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;
    }
}