然后将数据转为json字符串，核心函数是：
public static String createJsonString(Object value)
{
String alibabaJson = JSON.toJSONString(value);
return alibabaJson;
}
B、客户端将json字符串转换为相应的javaBean
首先客户端也要导入fastjson的两个jar包
1、客户端获取json字符串
public class HttpUtil
{

public static String getJsonContent(String urlStr)
{
try
{// 获取HttpURLConnection连接对象
URL url = new URL(urlStr);
HttpURLConnection httpConn = (HttpURLConnection) url
.openConnection();
// 设置连接属性
httpConn.setConnectTimeout(3000);
httpConn.setDoInput(true);
httpConn.setRequestMethod("GET");
// 获取相应码
int respCode = httpConn.getResponseCode();
if (respCode == 200)
{
return ConvertStream2Json(httpConn.getInputStream());
}
}
catch (MalformedURLException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
return "";
}


private static String ConvertStream2Json(InputStream inputStream)
{
String jsonStr = "";
// ByteArrayOutputStream相当于内存输出流
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
// 将输入流转移到内存输出流中
try
{
while ((len = inputStream.read(buffer,buffer.length)) != -1)
{
out.write(buffer,len);
}
// 将内存流转换为字符串
jsonStr = new String(out.toByteArray());
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
return jsonStr;
}
}
2、使用泛型获取javaBean （核心函数）
public static T getPerson(String jsonString,Class cls) {
T t = null;
try {
t = JSON.parSEObject(jsonString,cls);
} catch (Exception e) {
// TODO: handle exception
}
return t;
}
public static List getPersons(String jsonString,Class cls) {
List list = new ArrayList();
try {
list = JSON.parseArray(jsonString,cls);
} catch (Exception e) {
}
return list;
}
public static List