猴王牌
2013-04-26 16:55
采纳率: 0%
浏览 351
已采纳

如何使用jackson反序列化json到对象

[code="java"]
{"indexs":[{"id":"6310_2","createTime":1359424596001,"indexFields":[{"name":"keyword_score","type":1,"analyzed":true,"highlight":true,"strValue":"2.1781344","longValue":0,"intValue":0},{"name":"object_id","type":1,"analyzed":true,"highlight":true,"strValue":"6310","longValue":0,"intValue":0},{"name":"object_type","type":1,"analyzed":true,"highlight":true,"strValue":"2","longValue":0,"intValue":0},{"name":"user_id","type":1,"analyzed":true,"highlight":true,"strValue":"657","longValue":0,"intValue":0},{"name":"user_name","type":1,"analyzed":true,"highlight":true,"strValue":"好书推荐","longValue":0,"intValue":0},{"name":"publish_time","type":1,"analyzed":true,"highlight":true,"strValue":"1324892396000","longValue":0,"intValue":0},{"name":"name","type":1,"analyzed":true,"highlight":true,"strValue":"水浒传","longValue":0,"intValue":0}]}]}

[/code]

当前Indexs中只有一个Index对象
多格式 如何反序列化成Index的集合

求大家指点

对象类型格式如下
[img]http://dl.iteye.com/upload/picture/pic/125114/446fc4dc-8a25-347b-9446-128a555e9aa5-thumb.png[/img]

  • 写回答
  • 关注问题
  • 收藏
  • 邀请回答

3条回答 默认 最新

  • Dead_Knight 2013-04-26 20:45
    已采纳

    写个完整的,供你参考:
    [code="java"]
    import java.util.List;

    import org.codehaus.jackson.JsonNode;
    import org.codehaus.jackson.map.ObjectMapper;

    public class TestJackson {
    private static String json = "{\"indexs\":[{\"id\":\"6310_2\",\"createTime\":1359424596001,\"indexFields\":[{\"name\":\"keyword_score\",\"type\":1,\"analyzed\":true,\"highlight\":true,\"strValue\":\"2.1781344\",\"longValue\":0,\"intValue\":0},{\"name\":\"object_id\",\"type\":1,\"analyzed\":true,\"highlight\":true,\"strValue\":\"6310\",\"longValue\":0,\"intValue\":0},{\"name\":\"object_type\",\"type\":1,\"analyzed\":true,\"highlight\":true,\"strValue\":\"2\",\"longValue\":0,\"intValue\":0},{\"name\":\"user_id\",\"type\":1,\"analyzed\":true,\"highlight\":true,\"strValue\":\"657\",\"longValue\":0,\"intValue\":0},{\"name\":\"user_name\",\"type\":1,\"analyzed\":true,\"highlight\":true,\"strValue\":\"好书推荐\",\"longValue\":0,\"intValue\":0},{\"name\":\"publish_time\",\"type\":1,\"analyzed\":true,\"highlight\":true,\"strValue\":\"1324892396000\",\"longValue\":0,\"intValue\":0},{\"name\":\"name\",\"type\":1,\"analyzed\":true,\"highlight\":true,\"strValue\":\"水浒传\",\"longValue\":0,\"intValue\":0}]}]}";

    /**
     * @param args
     */
    public static void main(String[] args) throws Exception {
        ObjectMapper mapper = new ObjectMapper(); 
        JsonNode jsonNode = mapper.readTree(json); 
        JsonNode jn = jsonNode.get("indexs");
        System.out.println(jn.toString());
    
        Index p = mapper.readValue(json, Index.class); 
        System.out.println(p.getIndexs());
        List<Model> indexs = p.getIndexs();
        for(Model m : indexs) {
            System.out.println(m.getId());
        }
    }
    

    }

    class Index {
    private List indexs;

    public List<Model> getIndexs() {
        return indexs;
    }
    
    public void setIndexs(List<Model> indexs) {
        this.indexs = indexs;
    }
    

    }

    class Model {
    private String id;
    private long createTime;
    private List indexFields;
    public Model() {

    }
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public long getCreateTime() {
        return createTime;
    }
    public void setCreateTime(long createTime) {
        this.createTime = createTime;
    }
    public List<Field> getIndexFields() {
        return indexFields;
    }
    public void setIndexFields(List<Field> indexFields) {
        this.indexFields = indexFields;
    }
    

    }

    class Field {
    private String name;
    private int type;
    private boolean analyzed;
    private boolean highlight;
    private String strValue;
    private long longValue;
    private int intValue;

    public Field() {
    
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getType() {
        return type;
    }
    public void setType(int type) {
        this.type = type;
    }
    public boolean isAnalyzed() {
        return analyzed;
    }
    public void setAnalyzed(boolean analyzed) {
        this.analyzed = analyzed;
    }
    public boolean isHighlight() {
        return highlight;
    }
    public void setHighlight(boolean highlight) {
        this.highlight = highlight;
    }
    public String getStrValue() {
        return strValue;
    }
    public void setStrValue(String strValue) {
        this.strValue = strValue;
    }
    public long getLongValue() {
        return longValue;
    }
    public void setLongValue(long longValue) {
        this.longValue = longValue;
    }
    public int getIntValue() {
        return intValue;
    }
    public void setIntValue(int intValue) {
        this.intValue = intValue;
    }
    

    }
    [/code]

    打赏 评论
  • zyn010101 2013-04-26 17:19

    [code="java"]
    String personstr = getRequest().getParameter("persons");
    JSONArray json = JSONArray.fromObject(personstr);
    List persons = (List)JSONArray.toCollection(json, nvoidPerson.class);

    [/code],[url]http://blog.sina.com.cn/s/blog_5920510a01011vu8.html[/url]

    打赏 评论
  • Dead_Knight 2013-04-26 17:36

    给你写个简单的例子,仅供参考:
    [code="java"]
    import java.util.List;

    import org.codehaus.jackson.JsonNode;
    import org.codehaus.jackson.map.ObjectMapper;
    import org.codehaus.jackson.type.TypeReference;

    public class TestJackson {
    private static String json = "{\"indexs\":[{\"id\":\"6310_2\",\"createTime\":1359424596001,\"indexFields\":[{\"name\":\"keyword_score\",\"type\":1,\"analyzed\":true,\"highlight\":true,\"strValue\":\"2.1781344\",\"longValue\":0,\"intValue\":0},{\"name\":\"object_id\",\"type\":1,\"analyzed\":true,\"highlight\":true,\"strValue\":\"6310\",\"longValue\":0,\"intValue\":0},{\"name\":\"object_type\",\"type\":1,\"analyzed\":true,\"highlight\":true,\"strValue\":\"2\",\"longValue\":0,\"intValue\":0},{\"name\":\"user_id\",\"type\":1,\"analyzed\":true,\"highlight\":true,\"strValue\":\"657\",\"longValue\":0,\"intValue\":0},{\"name\":\"user_name\",\"type\":1,\"analyzed\":true,\"highlight\":true,\"strValue\":\"好书推荐\",\"longValue\":0,\"intValue\":0},{\"name\":\"publish_time\",\"type\":1,\"analyzed\":true,\"highlight\":true,\"strValue\":\"1324892396000\",\"longValue\":0,\"intValue\":0},{\"name\":\"name\",\"type\":1,\"analyzed\":true,\"highlight\":true,\"strValue\":\"水浒传\",\"longValue\":0,\"intValue\":0}]}]}";

    /**
     * @param args
     */
    public static void main(String[] args) throws Exception {
        ObjectMapper mapper = new ObjectMapper(); 
        JsonNode jsonNode = mapper.readTree(json); 
        //JsonNode jn = jsonNode.get("indexs");
        String id = jsonNode.get("indexs").toString(); 
        System.out.println(id);
        //List list =  mapper.readValue(person, new TypeReference<List>() {
        //}); 
        //Person p = mapper.readValue(person,Person.class); 
    }
    

    }
    [/code]

    jackson主要使用下面两段代码完成反序列化话:
    [code="java"]
    ObjectMapper mapper = new ObjectMapper();
    JsonNode jsonNode = mapper.readTree(json); //json为json字符串
    [/code]
    然后通过jsonNode再做相应的处理。如对于对象转换,直接使用
    Person p = mapper.readValue(person,Person.class);

    如果对于List类型,使用:
    [code="java"]
    List list = mapper.readValue(person, new TypeReference() {
    });
    [/code]

    打赏 评论

相关推荐 更多相似问题