详解json string转换为java bean及实例代码

<dependency>  <groupId>org.codehaus.jackson </groupId>  <artifactId>jackson-core-asl</artifactId>  <version>1.9.2</version>  <scope>provided</scope></dependency><dependency>  <groupId>com.alibaba </groupId>  <artifactId>fastjson</artifactId>  <version>1.2.7</version>  <scope>provided</scope></dependency>

package test.fastjson;import java.util.HashMap;import java.util.Map;import org.codehaus.jackson.annotate.JsonIgnoreProperties;import org.codehaus.jackson.annotate.JsonProperty;//简单地忽略掉从JSON（由于在应用中没有完全匹配的POJO）中获得的所有“多余的”属性@JsonIgnoreProperties(ignoreUnknown = true)public class ESMetaDataInfoIndex  {  //改变某个成员属性所使用的JSON名称  @JsonProperty("tableStrategy")  private String tableStrategy = null;  @JsonProperty("indexName")  private String indexName = null;  @JsonProperty("topic")  private String topic = null;  @JsonProperty("nameSpace")  private String nameSpace = null;  @JsonProperty("extendAttr")  private Map<String, String> extendAttr = new HashMap<String, String>();  @JsonProperty("type")  private String type = null;  @JsonProperty("ttl")  private int ttl = 0;  @JsonProperty("splitCol")  private String splitCol = null;  /**  **/  public String getTableStrategy()   {    return tableStrategy;  }  public void setTableStrategy(String tableStrategy)   {    this.tableStrategy = tableStrategy;  }  /**  **/  public String getIndexName()   {    return indexName;  }  public void setIndexName(String indexName)   {    this.indexName = indexName;  }  /**  **/  public String getTopic()   {    return topic;  }  public void setTopic(String topic)   {    this.topic = topic;  }  /**  **/  public String getNameSpace()   {    return nameSpace;  }  public void setNameSpace(String nameSpace)   {    this.nameSpace = nameSpace;  }  /**  **/  public Map<String, String> getExtendAttr()   {    return extendAttr;  }  public void setExtendAttr(Map<String, String> extendAttr)   {    this.extendAttr = extendAttr;  }  /**  **/  public String getType()   {    return type;  }  public void setType(String type)   {    this.type = type;  }  /**  **/  public int getTtl()   {    return ttl;  }  public void setTtl(int ttl)   {    this.ttl = ttl;  }  /**  **/  public String getSplitCol()   {    return splitCol;  }  public void setSplitCol(String splitCol)   {    this.splitCol = splitCol;  }   }

ESMetaDataInfoIndex dataInfo = JSON.parseObject(json.toJSONString(),ESMetaDataInfoIndex .class);