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;
 }
 }