java json和object互换-阿里云开发者社区

java json和object互换

2017-11-15 950

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简介：

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

java json和object互换

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