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);