jsonp(json with padding)是资料格式 json 的一种“使用模式”，可以让网页从别的网域获取资料。
一. 客户端
Insert title here Result:
二. 服务器端
import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sf.json.JSONObject;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class ExchangeJsonController {
@RequestMapping("/base/json.do")
public void exchangeJson(HttpServletRequest request,HttpServletResponse response) {
try {
response.setContentType("text/plain");
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
Map map = new HashMap();
map.put("result", "content");
PrintWriter out = response.getWriter();
JSONObject resultJSON = JSONObject.fromObject(map); //根据需要拼装json
String jsonpCallback = request.getParameter("jsonpCallback");//客户端请求参数
out.println(jsonpCallback+"("+resultJSON.toString(1,1)+")");//返回jsonp格式数据
out.flush();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
} 
