} 

ScriptEngineManager sem =  new  ScriptEngineManager ();
        ScriptEngine se = sem.getEngineByName ( "js" );
        String jsonstr =  "({name: 1, obj: 3,[dd]})" ;
        try
        {
            System.out.println (se.eval (jsonstr));
        }
        catch  (ScriptException e)
        {
            System.out.println ( "json格式有误" );
        }

/** 
* 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; 
} 
}