package  com.help; 


import  java.io.IOException; 
import  java.io.InputStream; 
import  java.io.StringWriter; 
import  java.util.List; 


import  org.codehaus.jackson.JsonGenerationException; 
import  org.codehaus.jackson.JsonParseException; 
import  org.codehaus.jackson.map.JsonMappingException; 
import  org.codehaus.jackson.map.ObjectMapper; 


public   class  JsonFunc { 
static  ObjectMapper mapper =  new  ObjectMapper(); 


public   static  String toJSON(Object obj) { 
         StringWriter writer =  new  StringWriter(); 
          try  { 
                mapper.writeValue(writer, obj); 
         }  catch  (JsonGenerationException e) { 
                 throw   new  RuntimeException(e); 
         }  catch  (JsonMappingException e) { 
                 throw   new  RuntimeException(e); 
         }  catch  (IOException e) { 
                 throw   new  RuntimeException(e); 
         } 
          return  writer.toString(); 
} 

public   static  <T> T fromJSON(String json, Class<T> clazz) { 
         ObjectMapper mapper =  new  ObjectMapper(); 
          try  { 
                 return  mapper.readValue(json, clazz); 
         }  catch  (JsonParseException e) { 
                 throw   new  RuntimeException(e); 
         }  catch  (JsonMappingException e) { 
                 throw   new  RuntimeException(e); 
         }  catch  (IOException e) { 
                 throw   new  RuntimeException(e); 
         } 
    } 
public   static  <T> T fromJSON(InputStream json, Class<T> clazz) { 
         ObjectMapper mapper =  new  ObjectMapper(); 
          try  { 
                 return  mapper.readValue(json, clazz); 
         }  catch  (JsonParseException e) { 
                 throw   new  RuntimeException(e); 
         }  catch  (JsonMappingException e) { 
                 throw   new  RuntimeException(e); 
         }  catch  (IOException e) { 
                 throw   new  RuntimeException(e); 
         } 
    } 
public   static  List<String> getJsonList(String jstr,List<String> li) 
{ 
char [] cstr = jstr.toCharArray(); 
boolean  bend =  false ; 
int  istart =0; 
int  iend =0; 
for ( int  i=0 ; i < cstr.length; i++) 
{ 
if  ((cstr[i] == '{') && !bend) 
{ 
istart = i; 
} 
if  (cstr[i] == '}' && !bend) 
{ 
iend = i; 
bend =  true ; 
} 
} 

if  (istart !=0) 
{ 
String substr = jstr.substring(istart, iend+1); 
jstr = jstr.substring(0,istart-1) + jstr.substring(iend+1,jstr.length()); 
substr = substr.replace( ",\"children\":" , ""); 
substr = substr.replace( "]" , ""); 
substr = substr.replace( "[" , ""); 
    li.add(substr); 
    getJsonList(jstr,li); 
} 
return  li; 
} 

}

本文转自elbertchen 51CTO博客，原文链接：http://blog.51cto.com/linkyou/751930，如需转载请自行联系原作者