Java JSON库常用资源

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Java常用JSON库

  • Gson
  • Json-lib
  • Jackson
  • FastJson

Json-lib

Maven依赖:

<dependency>
    <groupId>net.sf.json-lib</groupId>
    <artifactId>json-lib</artifactId>
    <version>2.4</version>
    <classifier>jdk15</classifier>
</dependency>

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import net.sf.json.JSONObject;

public class JsonObjectUtil {

    public static String bean2Json(Object obj){
        JSONObject jsonObject=JSONObject.fromObject(obj);
        return jsonObject.toString();
    }
    
    @SuppressWarnings("unchecked")
    public static <T> T json2Bean(String jsonStr,Class<T> objClass){
        return (T)JSONObject.toBean(JSONObject.fromObject(jsonStr), objClass);
    }
    
}

Gson

Maven依赖:

<dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>2.5</version>
</dependency>

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import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonElement;
import com.google.gson.JsonParser;

public class GsonUtil {
    private static Gson gson = new GsonBuilder().create();
    
    public static String bean2Json(Object obj){
        return gson.toJson(obj);
    }
    
    public static <T> T json2Bean(String jsonStr,Class<T> objClass){
        return gson.fromJson(jsonStr, objClass);
    }
    
    public static String jsonFormatter(String uglyJsonStr){
        Gson gson = new GsonBuilder().setPrettyPrinting().create();
        JsonParser jp = new JsonParser();
        JsonElement je = jp.parse(uglyJsonStr);
        String prettyJsonString = gson.toJson(je);
        return prettyJsonString;
    }
}

Jackson

Maven依赖:

<dependency>
    <groupId>org.codehaus.jackson</groupId>
    <artifactId>jackson-mapper-asl</artifactId>
    <version>1.9.13</version>
</dependency>

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import java.io.IOException;
import java.io.StringWriter;

import org.codehaus.jackson.JsonFactory;
import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.JsonParseException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;

public class JacksonUtil {
    private static ObjectMapper mapper = new ObjectMapper();
    
    public static String bean2Json(Object obj) throws IOException {
        StringWriter sw = new StringWriter();
        JsonGenerator gen = new JsonFactory().createJsonGenerator(sw);
        mapper.writeValue(gen, obj);
        gen.close();
        return sw.toString();
    }

    public static <T> T json2Bean(String jsonStr, Class<T> objClass)
            throws JsonParseException, JsonMappingException, IOException {
        return mapper.readValue(jsonStr, objClass);
    }
}

FastJson

Maven依赖:

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.7</version>
</dependency>

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import com.alibaba.fastjson.JSON;

public class FastJsonUtil {
    public static String bean2Json(Object obj){
        return JSON.toJSONString(obj);
    }
    
    public static <T> T json2Bean(String jsonStr,Class<T> objClass){
        return JSON.parseObject(jsonStr, objClass);
    }
}