JSON解析处理

package com.mayn.common.json;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.ObjectWriter;

/**

• JSON解析处理

*/
public class JSON
{
public static final String DEFAULT_FAIL = ""Parse failed"";
private static final ObjectMapper objectMapper = new ObjectMapper();
private static final ObjectWriter objectWriter = objectMapper.writerWithDefaultPrettyPrinter();

public static void marshal(File file, Object value) throws Exception
{
    try
    {
        objectWriter.writeValue(file, value);
    }
    catch (JsonGenerationException e)
    {
        throw new Exception(e);
    }
    catch (JsonMappingException e)
    {
        throw new Exception(e);
    }
    catch (IOException e)
    {
        throw new Exception(e);
    }
}

public static void marshal(OutputStream os, Object value) throws Exception
{
    try
    {
        objectWriter.writeValue(os, value);
    }
    catch (JsonGenerationException e)
    {
        throw new Exception(e);
    }
    catch (JsonMappingException e)
    {
        throw new Exception(e);
    }
    catch (IOException e)
    {
        throw new Exception(e);
    }
}

public static String marshal(Object value) throws Exception
{
    try
    {
        return objectWriter.writeValueAsString(value);
    }
    catch (JsonGenerationException e)
    {
        throw new Exception(e);
    }
    catch (JsonMappingException e)
    {
        throw new Exception(e);
    }
    catch (IOException e)
    {
        throw new Exception(e);
    }
}

public static byte[] marshalBytes(Object value) throws Exception
{
    try
    {
        return objectWriter.writeValueAsBytes(value);
    }
    catch (JsonGenerationException e)
    {
        throw new Exception(e);
    }
    catch (JsonMappingException e)
    {
        throw new Exception(e);
    }
    catch (IOException e)
    {
        throw new Exception(e);
    }
}

public static <T> T unmarshal(File file, Class<T> valueType) throws Exception
{
    try
    {
        return objectMapper.readValue(file, valueType);
    }
    catch (JsonParseException e)
    {
        throw new Exception(e);
    }
    catch (JsonMappingException e)
    {
        throw new Exception(e);
    }
    catch (IOException e)
    {
        throw new Exception(e);
    }
}

public static <T> T unmarshal(InputStream is, Class<T> valueType) throws Exception
{
    try
    {
        return objectMapper.readValue(is, valueType);
    }
    catch (JsonParseException e)
    {
        throw new Exception(e);
    }
    catch (JsonMappingException e)
    {
        throw new Exception(e);
    }
    catch (IOException e)
    {
        throw new Exception(e);
    }
}

public static <T> T unmarshal(String str, Class<T> valueType) throws Exception
{
    try
    {
        return objectMapper.readValue(str, valueType);
    }
    catch (JsonParseException e)
    {
        throw new Exception(e);
    }
    catch (JsonMappingException e)
    {
        throw new Exception(e);
    }
    catch (IOException e)
    {
        throw new Exception(e);
    }
}

public static <T> T unmarshal(byte[] bytes, Class<T> valueType) throws Exception
{
    try
    {
        if (bytes == null)
        {
            bytes = new byte[0];
        }
        return objectMapper.readValue(bytes, 0, bytes.length, valueType);
    }
    catch (JsonParseException e)
    {
        throw new Exception(e);
    }
    catch (JsonMappingException e)
    {
        throw new Exception(e);
    }
    catch (IOException e)
    {
        throw new Exception(e);
    }
}

}