com.iterzp.momo.utils.JsonUtils.java Source code

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Here is the source code for com.iterzp.momo.utils.JsonUtils.java

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/*
 * Copyright 2005-2013 iterzp.com. All rights reserved.
 * Support: http://www.iterzp.com
 * License: http://www.iterzp.com/license
 */
package com.iterzp.momo.utils;

import java.io.IOException;
import java.io.Writer;

import org.springframework.util.Assert;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.type.JavaType;
import org.codehaus.jackson.type.TypeReference;

/**
 * Utils - JSON
 * 
 * @author yd14 Team
 * @version 3.0
 */
public final class JsonUtils {

    /** ObjectMapper */
    private static ObjectMapper mapper = new ObjectMapper();

    /**
     * ??
     */
    private JsonUtils() {
    }

    /**
     * ?JSON
     * 
     * @param value
     *            
     * @return JSOn
     */
    public static String toJson(Object value) {
        try {
            return mapper.writeValueAsString(value);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * JSON?
     * 
     * @param json
     *            JSON
     * @param valueType
     *            
     * @return 
     */
    public static <T> T toObject(String json, Class<T> valueType) {
        Assert.hasText(json);
        Assert.notNull(valueType);
        try {
            return mapper.readValue(json, valueType);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * JSON?
     * 
     * @param json
     *            JSON
     * @param typeReference
     *            
     * @return 
     */
    public static <T> T toObject(String json, TypeReference<?> typeReference) {
        Assert.hasText(json);
        Assert.notNull(typeReference);
        try {
            return mapper.readValue(json, typeReference);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * JSON?
     * 
     * @param json
     *            JSON
     * @param javaType
     *            
     * @return 
     */
    public static <T> T toObject(String json, JavaType javaType) {
        Assert.hasText(json);
        Assert.notNull(javaType);
        try {
            return mapper.readValue(json, javaType);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * ?JSON?
     * 
     * @param writer
     *            writer
     * @param value
     *            
     */
    public static void writeValue(Writer writer, Object value) {
        try {
            mapper.writeValue(writer, value);
        } catch (JsonGenerationException e) {
            e.printStackTrace();
        } catch (JsonMappingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}