Jackson处理java对象，json，xml间转换

最新推荐文章于 2025-06-16 09:19:33 发布

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最新推荐文章于 2025-06-16 09:19:33 发布

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本文提供了一个使用Jackson库实现的Java方法，用于将对象转换为JSON字符串，将JSON字符串转换为对象，以及将JSON字符串转换为Map或List。同时提供了将JSON转换为XML和从XML转换为JSON的方法。

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原文：http://blog.sina.com.cn/s/blog_994766510101dxnd.html

需要jar包：jackson-annotations-2.3.0.jar，jackson-core-2.3.0.jar，jackson-databind-2.1.3.jar，jackson-dataformat-xml-2.1.3.jar，stax2-2.1.jar

private static ObjectMapper objectMapper = new ObjectMapper();
    private static XmlMapper xmlMapper = new XmlMapper();

    public static String obj2json(Object obj) throws Exception{
        return objectMapper.writeValueAsString(obj);
    }


    public static T json2pojo(String jsonStr,Class clazz) throws Exception{
        return objectMapper.readValue(jsonStr, clazz);
    }


    public static Map json2map(String jsonStr)throws Exception{
        return objectMapper.readValue(jsonStr, Map.class);
    }


    public static Map json2map(String jsonStr,Class clazz)throws Exception{
        Map> map =  objectMapper.readValue(jsonStr, new TypeReference>() {
        });
        Map result = new HashMap();
        for (Entry> entry : map.entrySet()) {
            result.put(entry.getKey(), map2pojo(entry.getValue(), clazz));
        }
        return result;
    }


    public static List json2list(String jsonArrayStr,Class clazz)throws Exception{
        List> list = objectMapper.readValue(jsonArrayStr, new TypeReference>() {
        });
        List result = new ArrayList();
        for (Map map : list) {
            result.add(map2pojo(map, clazz));
        }
        return result;
    }


    public static T map2pojo(Map map,Class clazz){
        return objectMapper.convertValue(map, clazz);
    }


    public static String json2xml(String jsonStr)throws Exception{
        JsonNode root = objectMapper.readTree(jsonStr);
        String xml = xmlMapper.writeValueAsString(root);
        return xml;
    }


    public static String xml2json(String xml){
        StringWriter w = new StringWriter();
        JsonParser jp;
        try {
            jp = xmlMapper.getFactory().createParser(xml);
            JsonGenerator jg = objectMapper.getFactory().createGenerator(w);
            while (jp.nextToken() != null) {
                jg.copyCurrentEvent(jp);
            }
            jp.close();
            jg.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

        return w.toString();
    }