Java中使用json与前台Ajax数据交互的方法

时间:2022-06-11 08:40:11

本文主要为大家分享了Ajax获取显示Json数据的一种方法,供大家参考,具体内容如下 
 1、首先前台用Ajax,其中注意dataType一定要选择json方式,Action成功返回给页面的Json内容是这样的[{"number":"V006","names":"LiLei"}],可见comment['names']对应"names":"LiLei",comment['number']对应"number":"V006"。

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$.ajax({
  type: "post",
   url:'apply/mystudent.action?',
  cache: false,
  dataType : "json",
  success: function(data){
   
   $.each(data, function(commentIndex, comment){
         
            alert("姓名"+ comment['names']);
        
            alert("学号"+comment['number']);
 
         });
                 }
                });

2、Ajax的URL指向在java的action中mystudent方法,返回的list其实是一个对象Student,包括了names和nunmber字段

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public String mystudent() throws Exception{
 List list=priceService.query();//调用接口实现类
 
 this.jsonUtil(list);
 
 return null;
 }

3、action页面专门写一个方法jsonUtil来做为json方法 

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// 调用json工具方法,传入参数alist
public void jsonUtil(Object accountlist) throws Exception {
HttpServletResponse response = ServletActionContext.getResponse();
log.info("JSON格式:" + accountlist.toString());
 
String returnJson = JsonConvert.returnJson(accountlist);
response.setCharacterEncoding("utf-8");
response.getWriter().println(returnJson);
}

4、我用的是一种比较新的json包jackson

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import java.io.StringWriter;
 
import org.codehaus.jackson.map.ObjectMapper;
 
public class JsonConvert {
 static String jsonStr;
 public static String returnJson(Object object) throws Exception{
 ObjectMapper objectMapper = new ObjectMapper();
 StringWriter stringWriter = new StringWriter();
 objectMapper.writeValue(stringWriter, object);
 
 jsonStr = stringWriter.toString();
 return jsonStr;
 }
}

以上就是本文的全部内容,希望对大家的学习有所帮助。