toJSONString

Fastjson将Java对象序列化为JSON字符串，fastjson提供了一个最简单的入口

package com.alibaba.fastjson;
public abstract class JSON {
    public static String toJSONString(Object object);
}

Sample

import com.alibaba.fastjson.JSON;
Model model = new Model();
model.id = 1001;
String json = JSON.toJSONString(model);

writeJSONString

Fastjson在1.2.11版本中，JSON类新增对OutputStream/Writer直接支持。

package com.alibaba.fastjson;
public abstract class JSON {
   public static final int writeJSONString(OutputStream os, // 
                                             Object object, // 
                                             SerializerFeature... features) throws IOException;
    public static final int writeJSONString(OutputStream os, //
                                             Charset charset, //  
                                             Object object, // 
                                             SerializerFeature... features) throws IOException;
   public static final int writeJSONString(Writer os, // 
                                             Object object, // 
                                             SerializerFeature... features) throws IOException;
}

Sample

import com.alibaba.fastjson;
import java.nio.charset.Charset;
class Model {
public int value;
}
Model model = new Model();
model.value = 1001;
OutputStream os = ...;
JSON.writeJSONString(os, model);
JSON.writeJSONString(os, Charset.from("GB18030"), model);
Writer writer = ...;
JSON.writeJSONString(os, model);

parseObject：在1.2.11版本中，fastjson新增加了对InputStream的支持支持。

package com.alibaba.fastjson;
public abstract class JSON {
    public static <T> T parseObject(InputStream is, //
                                    Type type, //
                                    Feature... features) throws IOException;
    public static <T> T parseObject(InputStream is, //
                                    Charset charset, //
                                    Type type, //
                                    Feature... features) throws IOException;
}

Sample

import com.alibaba.fastjson;
import java.nio.charset.Charset;
class Model {
    public int value;
}
InputStream is = ...
Model model = JSON.parseObject(is, Model.class);
Model model2 = JSON.parseObject(is, Charset.from("UTF-8"), Model.class);

下一节：Fastjson当需要处理超大JSON文本时，需要Stream API，在fastjson-1.1.32版本中开始提供Stream API。

Fastjson toJSONString、writeJSONString

toJSONString

writeJSONString