判断字符串string是数字、json结构、xml结构

 1 import org.json.JSONException;   
 2 import org.json.JSONObject;   
 3 import org.dom4j.DocumentException;   
 4 import org.dom4j.DocumentHelper;   
 5   
 6 public class StringTest {   
 7   
 8 /**  
 9 * @param args  
10 */   
11 public static void main(String[] args) {   
12 String string1 = "123";   
13 String string2 = "fdgsewe323";   
14 String string3 = "{/"task/":/"324vfsdfg/"}";   
15 String string4 = "3243";   
16 //  System.out.println("string1::number"+isNumber(string1));   
17 //  System.out.println("string2::number"+isNumber(string2));   
18 //  System.out.println("string3::json"+isJson(string3));   
19 //  System.out.println("string4::xml"+isXML(string4));   
20 //  System.out.println("string1::json"+isJson(string1));   
21 //  System.out.println("string2::xml"+isXML(string2));   
22 //  System.out.println("string3::number"+isNumber(string3));   
23 //  System.out.println("string4::xml"+isXML(string4));   
24   
25 System.out.println("string1::"+getType(string1));   
26 System.out.println("string2::"+getType(string2));   
27 System.out.println("string3::"+getType(string3));   
28 System.out.println("string4::"+getType(string4));   
29 }   
30   
31 public static String getType(String string) {   
32 if (isNumber(string))   
33 return "Number";   
34 else if (isJson(string))   
35 return "Json";   
36 else if (isXML(string))   
37 return "xml";   
38 else   
39 return "String";   
40 }   
41   
42   
43 /**  
44 * 判断字符串是否是数字  
45 */   
46 public static boolean isNumber(String value) {   
47 return isInteger(value) || isDouble(value);   
48 }   
49   
50 /**  
51 * 判断字符串是否是整数  
52 */   
53 public static boolean isInteger(String value) {   
54 try {   
55 Integer.parseInt(value);   
56 return true;   
57 } catch (NumberFormatException e) {   
58 return false;   
59 }   
60 }   
61   
62 /**  
63 * 判断字符串是否是浮点数  
64 */   
65 public static boolean isDouble(String value) {   
66 try {   
67 Double.parseDouble(value);   
68 if (value.contains("."))   
69 return true;   
70 return false;   
71 } catch (NumberFormatException e) {   
72 return false;   
73 }   
74 }   
75   
76 /**  
77 * 判断是否是json结构  
78 */   
79 public static boolean isJson(String value) {   
80 try {   
81 new JSONObject(value);   
82 } catch (JSONException e) {   
83 return false;   
84 }   
85 return true;   
86 }   
87   
88 /**  
89 * 判断是否是xml结构  
90 */   
91 public static boolean isXML(String value) {   
92 try {   
93 DocumentHelper.parseText(value);   
94 } catch (DocumentException e) {   
95 return false;   
96 }   
97 return true;   
98 }   
99 }   

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