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 = "<ww>3243</ww>";   
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 }