String outstr="{\"clientid\":\""+clientid+"\"}"; 

System.out.println("outstr："+outstr); 

out.print(outstr); 


$.ajax({ 

 type : "POST", 

 url : "getclientid.jsp", 

 data : {"send_date":send_date}, 

 cache:false, 

 success : function(data){ 

 var objJson = eval（"(" + data + ")"); //json字符串转换为Object 

 $("#clienid").attr("value",objJson.clientid); 

 }, 

 error : function(){ 

 $("#clienid").attr("value",""); 

 } 

 });