json对象互转

最新推荐文章于 2024-03-06 14:09:46 发布

原创最新推荐文章于 2024-03-06 14:09:46 发布 · 745 阅读

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#Java #json

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本文介绍了一个实用的Java工具类，用于实现Java对象与JSON字符串之间的相互转换。该工具类利用了`JsonFactory`、`JsonGenerator`及`ObjectMapper`等组件，提供了稳定可靠的转换方法。

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

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

/**
* 将对象转json,json转对象
*
* @author pan
*
*/
public class JsonUtil {

public static String obj2Json(Object obj) {

StringWriter stringWriter = new StringWriter();
JsonGenerator jsonGenerator = null;
try {
jsonGenerator = new JsonFactory().createJsonGenerator(stringWriter);
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.writeValue(jsonGenerator, obj);
} catch (IOException e) {
// TODO 记录日志
e.printStackTrace();
} finally {
if (null != jsonGenerator) {
try {
jsonGenerator.close();
} catch (IOException e) {
// TODO 记录日志
e.printStackTrace();
}
}
}
return stringWriter.getBuffer().toString();
}

public static <T> T json2Obj(String json, Class<T> cls) {

ObjectMapper mapper = new ObjectMapper();
T o = null;
try {
o = mapper.readValue(json, cls);
return o;
} catch (Exception e) {
e.printStackTrace();
}
return o;
}
}